48FP,JP,NP
50FB,FP,JB,JP,NB,NP
Single-Package Heating/Cooling Units
With Product Integrated Controls
Controls, Operation,
and Troubleshooting
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Carrier Comfort Network System
Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PIC Rooftop Information . . . . . . . . . . . . . . . . . . . . . . 4
Digital Air Volume (DAV) Linkage . . . . . . . . . . . . . 4
MAJOR CONTROL COMPONENTS . . . . . . . . . . . . 4-8
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
• PROCESSOR MODULE NO . 1 (Standard)
• CONTROL OPTION MODULE
• HIGH-VOLTAGE RELAY MODULES (DSIO1 and
DSIO2)
• KEYPAD AND DISPLAY MODULE (HSIO)
• ECONOMIZER ACTUATORS
• VARIABLE FREQUENCY DRIVES
• INLET GUIDE VANES
• MODULATING POWER EXHAUST
• THERMISTORS AND REFRIGERANT PRESSURE
TRANSDUCERS
• FAN STATUS PRESSURE SWITCH
• CHECK FILTER PRESSURE SWITCH
Optional and Accessory Control
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
• SPACE TEMPERATURE SENSOR (T-55)
• SPACE TEMPERATURE SENSOR (T-56)
• HUMIDITY (RH) SENSORS
• INDOOR AIR QUALITY (CO2) SENSORS
• OUTDOOR AIR VOLUME CONTROL
• HUMIDIFIER DEVICES
• HYDRONIC COIL AND CONTROL VALVE
CONTROLS AND FUNCTIONS . . . . . . . . . . . . . . . 8-33
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Accessing the Control System
(HSIO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
• KEYPAD AND DISPLAY MODULE (HSIO)
• STANDBY/RUN MODE
• SUMMARY DISPLAY
• ACCESSING FUNCTIONS AND SUBFUNCTIONS
• OPERATING MODE DISPLAY
• LOGON AND LOGOFF/PASSWORD
• DATA RESET
• CHANGING DISPLAY FOR METRIC UNITS
Basic System Functions . . . . . . . . . . . . . . . . . . . . . 12
• BASIC SYSTEM
• STANDBY
• SUPPLY FAN
• COOLING
• HEATING
Service Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• ALERTS AND ALARMS
• QUICK TEST
Schedules Group . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
• TIME SCHEDULES
Page
• TIMED DISCRETE OUTPUT
• TIMED OVERRIDE
• OPTIMAL START
• OPTIMAL STOP (CV Units Only)
Economizer and Power Exhaust Group . . . . . . . 20
• ECONOMIZER
• NIGHTTIME FREE COOLING
• MODULATING POWER EXHAUST
Smoke Control Group . . . . . . . . . . . . . . . . . . . . . . . 24
• PRESSURIZATION
• EVACUATION
• SMOKE PURGE
• FIRE SHUTDOWN
Special Ventilation Group . . . . . . . . . . . . . . . . . . . . 25
• INDOOR AIR QUALITY (IAQ)
• IAQ (Pre-Occupancy) PURGE
• OUTDOOR AIR CONTROL (OAC)
• IAQ/OAQ REHEAT
Dehumidification and Humidifier Group . . . . . . 28
• DEHUMIDIFICATION AND REHEAT
• HUMIDIFIER CONTROL
Supply Fan Volume and VAV Control Group . . 29
• SUPPLY FAN VOLUME CONTROL (VAV Only)
• SUPPLY-AIR TEMPERATURE RESET FROM
SPACE TEMPERATURE (VAV Units Only)
• SUPPLY-AIR TEMPERATURE RESET
(External Signal)
Remote Controls Group . . . . . . . . . . . . . . . . . . . . . 30
• REMOTE START
• SPACE TEMPERATURE OFFSET (CV Only)
Special Systems Group . . . . . . . . . . . . . . . . . . . . . 30
• HYDRONIC HEATING
• FREEZESTAT
• LEAD/LAG OPERATION
• HEAD PRESSURE/FAN CYCLING CONTROL
(Motormastert Head Pressure Control)
• TRANSDUCERS AND SUCTION THERMISTORS
Carrier Comfort Network (CCN) Group . . . . . . . 32
• DEMAND LIMIT
• DIGITAL AIR VOLUME (DAV)
INSTALLATION INFORMATION . . . . . . . . . . . . . 34-42
Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Optional Smoke Control . . . . . . . . . . . . . . . . . . . . . 34
Heat Interlock Relay (HIR)
Function Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Remote Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Remote RUN/OCCUPIED Control . . . . . . . . . . . . . 35
Timed Discrete Output . . . . . . . . . . . . . . . . . . . . . . 40
Air Pressure Tubing . . . . . . . . . . . . . . . . . . . . . . . . . 40
Space Temperature Sensors . . . . . . . . . . . . . . . . . 40
Humidity Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
CARRIER COMFORT NETWORK
INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-44
RJ11 Plug Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
PC 111
Catalog No. 564-989
Printed in U.S.A.
Form 48/50F,J,N-1T
Pg 1
6-98
Replaces: 48/50NB,NP-1T
Tab 1a 1b
CONTENTS (cont)
Page
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-56
Initial Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Set Fan Status and Check Filter Switches . . . . 44
• SUPPLY FAN STATUS SWITCH (FS)
• CHECK FILTER SWITCH (CFS)
Auxiliary Switch, Power Exhaust . . . . . . . . . . . . . 45
Adjusting Set Points . . . . . . . . . . . . . . . . . . . . . . . . 46
• SET POINT FUNCTION
Program Time Sequences . . . . . . . . . . . . . . . . . . . 50
• SCHEDULE FUNCTION
Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Operating Sequences . . . . . . . . . . . . . . . . . . . . . . . 51
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . 54
UNIT OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 57-65
Status Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 66-80
Checking Display Codes . . . . . . . . . . . . . . . . . . . . 66
Unit Standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Complete Unit Stoppage . . . . . . . . . . . . . . . . . . . . . 66
Single Circuit Stoppage . . . . . . . . . . . . . . . . . . . . . 67
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Alarm and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
• DIAGNOSTIC ALARM CODES AND
POSSIBLE CAUSES
Thermistor Troubleshooting . . . . . . . . . . . . . . . . . 72
Transducer Troubleshooting . . . . . . . . . . . . . . . . . 75
Refrigerant Pressure Transducer
Replacement and Calibration . . . . . . . . . . . . . . 75
Control Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
• PROCESSOR MODULE (PSIO1), CONTROL
OPTION MODULE (PSIO2), AND HIGH-VOLTAGE
RELAY MODULES (DSIO1 and DSIO2)
• RED LED
• GREEN LED
• PROCESSOR MODULE (PSIO1)
• HIGH-VOLTAGE RELAY MODULES (DSIO1 and 2)
• CONTROL OPTIONS MODULE (PSIO2)
• ACTUATORS
Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Forcing Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80-90
History Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Service Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Test Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91,92
This unit uses a microprocessor-based electronic control system. Do not use jumpers or other tools to short
out components, or to bypass or otherwise depart from
recommended procedures. Any short-to-ground of the
control board or accompanying wiring may destroy the
electronic modules or electrical components.
GENERAL
This Controls and Troubleshooting book includes the following units and sizes:
• 48FP034-074
• 48JP034-064
• 48NP034-074
• 50FB034-074
• 50FP034-074
• 50FPX,FPY034-074 (extended plenum units)
• 50JB034-064
• 50JP034-074
• 50JPX,JPY034-064 (extended plenum units)
• 50NB034-074
• 50NP034-074
All units have Product Integrated Controls (PIC).
Carrier Comfort Network System Architecture
(Fig. 1)
IMPORTANT: This literature contains controls, operation, and troubleshooting data for 48FP,JP,NP and
50FB,FP,JB,JP,NB,NP rooftop units. Use this guide in
conjunction with the separate Installation Instructions
literature packaged with the unit.
These units provide ventilation, cooling, and heating (when
equipped) in Variable Air Volume (VAV) and Constant Volume (CV) applications. The 48FP,JP,NP and 50FB,FP,JB,JP,
NB,NP units contain factory-installed Product Integrated Controls (PIC) which provide full system management. Processor modules (PSIO) store hundreds of configuration settings
and several building schedules. The PSIOs also perform self
diagnostic tests at unit start-up, monitor operation of the unit,
and provide alarms. Information on system operation and status are sent to the central processors by various sensors that
are located at the unit and in the conditioned space. Access
to the unit controls for configuration, set point selection, schedule creation, and service can be done through a unitmounted keypad and display module (HSIO) which is available as an accessory. One HSIO is required for each installation
site. A separate HSIO may be purchased for each unit, or a
single HSIO may be moved and installed on each unit
as required. An HSIO may be unit mounted or remotely
located.
The PIC units can operate either in a stand-alone mode or
they can be interfaced with the Carrier Comfort Network (CCN).
When being installed in network applications, the unit is connected to the CCN communications bus with field-installed
cable.
Other equipment can also be installed on the CCN by fitting the equipment with a Field-Installed Device (FID). A
FID is a UT203 controller. The FID has a standard processor
module (PSIO) but is field-programmed for use with other
HVAC components.
Heating, ventilation and air conditioning (HVAC) and other
building equipment being controlled by PICs or FIDs have
the inherent ability to ‘talk’ on a common communications
bus or network. The configuration of the communications
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can
be hazardous due to system pressures, electrical components; and equipment location (roof, elevated structures, etc.).
Only trained, qualified installers and service mechanics should
install, start up, and service this equipment.
When working on this equipment, observe precautions in
the literature; on tags, stickers, and labels attached to the equipment, and any other safety precautions that apply. Follow all
safety codes. Wear safety glasses and work gloves. Use care
in handling, rigging, and setting this equipment, and in handling all electrical components.
Electrical shock can cause personal injury and death.
Shut off all power to this equipment during installation
and service. There may be more than one disconnect
switch. Tag all disconnect locations to alert others not
to restore power until work is completed.
2
CCN BUS
ROOFTOP
UNIT
ROOFTOP
UNIT
PIC
PIC
BUILDING SUPERVISOR
NETWORK
OPTIONS
ROOFTOP
UNIT
ROOFTOP
UNIT
PIC
PIC
HEATING/COOLING UNITS
REMOTE
CCN SITE
AUTODIAL
GATEWAY
TO
ADDITIONAL
TERMINALS
TERMINAL
SYSTEM
MANAGER
ASI
TCU
ROOFTOP
UNIT
NON CARRIER
HVAC
EQUIPMENT
DAV AIR
TERMINAL
TCU
TCU
DAV AIR
TERMINAL
FID
AIR DISTRIBUTION-DIGITAL AIR VOLUME CONTROL (DAV)
ASI
CCN
DAV
FID
HVAC
PIC
TCU
—
—
—
—
—
—
—
LEGEND
Air Side Interface
Carrier Comfort Network
Digital Air Volume
Field-Installed Device
Heating, Ventilation, and Air Conditioning
Product Integrated Controls
Terminal Control Unit
Fig. 1 — CCN System Architecture
3
DAV FAN
POWERED
MIXING
BOX
using inputs from the TSM for rooftop unit control operation. This is automatic, and does not require a configuration
change to the standard rooftop unit PIC.
bus with 2 or more PIC- or FID-controlled pieces of equipment is referred to as a Carrier Comfort Network (CCN) system. The CCN communications bus conveys commands, data,
and alarms between all elements of the system. Any system
element connected to the bus may communicate with any
other system element, regardless of their physical locations.
The communications bus consists of a field-supplied, shielded,
3-conductor cable connected in daisy-chain fashion. The PICs,
FIDs, and optional network products can be added at any
time to the network.
The main human interface with the CCN system is the
Building Supervisor. The Building Supervisor consists of an
IBM PC compatible computer equipped with Carrier controls software that allows it to connect to the communications bus and ‘talk’ directly with any equipment connected
to the network. An operator working at a Building Supervisor can command, monitor, configure, or modify any portion of the system. More than one Building Supervisor can
be used. The Building Supervisor, in conjunction with optional network products, can generate a wide variety of managerial reports which reflect the operational characteristics of
one or more buildings.
To take further advantage of the network, accessory or
optional control options modules that perform specialized
functions can be added to the communications bus at any
time to enhance the CCN system’s capabilities. Each control
options module consists of a standard hardware module with
special purpose algorithms and communications software that
provide an advanced control function for the entire CCN system or a designated portion of the system. Data collection,
remote communications, demand limiting, and tenant billing are a few examples of the network options available to
give the building owner increased system performance and
superior building management capabilities.
Zoned systems meet the zone temperature control needs
for many commercial applications. These systems utilize a
microelectronic thermostat as a basis for individual zone control and typically build multiple-zone systems with constant
volume (CV) or variable-air volume (VAV) units. Zoned
systems can provide complete control of heating and cooling equipment and zone dampers in many types of HVAC
systems.
MAJOR CONTROL COMPONENTS
General — The control system consists of the following
components (see Fig. 2):
• standard processor module (PSIO 8088 or PSIO1)
• control options module (PSIO 8052 or PSIO2) (option and
accessory)
• two standard high-voltage relay modules (DSIO1 and DSIO2)
• keypad and display module (HSIO) (accessory)
• enthalpy sensor
• thermistors (standard and accessory)
• pressure transducers (standard and accessory)
• accessory humidity sensors
• space temperature sensors (standard T-55 and accessory
T-56)
• supply-air fan status switch
• check filter switch
PROCESSOR MODULE NO. 1 (Standard) — The PSIO1
module contains the factory-loaded software that monitors
and processes the following inputs, outputs, and system
information:
Inputs:
• transducers
• thermistors
• switches
Outputs:
• integrated economizer motor (4 to 20 mA)
• optional variable frequency drive or inlet guide vane
actuator (4 to 20 mA)
• optional modulating power exhaust control
(4 to 20 mA)
• heat stages 1 and 2 operation
The PSIO1 module contains a specially-designed battery that provides power to maintain the module software in the event of unit power failure. DO NOT remove
this battery, or system software will be lost if there is a
unit power failure.
PIC Rooftop Information — The PIC rooftop controls cycle evaporator-fan motor, compressors, and unloaders to maintain the proper temperature conditions. The controls also cycle condenser fans to maintain suitable head
pressure. Safeties are continuously monitored to prevent the
unit from operating under abnormal conditions. The controls provide control of economizer, power exhaust, and inlet guide vane actuators or variable frequency drives, and
cycle or control heating as required.
A scheduling function, programmed by the user, controls
the unit occupied/unoccupied schedule. The controls also allow the service person to operate a ‘quick test’ so that all the
controlled components can be checked for proper operation.
The PIC controls are modular and use a processor module
(PSIO1), 2 relay modules (DSIO1 and DSIO2), a control option module (PSIO2), and an accessory field-installed keypad and display module (HSIO).
System Information:
• generates alert and alarm information (via transducer, thermistor, and sensor inputs)
• supports CCN (Carrier Comfort Network)
communications
• supports digital air volume (DAV) interface
CONTROL OPTIONS MODULE — The PSIO2 module
does not contain software. Through input and output channels on the hardware, it supports the sensors used for:
• suction thermistors
• humidity control
• outdoor-air cfm
• indoor-air quality (IAQ)
• smoke control
• superheat monitoring
In addition, the PSIO2 supplies the outputs (4 to 20 mA
signal) for humidity and hydronic heating coil control, a discrete output for timed clock control (for outdoor building or
parking lot lights), condenser fan staging, and a remote alert
light.
The PSIO2 options module is available as a factoryinstalled option or as a field-installed accessory.
Digital Air Volume (DAV) Linkage — Carrier rooftop units with PIC may also have a communication linkage
with the VAV terminal units in a particular application. This
linkage is called the DAV linkage. In order for this linkage
to be possible, the individual VAV air terminals must be
equipped with Carrier PIC controls and the air terminals must
be linked by a Terminal System Manager (TSM). The TSM
acts as the communication link between the VAV air terminal PICs and the rooftop unit. When the TSM is fully programmed and begins communication, the rooftop control begins
4
CCB
CB
CLO
CR
DSIO
DU
EQUIP
FU
GND
HIR
HR
—
—
—
—
—
—
—
—
—
—
—
Control Circuit Breaker
Circuit Breaker
Compressor Lockout
Control Relay
Module Relay
Dummy Terminal
Equipment
Fuse
Ground Connection
Heat Interlock Relay
Heater Relay
LEGEND
HSIO
IDC
IFCB
MM
NEC
OFC
PL
PRI
PSIO
TB
TRAN
—
—
—
—
—
—
—
—
—
—
—
Keyboard and Display Module
Induced-Draft Contactor
Indoor Fan Circuit Breaker
MotormasterT Device
National Electrical Code
Outdoor-Fan Contactor
Plug Assembly
Primary
Processor Module
Terminal Block
Transformer
Fig. 2 — Major Control Components in Control Box
HIGH-VOLTAGE RELAY MODULES (DSIO1 and DSIO2)
— The DSIO modules close contacts to energize evaporator
and condenser fan contactors. The modules also control compressor contactors, compressor unloaders, compressor crankcase heaters, heat interlock relay, and power exhaust contactor.
Inputs to the DSIO module are the remote start/stop signal,
compressor status (through the compressor lockout [CLO]
relays), and high-pressure switches (safety circuits).
KEYPAD AND DISPLAY MODULE (HSIO) — This device consists of a keypad with 6 function keys, 5 operative
keys, 12 numeric keys, and an alpha-numeric 2 line, 24 character per line display. Key usage is explained in Keypad and
Display Module section on page 9. The HSIO is a fieldinstalled accessory.
ECONOMIZER ACTUATORS — The PIC controls output
a 4 to 20 mA signal to the optional economizer actuator in
the unit to modulate it as required by the control algorithm.
Economizer dampers are spring-return type actuators to
allow automatic closing of the damper on power loss. The
actuators have a maximum rotation of 160 degrees, and contain a series of DIP (dual, in-line package) switches so that
the maximum rotation can be tailored for the damper that is
being controlled.
VARIABLE FREQUENCY DRIVES — If variable frequency drives (VFD) are used for evaporator-fan control, the
PSIO1 output may be used to control the VFD. Either factoryinstalled optional VFDs or field-supplied VFDs may be used.
INLET GUIDE VANES — If the inlet guide vanes (IGV)
option is used for evaporator fan control, the PSIO1 output
is used to control the IGV actuator.
MODULATING POWER EXHAUST — The PIC controls
output a 4 to 20 mA signal to the power exhaust damper
actuator in the unit to modulate the exhaust fan as required
by the control algorithm.
5
Table 1 — Thermistors and Unit Operation Control Pressure Transducers
SENSOR
DPT1*
SPT1*
DPT2*
SPT2*
T1
T2
T3
T4
T5
T6
T7
LOCATION AND FUNCTION
Unit Operation Control Pressure Transducers
Compressor A located at the discharge service valve — Senses discharge pressure
(replaces T3)
Compressor A located at the LPS connection on the compressor instead of LPS1 (lowpressure switch) — Sense suction pressure
Compressor B located at the discharge service valve — Senses discharge pressure
(replaces T4)
Compressor B located at the LPS connection on compressor instead of LPS2 —
Senses suction pressure
Thermistors
Located in supply-air section — Senses supply-air temperature (SAT)
Located in return fan section, right hand side — Senses return-air temperature (RAT)
Located in condenser coil circuit no. 1 at the return bend end (034-048 units); or at the
header end (054-074 units) — Senses saturated condensing temperature (SCT1)
Located in condenser coil circuit no. 2 at the return bend end (034-048 units); or at the
header end (054-074 units) — Senses saturated condensing temperature (SCT2)
Coiled at the corner post (034-048) or below main control box (054-074) — Senses outdoorair temperature (OAT)
Located in compressor A suction service valve — Senses suction gas temperature (SGT1)
Located in compressor B suction service valve — Senses suction gas temperature (SGT2)
PART NO.
HK05ZG002
HH79NZ014†
HH79NZ026**
HH79NZ013
HH79NZ014†
HH79NZ026**
HH79NZ026
*Optional sensors which are included in control option module.
†Unit sizes 034-048.
**Unit sizes 054-074.
INDOOR AIR QUALITY (CO2) SENSORS — The Indoor
Air Quality sensor accessories monitor carbon dioxide levels. This information is used to modify the position of outdoor air dampers to admit more or less outdoor air to dilute
indoor CO2 levels. Two types of sensors are available. The
wall sensor can be used to monitor conditions in the conditioned air space. The duct sensor monitors conditions in
the return air duct. Both wall and duct sensors use infrared
technology. The wall sensor is available with or without an
LCD readout to show CO2 levels in ppm. See Fig. 6.
NOTE: Application also requires the installation of the control options module (PSIO2), available as a factory-installed
option or field-installed accessory.
OUTDOOR AIR VOLUME CONTROL — This feature ensures a continuous supply of outside air to the unit and the
occupied space. The OAC (outdoor air control) monitors the
outside air velocity pressure with a velocity probe and
pressure transducer (included in the accessory package). See
Fig. 7.
NOTE: Application also requires the installation of the control options module (PSIO2), available as a factory-installed
option or field-installed accessory.
HUMIDIFIER DEVICES — The unit control is capable of
controlling two different types of humidifier devices, a 1-step
discrete step humidifier control (via a contact closure) or a
proportional control humidifier control valve (with a 4 to
20 mA signal and an impedance not to exceed 600 ohms).
Humidifier devices must be field-supplied and -installed, for
location in ductwork outside the unit cabinet.
NOTE: Application also requires the installation of the control options module (PSIO2), available as a factory-installed
option or field-installed accessory.
HYDRONIC COIL AND CONTROL VALVE — The unit
control can provide a 4 to 20 mA proportional signal to a
hydronic coil control valve. All hydronic coils and control
valves must be field-supplied and -installed.
NOTE: Application also requires the installation of the control options module (PSIO2), available as a factory-installed
option or field-installed accessory.
THERMISTORS AND REFRIGERANT PRESSURE
TRANSDUCERS — The unit control system gathers information from the sensors to control the operation of the unit.
The units use 5 standard and 2 additional accessory thermistors and up to 4 accessory pressure transducers to monitor various temperatures and pressures at selected points
throughout the system. See Table 1.
FAN STATUS PRESSURE SWITCH — The Fan Status Switch
(FSS) is a snap-acting SPDT switch. The switch senses the
airflow supplied by the unit supply fan and provides the PSIO1
module with a 10-vdc discrete signal for fan status.
CHECK FILTER PRESSURE SWITCH — The Check Filter Switch (CFS) is a snap-acting SPDT switch. When dirty
filter elements cause the pressure drop across the filter section to exceed the switch setting, the switch contacts close
and send a discrete signal (5 vdc) to the PSIO1 module.
Optional and Accessory Control Components
SPACE TEMPERATURE SENSOR (T-55) — The T-55 Space
Temperature Sensor (STS) is shipped inside the units in the
main control box. The sensor is installed on a building interior wall to measure room air temperature. The T-55 also
includes an override button on the front cover, to permit occupants to override the Unoccupied Schedule (if programmed). See Fig. 3.
SPACE TEMPERATURE SENSOR (T-56) (Use with CV Only)
— The T-56 Space Temperature Sensor (a field-installed accessory) may be used on CV installations. This sensor includes a sliding scale on the front cover that permits an occupant to adjust the space temperature set point remotely.
See Fig. 4.
HUMIDITY (RH) SENSORS — The accessory fieldinstalled RH sensors measure relative humidity of the air within
the occupied space, in the return-air ductwork and/or in the
outdoor air hood. The RH sensors provide input signals to
the PSIO2 (control options) module. There are two types of
RH sensors available, wall-mounted or duct-mounted. Humidity sensors require separate and isolated 24-vac power
source(s). See Fig. 5.
NOTE: Application also requires the installation of the control options module (PSIO2), available as a factory-installed
option or field-installed accessory.
6
LEGEND
NEMA — National Electrical Manufacturers’ Association
Fig. 3 — Space Temperature Sensor (T-55)
LEGEND
NEMA — National Electrical Manufacturers’ Association
SENSOR COVER
Fig. 4 — Space Temperature Sensor (T-56)
7
CONTROLS AND FUNCTIONS
The internal logic circuits of the PIC controls consist essentially of seven sets of control loops that provide direction
and control for the major unit systems. These seven major
unit systems are:
• Cooling Stages
• Staged Heating
• Economizer Position
• Building Pressure
• Supply Fan Volume
• Heating Coil (position)
• Humidifier (staged or position)
Each of these unit systems is controlled by a set of logic
loops. Each set consists of a ‘‘Master Loop’’ and a corresponding ‘‘Submaster Loop.’’ Each Master Loop surveys configuration inputs, time schedules, set points, and current operating conditions (via all available sensor inputs). From this
information, each Master Loop will decide which functions
are available within its own system group and which functions should be in operation. Each loop then calculates the
required leaving condition from the unit that will be necessary to satisfy the set points consistent with current occupancy requirements. These required leaving condition values are called ‘‘Submaster Reference Values’’(or SR). Typically
the SR values are updated every two minutes by each Master Loop.
The Submaster Loops in the control system provide specific operating instructions to their specific unit functions.
Each of these Submaster Loops receives a unique SR from
its Master Loop. Each Submaster Loop then surveys its own
control outputs for current status or position, and then generates appropriate changes in its own outputs that will produce the desired operation as determined by its Master Loop.
Submaster Loops recompute their required outputs much more
rapidly than do their Master Loops (typically every two
seconds).
The following sections provide descriptions of the available functions of the unit control system that the users can
select and configure for their own requirements. For each
function, there is a brief description of what the feature is
intended to do for the user, what additional hardware is required to use the feature, an expanded sequence of operation, instructions on configuring the function, and any formulae used by the Master Loop for determining the appropriate
Submaster Reference Values for this algorithm.
Fig. 5 — Space Humidity Sensor (P/N HL39ZZ001)
Fig. 6 — Air Quality (CO2) Sensor
(Wall-Mount Version Shown)
Definitions
ALGORITHM — A series of instructions that translate an
input value into a specific set of output commands that will
modify the operation of the system, until the modified system operation satisfies the required input command value.
DEMAND TERM — Difference between desired position
or value and current position or value. (Control designers
also refer to this as an ‘‘error term.’’)
PID (Proportional Integrated Derivative) — A calculation process that considers the difference between desired condition
(set point) and current condition (actual value), plus the direction of change (increasing or decreasing) and the rate of
change (is the difference between set point and actual condition changing at increasing rate or slowing rate). A PID
process will attempt to reverse a change quickly when needed
or ‘‘soft-land’’ a change that is already approaching its set
point without overshooting the set point.
AIRFLOW
SENSOR
LEG (4 TOTAL)
END VIEW
SIDE VIEW
Fig. 7 — Outdoor Air Control Velocity Probe
8
Table 2 — HSIO Keypad Key Usage
FORCED VALUE — A submaster reference value that overwrites a calculated value from a function master loop or a
real value direct from a sensor. Forced values may be generated by another control function (example: Fire Shutdown) or by service personnel in order to achieve an override or test function.
GAIN — A parameter or correction factor used in a control
loop calculation that adjusts the responsiveness and sensitivity of the control loop.
FUNCTION
KEYS
Status — To display diagnostic codes and current
operating information about the unit.
Quick Test — To check inputs and outputs for
proper operation.
History — To check most recent alarms.
Service — To enter specific unit configuration
information.
Set Point — To enter operating set points and
day/time information.
Schedule — To enter occupied/unoccupied
schedules for unit operation.
Accessing the Control System (HSIO)
KEYPAD AND DISPLAY MODULE (HSIO) — The keypad and display module HSIO (human sensory input/output)
is a field-installed accessory. The HSIO provides unit function information at the unit. See Fig. 8. The module consists
of a keypad with 6 function keys, 5 operative keys, 10 numeric keys (0 through 9). The display is a 2-line, backlit,
alpha-numeric liquid crystal display (LCD). Each line of the
LCD shall display up to 24 characters (with expanded scrolling display capability). The HSIO module contains an RJ-14
data cable connection for simple installation on unit or a remote site. Module is powered by the 24-v control circuit of
the unit. Key usage is explained in Table 2. Each function
has one or more subfunctions as shown in Table 3.
STANDBY/RUN MODE — Unit operation is controlled by
the status of the run/standby mode on the HSIO. To access
the mode, press
on the HSIO keypad, and then
press
. The HSIO will display either STBY YES (unit in
standby mode) or STBY NO (unit in run status).
OPERATIVE
KEYS
CLEAR
Expansion (Press
TUE 12:45
MODE 23
COOL 1
HEAT 1
2 ALARMS
USE
Expand Display — To display a non-abbreviated
expansion of the display.
Clear — To clear the screen and return to
previous display. Also used to enter data value
of zero.
Up Arrow — To return to previous display position.
Down Arrow — To advance to next display
position.
ENTER
To enter data.
NOTE: The
key is not used with these units.
ACCESSING FUNCTIONS AND SUBFUNCTIONS — The
functions and subfunctions are shown in Table 3. See
Table 4 for a procedure on how to access these functions.
OPERATING MODE DISPLAY — The operating mode codes
are displayed to indicate the operating status of the unit at a
given time. To enter the Modes subfunction, press
and
. Use
to determine if more than one mode is in
effect. See Table 5 for a list of the modes and mode names.
LOGON AND LOGOFF/PASSWORD — Password access
is required when entering any subfunction under the SERVICE group. The user configuration inputs are located in the
Service subfunctions. To Log On, enter the password. When
configuration checks and changes are completed, enable the
Data Reset function and then Log off. To logon to the Service function, perform the actions in Table 6.
DATA RESET — Whenever a configuration in the Factory
Configuration group (Service function, Subfunction 3) has
been changed by the user or service person, it is necessary
to enable the Data Reset function before the control will recognize these changes in configuration instructions. To enable Data Reset, enter Data Reset by pressing
. Scroll
down until the HSIO displays the letters DTRS. Press
and ENTER .
SUMMARY DISPLAY — Whenever the keypad has not been
used for 10 minutes, the display will automatically switch to
an alternating summary display. This display has 5 parts, shown
below, which alternate in continuous rotating sequence.
Display
USE
)
TODAY IS TUE, TIME IS 12:45 PM
MODE IS UNOCCUPIED HEAT
COOLING STAGES 1
HEATING STAGES 1
THERE ARE 2 ALARMS
STAT
EXPN
EDIT
1
2
3
SRVC
TEST
ALRM
SET
SCHD
4
5
6
HIST
ALGO
7
-
8
9
CLEAR
DESCRIPTION
ENTER
Enable Data
Reset
0
HOW TO
CONFIGURE
SET
POINT
DTRS
RANGE
Select
, ENTER
CHANGING DISPLAY FOR METRIC UNITS — To change
the display of the HSIO from English to Metric units, enter
Service subfunction 5 by pressing
and
. Scroll down
until the HSIO displays UNITS. Select desired units of
measure. To select Imperial (English), press
and ENTER .
To select Metric, press
and ENTER . See Table 7.
Fig. 8 — Keypad and Display Module
9
Table 3 — HSIO Keypad and Display Module Functions and Subfunctions
SUB
FUNCTION
NO.
Status
History
1
Current
Alarms
Alarms
2
Current
Alerts
Current
Operating
Modes
Capacity
Stages
Maintenance
—
Current
Operating
Set Points
System
Temperatures
System
Pressures
Inputs
Analog
Outputs
Discrete
Outputs
—
—
12
Run/
Standby
—
—
13
—
—
14
—
—
15
—
—
16
—
—
17
—
—
18
—
—
19
20
21
—
—
—
22
—
3
4
5
6
7
8
9
10
11
FUNCTIONS
Schedule
Service
Set Point
Test
Log on and
Log off
System
Set Point
Test of
Inputs
Software
Version
Factory
Configuration
Demand
Limit
Current
Time
Analog
Outputs
Discrete
Outputs
Period 3
(Unit)
Bus Address
Test
Compressors
—
Period 4
(Unit)
Units
of Measure
Daylight
Savings
Time
Configure
Holiday
—
User
Configuration
Heating Coil
—
Exit Test
—
—
Cooling
—
—
Duct Pressure
—
—
Economizer
—
—
Staged Heat
—
—
Nighttime
Free Cool
Adaptive Optimal
Start/Stop
Temperature
Reset
Configure
Loadshed
Configure IAQ
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Configure
Humidity
Building
Pressure
Alert Limits
Service History
Service
Maintenance
Alarm
Override History
—
—
—
—
Period 5
(Unit)
Period 6
(Unit)
Period 7
(Unit)
Period 8
(Unit)
Occupied
Mode 2
Override
(TDO)
Period 1
(TDO)
Period 2
(TDO)
Period 3
(TDO)
Period 4
(TDO)
Period 5
(TDO)
Period 6
(TDO)
Period 7
(TDO)
Period 8
(TDO)
—
—
—
—
—
—
—
—
—
Occupied
Mode
Override
(Unit)
Period 1
(Unit)
Period 2
(Unit)
LEGEND
IAQ — Indoor-Air Quality
TDO — Timed Discrete Output
10
Test Heat
Table 4 — Accessing Functions and Subfunctions
OPERATION
To access a function, press the subfunction number and the function
name key. The display will show the subfunction group.
KEYPAD ENTRY
To move to the other elements, scroll up or down using
the arrow keys.
When the last element in a subfunction has been displayed,
the subfunction group name will be repeated.
To move to the next subfunction, it is not necessary to use the
subfunction number; pressing the function name key will advance
the display through all subfunctions within a function and
then back to the first.
To move to another function, either press the function name key for
the desired function (display will show the first subfunction)
or
Access a particular subfunction by using the subfunction number
and the function name key.
DISPLAY
STAGES
DESCRIPTION
Current stages
COOL X
Cooling stages
CPC X
Cooling percent capacity
HEAT X
Heating stages
HPC X
Heating percent capacity
SMZ X
SUM/Z ratio
STAGES
Current stages
SETPOINT
Current operating set point
TEMPS
System temperatures
PRESSURE
System pressures
INPUTS
System inputs
ANLGOUT
Analog outputs
OUTPUTS
Discrete outputs
STANDBY
ALRMHST
Standby/run mode
Alarm history
MTN/HIS
Maintenance history
Table 5 — Mode Numbers and Names (
MODE NUMBER
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
)
MODE NAME
Supply-Air Temperature Reset (VAV Only)
Demand Limit
Unoccupied Heating
Unoccupied Cooling
Standby
Optimal Start
Unoccupied
Indoor-Air Quality Purge
Optimal Stop
Occupied Heating
Occupied Cooling
Occupied Fan Only
Nighttime Free Cooling
Pressurization
Evacuation
Smoke Purge
Fire Shutdown
Timed Override
Digital Air Volume Control
Quick Test
High Humidity Override
NOTE: Optimal start will initiate both mode 26 (optimal start) and mode 30 (occupied
heating).
Table 6 — Logging On and Off to Service Function
Action
LOG ON
Keypad Entry
LOG ON
Enter
Password
LOGOFF
Confirm
Display
ENTER
LOGGEDON
LOG OFF
ENTER
LOGD OFF
11
Description
Enter password followed by
Logged on okay
Press
ENTER
to log off
Logged off okay
ENTER
Table 7 — Configuring Units of Measure in Display
DESCRIPTION
HOW TO CONFIGURE
Select Units of Measure
SET POINT
UNITS
RANGE
Metric = 1;
English (Imperial) = 0
(equivalent to RUN status) indicates unit control has been
enabled. The unit will operate according to occupancy schedules and function set points. Standby is Mode 25.
NOTE: Units are shipped from the factory in Standby (‘‘STBY
YES’’) mode. Installers must exit Standby to start unit (by
using the HSIO or by using the Remote Start option).
During ‘‘STANDBY YES’’ status, the unit control will stop
all functions. All attempted communication from a CCN network to the unit will be blocked.
During ‘‘STANDBY NO’’ status, the unit control will operate according to occupancy schedules and appropriate set
points for any and all available functions.
Basic System Functions — The unit control system
provides over 35 separate unit system and unit control functions. Descriptions of these functions (including purpose of
the function, necessary additional hardware, configuration,
and operating sequence) have been arranged into 11 separate groups, with each group representing similar topics. These
groups are: Basic Systems, Service, Schedules, Economizer
and Power Exhaust, Smoke Control, Special Ventilation, Dehumidification and Humidifier, Supply Fan Volume and
VAV Control, Remote Controls, Special Systems, and CCN
Applications.
BASIC SYSTEMS — The basic control systems group of
the unit controls include Standby, Supply Fan Interlock and
Operation, Cooling Stage Control, and Staged Heat Control.
System Type — The unit control system is field-configurable
for Variable Air Volume (VAV) or Constant Volume (CV) air
systems. For VAV systems, the control will maintain the unit
supply-air temperature (SAT) at the user configured set point,
with continuous fan operation during Occupied periods. For
CV systems, the control will maintain space temperature at
the user configured space temperature set point during Occupied periods.
To check and modify the configuration, the Service funcENTER to logon to the Service function is used. Press
tion. Enter the password. Press
to enter into the Factory Configuration subfunction. Use
to scroll down to
TYPE. The configuration value will be shown (0 = CV,
1 = VAV). Enter new value if appropriate. Press
and ENTER
for CV operation. Press
and ENTER for VAV operation. If
reconfigured, enable Data Reset. Logoff when completed (unless other Service functions are to be performed).
If configuring unit for Constant Volume operation, the Fan
Operation Type (Continous Fan or Auto Fan) must be configured for use in Occupied time schedules. To configure the
Fan Operation Type, enter the Service function. Logon, if
required. Press
to enter the User Configuration subfunction. Scroll down to Fan Mode (FANM). Select the
desired mode (Continuous = 1, Auto = 0), by pressing
or
and ENTER . Log off when completed.
Heat Type — Heat type is configured at the factory when
factory-installed gas heating or electric heaters are installed.
If there is no heating element, the control will be configured
for No Heat. If field-installed heating will be controlled by
the unit controls, refer to the Hydronic Heating section on
page 30 for information on modifying this configuration value.
To check Heat Type:, log on to the Service function by
pressing
. Enter the password. Press
to enter
the Factory Configuration subfunction. Scroll down to
the Heat Type configuration (HEAT). Check value. A value
of 0 = None, 1 = Water/Steam, 2 = Electric Heat, and
3 = Gas Heat. Press the number
,
,
, or
and
ENTER to reconfigure. If reconfigured, enable Data Reset.
Logout when complete.
STANDBY — Standby is used to disable the unit during installation or service. A unit in Standby mode indicates the
unit control has been disabled, for purposes of shipping and
start-up or for service activity. A unit which is not in Standby
IMPORTANT: There is an exception to the Standby
status. All Smoke Control functions are active at all
times. If any of the fire/smoke modes become active,
the unit will be controlled with a Force Priority 9FIRE9
regardless of RUN/STANDBY/TEST state. Remote Start
input will also override STANDBY OFF status.
Configuration — To enter into Standby mode, press
to enter the Status function and the Standby subENTER to enter standby mode.
function. Press
To exit Standby mode, press
to enter the Status function and the Standby subfunction. A ‘‘1’’ will disENTER to exit
played to show Standby mode is on. Press
standby mode. See Table 8.
SUPPLY FAN — The Supply Fan Operation Type feature
allows user configuration for type of fan operation during
Occupied time periods on CV units. The supply fan control
function provides confirmation of operation of the fan to other
unit functions. The fan status pressure switch is checked and
then status is communicated to other modes (where confirmation of fan operation is required before a function algorithm may initiate other functions). No additional hardware
is required.
Sequence of Operation (VAV) — During Occupied periods,
the control will energize the supply fan contactor. The contactor will close, energizing supply fan motor. The fan wheel
will turn. The airflow switch (differential pressure switch)
contacts close, providing discrete input (DI) to Channel 12
(Closed = Fan ON). Fan operation will continue through the
Occupied period.
During Unoccupied period with demand, the control will
energize the fan contactor when demand is sensed. After fan
status is confirmed, operating routines will commence. When
demand is removed, routines will end and fan will shut off.
Sequence of Operation (CV, Continuous Fan) — During Occupied periods, the control will energize the supply fan contactor. The contactor will close, energizing supply fan motor. The fan wheel will turn. The airflow switch (differential
pressure switch) contacts close, providing discrete input (DI)
to Channel 12 (Closed = Fan ON). Fan operation will continue through the Occupied period.
During Unoccupied period with demand, the control will
energize the fan contactor when demand is sensed. After fan
status is confirmed, operating routines will commence. When
demand is removed, routines will end and fan will shut off.
CLEAR
12
supply fan must be ON for cooling control to operate. The
Master Loop will survey Space Temp and Space Temp Offset inputs, then calculate CCSR value. The CSL surveys actual SAT, then calculates number of capacity stages required
to satisfy space load. Stages of cooling capacity are initiated. (From zero stages, there will be a 1.5 to 3 minute delay
before first stage is initiated.)
Unoccupied Cooling — The Unoccupied Cooling function
is similar to Occupied Cooling except for the following: the
supply fan will be OFF as demand is initiated, the Master
Loop will start Supply Fan and fan status must be proved as
ON, the control set point will be the Unoccupied Cooling set
point (UCSP), and at the end of the cooling cycle, the supply
fan will be turned OFF.
Configure Cooling Set Points — To configure cooling set points,
enter the Set Point function and the Set Point subfunction by pressing
and
. To select the Occupied
Cooling set point, scroll down to OCSP. The current set point
value will be displayed. The default is 78 F. The range of
acceptable values is 55 to 80 F. To change the set point,
press the numbers of the new set point (example:
)
and then press ENTER .
To select the Unoccupied Cooling set point, scroll down
to UCSP. The current set point value will be displayed. The
default is 90 F. The range of acceptable values is 75 to 95 F.
To change the set point, press the numbers of the new set
point (example:
) and then press ENTER .
To select the Supply Air Temperature set point, scroll down
to SASP. The current set point value will be displayed. The
default is 55 F. The range of acceptable values is 45 to 70 F.
To change the set point, press the numbers of the new set
point (example:
) and then press ENTER . See Table 11.
Cooling Algorithms
VAV: CCSR = MSAS = SASP + RESET
CV: CCSR = PID function on (Demand term)
where (Demand term) = OCSP + STO - SPT
Overrides
First Stage and Slow Change Override: — The first stage
override reduces cycling on the first stage of capacity. The
slow change override prevents the addition or subtraction of
another stage of capacity if the SAT is close to the set point
and gradually moving towards the set point.
Low Temperature Override — The low temperature override
function protects against rapid load decreases by removing
a stage every 30 seconds when required, based on temperature and the temperature rate of change.
High Temperature Override — The high temperature override function protects against rapid load increases by adding
a stage once every 60 seconds as required, based on temperature and temperature rate of change.
Sequence of Operation (CV, Automatic Fan) — The fan will
be turned OFF during an Occupied period when there is no
demand for heating or cooling operation. When demand is
sensed, the control will energize fan contactor and fan status
will be confirmed. When demand is removed, routines will
terminate and fan will be shut off.
Configuration —To configure the Fan Operation Type,
enter the Service function. Logon, if required. Press
to enter the User Configuration subfunction. Scroll down to
Fan Mode (FANM). Select the desired mode (Continuous
= 1, Auto = 0), by pressing
or
and ENTER . Log off
when completed. See Table 9.
COOLING — The cooling control loop is used to calculate
the desired supply-air temperature needed to satisfy the space
temperature (CV) or the supply air set point (VAV). The calculated CCSR is then used by the capacity algorithm (cooling submaster loop) to control the required number of cooling stages. See Table 10 for cooling control operation definitions.
Occupied/Unoccupied Cooling Modes
NOTE: Occupied Cooling Mode is 31. Unoccupied Cooling
Mode is 24.
The Cooling Control routine determines the staging of the
available compressors and unloaders to maintain space comfort conditions. Cooling cycle is available during the Occupied period, during Optimal Start routine, and during the
Unoccupied period (if Unoccupied Cooling function has been
enabled). Cooling Control may be overridden by Dehumidification mode (if enabled) when conditions warrant.
For full VAV operation, a T-55 space Temperature sensor
is required (factory-supplied, field-installed). For CV operation, a Space Sensor (T-55 [factory-supplied, field-installed]
or T-56 [field-supplied, field-installed]) is required.
Sequence of Operation, Occupied Cooling (VAV) — The economizer cycle must not be permitted or, if permitted, the outside air damper position must be open to 90% or higher. For
VAV operation the supply fan must be ON for cooling control to operate and the unit must not be in heating mode. The
Master Loop will survey occupancy status, SASP and any
SAT Reset command, then issue CCSR to Cooling Submaster Loop (CSL). The CSL surveys actual SAT, then calculates number of capacity stages required to produce the CCSR
leaving the unit. Stages of cooling capacity are initiated. The
time delay between stages in increasing demand is 90 seconds. As actual SAT approaches CCSR value, stages are released. Minimum time delay between stages on decreasing
demand is 90 seconds.
NOTE: Demand for heating has priority and Master Loop
will either terminate existing or prevent initiation of Cooling Cycle by issuing a CCSR at the maximum limit. This
will cause CSL to select zero stages of cooling capacity.
Sequence of Operation, Occupied Cooling (CV) — The economizer cycle must not be permitted or, if permitted, the outside air damper position must be open to 90% or higher. The
Table 8 — Configuring STANDBY OFF (‘‘Run’’)/STANDBY ON
DESCRIPTION
HOW TO CONFIGURE
SET POINT
RANGE
Select
Exit STANDBY (Place in ‘‘Run’’)
STBY
CLEAR
or
ENTER
Display: STBY NO
Select
, ENTER
Enter STANDBY
STBY
Display: STBY YES
13
,
Table 9 — Configuring Fan Operation (CV)
DESCRIPTION
Select Auto or Continuous Operation
(CV only)
HOW TO CONFIGURE
*If value changed, enable Data Reset before leaving
SET POINT
RANGE
FANM
Auto = 0; Cont = 1*
.
Table 10 — Cooling Control Operation Definitions
ITEM
CCSR
CV
LIMT
MSAS
OCSP
OHSP
PID
DEFINITION
Cooling Control Submaster Reference
Constant Volume
Reset Limit
Modified Supply-Air Set Point
Occupied Cooling Set Point (Space Set Point)
Occupied Heating Set Point (Space Set Point)
Proportional, Integral, Derivative Controls
Supply Air Temperature Reset Value (Based on Space
RESET
Temperature)
RTIO
Reset Ratio
SASP
Supply Air Set Point
SAT
Supply Air Temperature
SATRESET Supply Air Temperature Reset Value (Based on 2 to 10 v Input)
SATRV
Input Voltage to Control Reset (VAV) or Offset (CV)
SPT
Space Temperature
STO
Space Temperature Offset
SUM
Proportional PID Parameter Based on Temperature
VAV
Variable Air Volume
Calculated Integral Limit Based on Temperature
Z
Rise Per Stage
Table 11 — Configuring Cooling (CV/VAV) and Space Temperature Reset (VAV Only)
DESCRIPTION
HOW TO CONFIGURE AT HISO
SET POINT
RANGE
Unit Type
TYPE
CV = 0; VAV = 1*
Supply Air Set Point (VAV only)
SASP
45 to 70 F (7 to 21 C)
Occupied Cooling Set Point
OCSP
55 to 80 F (13 to 27 C)
Unoccupied Cooling Set Point
UCSP
75 to 95 F (24 to 35 C)
Enable Supply Air Reset (VAV only)
RSEN
Enable = 1; Disable = 0
Reset Ratio
RTIO
0 to 10 F (0 to 5.6 C)
Reset Limit
LIMT
0 to 20 F (0 to 11 C)
*If value changed, enable Data Reset before leaving
.
14
HEATING — The Staged Heating Control routine determines the staging of the available heating system to maintain space comfort conditions. The heating cycle is available
during the Occupied period (for all CV units, and for VAV
units when enabled), during Optimal Start/Morning Warm-up
routine, and during the Unoccupied period. A modified Heating function is also available during Dehumidification and
Reheat functions. This function provides control of two stages
of factory-installed gas or electric heat, via channels 17
and 18.
Occupied Heating is Mode 30. Unoccupied Heating is
Mode 23.
On VAV units, Heating control will maintain set point temperature at the Return Air Temperature sensor. On CV units,
Heating Control will prevent the space temperature from falling below the Heating set point. Heating control definitions
are shown in Table 12.
NOTE: On VAV units, VAV terminals must be fully open
during heating operation. The HIR (heat interlock relay) function provides a control signal to the VAV terminals to move
to Heating-Open positions. The HIR is energized whenever
Heating mode is active.
For CV heating operation, a Space sensor (T-55 factorysupplied, field-installed or T-56 field-supplied, field-installed)
is required.
NOTE: If heat type is electric, all compressor stages must be
off before Heating control is permitted.
Gas Heat Units — If the RAT decreases below OHSP, then
the heating cycle will be initiated immediately, even if the
cooling cycle is already operating (cooling stages at one or
higher). The ML will issue a forced value to the Cooling
Submaster Loop (CSL) (at high limit value). This will drive
cooling stages back to zero stages (at minimum time delay
between stages). Simultaneous operation of heating and cooling cycles may be observed during transition. Once OHSP is
satisfied by RAT, heating will terminate and cooling cycle
will restart. The Reheat function will activate Heating control with concurrent operation of compressor stages.
CV Units Occupied Heating —If Auto Fan mode has been
configured, the fan will be OFF when there is no demand for
heating. When space temperature falls below OHSP, the following conditions will occur:
1. If the fan is configured for AUTO, the fan relay will be
energized, and Air Switch contacts will close, confirming
fan operation.
2. The ML compares SPT to OHSP, calculates SHSR value
and issues it to HSL.
3. The HSL compares SHSR to actual SAT, and calculates
number of heating stages required to satisfy space
temperature.
4. The HSL initiates heating stages.
5. Heating stages are deactivated as SPT approaches, then
equals OHSP.
6. If the fan is configured for AUTO, the fan contactor will
be deenergized when SPT equals OHSP and the fan is
deenergized.
Unoccupied Heating (VAV and CV Units) — During unoccupied heating:
1. The fan will be OFF when there is no demand for
heating.
2. Demand is initiated when the RAT falls below UHSP (VAV
units) or when space temperature falls below UHSP (CV
units).
3. The fan contactor will be energized, and Air Switch contacts will close, confirming fan operation.
4. The ML compares RAT (VAV) or SPT (CV) to UHSP,
calculates SHSR value, and issues it to the HSL.
5. The HSL compares SHSR to actual SAT, and then calculates number of heating stages required to satisfy space
temperature.
6. The HSL initiates the heating stages.
7. The heating stages are deactivated as SPT approaches,
then equals UHSP.
8. The fan contactor will deenergize when RAT (VAV) or
SPT (CV) equals UHSP, then the fan stops.
Configuration of Electric Heat — If accessory electric heat
has been installed (50FP,JP only), the control configuration
must be reconfigured for electric heat. See Table 13.
NOTE: Electric heat is not available on 50FB,FPX,FPY,JB,
JPX,JPY,NB,NP units.
Configuration of Heating Set Points — To configure heating set points, enter the Set Point function and the Set
Point subfunction by pressing
and
. To select the
Occupied Heating set point, scroll down to OHSP. The current set point value will be displayed. The default is
68 F. The range of acceptable values is 55 to 80 F. To change
the set point, press the numbers of the new set point
(example:
) and then press ENTER .
Table 12 — Heating Control
Operation Definitions
ITEM
CV
HD
HS
HSR
OAT
OHEN
OHSP
PID
RAT
SATRV
SHSMG
SHSR
SPT
STO
UHSP
VAV
DEFINITION
Constant Volume
Heat Demand (Degrees F for Staged Heat and
Percent for Modulating)
Heating Stages
Heating Submaster Reference
Outdoor Air Temperature
Occupied Heat Enable/Disable
Occupied Heating Set Point (Space Set Point)
Proportional, Integral, Derivative Controls
Return-Air Temperature
STO Reset Value (Based on 2 to 10 v Input)
Staged Heating Submaster Gain
Staged Heating Submaster Reference
Space Temperature
Space Temperature Offset (CV Only)
Unoccupied Heating Set Point
Variable Air Volume
VAV Units Occupied Heating — Occupied Heat must be enabled for Heating control to operate during Occupied periods. The supply fan must be ON before Heating control can
start. Fan Status is determined by closure of contacts at Fan
Status switch. The RAT must be less than Occupied Heat Set
point. The Master Loop (ML) checks the RAT and OHSP,
and then issues a Heating Submaster Reference value (SHSR)
to the Heating Submaster Loop (HSL). The HSL compares
SHSR to actual SAT, then calculates number of heating stages
required to deliver the SHSR. Heating stages are initiated.
Heat Interlock Relays are energized, initiating signal to room
terminals to move to heating position. As RAT approaches
OHSP, the HSL will deactivate stages of heating.
15
To select the Unoccupied Heating set point, scroll down
to UHSP. The current set point value will be displayed. The
default is 55 F. The range of acceptable values is 40 to 80 F.
To change the set point, press the numbers of the new set
point (example:
) and then press ENTER .
To enable Occupied Heating (VAV units) press
.
Enter the password. Press
to enter into the User Configuration subfunction. Scroll down to OHEN (Occupied Heating Enable). The current configuration will be displayed
(0 = disabled, 1 = enabled). The default is disabled. To change
the configuration, press the number of the new configuration
(example:
) and then press ENTER . See Table 13.
Heating Algorithms — SRV Formula:
SHSR = PID function on (Demand term)
To view Alerts, press
. Scroll for active alerts.
Configuration — To configure Alert set points, press
to enter the Alert Limits subfunction. Scroll to
the desired alert. Enter new value. See Table 14 for default
values and available ranges. See Table 15 for alert reset
criteria.
Alarms — Alarms are initiated by the unit control when it
detects that a sensor input value is outside its valid range
(indicating a defective device or connection that prevents full
unit operation), that an output has not functioned as expected, or that a safety device has tripped. Current (still active) alarms are maintained in the Status function (subfunction 1). Up to 9 of the last (current and reset) alarms are
stored in the History function.
Alarms are also broadcast to the CCN Building Supervisor. There are 40 separate Alarms possible from the unit controls. For a detailed explanation of each alarm, refer to the
Troubleshooting section.
where
VAV: (Demand term)
= Heating set point − Return-Air Temperature
CV: (Demand term)
= Heating set point − Space Temperature
QUICK TEST — The Quick Test mode permits service technician to initiate a test of all inputs and outputs from the unit
control system. The test, initiated and controlled from the
HSIO, forces all outputs with a service priority. All service
priorities are removed on exit from the Quick Test. Quick
Test is Mode 40. An accessory HSIO module must be connected to the unit to initiate quick test.
Sequence of Operation
1. Place unit in Standby mode (displays STBY YES).
2. Enter desired TEST subfunction.
3. Scroll down to desired test.
4. Press ENTER to initiate test.
5. Input test will display the current sensor input value (if
analog-type) or contact status (if discrete-type).
6. Individual Output tests will cause discrete outputs to be
enabled, or will cause analog outputs to be cycled to specific output values. Each output will be disabled by selecting next output using the
or
keys. To enable
an output test, press ENTER .
Service Group — This group includes Alerts and Alarms,
and Quick Test.
ALERTS AND ALARMS — Alerts and alarms are features
of the unit controls that facilitate diagnostics and troubleshooting activity.
Alerts — Alerts are initiated by the unit control when it detects that a sensor condition has gone outside user-configured
criteria for aeceptable range. Alerts are available for:
• Space Temperature/Occupied
• Space Temperature/Unoccupied
• Supply-Air Temperature
• Return-Air Temperature
• Outdoor-Air Temperature
• Relative Humidity
• Outdoor Air Relative Humidity
• Static Pressure
• Building Pressure
• Outdoor Air CFM
• Indoor Air Quality/Service Maintenance (accrued run time
since last service call)
7. Exiting TEST will remove all previously applied forces.
Table 13 — Configuring Heating (VAV/CV)
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
RANGE
Electric = 2*
Gas = 3
Hydronic = 1
None = 0
Type of Heat
HEAT
Enable Occupied Heating (VAV only)
OHEN
Enable = 1; Disable = 0
Occupied Heating Set Point
OHSP
55 to 80 F (13 to 27 C)
Unoccupied Heating Set Point
UHSP
40 to 80 F (4 to 27 C)
*If value changed, enable Data Reset before leaving
.
NOTE: Occupied Heating Set Point serves as ‘‘Morning Warm-Up Set Point.’’
16
Table 14 — Sensor Set Point Alert Limits and Default Values
NAME
DESCRIPTION
SUBFUNCTION
OCCUPIED
SPACE STATUS
ALERT
DEFAULT
(LOW)
ALERT
DEFAULT
(HIGH)
LOW
LIMIT
HIGH
LIMIT
Occupied
20.25 in.
wg
0.25 in.
wg
-0.5 in.
wg
0.5 in.
wg
Occupied
0 ppm
800 ppm
0 ppm
5000 ppm
Occupied
0 cfm
50,000
cfm
0 cfm
50,000
cfm
Building
pressure
Pressure
IAQ
Indoor-Air
Quality
Inputs
OAC
Outdoor-Air
Cfm
Inputs
OARH
Outdoor-Air
Relative
Humidity
Inputs
Occupied/
Unoccupied
0%
100%
0%
100%
OAT
Outdoor-Air
Temp
Occupied/
Unoccupied
240 F
125 F
240 F
245 F
Temps
Return-Air
Temp
Occupied
60 F
90 F
240 F
245 F
Temps
Unoccupied
35 F
120 F
240 F
245 F
RH*
Relative
Humidity
Inputs
Occupied/
Unoccupied
0%
100%
0%
100%
SAT*
Supply-Air
Temp
Occupied
45 F
180 F
240 F
245 F
SP*
Static
Pressure
BP
RAT*
SPT*
Temps
Unoccupied
35 F
180 F
240 F
245 F
Pressure
Occupied/
Unoccupied
0.0 in.
wg
2.0 in.
wg
0.0 in.
wg
5.0 in.
wg
Occupied
65 F
80 F
210 F
245 F
Unoccupied
45 F
100 F
210 F
245 F
Space
Temperature
Temps
LEGEND
ppm — parts per million
*Once the unit changes from Unoccupied to Occupied mode, a programmed delay of 30 minutes takes place before any alert will be generated.
Table 15 — Alert Criteria Reset Value for
Return to Normal
NAME
BP
IAQ
OAC
OARH
OAT
RAT
RH
SAT
SP
SPT
DESCRIPTION
Actual Space Pressure
Indoor-Air Quality
Constant Outdoor-Air Cfm
Outdoor-Air Relative Humidity
Outdoor-Air Temperature
Return-Air Temperature
Space Relative Humidity
Supply-Air Temperature
Static Pressure
Space Temperature
17
CONSTANT VALUE
None
None
None
2%
1F
1F
2%
2F
0.2 in. wg
1F
To Set Daylight Savings Time and Set Occupancy Schedules, Schedule I, see the Program Time Sequences on
page 50. See Table 16.
Configuration — To configure:
1. Connect control wires from external controlled device at
PSIO2 Channel 44 (terminals J6/41 and J6/42).
2. Enter Time Schedules. Press
. (See Schedule
Function section on page 50 for detailed instructions.)
Define Period 1 (Occupied, Unoccupied). Define Periods
2 thru 8 (as required).
TIMED OVERRIDE — The Timed Override mode allows
an occupant to return a system that is in Unoccupied status
to Occupied status, for period of 1 to 4 hours (user-configured).
Timed Override is Mode 38. The Timed Override function
can be user-configured to return only the unit, the Timed Discrete Output, or both to Occupied status. A T-55 space sensor (factory-supplied, field-installed) or T-56 space sensor
(field-supplied and -installed) is required.
To activate Timed Override, press the button on face of
the space sensor. The unit control will recognize this signal
and enable the Occupancy Schedule program to extend the
Occupied period by the configured timed override amount.
To configure Timed Override, perform the following
procedure:
Select which Time Schedules permit the use of override.
Press
to enter into the Service function. Enter the
password. Press
to enter into the User Configuration
subfunction. Scroll down to TSCH. The current schedule configuration will be displayed. A 1 represents Unit schedule
only (Time Schedule I). A 2 represents Timed Discrete Output only (Time Schedule II). A 3 represents both Schedules
I and II. Press the number of the desired configuration and
press ENTER .
Configure the duration for Timed Override (Schedule I).
Press
to enter in to the Service function and the Override subfunction. Scroll down to TOVR. The number of override hours will be displayed. The default is 1 hour. The range
is 1 to 4 hours. To change the configuration, press a new
number (example:
) and ENTER .
One-time Period Override — As an alternate way to initiate
override, a service technician may initiate Timed Override
from the HSIO, for a one-time period.
TIMED DISCRETE OUTPUT — The unit control can be
programmed with a unique time schedule (separate and different from the unit Occupied/Unoccupied schedule) that may
be used to control an external function or device (such as
parking lot lights) without adding a discrete timeclock device. This schedule is designated as ‘‘Schedule II.’’
A special relay (P/N HK35AB001) with a 20 vdc coil is
required.
Sequence of Operation — From Schedule II, when time schedule indicates Unoccupied time, the control output is off. When
time schedule indicates Occupied time, control output is on
(relay energized).
To initiate an override for Schedule I, press
to enter into the Schedule function. Scroll down to OVRD. The
current override time will read 0. Press the number of the
desired override time and press ENTER . The acceptable range
of values is 0 to 4 hours. At end of this time override event,
the entered OVRD values will be reset to zero.
To initiate an override for Schedule II, press
to enter into the Schedule function. Scroll down to OVRD.
The current override time will read 0. Press the number of
the desired override time and press ENTER . The acceptable range
of values is 0 to 4 hours. At end of this time override event,
the entered OVRD values will be reset to zero.
Schedules Group — This group includes Schedule I
and II, Timed Discrete Output, Timed Override, Adaptive
Optimal Start, and Adaptive Optimal Stop (available on CV
units only).
TIME SCHEDULES — Time Schedule function provides
two separate schedules from the unit controls. Schedule I is
provided for unit operation as a means to automatically switch
back and forth from Unoccupied to Occupied modes. Schedule II provides a means to automatically change the Discrete
Device Output (for control of outdoor building or parking
lot lights).
Each schedule consists of 1 to 8 occupied time periods
that are set by the user through the function on the HSIO.
NOTE: A control relay for external device control (see Timed
Discrete Output) is required for Schedule II.
Sequence of Operation
Schedule I — When the schedule changes from Unoccupied
to Occupied modes (or vice versa), the Master Loops will
change their priorities and control the submaster reference
values according to user configuration instructions for unit
Unoccupied or Occupied mode.
Schedule II — See the Timed Discrete Output section below.
Configuration — To configure Time Schedule set points, enter the Set Point function and the Date and Time subfunction by pressing
and
. To set the Day of the Week
and Time, scroll down to DOW. The current day, hour, and
minute will be displayed (where 1= Monday, 2 = Tuesday,
and so on). To change the day and time, press the numbers
of the new set point (example:
would be Monday, 2:30 PM) and then press ENTER .
To set the Month, Day, and Year, scroll down to
MDY. The current month, day, and year will be displayed
(mm.dd.yy). To change the month, day, and year, press the
numbers of the new set point (example:
which would be May 14, 1998) and then press ENTER .
Table 16 — Configuring Day of Week/Time of Day
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
RANGE
Set Day of Week
DOW
Monday = 1; Tuesday = 2; etc.
Set Time of Day
TIME
hh.mm (military time)
(use
for ‘‘:’’)
Set Daylight Savings Time
Set Occupancy Schedules
(see Table 46)
(see Table 47)
18
OPTIMAL STOP (CV Units Only) — The control will compute a time period prior to end of the current Occupied period, then allow space temperature to drift up/down to the
Expanded Occupied Set Point by end of scheduled Occupied period. Optimal Stop is mode 29.
The control will calculate a bias time (in minutes) that
will be subtracted from end-of-Occupied time. The control
will allow the space temperature set point value to be adjusted by the Set Point Bias and then adjust required stages
of capacity to permit drift in space temperature.
Configuration — To enable Optimal Stop, press
to
enter into the Service function. Enter the password. Press
to enter into the User Configuration subfunction.
Scroll down to OSEN. The current configuration will be shown.
ENTER to enable the
The default is 0 (disabled). Press
Optimal Stop. The acceptable range of values is 0 and 1,
where 0 is disabled and 1 is enabled.
When Optimal Stop is enabled, 3 other set points should
be configured to allow Optimal Stop to work correctly. They
are Building Factor, 24-hr Unoccupied Factor, and Set Point
Bias.
To set the Building Factor, press
to enter into the
Service function. Enter the password. Press
to
enter into the AOSS (Adaptive Optimal Start/Stop) subfunction. Scroll down to BLDF. The current set point will be shown.
The default is 10%. The acceptable range of values is 1 to
100%. To change the set point, enter the new number
(example:
) and press ENTER .
To set the 24-Hr Unoccupied Factor, press
to enter into the Service function. Enter the password. Press
to enter into the AOSS (Adaptive Optimal Start/
Stop) subfunction. Scroll down to UOCF. The current set
point will be shown. The default is 15%. The acceptable range
of values is 0 to 99%. To change the set point, enter the new
number (example
) and press ENTER .
OPTIMAL START — The control will compute a time period (in minutes) to start Occupied Mode Warm-up prior to
start of the Occupied Mode schedule, to arrive at Occupied
set points just as Occupied period begins. Optimal Start is
mode 26.
Optimal Start is allowed only if the RAT is less than
Occupied Heating Set point (VAV units), or if the space temperature is less than the Occupied Heating Set Point
(CV units). The control checks the return air/space temperature, the time for start of Occupied period (day, hr), and the
time for last Unoccupied period (day, hr). The control computes a biased start time period to meet the needs of the Optimal Start. The control initiates the Occupied Heating function at the calculated time. The fan is energized and heating
starts. If Warm-Up function is still required as Time Schedule changes to Occupied period, Warm-up Heating will continue until OHSP is satisfied (even in VAV system which has
NOT been configured for Occupied Heating).
Configuration — To enable Optimal Start, press
to
enter into the Service function. Enter the password. Press
to enter into the User Configuration subfunction. Scroll
down to OSEN. The current configuration will be shown.
ENTER to enable the OpThe default is 0 (disabled). Press
timal Start. The acceptable range of values is 0 and 1, where
0 is disabled and 1 is enabled.
When Optimal Start is enabled, 3 other set points should
be configured to allow Optimal Start to work correctly. They
are Building Factor, 24-hr Unoccupied Factor, and Set Point
Bias.
To set the Building Factor, press
to enter into the
Service function. Enter the password. Press
to
enter into the AOSS (Adaptive Optimal Start/Stop) subfunction. Scroll down to BLDF. The current set point will be shown.
The default is 10%. The acceptable range of values is 1 to
100%. To change the set point, enter the new number
(example:
) and press ENTER .
To set the 24-Hr Unoccupied Factor, press
to enter into the Service function. Enter the password. Press
to enter into the AOSS (Adaptive Optimal Start/
Stop) subfunction. Scroll down to UOCF. The current set
point will be shown. The default is 15%. The acceptable range
of values is 0 to 99%. To change the set point, enter the new
number (example:
) and press ENTER .
To set the Set Point Bias, press
to enter into the
Service function. Enter the password. Press
to
enter into the AOSS (Adaptive Optimal Start/Stop) subfunction. Scroll down to SETB. The current set point bias will be
shown. The default is 2 F. The acceptable range of values is
1 to 10 F. To change the set point, enter the new number
(example:
) and press ENTER . See Table 17.
To set the Set Point Bias, press
to enter into the
Service function. Enter the password. Press
to
enter into the AOSS (Adaptive Optimal Start/Stop) subfunction. Scroll down to SETB. The current set point bias will be
shown. The default is 2 F. The acceptable range of values is
1 to 10 F. To change the set point, enter the new number
(example
) and press ENTER . See Table 17.
An optional Maximum Allowable Stop Time function is
available. Service Tool or CCN Building Supervisor is required to change this parameter. The set point name is OSMT.
The default is 60 minutes. The range is 10 to 120 minutes.
The Maximum Allowable Stop Time will limit how long Optimal Stop can be active.
Table 17 — Configuring Adaptive Optimal Start-Stop (AOSS) (Stop available only on CV)
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
RANGE
Enable AOSS
OSEN
Enable = 1; Disable = 0
Set Building Factor
BLDF
1 to 100%
Set 24-Hr Unoccupied Factor
UOCF
0 to 99%
Select Set Point Bias
SETB
1 to 10 F (.6 to 5.6 C)
19
Economizer operation is permitted if all of the following
conditions exist:
• System is NOT in Heating mode
• Outdoor air enthalpy (via switch or humidity differential) is acceptable
• Outside air temperature is less than Space Temperature
If economizer operation is permitted, Master Loop checks
for Cooling System operation. If cooling is ON, the economizer Submaster Reference (ECONSR) will be set to the minimum position. The Economizer Submaster Loop (ESL) responds by driving outside air dampers to maximum position.
If Cooling is not on, in VAV operation, the Master Loop
calculates DPSP, compares it to SASP, computes ECONSR,
and outputs the value to the ESL. If Cooling is not on, in CV
operation, the Master Loop calculates the DPSP, compares it
to the Space Temperature set point (SPT), computes ECONSR,
and outputs the value to the ESL. The ESL will compare
ECONSR to the actual supply air temperature, compute the
required damper position to satisfy ECONSR, and output the
position requirement (at channel 13 and 14) to economizer
motors. Damper motors will open Outside Air dampers (and
close Return Air dampers) and modulate to maintain supply
air temperature at DPSP.
If economizer operation is NOT permitted, the ECONSR
will be set to maximum value. The ESL will respond by driving outside air dampers to minimum position (Occupied period) or closed position (Unoccupied period).
For VAV units, economizer operation is also not permitted when Occupied Heating is enabled and Return Air
Temperature is less than (OHSP + 1).
Economizer Configuration — To configure the economizer,
press
to login. Enter the password. Press
to enter the Economizer subfunction of the
Service function. Scroll down to Minimum Damper Position
(MDP). The default is 20%. The range of acceptable values
is 0 to 100%. To change the set point, enter the new number
(example:
) and press ENTER . See Table 19.
Economizer Algorithms — See Table 18 for economizer operation definitions.
SRV Formula:
ECONSR = PID function on (Demand term)
where
VAV: (Demand term) = DPSP − SAT
DPSP = SASP
CV: (Demand term) = DPSP − Space Temp Set Point
DPSP = (see chart below)
Economizer and Power Exhaust Group — This
group includes Economizer, Nighttime Free Cooling, and Modulating Power Exhaust.
ECONOMIZER — Economizer control is used to control
the outside and return air dampers of the unit, to satisfy space
cooling demand using all outside air (when permitted), and
to satisfy cooling in conjunction with compressor operation
(when conditions permit). During Occupied periods, the outside air dampers will be at the user-configured Minimum
Damper Position. During Unoccupied periods, the outside
air dampers will be closed. The Economizer function is also
used for Indoor Air Quality (IAQ), Outdoor Air Control (OAC),
and Building Pressurization modes. See Table 18. Economizer is available as a factory-installed option only.
The user can install the following devices to enhance economizer control:
• Outside air humidity sensor (field-supplied and -installed)
• Return air humidity sensor (field-supplied and -installed)
• Freeze-stat (field-supplied and -installed)
Table 18 — Economizer Operation Definitions
ITEM
CV
DPSP
NTLO
OAT
OCSP
OHSP
SASP
SAT
SRV
VAV
DEFINITION
Constant Volume
Damper Position Set Point
Unoccupied Free Cooling Lockout
Outdoor-Air Temperature
Occupied Cooling Set Point
Occupied Heating Set Point
Supply Air Set Point Temperature, VAV Only
Supply-Air Temperature
Submaster Reference Value
Variable Air Volume
Enthalpy Control — Outside air enthalpy control is standard
with factory-installed economizer option. Enthalpy is sensed
by a controller located behind the end outside air hood. Access the controller by removing the upper hood filter. See
Fig. 9.
The outdoor enthalpy controller permits selection of four
different enthalpy settings, reflecting different temperaturehumidity ranges. See Fig. 10 for available ranges. Adjust setting on the enthalpy controller (see Fig. 11).
NOTE: Replace the outside air filter before restarting the unit.
Differential Enthalpy Sensing — Added efficiencies in economizer control can be gained by installing a differential enthalpy sensor in the return air duct. When differential enthalpy
control is connected, the economizer control will use the air
stream with the lower enthalpy (outside air or return air) to
provide for lower compressor operating costs during integrated economizer cycle operation. Install the differential enthalpy sensor (Carrier Part Number HC57AC078) in the return duct and wire per Fig. 12.
Sequence of Operation — The Master Loop will be delayed
2 minutes after the supply fan is turned ON, to allow all system statuses and temperatures to stabilize before starting control. When coming out of Standby or Heating mode, a 4-minute
delay will occur before the economizer damper is controlled. During this delay, damper position is limited to closed
or minimum position (depending on current unit occupancy
status).
If the fan status is OFF, the outside air dampers will remain closed (return air dampers will be open).
If fan status is ON, the Master Loop will check for forced
status on the Damper Position Set Point (DPSP). If a forced
condition exists, the sequence is terminated.
DPSP Determination (CV):
Zone A
|
Zone B
|
Zone C
<-----------------------|---------------------|----------------------->
Decreasing
NTLO
68 F
Increasing
Outside Air Temp
Zone A: OAT < NTLO
Control assumes heating is required.
DPSP = OCSP − 1
Outside air damper position will be mostly closed.
Zone B: NTLO < OAT < 68 F
DPSP = (OCSP + OHSP)/2
Zone C: OAT > 68 F
Control assumes cooling is required.
DPSP = OHSP + 1
Outside air damper position will be mostly open.
NOTE: For more information on NTLO, refer to Nighttime
Free Cooling section on page 22.
20
O
ENTHALPY
CONTROLLER
ENTHALPY
SETTING
DIAL
Fig. 9 — Enthalpy Controller Location
Fig. 11 — Enthalpy Controller
A
B
TR
C
D SO
TR1
SR
+
2
+
24 VAC SUPPLY FROM
ECONOMIZER CONTROL
SECTION (RED TO TR,
BRN TO TR1)
TO SENSOR MOUNTED
ON BACK OF CONTROL
S (HH57AC078
+ SENSOR)
3
1
GRAY WIRE FROM
ECONOMIZER HARNESS
LED
RED WIRE FROM
ECONOMIZER SWITCH 3
(NORMALLY CLOSED)
NOTES:
1. Remove factory-installed jumper across SR and + before connecting wires from HH57AC078 sensor.
2. Switches shown in high outdoor air enthalpy state. Terminals 2
and 3 close on low outdoor air enthalpy relative to indoor air
enthalpy.
Fig. 12 — Wiring Connections for Differential
Enthalpy Control (HH57AC077 and HH57AC078)
CONTROL
CURVE
A
B
C
D
CONTROL POINT
(approx Deg) AT 50% RH
73
68
63
58
Fig. 10 — Psychrometric Chart for
Enthalpy Control
Table 19 — Configuring Economizer
DESCRIPTION
HOW TO CONFIGURE AT HSIO
Configure Economizer
Specify Minimum Damper Position
*If value changed, enable Data Reset before leaving
SET POINT
RANGE
ECON
Air = 1; None = 0*
MDP
.
21
0 to 100%
NIGHTTIME FREE COOLING (NTFC) — Nighttime Free
Cooling will start the supply fan on cool nights to pre-cool
the structure mass by using only outside air. Nighttime Free
Cooling is mode 33. See Table 20.
Nighttime Free Cooling is not permitted if the system is
already in Unoccupied Heating mode, Unoccupied Cooling
mode, or Optimal Start mode; or if space temperature reading or outside-air temperature readings are not available.
Nighttime Free Cooling is permitted if the mode is Unoccupied, if the OAT > NTLO, the time is between 3 A.M.
and 7 A.M., and if the outdoor enthalpy conditions are suitable. Nighttime Free Cooling is initiated when:
Space Temperature > (NTSP + 2 F)
AND
Space Temperature > (Outside Air Temperature + 8 F)
where the NTSP is
NTSP = OCSP (VAV Units)
NTSP = (OCSP + OHSP)/2 (CV Units)
When Nighttime Free Cooling is initiated, the economizer dampers drive full open. The supply fan runs until the
space temperature drops below NTSP or space temperature
drops below (OAT + 3 F). When the conditions are met, the
economizer dampers close and the fan shuts off.
range of values is 40 to 70 F. To change the set point, enter
the new number (example:
) and press ENTER . See
Table 21.
MODULATING POWER EXHAUST — Building pressure
control is used to modulate the Power Exhaust function to
maintain a building static pressure set point. The factoryinstalled economizer option, factory-installed modulating power
exhaust option, and field-provided and installed tubing and
space pressure pickup are required.
The supply fan must be on for the power exhaust fan routine to operate. See Table 22 for fan operation definitions.
Sequence of Operation — If the PWRX is set at ‘modulating,’ the following logic applies when the evaporator fan is
turned on:
Fan no. 1 is equipped with a variable position discharge
damper located in the outlet of the fan housing. This damper
is controlled by an actuator (PEDM), based on signals from
the Building Pressure Differential Pressure Submaster Loop
(PSIO-1, Channel 15). Building pressure is sensed by a pick
up (field-supplied and -installed) located in the occupied space.
Operation of the Modulating Power Exhaust is a combination modulating/staged control, with fan no. 1 providing
modulating control from 0 to 100%, and fan no. 2 being staged
On/Off according to damper position on fan no. 1.
If building pressure is greater than BPSP, PSIO-1,
Channel 28 energizes fan contactor PEC1. Fan motor no. 1
starts and runs.
Capacity of fan no. 1 is controlled by the position of the
outlet damper. As building pressure increases above set point,
the control output from PSIO-1, Channel 15 drives the power
exhaust damper motor (PEDM) open until set point is achieved.
When space demand moves PEDM to 90% of full-open
position, auxiliary switch PEDM2 closes, energizing fan contactor PEC2 and auxiliary control relay PER. Fan motor
no. 2 starts and runs. Increased exhaust airflow will lower
space pressure, causing DPS to drive PEDM back toward its
closed position, until the set point is achieved.
If space pressure decreases until PEDM position is reduced to 10% of open position, PEDM2 will open, deenergizing fan contactor PEC2 and auxiliary control relay PER,
and shutting off fan no. 2.
If BP is less than BPSP − BPSO for 4 to 6 minutes, with
the power exhaust damper at minimum position, the exhaust
fan will be turned off and the BPSR will be set to its minimum value. See Table 23.
NOTE: Power exhaust has a 2-minute minimum off-time to
minimize cycling.
Table 20 — Unoccupied Free Cooling Definitions
ITEM
NTEN
NTLO
NTSP
OAT
OCSP
OHSP
DEFINITION
Nighttime Free Cooling Enable/Disable
Nighttime Free Cooling Lockout Temperature
Nighttime Free Cooling Set Point
Outdoor-Air Temperature
Occupied Cooling Set Point
Occupied Heating Set Point
Configuration — To enable Nighttime Free Cooling, press
to enter into the Service function. Enter the password. Press
to enter into the User Configuration
subfunction. Scroll down to NTEN. The current configuraENTER
tion will be shown. The default is 0 (disabled). Press
to enable the Nighttime Free Cooling. The acceptable range
of values is 0 and 1, where 0 is disabled and 1 is enabled.
To set the Lockout Temperature, press
to enter
into the Service function. Enter the password. Press
to enter into the NTFC (Nighttime Free Cooling) subfunction. Scroll down to NTLO. The current lockout temperature will be shown. The default is 50 F. The acceptable
Table 21 — Configuring Nighttime Free Cooling (NTFC)
SET POINT
RANGE
Enable NTFC
DESCRIPTION
HOW TO CONFIGURE AT HSIO
NTEN
Enable = 1; Disable = 0
Select Lockout Temperature
NTOL
40 to 70 F (4 to 21 C)
22
Table 22 — Power Exhaust
Fan Operation Definitions
ITEM
BP
BPSO
BPSP
BPSR
EF
ECON
PED
PES
PWRX
to PWRX. The current configuration will be shown. Press
ENTER to set the configuration to modulating power exhaust. The acceptable range of values is 0 to 2, where 0 is
no fan, 1 is non-modulating, and 2 is modulating.
DEFINITION
Actual Space Pressure
Building Pressure Set Point Offset
Building Pressure Set Point
Building Pressure Submaster Reference
Discrete Output to Cycle Fan
Economizer Position
Analog Damper/Inverter Output
Power Exhaust Set Point
Power Exhaust Type
To set the Building Pressure Set Point, press
to
enter into the Service function. Enter the password. Press
to enter into the Building Pressure subfunction.
Scroll down to BPSP. The current pressure set point will be
shown in inches water gage. The default is 0.05 in. wg. The
acceptable range of values is 0.00 to 0.50 in. wg. To change
the set point, enter the new number (ex.
) and
press ENTER .
To set the Building Pressure Set Point Offset, press
to enter into the Service function. Enter the
password. Press
to enter into the Building Pressure subfunction. Scroll down to BPSO. The current offset
set point will be shown in inches water gage. The default is
0.05 in. wg. The acceptable range of values is 0.05 to
0.50 in. wg. To change the set point, enter the new number
(example:
) and press ENTER .
If the supply fan is off, then exhaust fan will be turned off
and BPSR set to minimum value. The exhaust fan is then
off, the discharge damper is closed, and the control input is
set to 0.
Configuration — To configure the modulating power exhaust, Select Exhaust Fan Type. See Table 23.
To select the exhaust fan type, press
to enter into
the Service function. Enter the password. Press
to
enter into the Factory Configuration subfunction. Scroll down
Table 23 — Configuring Modulating Power Exhaust
DESCRIPTION
SET POINT
RANGE
Select Exhaust Fan Type
FANT
Modu Pow Exh = 2*
Select Building Pressure Set Point
BPSP
Select Building Pressure Set Point Offset
BPSO
0.00 to 0.50 in. wg
(0.0 to 125 Pa)
0.05 to 0.50 in. wg
(12 to 125 Pa)
*If value changed, enable Data Reset before leaving
HOW TO CONFIGURE AT HSIO
.
23
mode will be overridden by simultaneous closure of any of
signal contacts for Pressurization, Smoke Purge, or Fire Shutdown and the system will be placed in Fire Shutdown mode.
To configure, make the field-connection at channel 39.
Smoke Control Group — This group includes Pressurization, Evacuation, Smoke Purge, and Fire Shutdown.
PRESSURIZATION — Pressurization mode is used to prevent entrance of smoke into the conditioned space in the event
of fire or other emergency condition. The pressurization function activates in response to closure of external signal contact set. The function also initiates an alarm signal to CCN
Building Supervisor. Pressurization is Mode 34. See
Table 24. The PSIO-2 module (available as a factoryinstalled option) is required to initiate this control function.
In addition, the factory-installed economizer option is
required.
An external alarm contact set (normally open, close on
initiation of mode, 24-vac pilot duty, connect to PSIO2, channel 37) is also required.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer opens and the HIR
energizes. The supply fan is energized (Exhaust Fan OFF).
The supply fan runs and delivers outside air to space (with
no exhaust capability). Pressurization mode will be overridden by simultaneous closure of any of signal contacts for
Evacuation, Smoke Purge, or Fire Shutdown and system will
be placed in Fire Shutdown mode. To configure, make the
field connection at channel 37.
EVACUATION — Evacuation mode is used to remove smoke
from the occupied space in response to closure of emergency signal contact set. Alarm is also initiated through CCN
Building Supervisor. Evacuation is Mode 35. See Table 24.
The PSIO-2 module (available as a factory-installed option) is required to initiate this control function. In addition,
the factory-installed economizer and factory-installed power
exhaust options are required.
An external alarm contact set (normally open, close on
initiation of mode, 24-vac pilot duty) connect to PSIO2, channel 39 is also required.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer opens. The supply
fan is deenergized. The exhaust fan is energized. The exhaust fan runs and extracts air from the space. Evacuation
SMOKE PURGE — Smoke Purge mode allows the system
to remove smoke from the space and fill the space with fresh
air, in response to closure of external signal contact set. Smoke
Purge is mode 36. See Table 24.
The PSIO-2 module (available as a factory-installed option) is required to initiate this control function. In addition,
the factory-installed economizer and factory-installed power
exhaust options are required.
An external alarm contact set (normally open, close on
initiation of mode, 24-vac pilot duty) connect to PSIO2, channel 38 is also required.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer opens. The HIR is
energized. The supply fan is energized. The exhaust fan is
energized. The supply fan runs and delivers outside air to
the space. The exhaust fans run and extract air from the space.
Evacuation mode will be overridden by simultaneous closure of any of signal contacts for Pressurization, Evacuation,
or Fire Shutdown and the system will be placed in Fire Shutdown mode. To configure, make the field connection at
channel 38.
FIRE SHUTDOWN — Fire Shutdown mode will end all
fan and system operations and close outside air and exhaust
dampers, in response to closure of external signal contact
set. Fire Shutdown is Mode 37. See Table 24.
The PSIO-2 module (available as a factory-installed option) is required to initiate this control function.
An external alarm contact set (normally open, close on
initiation of mode, 24-vac pilot duty) connects to PSIO2, channel 40 is also required.
Sequence of Operation — Normally Open contact set closes
for minimum 2 seconds. The economizer closes. The supply
fan is deenergized. The Exhaust Fan is OFF. To configure,
make a field connection at channel 40.
Table 24 — Smoke Control Operating Mode Details
35
SMOKE
PURGE
36
FIRE
SHUTDOWN
37
Off
On
On
Off
On
Open
Close
Off
Open
Close
On
Open
Close
Off
Close
Open
Close
Open
Open
Close
Open, Control
To Static
Pressure Set
Point
Close
Open, Control
To Static
Pressure Set
Point
Close
On
Off
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
MODE
PRESSURIZATION
EVACUATION
DISPLAY CODE (MODE)
POWER EXHAUST
OR RETURN FANS
SUPPLY-AIR FAN
ECONOMIZER DAMPER
RETURN-AIR DAMPERS
POWER EXHAUST
DISCHARGE DAMPER
34
SUPPLY-AIR FAN IGV OR
VARIABLE FREQUENCY
DRIVE
HEAT INTERLOCK
RELAY
GAS OR ELECTRIC
HEAT — ALL STAGES
HUMIDIFIER 1 AND 2
LEGEND
IGV — Inlet Guide Vanes
24
7. If IAQ is Priority 3 (low) and an IAQ sensor is connected, the control will evaluate IAQ sensor value. If the
IAQ sensor value exceeds the user-configured alert limits, an alert will be generated (viewed at the HSIO), and
broadcast to the CCN system supervisor (if applicable).
The economizer damper position is not affected.
Special Ventilation Group — This group includes Indoor Air Quality (IAQ), IAQ (Pre-Occupancy) Purge, Outdoor Air CFM Control (OAC), and IAQ/OAC Reheat.
INDOOR AIR QUALITY (IAQ) — Indoor Air Quality mode
will admit fresh air into the space whenever space air quality
sensors detect unsuitable space conditions. Fresh air is admitted by overriding the Economizer Minimum Damper position. The IAQ mode is permitted only during Occupied periods. See Table 25.
The IAQ mode also permits and controls analog-type reheat system (hydronic or a modulating control electric heater).
Priority for IAQ can be selected by user. The IAQ mode
can be selected to override the economizer damper position
at any time that IAQ mode is active (and IAQ requires a
more open economizer position to satisfy the space air quality criteria). The IAQ mode can also be configured so that it
will only dictate economizer position when no space heating
or cooling mode is active (active comfort mode will dictate
position for economizer outside air dampers) and/or be overridden by Comfort Overrides.
Occupied Cooling (including Economizer Cooling) and
Occupied Heating are permitted during IAQ and will function normally (except when IAQ mode priority is HIGH; then
active IAQ mode may dictate a more open economizer
position).
An IAQ sensor (field-supplied and installed), factoryinstalled economizer option, and factory-installed control options module (PSIO-2) are required.
NOTE: The unit control is factory-configured for IAQ sensors with a 0 to 10 vdc signal representing an air quality of
0 to 2000 ppm. Sensors with other characteristic curves will
require user reconfiguration (see Step 5 of configuration instructions below).
Sequence of Operation
1. If the supply fan is off, the outside air dampers will be
closed.
2. The IAQ is available when the VENT Option is 1 or 3,
the unit is in Occupied mode, IAQ Priority Level is 1
(High) or 2 (Medium), and supply fan is on.
3. The Master Loop will evaluate the IAQ set point and IAQ
sensor value, then calculate IAQ Minimum Damper Position (IQMP).
4. If the IAQ Priority Level is 1 (High), the economizer Submaster Loop will determine economizer damper position
based on the higher of IQMP or Minimum Damper Position (Minimum Damper Position determined by economizer mode or active comfort modes).
5. If the IAQ Priority Level is 2 (Medium) and Cooling (including Economizer Cooling) or Heating mode is active,
then the Economizer Submaster Loop will determine Minimum Damper Position and the economizer will close to
Minimum Damper Position (MDP).
Comfort Overrides:
VAV: If (SAT < SASP - 8 F) or (SAT > SASP + 5 F) for
4 minutes, then IQMP = 0 and economizer will close to
MDP.
CV: If (SPT > (OCSP + SPHO)/2) or (SPT < (OHSP +
SPLO)/2), then IQMP = 0 and economizer will close to
MDP.
Once CV Space Temp Override has been initiated, it will
remain in effect until SPT < OCSP and SPT > OHSP.
High Humidity:
If unit is equipped with humidity sensors and RH > HHL,
the IQMP = 0 and economizer will close to MDP.
The Economizer Submaster Loop will determine economizer damper position based on higher of IQMP or MDP.
6. If IAQ not required, then the unit control sets IQMP at 0.
The economizer remains at MDP position.
Table 25 — Indoor Air Quality/Purge/Reheat
Definitions
ITEM
HHL
IAQ
IAQG
IAQRR
IAQS
IQMP
IQMX
IRH
IRL
IVH
IVL
MDP
OAC
OAT
OCSP
OHSP
RH
SASP
SAT
SPHO
SPLO
SPT
VENT
DEFINITION
High Humidity Limit
Indoor Air Quality
IAQ Gain
IAQ Reset Reference
IAQ Set Point
IAQ Minimum Damper Position
IAQ Maximum Damper Position
IAQ Sensor High Reference
IAQ Sensor Low Reference
IAQ Sensor High Voltage Point
IAQ Sensor Low Voltage Point
Minimum Damper Position
Outdoor Air Control
Outdoor-Air Temperature
Occupied Cooling Set Point
Occupied Heating Set Point
Relative Humidity
Supply Air Set Point
Supply-Air Temperature
Space Temperature High Alert Limit (Occupied)
Space Temperature Low Alert Limit (Occupied)
Space Temperature
Ventilation Mode Configuration
Configuration — See Table 26. To configure:
1. Enable IAQ by selecting vent option. Press
to enter the subfunction. Scroll down to VENT. A VENT
value of 1 indicates algorithm will use MDP and IAQ
modes. A value of 3 indicates algorithm will use MDP,
IAQ, and Outdoor Air Control (OAC) modes. A 0 indicates the algorithm will only use MDP mode.
2. Select IAQ Priority. Press
to enter the subfunction. Scroll down to LEVEL. A LEVEL value of 1
indicates High (IAQ mode has priority over active comfort modes). A value of 2 indicates Medium (Active comfort mode or Comfort Overrides may determine economizer damper position, IAQ position overridden).
3. Select IAQ Set Point. Press
to enter the
subfunction. Scroll down to IAQS. Enter the new value.
The default is 650 ppm. The range is 1 to 5000 ppm.
4. Specify IAQ Maximum Damper Position. Press
to enter the subfunction. Scroll down to IQMX.
Enter the new value. The default is 50%. The range is 0
to 100%.
5. If non-Carrier sensor used (see Fig. 13):
a. Specify IAQ sensor curve. Press
to enter
the subfunction.
b. Configure Low Voltage Point. Scroll down to IVL. Default is 0 v. Range is 0 to 10 v.
c. Configure Low Reference. Scroll down to IRL. Default is 0 ppm. Range is 0 to 5000 ppm.
d. Configure High Voltage Point. Scroll down to IVH.
Default is 10 v. Range is 0 to 10 v.
25
e. Configure High Reference. Scroll down to IRH. Default is 2000 ppm. Range is 0 to 5000 ppm.
IAQ Algorithms
IQMP = ECON + 100 x IAQG x (Demand)/IAQS
Where:
ECON = Current position of economizer damper
(Demand) = IAQS - IAQ
NOTE: IQMP will not be recalculated until (Demand) exceeds 3% of IAQS.
provide complete exchange of indoor air with fresh air.
Duration of purge mode is user-configured (typically 5 minutes). The IAQ Purge is Mode 28. See Table 25. The factoryinstalled economizer option is required.
Sequence of Operation — The IAQ Purge will operate only
if the following conditions exist:
• Current Time and next Occupied Time are valid.
• Purge option is enabled.
• Unit is in Unoccupied state.
• Time is within 2 hours of next Occupied period.
• Time is within Purge Duration.
• Outside-Air Temperature reading is available.
If IAQ Purge is permitted, then IAQ Pre-Occupancy Purge
is enabled. The supply fan and Heat Interlock Relays are energized. The economizer minimum position is set to PURGEMP.
The economizer opens to PURGEMP. The purge continues
until Purge Duration expires or Occupied period begins.
NOTE: IAQ Purge is limited to one per Unoccupied period.
If PURGEMP = 0% then IAQ Purge is not enabled.
Configuration — See Table 27. To configure:
1. Enable Purge option. Press
to enter the subfunction. Scroll down to PURG. Set to 1 to Enable. (Set
to 0 to disable.)
NOTE: The following user-configured options require use
of Service Tool or CCN Building Supervisor to change.
2. Select Purge Duration period. Change IQPD set point. Default is 5 minutes. Range is 5 to 60 minutes.
3. Select Low Temperature Minimum Position. Change LTMP
set point. Default is 10%. Range is 0 to 100%.
4. Select High Temperature Minimum Position. Change HTMP
set point. Default is 35%. Range is 0 to 100%.
OUTDOOR AIR CONTROL (OAC) — The Outdoor Air Control function will maintain a minimum quantity of outdoor
airflow into an occupied space, regardless of space comfort
load conditions. The OAC is permitted only during Occupied periods. Occupied Cooling (including Economizer Cooling) and Occupied Heating are permitted during OAC and
will function normally, except when OAC mode is active,
then OAC mode may dictate a more open economizer position. See Table 28. The factory-installed economizer option and factory-installed control options module (PSIO-2)
are required.
An OAC Accessory package (consists of velocity sensor
and pressure transducer) (P/N 50DJ-900---791) is required.
LEGEND
IAQ — Indoor Air Quality
IAQS — IAQ Set Point
IRH — IAQ Sensor High Reference
IRL
— IAQ Sensor Low Reference
IVH
— IAQ Sensor High Voltage Point
IVL
— IAQ Sensor Low Voltage Point
NOTE: Voltage range is 0 to 10.
Fig. 13 — Sensor Use Example
IAQ (Pre-Occupancy) PURGE — If outdoor air conditions
permit, IAQ Pre-Occupancy Purge will open economizer and
energize supply fan 2 hours before next Occupied period, to
Table 26 — Configuring Indoor Air Quality (IAQ)
DESCRIPTION
HOW TO CONFIGURE AT HISO
SET POINT
Enable by selecting VENT option
VENT
Select IAQ Priority
LEVEL
1
3
1
2
3
=
=
=
=
=
RANGE
Use IAO only
Use IAQ and OAC
High
Medium (Space Comfort Overrides)
Low (Alert only)
Select IAQ Set Point
IAQS
1 to 5000 ppm
Specify IAQ Max Damper Position
IQMX
0 to 100%
Table 27 — Configuring IAQ (Pre-Occupancy) Purge
DESCRIPTION
HOW TO CONFIGURE AT HSIO
Enable Purge
26
SET POINT
RANGE
PURG
Enable = 1; Disable = 0
Table 28 — Outdoor Air Control Definitions
ITEM
ECON
OAC
OCS
OCMX
VENT
2. Select the OAC set point. Press
and
to enter
the subfunction. Scroll down to OCS. The default is
1 cfm. The range is 1 to 50,000 cfm.
3. Select the OAC Maximum Damper Position. Press
to enter the subfunction. Scroll down to OCMX.
The default is 50%. The range is 0 to 100%.
Algorithms
OAC Minimum Position = ECON + 100 x GAIN
x (Demand term)/OACS
where: (Demand term) = OACS − OAC
DEFINITION
Economizer Position
Outdoor Air Control
OAC Cfm Set Point
OAC Minimum Damper Position
Ventilation Mode Configuration
Sequence of Operation — If the supply fan is off and the
economizer damper is closed, OAC is available when the
VENT Option is 2 or 3, unit is in Occupied status, and supply fan is on. The control will calculate a Minimum Damper
Position based on the Outside Air CFM set point and the
Outside Air CFM (current delivered value).
The current delivered CFM value (OAC) is determined
by interpolating from a unit-size-specific table relating airflow rate to voltage drop at the outdoor cfm velocity sensor,
via pressure transducer in the outdoor cfm accessory package. The actual damper position will be determined by highest value demanded by available functions (OAC function,
IAQ function, Minimum Economizer Damper position, or
active comfort mode). The output signal from the economizer Submaster Loop to the economizer damper actuator
drives the damper to the desired position. If the economizer
position has been dictated by another function but this controlling function is driving economizer closed, economizer
position will not be permitted to move to a value below the
OAC Minimum Position.
Configuration — See Table 29. To configure the function:
1. Enable the OAC function. Press
to enter the
subfunction. Scroll down to VENT. Enable the function
by pressing
or
and ENTER . A 2 configures the function for Minimum Damper Position and OAC control only.
A 3 configures the function for Minimum Damper Position, IAQ, and OAC control.
IAQ/OAC REHEAT — When the IAQ/OAC routine has priority over comfort conditions, it is possible to introduce outside air at temperatures well below typical space temperatures. The IAQ/OAC Reheat function will modulate a unitor duct-mounted steam or hydronic heating coil (equipped
with modulating control valve) via a 4 to 20 mA control signal to raise supply-air temperature of outside air delivered to
ductwork. See Table 25.
A heating coil (field-supplied/installed) with control valve
connected to Ch. 43 and a supply air sensor located downstream of heating coil (will require relocation of sensor if
coil is mounted in duct) are required.
Sequence of Operation — If the supply fan is off, all modes
are deactivated and the heating control valves are closed. For
IAQ Reheat to be active: IQMP > MDP and OAT < SASP.
When IAQ Reheat is active, control will issue 4 to 20 mA
signal (at Channel 43) to hydronic heat control valve, to
maintain SAT control temp (IAQRR) at Supply Air sensor
location.
Configuration —To configure, enable IAQ Mode (see IAQ
section for configuration). Connect Hydronic Heat control
valve to channel 43.
Algorithms — When IAQ/OAC is active and OAT < SASP,
then IAQRR = SASP + (Space Temp Reset) − 5.0. In all
other conditions, IAQRR = 0.
Table 29 — Configuring Outdoor Air CFM Control (OAC)
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
Enable OAC Function (select VENT option)
VENT
Select OAC Set Point
OCS
OCMX
Select OAC Max Damper Position
27
RANGE
2 = Use OAC only
3 = Use IAQ and OAC
1 to 50,000 CFM
(1 to 23596 L/s)
0 to 100%
Dehumidification and Humidifier Group — This
group includes Dehumidification and Reheat, and Humidifier Controls.
DEHUMIDIFICATION AND REHEAT — Dehumidification will override comfort condition set points in order to
deliver cooler air to the space and satisfy a humidity set point
at the space or return air humidity sensor. Reheat will energize a gas heating section concurrent with compressor operation should the dehumidification operation result in cooling of the space down to Occupied Heating set point. Reheat
is not available on units equipped with factory-installed electric heaters. Dehumidification and Reheat (High Humidity
Override) is Mode 41. The unit must be equipped with the
factory-installed control options module (PSIO-2). A humidity sensor (field-supplied and -installed) is also required for
operation. See Table 30.
Dehumidification — The Master Loop (ML) reads the Return Air or Space Humidity sensor. When the relative humidity (RH) value exceeds the High Humidity limit set point,
the ML will issue CCSR value at low limit (typically 40 F)
to the CSL. The CSL will initiate steps of cooling operation
to maintain supply air temperature leaving unit at CCSR value.
Cooling operation will continue until the RH value at sensor
location equals the HHL set point. The ML will return CCSR
value to maintain set point SAT. Stages of cooling capacity
will be reduced until SAT rises back to the set point.
Reheat — When return air temperature (VAV) or space temperature (CV) drops below the Occupied Heating set point,
the Master Loop issues a SHSR value to the SHSL (while
maintaining Dehumidification CCSR at CSL). The SHSL initiates the staged heating cycle operation (operating simultaneously with Dehumidification/Cooling operation). Staged
Heating continues until OHSP is satisfied. When satisfied,
the ML issues minimum value SHSR and the SHSL terminates heating cycle. If the humidity level at sensor location
continues to exceed the set point, Dehumidification/Cooling
operation will continue.
Simultaneous operation of cooling and electric heaters is
never permitted on 50FP,JP,NP units. If the unit control detects that a compressor stage is active, then electric heater
operation is blocked. When the last compressor stage is turned
off, then Occupied Heat mode will be permitted. Heating will
continue until either the OHSP is satisfied or RH exceeds
the HHL set point. If RH, again, exceeds the HHL set point,
reheat will be terminated immediately and Dehumidification
will be re-initiated.
Configuration — To configure for a humidity sensor, press
to enter into the Service function. Enter the password. Press
to enter into the User Configuration
subfunction. Scroll down to HUSN. The current configuration will be shown. The default is 0 (no sensor). The acceptable range of values is 0 to 2, where 0 is no sensor, 1 is
differential humidity (2 sensors), and 2 is one return air or
ENTER to enable the humidity
space sensor. Press
or
sensors.
To set the high humidity limit value, press
to
enter into the Service function. Enter the password. Press
to enter into the User Configuration subfunction. Scroll
down to HHL. The current configuration will be shown. The
default is 99% (relative humidity). The acceptable range of
values is 0 to 100%. To change the set point, press the new
number (example
) and press ENTER . See Table 31.
NOTE: To permit Reheat on VAV unit, unit must be configured for Occupied Heating. Simultaneous heating-cooling
operation is permitted only on units with gas heating section
or hydronic heating system.
Table 30 — Dehumidification and
Reheat Definitions
ITEM
CCSR
CSL
HHL
HUSN
ML
OHSP
RH
SAT
SHSL
SHSR
DEFINITION
Cooling Submaster Reference
Cooling Submaster Loop
High Humidity Limit (Set Point)
Humidity Sensor(s) Option
Master Loop
Occupied Heating Set Point
Relative Humidity
Supply-Air Temperature
Staged Heating Submaster Loop
Staged Heating Submaster Reference
HUMIDIFIER CONTROL — There are 2 types of Humidifier control functions available with these units: Analogoutput control or Discrete-output control. Analog-output control
is used to control a proportional steam valve serving a steam
grid humidifier (field-supplied and -installed). Discreteoutput is used to control a single-stage humidifier with a spray
pump (field-supplied and -installed). See Table 32.
A humidifier system (control connects to PSIO2,
Channel 45) and a humidity sensor are required. The control
options module (PSIO2) is required for humidifier control.
Table 32 — Humidifier Control Definitions
ITEM
HUEN
HUM
HUSN
HUSP
HUSR
RH
DEFINITION
Humidifier Type Configuration
Humidifier Position (Analog)
Humidity Sensor(s) Configuration
Humidity Set Point
Humidity Submaster Reference
Relative Humidity
Sequence of Operation (Analog-Output Device)
1. If the supply fan is off, the humidifier will be off.
2. If the Occupancy Schedule indicates Unoccupied mode,
the humidifier will be off.
3. When the humidity level at the sensor drops below the
set point, if the supply fan is ON and unit is in Occupied
mode, an output signal will open the steam valve until
the set point is satisfied.
4. When the humidity level at the sensor exceeds the set
point, the steam valve will be closed.
Table 31 — Configuring Dehumidification and Reheat
DESCRIPTION
Set Dehumidification Set Point
(‘‘High Humidity Override’’)
HOW TO CONFIGURE AT HSIO
SET POINT
RANGE
HHL
0 to 100%
NOTE: If Unit Type is VAV, unit must be configured for Occupied Heating Enabled (see Table 13, Configuring Heating).
28
Sequence of Operation (Discrete-Output Device)
1. If the supply fan is off, then the humidifier will be off.
2. If the Occupancy Schedule indicates Unoccupied mode,
the humidifier will be off.
3. When the humidity level at the sensor drops below the
set point, the output signal will energize the spray pump
control until the set point is satisfied.
4. When the humidity level at the sensor exceeds the set
point, the spray pump control will be deenergized.
Configuration — To configure:
1. Identify the sensor type. Press
to enter the
subfunction. Scroll down to HUSN. Press
or
and
ENTER . If differential humidity sensors are installed, configuration should be set to 1. If a single humidity sensor is
installed (space or return air), configuration should be set
to 2.
2. Identify Humidifier control type. Press
to enter
ter the subfunction. Scroll down to HUEN. Configuration
can be set to 1 or 2. For analog applications, select 1. For
discrete applications, select type 2. Enable Data Reset.
3. Set Humidity Set Point. Press
to enter the subfunction. Scroll down to HUSP. The default is 40% rh
(relative humidity). The range is 0 to 100% rh.
Algorithms
HUSR = PID function on (Demand term)
where (Demand term) = Humidity Set Point − Humidity
Sequence of Operation — The status of the supply fan is determined. If the fan status is on, the control reads the duct
static pressure and calculates the Duct Static Pressure SR
(value required to satisfy conditions). The control outputs
this value to the IGV/VFD SL. The SL compares DSPSR to
actual duct pressure and determines the required IGV position or VFD speed. The required position/speed is set to the
IGV actuator or VFD via Channel 16. The IGV responds to
the position signal by opening or closing the supply fan inlet
guide vanes; the VFD responds to the speed signal by increasing or decreasing supply fan motor speed.
If the fan status is not on within 1 minute of the fan start,
the fan relay commanded state is evaluated. If the state is on,
the ML control will check if the fan failure alarm has been
tripped. If the alarm has not tripped, algorithm will continue
controlling supply fan volume until the alarm is set (adding
a 1 minute delay). If the alarm has tripped, then the fan state
is considered off and the IGV actuator will be driven closed
or VFD will be turned off.
Algorithm — DSPSR = PID function on (demand term) where
(demand term) = Static Pressure Set Point − Static Pressure.
Configuration — To enable Duct Pressure mode, press
to enter into the Service function. Enter the password. Press
to enter into the User Configuration subfunction. Scroll down to DPEN. The current configuration
ENTER to
will be shown. The default is 0 (disabled). Press
enable the Duct Pressure mode. The acceptable range of values is 0 and 1, where 0 is disabled and 1 is enabled.
To set the Static Pressure set point, press
to enter
into the Set Point function and the Set Point subfunction.
Scroll down to SPSP. The current set point will be shown.
The default is 1.5 in. wg. The acceptable range of values is
0.0 to 5.0 in. wg. To change the set point, enter the new
number (example:
) and press ENTER . See Table 34.
Supply Fan Volume and VAV Control Group —
This group includes Duct Pressure Control (IGV/VFD control), Supply Air Temperature (SAT) Reset from Space Temperature, and SAT Reset from External Signal.
SUPPLY FAN VOLUME CONTROL (VAV Only) — The
control will modulate control output to an Inlet Guide Vane
(IGV) option or a Variable Frequency Drive (VFD option),
in a VAV system, to maintain duct static pressure at userconfigured set point. See Table 33.
The following items are required for supply fan volume
control:
• IGV or VFD Option
• 1⁄4-in tubing (flame-retardant plenum duty)
• static pressure probe
SUPPLYAIR TEMPERATURE RESET FROM SPACE TEMPERATURE (VAV Units Only) — The SAT reset from space
temperature allows the Supply-Air Temperature set point of
a VAV system to be adjusted up as the space temperature
falls below the Occupied Set point, in order to maintain ventilation to the occupied space and minimize cooling stage
operation. Supply Air Temperature Reset is Mode 21.
As space temperature falls below the cooling set point,
the supply air set point control value will be reset upward as
a function of the Reset Ratio (RTIO).
RTIO = degrees change in SAT per degree of Space
Temperature change
The Reset Limit (LIMT) will limit maximum number of
degrees the SASP may be raised.
Table 33 — Supply Fan Volume Control Definitions
ITEM
DPEN
DSPSR
SL
SPSP
SR
DEFINITION
Duct Pressure Control Option
Duct Static Pressure Submaster Reference
Submaster Loop
Static Pressure Set Point
Submaster Reference Value
Table 34 — Configuring Supply Fan Duct Pressure Control (IGV/VFD)
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
RANGE
Enable Duct Pressure Function
DPEN
Enable = 1; Disable = 0
Select Duct Pressure Set Point
SPSP
0.0 to 5.0 in.w g (0 to 1246 Pa)
29
to Unoccupied mode. An external control signal (24-vac) is
required.
NOTE: Unit cannot be returned to Standby mode from a remote signal. Standby can only be re-entered via HSIO
command.
Application of the 24-v signal will switch the unit from
current mode (Standby or Unoccupied) to Occupied. The unit
will initiate Occupied modes as determined by set points.
Removal of the 24-v signal will return control to Unoccupied mode.
Install a LOCAL/REMOTE (SPST-OFF/ON) manual switch
in the 24-v signal input. A setting of LOCAL (OFF) prevents
accidental start caused by remote control system during service or maintenance. A setting of REMOTE (ON) allows the
remote system to start unit with a 24-v signal.
Configuration — Connect remote signal leads to Channel 49
(DSIO no. 2, J3-1, J3-2). To ensure unit returns to Unoccupied mode whenever signal is removed, provide Time Schedule for Unoccupied periods as 24 hr per day (zero hours for
Occupied period).
SPACE TEMPERATURE OFFSET (CV Only) — The Space
Temperature Offset (STO) function permits occupants to adjust the space temperature set point by −5 F, using a T-56
sensor (equipped with sliding scale adjustment).
A T-56 Space Sensor (field-supplied and -installed) is
required.
Sequence of Operation — The STO channel provides analog input to the control, indicating desired shift in space set
point. The control scales the voltage to −5 to +5 F range.
The configured Space Temperature Set Point is altered by
the offset value.
Configuration — To configure, connect the T-56 lead from
‘‘SW’’ terminal to PSIO1 Terminal 33 (via TB3-3).
Space Temperature (SPT) is compared to Occupied Cooling set point (OCSP). If the SPT is below OCSP, the reset
value is calculated. If the reset value is greater than Reset
Limit, then Reset Limit will be used as the reset value. The
CSL uses an adjusted control value for determining stages
of cooling control during the reset function.
SRV Formula: RESET = (OCSP − SPT) x RTIO
To enable Supply Air Temperature Reset, press
.
Enter the password. Press
to enter into the User Configuration subfunction. Scroll down to RSEN (Reset
Enable). The current configuration will be displayed (0 = disabled, 1 = enabled). The default is disabled. To change the
configuration, press the number of the new configuration
(example:
) and then press ENTER .
To configure the Supply Air Temperature Reset Ratio, press
to enter into the Space Temperature Reset Configuration subfunction. Scroll down to RTIO (Reset Ratio).
The current configuration will be displayed.
The default is 3 F. The range of acceptable values is 0 to
10 F. To change the set point, press the number of the
new configuration (example:
) and then press ENTER .
To configure the Supply Air Temperature Reset Limit,
press
to enter into the Space Temperature Reset
Configuration subfunction. Scroll down to LMIT (Reset Limit).
The current configuration will be displayed.
The default is 10 F. The range of acceptable values is 0 to
20 F. To change the set point, press the number of the new
configuration (example:
) and then press ENTER . See
Table 11.
SUPPLY AIR TEMPERATURE RESET (External Signal)
— Building/energy management systems can initiate a reset
of the unit Supply-Air Temperature set point by up to
20 F, based on external space or energy control system
requirements.
An external source analog signal, 2 to 10 vdc, is required.
Connect signal leads at PSIO2, Channel 42.
Sequence of Operation
VAV Units — An input signal at Channel 42 will be scaled
to 0 to 20 F range, representing reset value. The reset value
will be added to the cooling set points and subtracted from
heating set points. If (internal) Space Temperature Reset is
enabled, the reset value will be the higher of the external
reset and the Space Temperature Reset value.
CV Units — The input signal at Channel 42 will be scaled
to 0 to 20 F range, representing reset value. The reset value
will be added to the cooling set points and subtracted from
heating set points. If unit is equipped with a T-56 Space
Sensor and is using the Space Temperature Offset function,
SAT Reset from remote signal is NOT AVAILABLE.
Configuration — To configure, connect the external signal
input to Channel 42.
Special Systems Group — This group includes Hydronic Heating Control, Freezestat, Lead/Lag, Head Pressure Control (Motormastert Control), and Transducers and
Thermistors feature.
HYDRONIC HEATING — The Hydronic Heating function
will modulate a control valve in a steam or hydronic heat
system (field-supplied and -installed), to maintain building
temperature at user configured set point. Analog output is 4
to 20 mA. See Table 35.
A heating coil with proportional control valve (fieldsupplied and -installed) is required. A field-supplied connection from the control valve to Channel 43 is also required.
The control options module (PSIO2) is required for hydronic heating.
Table 35 — Hydronic Heating Definitions
ITEM
HCFD
HCSCV
HCSMG
HCSR
HCV
IAQ
OHEN
OHSP
RAT
SAT
SPT
UHSP
Remote Controls Group — This group includes Remote Start (Occupied/Unoccupied status control) and Space
Temperature Offset (CV only).
REMOTE START — The Remote Start function allows a
general-purpose building/energy management system to signal the unit to switch between Unoccupied and Occupied
modes from a remote location. This function will also override a Standby command status by initiating an Occupied
mode. Upon removal of remote signal, unit will switch
30
DEFINITION
Heating Coil Fan Off Value
Heating Coil Submaster Center Value
Heating Coil Submaster Gain
Heating Coil Submaster Reference
Heating Coil Value (Analog)
Indoor Air Quality Function
Occupied Heating Enable/Disable
Occupied Heating Set Point
Return-Air Temperature
Supply-Air Temperature
Space Temperature
Unoccupied Heating Set Point
in the coil (by opening control valve on low temperature
signal). The function also turns the supply fan off and returns economizer dampers to minimum position.
A contact set (Normally Open, 24-vac pilot duty) is required. Contact set will close on fall in temperature at freezestat set point. The control options module (PSIO2) is required
for operation.
Sequence of Operation
1. Freezestat signal contacts close on temperature drop.
2. A 24-v signal applied to Channel 41.
3. After 2 to 10 second delay, the control will turn the supply fan off, direct the heating control valve to fully open,
and return the economizer to the Minimum Damper
Position.
4. An alarm is initiated (alarm 88).
5. Alarm status maintained until control is manually reset.
Configuration — To configure, configure the unit for Hydronic Heating. See Hydronic Heat section for more information. Connect switch contacts (NO) and 24-vac power supply
to Channel 41.
Sequence of Operation
1. If the supply fan is OFF, or if Unoccupied Free Cooling
is active, the heating value is modulated to maintain desired minimum supply air temperature (HCFO).
2. If the supply fan is on, unit is in Occupied mode, or Optimal Start or Unoccupied heat modes are active:
VAV Units — The Control will determine if heating is required. Heating is required if the return-air temperature
(RAT) is less than the heating set point and the unit is one
of the following: in Unoccupied mode, performing warmup, or Occupied Heating is enabled. When heating is required, control will modulate heating coil control value
to maintain desired supply-air temperature.
CV Units —The control reads the space temperature sensor value and calculates the required heating coil control
value (the supply-air temperature required to satisfy load
conditions). The control will modulate heating coil control valve to maintain desired SAT control value.
3. When heating is activated, the HIR relays will be
energized.
4. A possible override of the Hydronic Heating function may
occur if the IAQ Reheat function is active.
Configuration — See Table 36. To configure:
1. Select Heat Type. Press
to enter the subfunction. Scroll down to HEAT. Set Type to 1 (water/steam).
Enable Data Reset.
2. Enable Occupied Heating (optional). Press
to
enter the subfunction. Scroll down to OHEN. Press
ENTER to enable Occupied heating.
3. Select Heating set points. Press
to enter the
subfunction.
a. Set the Occupied Heating Set Point. Scroll down to
OHSP. The default is 68 F. The range is 55 to 80 F.
b. Set the Unoccupied Heating Set Point. Scroll down to
UHSP. The default is 55 F. The range is 40 to 80 F.
4. Select Heat Coil Fan Off set point. Press
to
enter the subfunction. Scroll down to HCFO. The default
is 40 F. The range is 35 to 65 F.
Algorithms
HCSR = PID function on (Demand term)
where:
VAV: (Demand term)
= Heating set point − Return Air Temperature
CV: (Demand term)
= Heating set point − Space Temperature
LEAD/LAG OPERATION — Lead/lag operation will distribute starts between the two refrigeration circuits in an effort to equalize the running time on the two circuits. Lead/
lag is factory-enabled except when the Hot Gas Bypass (HGBP)
option is ordered. The HGBP function is available on designated lead circuit (circuit A) only, so lead/lag function is
disabled.
To disable lead/lag, press
. Scroll down to LLAG.
ENTER
Press
to disable.
To enable lead/lag, press
Press
ENTER
. Scroll down to LLAG.
to enable.
HEAD PRESSURE/FAN CYCLING CONTROL (Motormastert Head Pressure Control) — The control will cycle
condenser-fan motors on each refrigeration circuit at low ambient temperatures in order to maintain proper head pressure
and liquid temperature for refrigeration system operation. See
Table 37.
Sequence of Operation — Motormaster head pressure control option enabled (default):
On standard unit (without transducers), the first stage of
Outdoor Fan(s) operation (on each circuit) will turn on when
the Saturated Condensing Temperature on either circuit is
greater than (HPSP − 15 F).
NOTE: The default for HPSP is 113 F.
FREEZESTAT — The Freezestat function will attempt to
prevent freezing at the Hydronic Coil by raising temperature
Table 36 — Configuring Hydronic Heating
Select Heat Type
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
HEAT
RANGE
Hot water/Steam = 1*
None = 0
Opt: Enable Occupied Heating
OHEN
Enable = 1; Disable = 0
OHSP
55 to 80 F (13 to 27 C)
UHSP
40 to 80 F (4 to 27 C)
HCFO
35 to 65 F (2 to 18 C)
Select Heating Set Points:
Occupied Heating Set Point
Unoccupied Heating Set Point
Select Heat Coil Fan Off Set Point
*If value changed, enable Data Reset before leaving
(Serv Tool or Bldg Super)
.
NOTE: Occupied Heating Set point serves as ‘‘Morning Warm-Up Set Point.’’
31
Table 37 — Head Pressure Control Definitions
ITEM
HPSP
MMAS
SCT
The control options module (PSIO2) and pressure transducers are required.
Sequence of Operation — The control will read channels 3
and 4 as Discharge Pressure Transducer inputs. Alarms 76
and 77 (High Discharge Pressure) will be permitted. The control will read Channels 5 and 6 as Suction Pressure Transducer inputs. Alarms 74 and 75 (Low Pressure), Alarms 80
and 81 (Low Saturated Suction Temperature), Alarms 82 and
83 (High Superheat), and Alarms 84 and 85 (Low Superheat) will be permitted.
Configuration — To configure:
1. Enable Transducer Inputs. Press
to enter the
ENTER to
subfunction. Scroll down to TRNS. Press
enable.
2. Enable Suction Thermistors. Press
to enter
ENTER to
the subfunction. Scroll down to SUSN. Press
enable.
DEFINITIONS
Head Pressure Set Point
MotormasterT Function Configuration
Saturated Condensing Temperature
On units with transducer accessory, first stage of Outdoor
Fan operation (on each circuit) will turn on when Saturated
Condenser Temperature is greater than 138 F.
The first stage of outdoor fan operation will turn off when
Saturated Condensing Temperatures on both circuits are less
than (HPSP − 37 F) for 90 seconds.
The second stage of outdoor fan operation will be off whenever compressors on its circuit are off. The second stage of
outdoor fan operation will be delayed for 60 seconds after
start of compressor (or until SCT is greater than 143 F, when
the second stage of outdoor fan operation will start immediately). The control will energize the second stage of outdoor fan operation whenever the SCT exceeds the HPSP. The
control will deenergize the second stage of outdoor fan operation when the SCT has been less than (HPSP − 35 F) for
period of 2 minutes.
NOTE: The second stage of outdoor fan operation on a circuit may be added as rapidly as 2 seconds but may not be
removed during two minutes of minimum ON time.
Motormaster option disabled: The first stage of outdoor
fan operation for a refrigerant circuit will be on whenever
mechanical cooling is on for that circuit. Outdoor fan motor
no. 1 is off when mechanical cooling is OFF.
The second stage of outdoor fan operation will be off whenever compressors on its circuit are off. The control will energize the second stage of outdoor fan operation whenever
the SCT exceeds the HPSP. The control will deenergize the
second stage of outdoor fan operation when the SCT has been
less than (HPSP − 35 F) for period of 2 minutes.
NOTE: The second stage of outdoor fan operation on a circuit may be added as rapidly as 2 seconds but may not be
removed during 2 minutes of minimum ON time.
Configuration — See Table 38. To disable the Motormaster
function, press
to enter the subfunction. Scroll down
to MMAS. Press
ENTER
Carrier Comfort Network (CCN) Group — This
group includes Demand Limit control and Digital Air Volume (DAV) application.
DEMAND LIMIT — The Demand Limit mode limits stages
of cooling capacity, resulting from a signal (‘‘Redline Alert’’
or ‘‘Loadshed’’) from the CCN. The ‘‘Network Loadshed’’
option with CCN is required. Demand Limit is Mode 22.
The CCN Building Supervisor package is required.
Sequence of Operation
Redline Alert — When a Redline alert is received from the
CCN, the maximum stage of capacity is set equal to the current stage of operation. If the unit is not operating when alert
signal is received, capacity stage will be set at zero for
15 minutes, then restart permitted as normal.
Loadshed — At a Loadshed command from the CCN, the
control will reduce present maximum stage (determined at
Redline Alert) to user-defined percentage of present maximum stage. If unit at zero already, unit will remain at zero
for 15 minutes, then control will permit unit to climb to userdefined percentage of maximum.
Example — Maximum stages for unit size is 11 and Demand
Limit set point is 40%. At a Redline Alert signal, the unit is
currently operating at 10 stages (this becomes the new maximum stages value). At a Demand Limit signal, the maximum number of stages is reduced by the user-defined set
point limit (0.40 x 10 = 4 stages permitted). Unit operation
will continue with the number of stages limited to reduced
value until the Loadshed signal is cleared (removed) by CCN.
The Loadshed mode is limited to 1 hour. If the Loadshed
mode is not cleared by the Loadshed option before the 1-hour
limit expires, the mode is automatically cleared and unit operation will return to normal.
to disable. The default is enabled.
To enable the Motormaster function, press
to
enter the subfunction. Scroll down to MMAS. Press
ENTER to enable.
To adjust the default Head Pressure Set Point, press
. Scroll down to HPSP. Enter the new value. Default
is 113 F. Range is 80 to 150 F. Enable Data Reset.
TRANSDUCERS AND SUCTION THERMISTORS — The
Transducers and Suction Thermistors function allows the control to read pressure transducers as valid inputs, replacing
the condenser coil thermistor and low pressure switch inputs
at Channels 3, 4, 5, and 6.
Table 38 — Configuring Head Pressure Control (Motormaster Control)
DESCRIPTION
HOW TO CONFIGURE AT HSIO
SET POINT
RANGE
Disable ‘‘Motormaster’’
MMAS
Disable = 0; Enable = 1
Adjust Head Pressure Set Point
HPSP
80 to 150 F (27 to 65 C)*
*If value changed, enable Data Reset before leaving
.
32
VAV Systems — During occupied and biased occupied periods on VAV systems, the rooftop unit PIC uses the AOZT
from the TSM to replace the rooftop unit PIC return-air temperature sensor value. During unoccupied periods, the rooftop unit PIC uses the AZT from the TSM instead of the rooftop unit PIC space temperature and return-air temperature
sensor values.
Optimal Start Routine — The following TSM points are used
in the optimal start portion of the rooftop unit PIC adaptive
optimal start/stop routine (AOSS): AZT, NEXTOCCT, NEXTOCCD, PREVUNOT, and PREVUNOD from the TSM. The
rooftop PIC uses this information to calculate a bias time
that is then used by both the rooftop PIC and the TSM. When
the current time of day is greater than the biased start time,
the rooftop PIC uses the AOZT from the TSM to determine
when the occupied set point has been achieved.
Unoccupied Free Cooling — When the unoccupied free cooling is configured, the rooftop PIC uses the AZT from the
TSM instead of the space temperature to determine if unoccupied free cooling should operate.
Supply-Air Set Point (SASP) — When Space Temperature
(SASP) reset is configured, the rooftop unit PIC uses theAOZT
and the AOCS from the TSM instead of the space temperature to determine the amount of reset required.
Linkage Alarms — If the rooftop unit PIC which had previously been operating as part of a DAV system detects a
communication failure between the rooftop unit and the TSM,
the rooftop unit PIC continues to operate for 5 minutes using
the last information it received from the TSM. If communication resumes within the 5-minute period, normal system
operation continues. If the communication failure persists beyond 5 minutes, the rooftop unit PIC generates a linkage failure alarm. At that time, the rooftop unit PIC will return to
stand-alone operation using its own sensors and set points.
If the internal occupancy schedule for the rooftop unit PIC
has not been configured, the controls will maintain the same
occupancy state as prior to the linkage failure. If the occupancy schedule is configured on the rooftop unit PIC, the
controls will maintain the same occupancy state as prior to
the linkage failure until the next scheduled occupancy transition. At that time, the rooftop unit PIC will revert to its
own internal occupancy schedule.
If communication is restored, normal DAV system operation resumes, and the rooftop unit PIC generates a linkage
return−to−normal message.
Configuration — To configure:
1. Enable Demand Limit. Press
to enter the subENTER
function. Scroll down to DLEN. Press
to
enable.
2. Select Loadshed Groups. Press
to enter
the subfunction. Scroll down to LSGP. Coordinate Group
selection with CCN Loadshed Module equipment schedules. Default is group 1. Range is 1 to 16.
3. Specify Demand Limit Set Point. Press
to enter
the subfunction. Scroll down to LSP. The default is 50%.
The range is 0 to 100 %.
DIGITAL AIR VOLUME (DAV) — Carrier rooftop units
with PIC may also have a communication linkage with the
VAV terminal units in a particular application. This linkage
is called the DAV linkage. The DAV mode indicates the unit
is being controlled through a CCN network and is connected
to DAV system. Digital Air Volume (DAV) is Mode 39. The
CCN Building Supervisor system is required. The CCN must
be connected to PSIO1, COMM1 port.
Linkage Data and Operation — The values from the Terminal System Manager (TSM) which are used as linkage data
by the rooftop PIC control are found in Table 39.
Table 39 — TSM Linkage Codes
ITEM
AOCS
AOHS
AOZT
AUCS
AUHS
AZT
NEXTOCCD
NEXTOCCT
NEXTUNOD
NEXTUNOT
OCCSTAT
PREVUNOD
PREVUNOT
DEFINITION
Average Occupied Cool Set Point
Average Occupied Heat Set Point
Average Occupied Zone Temperature
Average Unoccupied Cool Set Point
Average Unoccupied Heat Set Point
Average Zone Temperature
Next Occupied Day
Next Occupied Time
Next Unoccupied Day
Next Unoccupied Time
Occupancy Status
Previous Unoccupied Day
Previous Unoccupied Time
Cooling/Heating Routines — When the rooftop unit PIC is
part of a DAV system, the rooftop unit PIC utilizes information supplied by the TSM to control cooling, heating, and
economizer routines instead of using its own return air and
space temperature sensors. The AOHS, AOCS, AUHS, and
AUCS from the TSM are used instead of the rooftop unit
PIC configured set points. The rooftop unit uses the occupancy status information through the communication linkage, such as NEXTOCCT and NEXTUNOT, instead of its
internal occupancy schedule.
33
NOTE: Either the T-55 or the T-56 sensor must be connected
for CV applications to function.
INSTALLATION INFORMATION
Control Wiring — See Fig. 14 - 29 for connections to
unit. The recommended types of control wiring for unit devices are listed in Table 40.
SENSORS — Sensors should be wired using single twisted
pairs of 20 AWG (American Wire Gage) conductor cable rated
for the application, except for the T-56 accessory sensor which
requires 3-conductor cable.
NOTE: Humidity and CO2 sensors must each be powered
from an isolated 24-v power supply.
HUMIDITY CONTROL AND HOT WATER AND STEAM
VALVES — These devices require 20 AWG twisted pair conductor cables rated for the application for the 4 to 20 mA
signal.
SPACE TEMPERATURE SENSOR (T-55 and CEC012144801) — The space temperature sensor is shipped standard with
every unit, and is located in the main control box. Space temperature sensor wires are to be connected to terminals in the
unit main control box. The space temperature sensor includes a terminal block (TB1), a jumper between pins E2
and E3, and an RJ11 female connector. The RJ11 connector
is used to tap into the Carrier Comfort Network (CCN) at
the sensor. See RJ11 Plug Wiring section on page 43 to connect the RJ11 connector to the CCN.
Table 40 — Recommended Sensor and
Device Non-Shielded Cable
MANUFACTURER
Alpha
American
Belden
Columbia
Manhattan
Quabik
PART NO.
Regular Wiring
Plenum Wiring
1895
—
A21451
A48301
8205
884421
D6451
—
M13402
M64430
6130
—
Optional Smoke Control — When the unit is equipped
with an optional smoke control and a fire system is installed,
4 modes are provided to control smoke within areas serviced
by the rooftop unit. Each mode must be energized individually from the approved building fire alarm system, and the
corresponding alarm is then generated at the HSIO keypad
or building supervisor. The 4 modes are Fire Shutdown mode,
Evacuation mode, Pressurization mode, and Smoke Purge
mode.
For Fire Shutdown mode, the PSIO-2 module (available
as a factory-installed option) is required to initiate this control function.
For Pressurization mode, the PSIO-2 module (available
as a factory-installed option) is required to initiate this control function. In addition, the factory-installed economizer
option is required.
For Evacuation and Smoke Purge modes, the PSIO-2 module (available as a factory-installed option) is required to initiate this control function. In addition, the factory-installed
economizer and factory-installed power exhaust options are
required.
The building fire alarm system must provide 4 normally
open contact closures (rated for 24-vac). These contacts must
be wired between TB2-6 and the PSIO2 plug J7 (bottom)
appropriate connection. Refer to the unit wiring diagram for
the corresponding connection point on PSIO2, plug J7
(bottom).
Jumper MUST be in place between pins E2 and E3 or
inaccurate readings could result.
To connect the space temperature sensor (Fig. 14):
1. Connect 1 wire of the twisted pair to terminal T1
and connect the other wire to terminal T2 on terminal
block 1 (TB1) located on the cover of the space temperature sensor using a 20 AWG twisted pair conductor cable
rated for the application.
2. Connect the other ends of the wires to terminals 1 and 3
on TB3 (sizes 034-048) or terminals 1 and 2 on TB2 (sizes
054-074), located in the unit main control box.
NOTE: This sensor should be installed for all applications.
For VAV applications, it is used to control heating and cooling during unoccupied periods. For DAV applications, it is
used to maintain control of the space during linkage failures
with the TSM (terminal system manager).
SPACE TEMPERATURE SENSOR (T-56 and CEC012150301) (CV Applications Only) — Space temperature sensor wires
are to be connected to terminals in the unit main control box.
The space temperature sensor includes a terminal block (TB1),
a jumper between pins E2 and E3, and an RJ11 female connector. The RJ11 connector is used to tap into the CCN at
the sensor. See RJ11 Plug Wiring section on page 43 to connect the RJ11 connector to the CCN.
Heat Interlock Relay (HIR) Function Wiring (VAV
Units Only — Not necessary for DAV applications) — Variable-air volume units which provide staged
heating (for morning warm-up, unoccupied heat, or occupied heat modes) require that room terminals be controlled
to go to the fully open position when the unit goes into the
unoccupied or occupied heating mode. The HIR function is
provided for this control. When the unit goes into heating
mode, the contact set at Channel 60 (DSIO2) is energized to
provide switch closure or opening (depending on how the
field-supplied power source is set up) to open the room terminals. The field-supplied connections for interlock function are:
Jumper MUST be in place between pins E2 and E3 or
inaccurate readings could result.
To connect the space temperature sensor (Fig. 14):
1. Connect 1 wire of the 3-conductor cable to terminal TH,
1 wire to terminal COM, and the other wire to terminal
SW on terminal block 1 (TB1) located on the cover of the
space temperature sensor using a 20 AWG twisted
3-conductor cable rated for the application.
2. Connect the other ends of the wires to terminals 1, 3, and
7 on TB3 (sizes 034-048) or terminals 1, 2, and 7 on TB2
(sizes 054-074), located in the unit main control box. The
wire from terminal SW MUST be connected to terminal
7 for all sizes.
HEAT INTERLOCK RELAY
Normally Closed
Normally Open
TERMINALS
Sizes 034-048 Sizes 054-074
2 and 4
8 and 10
4 and 5
8 and 9
NOTE: A field-supplied power source is required. See
Fig. 16 and unit wiring schematic for wiring details.
34
Remote Reset — The unit controls allow for remote input from an energy management system (EMS) or some other
input to offset the space temperature set point on CV applications or to reset the supply-air set point on VAV applications. A remote, isolated, 2 to 10 vdc signal may be used to
achieve this purpose. See Fig. 27 for wiring details.
Remote RUN/UNOCCUPIED Control — This control is for applications where it is necessary to control the
unit occupancy mode from a remote timeclock or switch.
See Fig. 18 for appropriate field wiring. When signal (24-v)
is applied to Channel 49, unit will enter occupied mode. Removal of signal returns unit to unoccupied mode. Place LOCAL/
REMOTE switch in REMOTE (ON) position.
STANDARD T-55 (CEC0121448-01)
SENSOR
T2
T1
SIZES
034-048
SIZES
054-074
TB3
TB2
1
1
3
2
ACCESSORY T-56* (CEC0121503-01)
SENSOR
COM
TH
SW
SIZES
034-048
SIZES
054-074
TB3
TB2
1
1
3
2
7
7
Fig. 14 — Space Temperature Sensor Wiring
35
LEGEND
COM — Common
T
— Terminal
TB
— Terminal Block
Accessory
Field Wiring
*Constant volume applications only.
RED
BLK
RED
BLK
SIZES
SIZES
054-074 034-048
TB3
TB2
1
1
3
2
RED
RED
RED
BLK
BLK
BLK
TO PROCESSOR
MODULE NO. 1
SENSOR 1
SENSOR 2
SENSOR 3
SENSOR 4
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION
SIZES
054-074
TB3
1
3
SIZES
034-048
TB2
1
2
RED
RED
BLK
BLK
RED
BLK
RED
BLK
TO PROCESSOR
MODULE NO. 1
SENSOR 1
RED
RED
BLK
BLK
SENSOR 5
SENSOR 6
RED
BLK
SENSOR 4
LEGEND
TB — Terminal Block
Factory Wiring
Field Wiring
SENSOR 3
SENSOR 2
RED
RED
BLK
BLK
SENSOR 7
SENSOR 8
SENSOR 9
SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION
Fig. 15 — Space Temperature Sensor Averaging
SIZES
034-048
SIZES
054-074
TB3
TB2
4
8
5
TO
ROOM
TERMINALS
9
HIR
HIR
10
2
Fig. 16 — Heat Interlock Relay Wiring (PIC Control Units)
36
TO
ROOM
TERMINALS
PSIO NO. 2
J7
PRESSURIZATION
19
SIZES
034-048
SIZES
054-074
TB2
TB2
14
5
SMOKE PURGE
22
EVACUATION
25
FIRE SHUTDOWN
28
Fig. 17 — Differential Enthalpy Sensor
Fig. 20 — Smoke Control
FIELD-SUPPLIED
24-V ISOLATED
POWER SUPPLY
24V
J7
16
9
+
1
INDOOR AIR
QUALITY ACY
LEGEND
DSIO — Relay Module
10 -
17
5
PSIO
NO. 2
Fig. 18 — Remote RUN/UNOCCUPIED Control
Fig. 21 — Indoor Air Quality
ACCESSORY
OUTSIDE AIR
RELATIVE HUMIDITY
GRA
PSIO NO. 2
CH. 33
VIO
2
FIELD-SUPPLIED
24-V ISOLATED
POWER SUPPLY
1
J2
24V
J1
2
1
FIELD-SUPPLIED
24-V ISOLATED
POWER SUPPLY
TB4
BLU
3
2
ORN
4
1
1
J2
CH. 34
LEGEND
J1
2
24V
SPACE/RETURN
RELATIVE HUMIDITY
TB — Terminal Block
Field Wiring
Component Terminal
Terminal Block Terminal
Field Splice
NOTE: TB4 located in auxiliary control box.
Fig. 19 — Accessory Humidity Control
37
TO 24-V
ISOLATED
TRANSFORMER
BRN
OUTDOOR
AIR
+
24V
RED
24V
-
PNK
BLK
PSIO
NO. 2
PSIO
NO. 2
CH. 35
J6
CFM ACY
+ 37
HYD VLV
LEGEND
TB — Terminal Block
Field Wiring
Component Terminal
- 38
HYDRONIC VALVE
ACTUATOR
Terminal Block Terminal
LEGEND
TB — Terminal Block
Field Wiring
Component Terminal
Fig. 22 — Outdoor Airflow Control
Fig. 25 — Hydronic Heating
PSIO NO. 2
J6
PSIO
NO. 2
41
J7
31
SIZES
034-048
SIZES
054-074
TB2
TB2
14
5
42
RELAY PART.
NO.HK35AB001
LEGEND
TB — Terminal Block
Field Wiring
Component Terminal
Fig. 23 — Timed Discrete Output
Terminal Block Terminal
Fig. 26 — Freezestat
PSIO
NO. 2
J6
+ 43
HUM VLV
HUMIDIFIER
ACTUATOR
HHR
HUMIDIFIER
RELAY
- 44
+ 45
CARRIER PART NO.
HK35AA001
LEGEND
TB — Terminal Block
Field Wiring
Component Terminal
LEGEND
CV — Constant Volume
VAV — Variable Air Volume
Fig. 27 — Remote Supply Air Temperature
Reset/Space Temperature Offset
Fig. 24 — Humidifier
38
PSIO NO. 1
TRANSDUCER ACCESSORY
_
J7
BLK
DPT1
WHT
WHT
+
RES
RED
_
RED
WHT
WHT
WHT
11
RED
_
10K OHM
1/2 WATT
+- 5%
BLK
BLK
SPT1
WHT
BRN
WHT
RED
14
BLK
_
10K OHM
1/2 WATT
+- 5%
BLK
RED
BLK
WHT
SPT2
DPT
RES
SPT
TB
3
9
4
10
LEGEND
Discharge Pressure
Transducer
— Resistor
— Suction Pressure
Transducer
— Terminal Block
Wire Nut
+
BRN
RED
WHT
16
RES
BLK
17
10K OHM
1/2 WATT
+- 5%
BLK
RED
J7
—
Wire Connector
13
RES
+
SIZES
034-048
TB3
10
RES
+
SIZES
054-074
TB2
8
10K OHM
1/2 WATT
+- 5%
BLK
DPT2
7
WHT
BLK
6
SUCTION GAS
TEMPERATURE 1
THERMISTOR
PSIO NO. 2
2
CHANNEL 31
3
SUCTION GAS
TEMPERATURE
THERMISTOR
7
2
CHANNEL 32
6
Fig. 28 — Transducer/Thermistor Wiring
PSIO
NO. 1
COMM
CCN NETWORK
_
_
LEVEL II
COMMUNICATIONS
BUS (COMM)
5
1
RED
1
2
GRN
2
3
BLK
3
4
COMM 1
Fig. 29 — CCN Building Supervisor
39
Timed Discrete Output — A timed discrete output is
available for switching on and off items such as parking lot
lights. Time Schedule II (
SCHD to
SCHD)
operates this function. A special relay (part no. HK35AB001)
with a 20 vdc holding coil must be field wired. See Fig. 23.
Air Pressure Tubing — Before options such as inlet
guide vanes (IGV), variable frequency drive (VFD), and/or
modulating power exhaust can operate properly, the pneumatic tubing for pressure sensing must be installed. Use fireretardant plenum tubing (field-supplied). Tubing size is
1⁄4 in. for all applications. Tubing must be run from the appropriate sensing location (in the duct or in the building space)
to the control device location in the unit.
INLET GUIDE VANES — The tubing for the duct pressure
(DP) control option should sample supply duct pressure about
2/3 of the way out from the unit in the main trunk duct, at
a location where a constant duct pressure is desired.
The duct pressure is sensed by a pressure transducer. The
output of the pressure transducer is directed to the unit control module. On all sizes, the DP transducer is located in the
unit auxiliary control box. See Fig. 30 and 31. Use a nominal 1⁄4-in. plastic tubing. Control box details are shown in
Fig. 32 and 33.
VARIABLE FREQUENCY DRIVE — The tubing for the
duct pressure (DP) control option should sample supply duct
pressure about 2/3 of the way out from the unit in the main
trunk duct, at a location where a constant duct pressure is
desired.
The duct pressure is sensed by a pressure transducer. The
pressure transducer output is directed to the unit control module. On all sizes the DP transducer is located in the unit auxiliary control box. See Fig. 30 and 31. Use a nominal 1⁄4-in.
plastic tubing. Control box details are shown in Fig. 32
and 33.
MODULATING POWER EXHAUST — The tubing for the
building pressure control (achieved via the Modulating Power
Exhaust option) should sample building pressure in the area
near the entrance lobby (or other appropriate and sensitive
location) so that location is controlled as closely to design
pressures as possible.
These units use a pressure transducer for sensing building
pressure. The BP transducer is located in the unit auxiliary
control box. See Fig. 30 and 31. Use a nominal 1⁄4-in. plastic
tubing. Control box details are shown in Fig. 32 and 33.
Fig. 30 — Auxiliary Control Box Location;
Size 034-048 Units
thermostat would be (in the conditioned space where it will
not be subjected to either a cooling or heating source or direct exposure to sunlight, and 4 to 5 ft above the floor). It
can also be used to override the occupancy schedule in the
unit by pushing the button on the front.
SPACE TEMPERATURE AVERAGING — Applications that
require averaging using multiple space temperature sensors
can be satisfied using either 4 or 9 T-55 sensors as shown in
Fig. 15. Single space temperature reset wiring is discussed
in detail in Space Temperature Sensor sections on page 34.
NOTE: Only Carrier T-55 sensors may be used for standard
T-55 space temperature averaging. Sensors must be used in
multiples of 1, 4 and 9 only, with total sensor wiring not to
exceed 1000 ft. However, space temperature reset can be accomplished with only one sensor (provided standard with
unit).
NOTE: Do not use T-56 sensor for space temperature averaging because 5° F offset function will not work in a multiple sensor application.
Humidity Sensors
RELATIVE HUMIDITY (RH) SENSOR (Wall Mounted) —
The accessory field-installed, wall-mounted type RH sensor
(part no. HL39ZZ001) measures the relative humidity of the
air within the occupied space. Use a junction box to accommodate the wiring when sensor is mounted in the occupied
space. Sensor must be mounted with terminals ACIN and
OUT1 located at the top of the sensor. Supply 24 vac to this
sensor from an isolated power supply. The control options
module (PSIO2) is required for operation.
RELATIVE HUMIDITY (RH) SENSOR (Duct Mounted) —
The accessory field-installed, duct-mounted RH sensor (part
no. HL39ZZ002) can be installed either in the return-air ductwork or the outdoor-air ductwork. If 2 relative humidity sensors are ordered for differential enthalpy control, then the
sensors will be installed in the conditioned space (CV applications) or the return air (VAV applications) and outdoor
airstream. If the sensor is to be used for control of a humidifier, install the sensor in the return-air duct. Supply
24 vac to this sensor from an isolated power supply. The
control options module (PSIO2) is required for operation.
Space Temperature Sensors
STANDARD SPACE TEMPERATURE SENSOR (T-55) —
The T-55 (part no. CEC0121448-01) sensor is a wallmounted device used to measure space temperature and for
unoccupied heating and cooling operation. It should be installed as a wall-mounted thermostat would be (in the conditioned space where it will not be subjected to either a cooling or heating source or direct exposure to sunlight, and 4 to
5 ft above the floor). It can also be used to override the occupancy schedule in the unit by pushing the button on the
front. Refer to Space Temperature Sensor (T-55) section on
page 34 for wiring details.
ACCESSORY SPACE TEMPERATURE SENSOR (T-56) —
The T-56 sensor (part no. CEC0121503-01) operates the same
as the standard T-55 sensor but has an additional feature of
allowing the user to change the set point 6 5° F. The T-56
sensor is applicable to CV applications only. A slide potentiometer is used to provide the space temperature offset and
is located on the face of the device. The sensor is a wallmounted device and should be installed as a wall-mounted
40
Fig. 31 — Auxiliary Control Box Location; Size 054-074 Units
LEGEND
BP
DP
PL
PS
Fig. 32 — Auxiliary Control Box Details; Size 034-048 Units
41
—
—
—
—
Building Pressure
Duct Pressure
Plug
Pressure Switch
BP
CF
DP
FS
PECB
PEC
—
—
—
—
—
—
LEGEND
Building Pressure
PER
Check Filter
PS
Duct Pressure
RFC
Fan Status
RFCB
Power Exhaust Circuit
TB
Power Exhaust Contactor
—
—
—
—
—
Power Exhaust Relay
Pressure Switch
Return Fan Contactor
Return Fan Circuit Breaker
Terminal Block
Fig. 33 — Auxiliary Control Box Details; Size 054-074 Units
CARRIER COMFORT NETWORK INTERFACE
IMPORTANT: When connecting the CCN communication bus to a system element, use a color coding system for the entire network to simplify installation and
checkout.
The units can be connected to the CCN if desired. The
communication bus wiring is supplied and installed in the
field. It consists of shielded, 3-conductor cable with drain
wire.
The system elements are connected to the communication
bus in a daisy chain arrangement. The positive pin of each
system element communication connector must be wired to
the positive pins of the system element on either side of it,
the negative pins must be wired to the negative pins, and the
signal pins must be wired to signal ground pins. Wiring connections for CCN should be made at the 4-pin plug (COMM)
located at the bottom right side of the fuse bracket in the
main control box. Consult CCN Contractor’s Manual for further information.
NOTE: Conductors and drain wire must be 20 AWG minimum stranded, tinned copper. Individual conductors must be
insulated with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An aluminum/polyester 100% foil shield and an outer
jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a
minimum operating temperature range of 220 C to 60 C is
required. See Table 41 for cables that meet the requirements.
The following color code is recommended:
SIGNAL
TYPE
1
GROUND
2
COMM1 PLUG
PIN NO.
1
2
3
NOTE: If a cable with a different color scheme is selected,
a similar color code should be adopted for the entire
network.
At each system element, the shields of its communication
bus cables must be tied together. If the communication bus
is entirely within one building, the resulting continuous shield
must be connected to a ground at one point only. If the communication bus cable exits from one building and enters another, the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or
exits the building (1 point per building only). See Fig. 34.
To connect the unit to the network:
1. Turn off power to the control box.
2. Cut the CCN wire and strip the ends of the red (1), white
(ground), and black (2) conductors. (If a different network color scheme is used, substitute appropriate
colors.)
Table 41 — CCN Connection Approved
Shielded Cables
MANUFACTURER
Alpha
American
Belden
Columbia
CCN BUS CONDUCTOR
INSULATION COLOR
RED
WHITE
BLACK
CABLE PART NO.
2413 or 5463
A22503
8772
02525
42
connector, if desired. To wire the RJ11 connector into the
CCN (Fig. 35):
3. Remove the 4-pin female plug from the fuse and control
circuit breaker bracket in the main control box, and connect the wires as follows:
a. Insert and secure the red (1) wire to terminal 1 of the
4-pin plug.
b. Insert and secure the white (ground) wire to terminal
2 of the 4-pin plug.
c. Insert and secure the black (2) wire to terminal 3 of
the 4-pin plug.
4. Insert the plug into the existing 4-pin mating connector
on the fuse or control circuit breaker bracket in the main
control box.
IMPORTANT: The cable selected for the RJ11 connector wiring MUST be identical to the CCN communication bus wire used for the entire network. Refer to
Table 41 for acceptable wiring.
1. Cut the CCN wire and strip ends of the red (1), white
(ground), and black (2) conductors. (If another wire color
scheme is used, strip ends of appropriate wires.)
2. Insert and secure the red (1) wire to pin J2 of the space
temperature sensor terminal block (TB1).
3. Insert and secure the white (ground) wire to pin J3 of the
space temperature sensor TB1.
4. Insert and secure the black (2) wire to pin J5 of the space
temperature sensor TB1.
5. Connect the other end of the communication bus cable to
the remainder of the CCN communication bus at the
COMM1 plug located on the fuse and control circuit breaker
bracket in the unit main control box.
IMPORTANT: A shorted CCN bus cable will prevent
some routines from running and may prevent unit from
starting. If abnormal conditions occur, unplug the connector. If conditions return to normal, check CCN connector, and run new cable if necessary. A short in one
section of the bus can cause problems with all system
elements on the bus.
RJ11 Plug Wiring — Units on the CCN can be monitored from the space at the sensor through the RJ11
LEGEND
PIC — Product Integrated Control
Fig. 34 — CCN Communication Wiring
43
LEGEND
CCN
— Carrier Comfort Network
COM
— Common
COMM — Communications
GND
— Ground
SW
— Switch
T
— Terminal
TH
— Thermostat, Heating
*Constant volume applications only.
Fig. 35 — Space Sensor to Communication Bus Wiring
Set Fan Status and Check Filter Switches
START-UP
SUPPLY FAN STATUS SWITCH (FS) — A snap-acting singlepole, double-throw (SPDT) differential pressure switch is factory mounted in the unit auxiliary control box. The switch
senses the change in pressure across the supply-air fan and
provides the fan status. A length of fire-retardant control (plenum) tubing connects the switch to the probe located in the
fan discharge plenum.
The switch must be set prior to unit operation. To set the
switch, turn the adjustment screw on top (center) of switch
clockwise to increase set point, or counterclockwise to
decrease set point. The set point switch range is 0.05 to
2.0 in. wg with a deadband of 0.02 in. wg at minimum set
point and 0.1 in. wg at maximum set point.
Set switch so that contact makes to NC when supply-air
fan is energized. Adjust switch with VFD at slow speed on
VAV units. If IGVs are used, adjust switch with IGVs closed.
The switch should make (fan on) within 1 minute after supplyair fan is energized and break (fan off) within 1 minute after
the fan is deenergized.
CHECK FILTER SWITCH (CFS) — A snap acting SPDT
switch is factory mounted in the unit auxiliary control box.
The switch senses the differential pressure and provides the
microprocessor module with a signal for filter status. Two
lengths of plenum tubing connect the switch to probes located both upstream and downstream of the unit filters.
The switch must be set prior to unit operation. To set the
switch, turn the adjustment screw on top (center) of switch
slowly clockwise to find the ‘‘pivot’’ point where the filter
status still reads clean under
in the HSIO display.
Check the switch operation with the supply-air fan running,
the VFD at slow speed (if applicable), and nominal cfm delivery. If IGVs are used, adjust switch with IGVs closed. See
Table 42 for clean filter pressure drops for help in locating
the ‘‘pivot’’ point. Once this point is found, turn the screw
clockwise to obtain the set point at which the filter status
will be dirty. Use Table 42 as a guide.
Initial Check
IMPORTANT: Do not attempt to start unit, even momentarily, until all items on the Controls Start-Up Checklist (in installation instructions) and the following steps
have been completed.
1. Verify unit has been installed per the Installation Instructions included in the unit installation packet.
2. Verify that all auxiliary components (sensors, controls,
etc.) have been installed and wired to the unit control boxes
per these instructions, the unit Installation Instructions,
and the unit wiring label diagrams.
3. Verify that air pressure hoses (static, duct, etc.) are properly attached, routed, and free from pinches or crimps that
may affect proper control operation.
4. Set any control configurations that are required (fieldinstalled accessories, etc). The unit is factory configured
for all appropriate factory-installed options with the applicable controls programmed to the default values. See
Adjusting Set Points section on page 46 for configuration
values.
5. Enter unit set points. The unit is shipped with the set point
default values shown in Adjusting Set Points section on
page 46. If a different set point is required, change per the
example shown under Set Point Function section on
page 46.
6. Configure schedule subfunctions: occupied, unoccupied,
and holiday periods. See Program Time Sequences section on page 50 for details on setting periods.
7. Verify that control time periods programmed meet current requirements.
8. Check tightness of all electrical connections.
9. Perform quick test (see Quick Test section on page 79).
44
Table 42 — Filter Switch Set Point
FILTER TYPE
2-in. Throwaway
2-in. Pleated
Bag With Pre-filters
INCREASED
PRESSURE DROP
TO ‘‘DIRTY’’
FROM PIVOT POINT
0.30 in. wg
0.75 in. wg
0.75 in. wg
6. Repeat the quick test.
7. Repeat Steps 5 and 6 as necessary until proper operation
is observed.
8. Replace damper motor top cover.
APPROXIMATE
CLOCKWISE
TURNS
2
5
5
Auxiliary Switch, Power Exhaust — All units with
the modulating power exhaust option have 2 auxiliary switches
mounted on the cams inside the power exhaust damper motor. The switch cam is factory set to energize the second power
exhaust motor. A pointer is printed on the red cam and the
numbers 35 and 63 are both printed on the blue cam. See
Fig. 36.
If the damper motor has been replaced or improper operation is suspected, perform the following test before attempting to adjust the switch cams:
1. Put the unit into the standby mode.
2. a. For size 034-048 units: Remove damper motor top cover
and verify that pointer points at number 35. If installing new motor, use screwdriver to turn blue
cam so pointer lines up with the number 35. See
Fig. 37.
b. For size 054-074 units: Remove damper motor top cover
and verify that pointer points at number 63. If installing new motor, use screwdriver to turn blue cam so
that pointer lines up with the number 63. See Fig. 37.
3. Enter quick test function (
) and press
until
you reach the PERD display.
4. Press the
5.
6.
7.
8.
9.
ENTER
Fig. 36 — Auxiliary Switch Stroke Adjustment
key once and wait 30 seconds. Was power
exhaust motor no. 2 energized? Yes/No
Press the ENTER key again and wait 30 seconds. Was power
exhaust motor no. 2 energized? Yes/No
Press the ENTER key again and wait 30 seconds. Was power
exhaust motor no. 2 deenergized? Yes/No
Press the ENTER key again and wait 30 seconds. Was power
exhaust motor no. 2 deenergized? Yes/No
Exit the quick test. See Quick Test section on page 79
for details.
Proceed with evaluation below.
If the answers in Step 5 and Step 7 above were both yes,
the switch cams are properly adjusted. If the answers to either Step 4 or Step 6 above were yes, the switch cams need
adjustment. To adjust auxiliary switch cams:
1. Remove damper motor top cover.
2. Use 1⁄8 in. straight blade screwdriver to make adjustments.
Do not turn motor shaft by hand or with wrench.
Damage to the gear train will result.
3. Adjustments should be made to the blue cam only. The
pointer on the red cam should remain centered and at the
top, as this will deenergize motor no. 2 properly.
4. Each click of the blue cam changes the switch setting by
approximately 3 degrees of travel.
5. If motor no. 2 was energized too soon (Step 4 of the test
above was yes), turn blue cam one click to left (see
Fig. 37). If motor no. 2 was not energized (Steps 4 and
5 of the test above were no), turn blue cam one click to
the right (see Fig. 37).
Fig. 37 — Auxiliary Switch Adjustment
45
6. Press
to change to the demand limit set point
function.
7. Press
once to change the display to LSP 50 (the
default value).
ENTER , and the display will change to LSP 60.
8. Press
The unit will reduce capacity to 60% when the loadshed command is in effect.
Adjusting Set Points
SET POINT FUNCTION — The Set Point function allows
the user to view the current values set for the unit. From this
function, the user can change the values. See Table 43.
Reading and Changing Set Points — To change the set point
of a particular feature, enter the appropriate subfunction and
scroll to the variable desired. Once the desired variable has
been reached, type in the new value and press ENTER . The
new value will appear in the display.
For example, the occupied cool set point is currently set
at the default value of 78 F. To change the occupied set point
to 72 F:
1. Press
to enter the occupied cool set point
function. The display will read OCSP 78.
ENTER and the display will read OCSP 72.
2. Press
(Time) — The current time is displayed once the
subfunction has been accessed. Press the
key to scroll
to the next display which will be the day of week and time.
The day of the week is entered as a number:
1 = Monday
2 = Tuesday
3 = Wednesday
4 = Thursday
5 = Friday
6 = Saturday
7 = Sunday
Set points can be changed by the user provided that the
values are within the allowable range for the input. If the
input is not within the allowable range, the original value
will remain displayed. See Table 44A and 44B for allowable
ranges and default values.
To change the demand limit set points, the functions must
first be enabled in the field configuration subfunction. (See
Table 45 for more details on operation modes.)
Time is entered in military time format using a 24-hour
clock (9:00 PM = 21:00), with
used as a colon.
Press
to scroll to the next display (the current
date in month, date, and year format). The month is also
entered as a number: 1 = January, 2 = February...12 =
December.
In the following example, the day, time, and date will be
set. Assume the current date is May 15, 1998, the day is
Friday, and the time is 4:45 p.m.
(Set point) — The system set point subfunction displays the occupied and unoccupied heat and cool set points,
as well as the static pressure, supply air, and humidity set
points.
(Loadshed set point) — This subfunction displays
the loadshed set point (in percent of unit capacity).
1. Press
to enter the day, date, and time subfunction. The display will read TIME.
The demand limit/loadshed feature is activated by a redline alert and loadshed commands from the CCN loadshed
option. Before any set points can be changed for demand
limit, the user must first log into the system. Refer to example below for details on how to log in.
2. Press
to scroll down until the current day of the
week and time programmed into the processor is
displayed.
ENTER
3. Press
for Friday
4:45 p.m. The display should read, FRI 16.45.
To disable demand limit:
1. Press
2. Press
for the user configuration.
4. Press
to scroll down until the current date programmed into the processor is displayed.
to scroll down until the display reads DLEN.
ENTER to disable the demand limit option. The
3. Press
display now reads DLEN DSB.
5. Press
for May 15, 1998.
The display should read MAY 15 98.
To use demand limit, first enable the demand limit option
(see example below), and then enter the loadshed set point.
NOTE: The demand limit function must be enabled in order
to function and may be turned off when its operation is not
desired.
In the following example, demand limit will be enabled,
and the loadshed set point will be set at 60% of available
capacity.
1. Press
.
2. Press
ENTER
3. Press
. The
CONFIGURATION.
(Daylight savings time) — This subfunction reads
and displays daylight savings time.
The month, the day of week, and the time of the day are
entered as explained in
above. Refer to Table 46.
(Holiday periods) — The holiday configuration can
set up to 18 Holiday periods for one calendar year. When
the calendar year changes, the holidays must be reconfigured for the new year.
. (This is the login command.)
display
will
read
at
IMPORTANT: Because each new year has different holiday and daylight savings time dates, the holiday and
daylight savings time periods must be reprogrammed
each year.
USER
4. Press
to scroll down until the display reads DLEN
DSB.
ENTER to change the demand limit selection. This
5. Press
will change the display to DLEN ENB; enabling loadshed control.
46
Table 43 — Set Point Directory
SET POINT
Subfunction
1 SET POINTS
Keypad Entry
Display
SET POINT
OHSP X
Comment
System set points
Occupied heat set point X
OCSP X
Occupied cool set point X
UHSP X
Unoccupied heat set point X
UCSP X
Unoccupied cool set point X
SPSP X
Static pressure set point X
SASP X
Supply air set point X
HUSP X
Humidity set point X
HCFO X
Heat Coil Fan On/Off X
2 DEMAND SET
POINTS
DEMAND
Demand limit set points
LSP X
Loadshed set point X
3
DATE AND TIME
TIME
Current time
dow.hh.mm
4
DAYLIGHT SAVINGS
TIME
5
HOLIDAY TIMES
LEGEND
dd — Day
dur — Duration
mm — Month
47
Day of Week and Time
mm.dd.yy
Month, Day and Year
DAYLIGHT
Daylight savings time
ENM X
Daylight enter month X
END X
Daylight enter day X
ENT hh.mm
Daylight enter time X
LVM X
Daylight leave month X
LVD X
Daylight leave day X
LVT hh.mm
Daylight leave time X
HOLIDAY
Holiday configuration
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
mm.dd.dur
Holiday mm.dd.dur days long
Table 44A — Set Point Ranges and Defaults (English Units)
DISPLAY
BPSP
ECSO*
HHOR†
HTMP
HUSP
IAQS†
LIMT†
LSP
LTMP
MDP†
NTLO†
OACS†
OCSP
OHSP
PES1†
PES2†
RTIO†
SASP
SPSP
UCDB*
UCSP
UHDB*
UHSP
IAQ
NFTC
PPM
VAV
—
—
—
—
LEGEND
Indoor-Air Quality
Nighttime Free Cooling
Parts Per Million
Variable Air Volume
SET POINT
DESCRIPTION
Building pressure set point
Economizer set point offset
High humidity override (percent)
High temperature minimum position
Humidity set point (percent)**
IAQ set point
Reset limit (F)
Loadshed set point (percent)
Low temperature minimum position
Minimum damper position (percent)
NTFC lockout temperature (F)
Outdoor-air cfm set point
Occupied cool set point (F)**
Occupied heat set point (F)**
Power exhaust on-set point 1 (percent)
Power exhaust on-set point 2 (percent)
Reset ratio
Supply air set point (F)
Static pressure set point††
Unoccupied cooling deadband
Unoccupied cool set point (F)**
Unoccupied heating deadband
Unoccupied heat set point (F)**
DEFAULT
VALUE
0.05 in. wg
3F
99%
35%
40%
650 ppm
10 F
50%
10%
20%
50 F
1 cfm
78 F
68 F
90%
90%
3
55 F
1.5 in. wg
1F
90 F
1F
55 F
ALLOWABLE
RANGE
0 to .50 in. wg
1 to 10 F
0 to 100%
0 to 100%
0 to 100%
0 to 5000 ppm
0 to 20 F
0 to 100%
0 to 100%
0 to 100%
40 to 70 F
0 to 50,000 cfm
55 to 80 F
55 to 80 F
30 to 100%
30 to 100%
0 to 10
45 to 70 F
0 to 5.0 in. wg
0 to 10 F
75 to 95 F
0 to 10 F
40 to 80 F
*These items are found under the Service function, and can only be accessed using either the Building
Supervisor or Service Tool.
†These items are found under the Service function.
**Occupied space.
††Supply duct.
NOTE: For VAV applications, the OHSP provides the morning warm-up set point.
Table 44B — Set Point Ranges and Defaults (SI Units)
DISPLAY
BPSP
ECSO*
HHOR†
HTMP
HUSP
IAQS†
LIMT†
LSP
LTMP
MDP†
NTLO†
OACS†
OCSP
OHSP
PES1†
PES2†
RTIO†
SASP
SPSP
UCDB*
UCSP
UHDB*
UHSP
IAQ
NFTC
PPM
VAV
—
—
—
—
LEGEND
Indoor-Air Quality
Nighttime Free Cooling
Parts Per Million
Variable Air Volume
SET POINT
DESCRIPTION
Building pressure set point
Economizer set point offset
High humidity override (percent)
High temperature minimum position
Humidity set point (percent)**
IAQ set point
Reset limit (F)
Loadshed set point (percent)
Low temperature minimum position
Minimum damper position (percent)
NTFC lockout temperature (F)
Outdoor-air cfm set point
Occupied cool set point (F)**
Occupied heat set point (F)**
Power exhaust on-set point 1 (percent)
Power exhaust on-set point 2 (percent)
Reset ratio
Supply air set point (F)
Static pressure set point††
Unoccupied cooling deadband
Unoccupied cool set point (F)**
Unoccupied heating deadband
Unoccupied heat set point (F)**
DEFAULT
VALUE
12.44 Pa
1.7 C
99%
35%
40%**
650 ppm
5.6 C
50%
10%
20%
10.0 C
1 cfm ¶
25.6 C**
20 C**
90%
90%
3
12.8 C
373 Pa††
0.6 C
32.2 C**
0.6 C
12.8 C**
ALLOWABLE
RANGE
0 to 125 Pa
0.6 to 5.6 C
0 to 100%
0 to 100%
0 to 100%
0 to 5000 ppm
0 to 11.1 C
0 to 100%
0 to 100%
0 to 100%
4.4 to 21.0 C
0 to 50,000 cfm ¶
13 to 27 C
13 to 27 C
30 to 100%
30 to 100%
0 to 10
7.2 to 21 C
0 to 1246 Pa
0 to 5.6 C
24 to 35 C
0 to 5.6 C
4.4 to 27 C
*These items are found under the Service function, and can only be accessed using either the Building
Supervisor or Service Tool.
†These items are found under the Service function.
**Occupied space.
††Supply duct.
¶ HSIO display reads in units of CFM. Service tool will read in units of cubic meters/minute; default is
0.03 m3/m with range of 0 to 1416 m3/m.
NOTE: For VAV applications, the OHSP provides the morning warm-up set point.
48
Table 45 — Operating Modes
TO CONFIGURE OPTION
Press
Display
TO ENABLE MODE
Press*
Display
MODE
NO.
OPERATING
MODE
21
Space Temperature Reset
SPCRESET
RSEN ENB
22
Demand Limit
LOADSHED
DLEN ENB
23
Unoccupied Heating
HEATCOIL
(MODULATING)
HEAT
(STAGED)
24
Unoccupied Cooling
—
—
—
—
COOLING
ECONMIZR
25
Standby
26
—
STBY YES
Optimal Start
AOSS
OSEN ENB
27
Unoccupied
PERIOD 1
28
IAQ Purge
IAQ
PURG ENB
29
Optimal Stop
AOSS
OSEN DSB
30
Occupied Heating
HEATCOIL
(MODULATING)
HEAT
(STAGED)
OHEN ENB
31
Occupied Cooling
COOLING
—
—
32
Occupied Fan Only
PERIOD 1
—
—
33
Nighttime Free Cooling
NTFC
34
35
36
37
Pressurization
Evacuation
Smoke Purge
Fire Shutdown
38
Timed Override
—
—
NTEN ENB
See Table 24 for details.
From: HSIO or Building
Supervisor
OVRD XHR
From: T-55 or T-56
39
DAV Control
40
Factory/Field Test
41
High Humidity Override
—
through
TEST
—
—
—
—
HHL X
LEGEND
—
— Not Applicable
DSB — Disabled
ENB — Enable
*Press
—
until desired display appears once you have accessed the correct function.
49
TSCH v
TOVR v
—
INPUTS
through EXIT
HUSN X
Table 46 — Setting Daylight Savings Time
KEYBOARD ENTRY
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
DISPLAY
DAYLIGHT
COMMENTS
Daylight savings time field configuration of set
point function
ENM X
Month when daylight savings time begins
ENM 4
Daylight savings time configured to start month 4
(April)
END X
Day of month when daylight savings time begins
END 16
Daylight savings time configured to start on the
16th of the month
ENT X
Time of day when daylight savings time begins
ENT 2.00
Daylight savings time configured to start at 2:00 a.m.
on the 16th of April
LVM X
Month when daylight savings time ends
LVM 11
Daylight savings time configured to end month 11
(November)
LVD X
Day of month when daylight savings time ends
LVD 12
Daylight savings time configured to end on the
12th of November
LVT X
Time of day when daylight savings time ends
LVT 2.00
Daylight savings time configured to end at 2:00 a.m.
on November 12
through
(Occupied and Unoccupied schedules) — In this subfunction, the occupied and unoccupied
times and days are scheduled.
In the following example, the building occupancy is on a
set point schedule. There are 5 periods of time that must be
programmed.
1. Period 1 is a 3-hour off-peak cool-down period from midnight to 3:00 a.m. following the weekend shutdown.
2. Period 2 is scheduled for Monday and Tuesday from
7:00 a.m. to 6:00 p.m.
3. Period 3 is scheduled for Wednesday, 7:00 a.m. to
9:30 p.m.
4. Period 4 is scheduled for Thursday and Friday from
7:00 a.m. to 5:00 p.m.
5. Period 5 is scheduled for Saturday from 7:00 a.m. to
12:00 p.m.
To program this schedule:
NOTE: This is an example of a schedule. Each application
will require its own schedule that should be determined by
the building load.
To Program Period 1:
Program Time Sequences
SCHEDULE FUNCTION — Two schedules are provided
with the unit controls. Schedule I provides a means to automatically switch the unit from an Occupied mode to an
Unoccupied mode. Schedule II provides a means to automatically change the optional discrete output (such as outdoor building or parking lot lights) from occupied to unoccupied mode. See Table 47.
Each schedule consists of from 1 to 8 occupied time periods set by the operator. These time periods can be flagged
to be in effect or not in effect on each day of the week.
1. To flag a day for operation on that schedule, press
ENTER .
ENTER .
2. To change a flag to NO, press
The day begins at 00.00 and ends at 24.00. The unit is in
Unoccupied mode unless a scheduled time period is in effect
or an override period is in effect.
IMPORTANT: If an Occupied mode is to extend past
midnight, it must be programmed in the following manner: occupied period must end at 24.00 hours (midnight), and a new occupied period must be programmed
to begin at 00.00 hours.
1. Press
to enter the period 1 subfunction. The display will read PERIOD 1.
(Override) — The time schedule can be overridden
to keep the unit in the occupied mode for between 1 and 4
hours on a one-time basis.
To override the unoccupied schedule, press
and the display will read OVRD OHR. Press the number of
hours of override desired followed by ENTER . For example,
ENTER ; changing the disfor 3 hours of override, press
play to OVRD 3HR.
NOTE: Only whole numbers can be used.
ENTER and the display will
To cancel the override, press
change back to the default display (OVRD OHR).
2. Press
3. Press
4. Press
5. Press
to scroll down to OCC (occupied time).
ENTER
for midnight.
to scroll down to UNO (unoccupied time).
ENTER
for 3:00 a.m.
Next are the flags for each day.
6. Press
to move to MON (Monday). Suppose
that the display reads MON NO. To change the flag so
ENTER , and the
that this period will be in effect, press
display will change from MON NO to MON YES.
50
NOTE: If the unit is connected to a DAV system, the unit
time schedule is ignored. The time schedule should still be
entered into the unit in case communications are lost with
the network.
7. Scroll through the rest of the days (press
) to
to be sure that no other days have been flagged.
Suppose, for this example, Tuesday was flagged for this
period. To change this period from YES to NO, press
ENTER ,
and the display will change to TUE NO.
Start Unit
To Program Period 2:
1. Press
to enter the period 2 subfunction. The display will read PERIOD 2.
2. Press
to scroll down to OCC.
3. Press
ENTER
4. Press
to scroll down to UNO.
5. Press
1. Put the ON/OFF switch in the ON position. Close the control circuit breaker (CCB), which will energize the control circuit and the crankcase heaters.
2. Using the HSIO keypad or building supervisor, verify that
no alarms have been detected.
3. Ensure that quick test has been performed to make sure
controls are operating properly. Refer to Quick Test section on page 79 for instructions on quick test.
4. Using the HSIO keypad, put unit into the run mode:
a. Press
.
for 7:00 a.m.
ENTER
for 6:00 p.m.
Next are the flags for each day.
6. Press
to move to MON. Suppose that the display
reads MON NO. To change the flag so that this period
ENTER
will be in effect, press
, and the display will
change to MON YES.
7. Scroll through the rest of the days to flag Tuesday for this
schedule and be sure that no other days have been flagged.
b. Press
c. Press
to scroll down to OCC.
3. Press
ENTER
4. Press
to scroll down to UNO.
5. Press
. This will put unit in ‘‘RUN’’ mode.
Operating Sequences
SUPPLY FAN
VAV Units — During Occupied periods, the control will energize the supply fan contactor. The contactor will close, energizing supply fan motor. Fan wheel will turn. Airflow Switch
(differential pressure switch) contacts close, providing discrete input (DI) to Channel 12 (Closed = Fan ON). Fan operation will continue through the Occupied period.
During Unoccupied period with demand, the control will
energize fan contactor when demand is sensed. After fan status is confirmed, operating routines will start. When demand
is removed, routines will end and fan will shut off.
CV Units, Continuous Fan — During Occupied periods, the
control will energize the supply fan contactor. The contactor
will close, energizing supply fan motor. Fan wheel will turn.
Airflow Switch (differential pressure switch) contacts close,
providing discrete input (DI) to Channel 12 (Closed = Fan
ON). Fan operation will continue through the Occupied
period.
During Unoccupied period with demand, the control will
energize fan contactor when demand is sensed. After fan status is confirmed, operating routines will start. When demand
is removed, routines will end and fan will shut off.
CV Units, Automatic Fan — Fan will be turned OFF during
Occupied period when there is no demand for heating or cooling operation. When demand is sensed, control will energize
fan contactor and initiate cooling cycle. Fan status will be
confirmed. When demand is removed, routines will terminate and fan will be shut off.
for 7:00 a.m.
ENTER
CLEAR
d. Press
and the unit changes status from mode
25 (standby) to mode 32 (occupied) or mode 27 (unoccupied), depending on the programmed time schedule. When the unit receives a call for cooling or heating (either from the internal control or the CCN Network command), the unit will initiate activity to meet
the respective set point value.
To Program Period 3:
1. Press
to enter the period 3 subfunction. The display will read PERIOD 3.
2. Press
.
for 9:30 p.m.
Next are the flags for each day.
6. Press
to move to MON. Suppose the display reads
MON YES. To change the flag so that this period
ENTER , and the display will
will not be in effect, press
change to MON NO. Do the same for Tuesday. Scroll
through the rest of the days to flag Wednesday for this
schedule and be sure that no other days have been flagged.
To Program Periods 4 and 5: These can be programmed in
the same manner as above, flagging Thursday and Friday
yes for period 4 and Saturday yes for period 5.
To Program Periods 6, 7, and 8: Since these schedules are
not used in this example, they should be programmed for
OCC 00.00 and UNO 00.00.
NOTE: When a day is flagged yes for 2 overlapping periods,
occupied time will take precedence over the unoccupied
time. Occupied times can overlap in the schedule with no
consequence.
The same scheduling procedures can be used to set optional discrete output schedule II. Subfunctions
through
define the schedule of the rooftop unit (schedule I).
Subfunction
provides the override for schedule II.
Subfunctions
through
define schedule of optional discrete output (schedule II).
51
Table 47 — Schedule Directory
Subfunction
1 OVERRIDE
Keypad Entry
2 PERIOD 1
PERIOD 1
3 PERIOD 2
4 PERIOD 3
5 PERIOD 4
6 PERIOD 5
7 PERIOD 6
8 PERIOD 7
9 PERIOD 8
—
Comments
Number of Override Hours (0 to 4 Hours);
Schedule I
Period 1; Time Schedule I
OCC HH.MM
Occupied Time
UNO HH.MM
Unoccupied Time
MON X
Monday Flag
TUE X
Tuesday Flag
WED X
Wednesday Flag
THU X
Thursday Flag
FRI X
Friday Flag
SAT X
Saturday Flag
SUN X
Sunday Flag
HOL X
Holiday Flag
PERIOD 2
Period 2; Time Schedule I
PERIOD 3
Same as Period 1
Subfunction
Period 3; Time Schedule I
PERIOD 4
Same as Period 1
Subfunction
Period 4; Time Schedule I
PERIOD 5
Same as Period 1
Subfunction
Period 5; Time Schedule I
PERIOD 6
Same as Period 1
Subfunction
Period 6; Time Schedule I
PERIOD 7
Same as Period 1
Subfunction
Period 7; Time Schedule I
PERIOD 8
Same as Period 1
Subfunction
Period 8; Time Schedule I
OVRD XHR
10 OVERRIDE
11 through 18
PERIOD 1 through
PERIOD 8
SCHEDULE
Display
OVRD xHR
PERIOD 1 —
PERIOD 8
Same as Period 1
Subfunction
Number of Override Hours
(0 to 4 Hours); Schedule II
Period 1 through Period 8;
Time Schedule II
Configure same as Period 1
subfunction, Time Schedule I
52
2. Master Loop will survey occupancy status, Supply Air
Set Point (SASP), and any Supply Air Temperature Reset
command, then issue Cooling Coil Submaster Reference
(CCSR) to Cooling Submaster Loop (CSL).
3. The CSL surveys actual SAT, then calculates number of
capacity stages required to produce the CCSR leaving the
unit.
4. Stages of cooling capacity are initiated. From zero stages,
there will be a 1.5 to 3 minute delay before the first stage
is initiated. The time delay between stages in increasing
demand is 90 seconds.
5. As actual SAT approaches CCSR value, stages are released. The minimum time delay between stages on decreasing demand is 90 seconds.
NOTE: Demand for heating has priority and Master Loop
will either terminate existing or prevent initiation of Cooling Cycle by issuing a CCSR at the maximum limit. This
will cause the CSL to select zero stages of cooling capacity,
initiating a stoppage of an existing cooling cycle.
CV Units — Supply fan must be ON for cooling control to
operate. Sequence is as follows:
1. Master Loop will survey space temperature and space temperature offset inputs, then calculate CCSR value.
2. The CSL surveys actual SAT, then calculates number of
capacity stages required to satisfy space load.
3. Stages of cooling capacity are initiated. (From zero stages,
there will be a 1.5 to 3 minute delay before first stage is
initiated.)
UNOCCUPIED COOLING — The unoccupied cooling sequence of operation is similar to Occupied Cooling (see above)
except for the following:
1. Supply Fan will be OFF as demand is initiated.
2. The Master Loop will start Supply Fan and cooling cycle.
Fan status must be proved as ON within 2 minutes to continue with cooling operation.
3. Control set point will be Unoccupied Cooling Set Point
(UCSP).
4. At end of cooling cycle, Supply Fan will be turned OFF.
OVERRIDES
First Stage and Slow Change Override — The first stage override reduces cycling on the first stage of capacity, and the
slow change override prevents the addition or subtraction of
another stage of capacity if the SAT is close to the set point
and gradually moving towards the set point.
Low Temperature Override — This override function protects against rapid load decreases by removing a stage every
30 seconds when required based on temperature and the temperature rate of change.
High Temperature Override — This override function protects against rapid load increases by adding a stage once every 60 seconds as required, based on temperature and temperature rate of change.
ADAPTIVE OPTIMAL START — Optimal start is used to
heat up or cool down the space prior to occupancy. The purpose is to have the space temperature approach and then achieve
the occupied set point by the time of occupancy. The control
utilizes outdoor-air temperature, space temperature, occupied set point, and a ‘‘K’’ factor. The ‘‘K’’ factor is expressed in minutes per degree, and calculates a start time
offset, which is the time in minutes that the system shall be
started in advance of the occupied time. The control monitors its results and adjusts the ‘‘K’’ factor to ensure that the
occupied set point is achieved at time of occupancy rather
than too early or too late.
ECONOMIZER — The economizer control loop will be delayed 2 minutes after the supply fan is turned ON, to allow
system and temperatures to stabilize before starting control.
When coming out of STANDBY or Heating mode, a 4-minute
delay will occur before the economizer damper is controlled. During this delay, damper position is limited to CLOSED
or MINIMUM position (depending on current unit occupancy status).
If fan status is OFF, the outside air dampers will remain
closed (return air dampers will be open). If fan status is ON,
the outside air dampers will normally be at minimum damper
position.
Economizer operation is permitted if the system is not in
Heating mode, if outdoor air enthalpy (via switch or humidity differential) is acceptable, and if outside-air temperature
is less than space temperature.
If economizer operation is permitted, the economizer control loop checks for Cooling System operation. If ON, the
outside air dampers will be driven to maximum position.
If cooling is not on, for VAV units, the economizer will
modulate to satisfy the supply air set point.
If cooling is not on, for CV units, the economizer will
modulate to satisfy the space temperature set point.
If Economizer operation is not permitted, the outside air
dampers will be driven to minimum position (during Occupied period) or closed (during Unoccupied period).
For VAV units, Economizer operation is not permitted
when Occupied Heating is enabled and the Return Air Temperature is LESS THAN (OHSP + 1° F).
COOLING (All Units) — The controls try to control the
supply-air temperature (SAT) to the value specified by the
supply-air temperature set point by cycling the compressors
and the unloader(s). Both the supply- and return-air temperature sensors are used to adjust the cycling deadband to
match the actual load. The control system provides cooling
capacity control of up to 6 stages to maintain supply-air temperature (VAV) or space temperature (CV) to an
occupied or unoccupied set point. Automatic lead-lag circuit
switching occurs (if configured) to equalize run times per
compressor for improved compressor reliability. The compressor to start first is changed every time stage equals zero.
NOTE: Automatic lead/lag should be disabled if optional hot
gas bypass is employed because the unit only contains hot
gas bypass on one circuit.
The VAV control system sequence uses the modified supplyair set point (MSAT = supply-air set point 1 reset value) as
the supply-air temperature required to satisfy conditions (submaster reference value [CSSR]) and outputs this value to the
submaster loop.
The submaster loop uses the modified supply-air set point
compared to the actual supply-air temperature to determine
the required number of capacity stages to satisfy the load.
The logic for determining when to add or subtract a stage is
a time-based integration of the deviation from the set point
plus the rate of change of the supply-air temperature.
The CV control system sequence reads the space sensor
and performs a calculation to determine the supply-air temperature required (a cooling coil submaster reference [CCSR]
value) to satisfy conditions and outputs this value to the submaster loop.
OCCUPIED COOLING
General — Economizer cycle must not be usable or outside
air damper position must be open to 90% or higher.
VAV Units — Supply fan must be ON for cooling control to
operate. Sequence is as follows:
1. Unit must not be in heating mode.
53
ADAPTIVE OPTIMAL STOP (CV Applications Only) —
Optimal stop is used to allow space temperature to drift to
an expanded occupied set point during the last portion of an
occupied period. The control calculates a stop time offset,
(the time in minutes prior to the scheduled unoccupied time)
during which expanded heating and cooling set points can
be used. Adaptive optimal stop utilizes space temperature,
an expanded occupied set point, and a ‘‘K’’ factor to calculate stop time offset. The amount (F) to expand the occupied
set point is user configurable. Like adaptive optimal start,
the control corrects itself for optimal operation by adjusting
the ‘‘K’’ factor as required.
HEATING
NOTE: The heating algorithms on the units will only run
when the supply-air (evaporator) fan is on. Two-stage factoryinstalled gas heat is standard on the 48FP,JP,NP units.
When the unit is in the Heating mode, room terminals must
be fully open. The room terminals should be controlled by
the heat interlock relay (HIR) function on VAV applications.
NOTE: HIR not applicable on units using DAV applications.
During heating, the economizer dampers will be at the minimum damper position during Occupied Heating mode, and
will be fully closed during unoccupied heating.
Occupied VAV Operation — Heating is primarily used for
morning warm-up or occupied space heating with the heater
being staged to maintain desired return-air temperature. If
the unit is in morning warm-up, the return-air temperature is
read and compared to the occupied heating set point. The
unit controls will compare the calculated supply-air temperature set point to the actual supply-air temperature to compute the number of stages required to satisfy the conditions.
Once morning warm-up is completed and the unit is in
Occupied mode, heat will not be activated again unless the
Occupied Heating mode has been selected.
Occupied CV Operation — The heater is staged to prevent
the occupied space temperature from falling below the desired set point. The control reads the space temperature and
computes the supply-air temperature necessary to heat the
space to the heating set point. The unit controls will compare the calculated supply-air temperature set point to the
actual supply-air temperature to compute the number of stages
required to satisfy the conditions.
Morning Warm-Up (VAV Only) — Morning warm-up occurs when the adaptive optimal start (AOS) algorithms start
the unit before the occupied start time, and the unit has a
heating demand. The morning warm-up control uses the occupied heating set point for controlling heat stages. Once the
return air reaches the set point, heating will be shut off.
When the heating demand is satisfied, the warm-up condition will terminate. The unit may reenter morning warm-up
if there is another call for heat before the start of the occupied period. Morning warm-up can continue into the occupied period as long as there is a need for heat, even if occupied heating is not enabled.
NOTE: The economizer dampers will be fully closed during
morning warm-up, except when morning warm-up continues into the occupied period. If morning warm-up continues
into the occupied period, the dampers will open to the minimum position to provide ventilation air.
Room terminals must go to the fully open position when
the unit enters the heating mode. The terminals should be
controlled by the HIR function. When the unit goes into heating mode, the HIR contacts are energized which open the
room terminals.
NOTES:
1. Morning warm-up is initiated before the unit schedule designated occupied time.
2. HIR is not applicable on units using DAV applications.
Economizer Minimum Position — The control has the capability of maintaining the minimum economizer position
based on 3 inputs. The 3 inputs are minimum position,
outdoor-air cfm, and IAQ set points. The
VENT
function is used to configure the control for the minimum position of the economizer.
Indoor-Air Quality (IAQ) — The unit may be configured to
control the occupied space indoor-air quality by maintaining
a constant cfm of outdoor air and/or an allowable level of
undesirable gases or vapors (CO2, CO, formaldehyde, etc.)
with installation of appropriate sensors and/or accessories.
The economizer dampers will modulate to maintain the userdefined set points.
An alert will be generated after 10 minutes if the air quality level has not been reduced below the set point.
The indoor air quality feature has 3 priority levels as follows (Refer to Indoor Air Quality (IAQ) and Outdoor Air
Control (OAC) sections on pages 25 and 26 for more
details):
Priority Level 1 — This is the highest level of priority for
indoor air quality. When the IAQ set point is exceeded, the
IAQ algorithms adjust the economizer damper position to
purge the controlled space of CO2 or other contaminants.
Priority Level 2 — This is a medium level priority and provides for some occupied space comfort overrides. The IAQ
algorithms adjust the economizer damper position to purge
the controlled space of CO2 or other contaminants. However, the following comfort overrides may take precedence:
• space temperature
• supply-air temperature (VAV)
• space humidity
Priority Level 3 — This is the lowest priority level. When
the IAQ set point is exceeded, an alert is generated. Alert
can be viewed at the HSIO and is broadcast on the CCN
network (if applicable), but no other action is taken.
NOTE: Consult the latest updated issue of ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning
Engineers) Standard 62 when determining required set points
for indoor air quality (ASHRAE 62, Ventilation for Acceptable Indoor-Air Quality section).
Head Pressure Control — The microprocessor controls the condenser fans to maintain the lowest condensing
temperature and the highest operating efficiency possible. The
condenser fan stages are configured to react to either saturated condensing temperatures (SCT) or refrigerant pressure
sensors, or can be controlled by the lead compressor.
Unit sizes 034-038 have 2 stages of fan control. The stage
2 fan contactor OFC1 will cycle in response to the higher
SCT of the 2 circuits. Unit sizes 044-074 have 3 fan stages.
Fan contactors OFC1 and OFC2 will respond to their associated circuit SCT.
A low ambient head pressure control option is also included standard on all units as an additional feature to allow
fan cycling on the first stage. The first stage of head pressure
control is cycled in the same manner as the Motormastert II
control. See Table 48.
The highest SCT is used to control the condenser (outdoor) fan motor(s) (OFM) controlled by the head pressure
control relay (MMR). See Table 49 for fan control points. If
either stage 2 contactor (OFC1 or OFC2) is energized in addition to MMR, then MMR will be locked in the energized
mode.
The 2 other stages of head pressure control are controlled
by the SCT on standard units, or the SCT and suction transducers on units equipped with suction pressure transducers
and suction sensors. Table 49 shows the fan configurations
and lists the on and off points for OFC1 and OFC2.
Table 49 also describes the fan sequence of operation and
defines the particular fans controlled by stage.
54
Table 48 — Head Pressure/Fan Cycling Control
CONTROL LOGIC
UNIT CONFIGURATION
STANDARD (with standard SCT sensors)
(MMAS = Yes)
(TRNS = No)
With Accessory Sensors
(Pressure Transducers)
(MMAS = Yes)
(TRNS = Yes)
STAGE
OFM OFF
SCT < (HPSP − 37 F) for 90 secs
AND Stage 2 motors OFF
SCT > (HPSP − 15 F)
2
SCT > HPSP
(start delayed 60 secs after start
of compressor, unless
SCT > 143 F)
SCT < (HPSP − 35 F) for 120 secs
1
SCT > 138 F
SCT < (HPSP − 37 F) for 90 secs
AND Stage 2 motors OFF
2
MotormasterT Control Disabled
(MMAS = No)
OFM ON
1
1
2
SCT > HPSP
(start delayed 60 secs after start
of compressor, unless
SCT > 143 F)
On with compressor
SCT > HPSP
SCT < (HPSP − 35 F) for 120 secs
Off with compressor
SCT < (HPSP − 35 F) for 120 secs
CONTROL OUTPUTS
UNIT SIZES
034-038
044,048
054-074
DSIO
HPSP
MM
MMC
OFC
PSIO
SCT
—
—
—
—
—
—
—
FAN STAGE/CIRCUIT NO.
Stage 1/Common
Stage 2/Common
Stage 1/Common
Stage 2/Circuit 1
Stage 2/Circuit 2
Stage 1/Common
Stage 2/Circuit 1
Stage 2/Circuit 2
DEVICE/CHANNEL
PSIO-1/13
DSIO-1/29
PSIO-1/13
DSIO-2/29
DSIO-2/30
PSIO-1/13
DSIO-2/29
DSIO-2/30
LEGEND
Relay Module
Head Pressure Set Point
MotormasterT Device
Motormaster Contactor
Outdoor-Fan Contactor
Processor Module
Saturated Condensing Temperature
55
RELAY
MM
—
MM
—
—
MM
—
—
CONTACTOR
MMC
OFC1
MMC
OFC1
OFC2
MMC1, MMC2
OFC1
OFC2
Table 49 — Fan Sequence of Operation
UNIT SIZES
FAN ARRANGEMENT
STAGE
CIRCUIT
FAN RELAY
OUTPUT
RELAY
CONTROLLED
FAN(S)
CONTROLLED
1
Com
MM
MMC
OFM1
2
Com
OFC1
—
OFM2
1
Com
MM
MMC
OFM2
1
OFC1
—
OFM1
2
OFC2
—
OFM3
Com
MM
MMC1
MMC2
OFM3
OFM4
1
OFC1
—
OFM1
2
OFC2
—
OFM2
Com
MM
MMC1
MMC2
OFM3
OFM5
1
OFC1
—
OFM1
2
OFC2
—
OFM2, OFM4
034-038
044,048
2
1
054,064
2
1
074
2
LEGEND
MM — Head Pressure Control Function
MMC — Head Pressure Control Function Contactor
OFC — Outdoor (Condenser) Fan Contactor
OFM — Outdoor (Condenser) Fan Motor
SCT — Saturated Condensing Temperature
NOTE: ‘‘Com’’ indicates that control of this stage is ‘‘common’’ to both circuits. To start this stage,
EITHER circuit’s SCT must satisfy the ON criteria; to stop this stage, BOTH circuits’ SCT must satisfy
the OFF criteria.
56
generated. If the alert condition still exists 30 minutes after
unit enters Occupied mode, an alert will be generated at that
time.
UNIT OPERATION
Unit Operation information can be accessed through the
HSIO keypad and display (field-installed accessory). See the
Keypad and Display Module section on page 9 for information on using the HSIO. The Status Function is provided
to allow the user to access unit operation information.
(Modes)— There are 21 different operating modes
available. The operating mode codes are displayed to indicate the operating status of the unit at a given time. To enter
the modes subfunction, press
and use the
to determine if more than 1 mode is in effect. See Table 45 for a
list of the modes and mode names.
Refer to the Controls and Functions section on pages 8-33
for a detailed explanation of each mode.
Status Function — This function shows the current status of the alarm and alert codes, operating modes, capacity
stages, operating set point, all measured system temperatures and pressures, superheat and saturated condensing temperature values, pressure switch positions, analog inputs, switch
inputs, system component status, and unit standby/run (disable/
enable) capability. See Table 50.
(Alarms) — Alarms are signals sent by the processor that one or more faults have been detected. Each
fault is assigned a code number which is reported as an
alarm code. Refer to Alarms and Alerts section on page 67
for specific alarm information. These codes indicate a failure that causes the unit to shut down, terminate an option, or
results in the use of a default value as a set point.
To view all current alarms, press
to enter the alarm
displays and then press
to move to the individual alarm
(Stages) — This subfunction displays the information about the current stage. A capacity stage number, from
0 to 6 for cooling and 0 to 2 for heating is displayed to indicate the number of active stages. See Tables 51 and 52 for
compressor loading sequences. To access the cooling stages
function, press
and press
to display the number
of cooling stages in operation (COOL). Press
to display the following:
1. Cooling Percent Capacity (CPC) — Percent of total unit
cooling capacity being utilized.
2. Heating Stages (HEAT) — The number of active heating
stages.
3. Heating Percent Capacity (HPC) — Percent of total unit
heating capacity being utilized.
4. Sum/Z Ratio (SMZ) — Load/unload factor is used to determine when compressors and unloaders will be staged.
This factor indicates when the addition or subtraction of
a step of capacity will occur.
displays. Press
after a code has been displayed to expand
the code into a full definition.
When a diagnostic code is stored in the display and the
unit automatically resets, the code is entered into the alarm
history. Codes for safeties, which do not automatically reset,
are not deleted until the problem is corrected and the machine is switched to standby, and then back to run mode.
(Alerts) — There are over 20 input channels of alerts
which are compared against their configured alert limits. If
any channel is detected outside of these limits, the corresponding alert number will be displayed after pressing
to determine if any alerts are present. The
will display
first alert. Press
after a code has been displayed to expand the code into a full definition.
(Set Point) — This subfunction displays the operating set points that are currently in effect, either occupied
or unoccupied. To access the control set point function, press
and press
to display the current control set point.
NOTE: If unit is programmed for CV operation, this will be
the cooling submaster reference value for cooling and the
heating set point for heating. For units programmed for VAV
operation, this will be the MSAS (supply-air set point 1 reset) for cooling and the heating set point for heating.
Press
on the keypad to determine a configured alert limit. Then access the
subfunction per
Table 14 to determine the actual value being monitored.
Table 14 also indicates the acceptable high and low limits
(both Occupied and Unoccupied modes) for the configured
alerts and defines the factory preset default values. The alert
will return to normal once the alert channel meets the criteria. The criteria for return to normal is the high limit minus
a constant or the low limit plus a constant. See Table 15 for
the list of constants. Items having no constant return to normal as soon as the unit returns to the acceptable range (between low and high limits).
Certain analog alerts are only generated when the unit is
in the occupied mode. These alerts are IAQ (Indoor Air Quality), OAC (Outdoor Air Quality), and BP (building pressure). Alerts will not be generated when the controls are in
the Unoccupied mode, even if the sensor value is outside the
configured limits.
The OAT (outdoor-air temperature) and OARH (outdoorair relative humidity) analog alerts are monitored at all times
and generate alerts whenever the sensor value exceeds the
corresponding alert limits.
The SAT (supply-air temperature), SPT (space temperature), RAT (return-air temperature), SP, and RH have alert
limits for both the Occupied and Unoccupied modes (see
Table 14). A 30-minute delay is used when changing from
Unoccupied to Occupied mode for these alerts. If an alert
condition exists in the Unoccupied mode, no alert will be
Press
to display the control temperature. This display is the actual supply-air temperature leaving the unit.
(Temperature) — The system temperature subfunction displays the readings at the temperature sensing thermistors. To read a temperature, press
, then scroll to
the desired temperature reading by pressing
.
(Pressure) — The system pressure subfunction displays suction, discharge, low-pressure switch status, building pressure, and static pressure.
(Inputs) — This subfunction displays the rest of the
system inputs. Press
, then press
. The compressor A1 status is displayed with either ON or OFF based on
whether the compressor is running or not. Press
to
access additional system inputs. Some inputs can be used
forced by entering a value to replace the actual value. For
example, press
until the ENT display appears. The display will show ENT LOW or ENT HGH, indicating that the
enthalpy is good (LOW) or bad (HGH).
57
Table 50 — Status Directory
STATUS
Subfunction
1
ALARMS
Keypad Entry
Display
ALARMS
Expansion (Press
key)
CURRENT ALARMS
ALARM 51
COMPRESSOR A1 FAULT
ALARM 53
COMPRESSOR A1 STATUS
ALARM 55
COMPRESSOR B1 FAULT
ALARM 57
COMPRESSOR B1 STATUS
ALARM 59
THERMISTOR FAILURE SUPPLY AIR
ALARM 60
THERMISTOR FAILURE RETURN AIR
ALARM 61
OUTSIDE AIR THERMISTOR FAILURE
ALARM 62
CIRCUIT A CONDENSER THERMISTOR FAILURE
ALARM 63
CIRCUIT B CONDENSER THERMISTOR FAILURE
ALARM 64
COMPRESSOR A1 THERMISTOR FAILURE
ALARM 65
COMPRESSOR B1 THERMISTOR FAILURE
ALARM 66
SPACE THERMISTOR FAILURE
ALARM 67
CIRCUIT A DISCHARGE TRANSDUCER FAILURE
ALARM 68
CIRCUIT B DISCHARGE TRANSDUCER FAILURE
ALARM 69
CIRCUIT A SUCTION TRANSDUCER FAILURE
ALARM 70
CIRCUIT B SUCTION TRANSDUCER FAILURE
ALARM 71
LOSS OF COMMUNICATION WITH DSIO1
ALARM 72
LOSS OF COMMUNICATION WITH DSIO2
ALARM 73
LOSS OF COMMUNICATION WITH OPTION
BOARD 1 (PSIO2)
ALARM 74
LOW PRESSURE CIRCUIT A
ALARM 75
LOW PRESSURE CIRCUIT B
ALARM 76
HIGH PRESSURE CIRCUIT A
ALARM 77
HIGH PRESSURE CIRCUIT B
ALARM 78
SUPPLY FAN FAILURE
ALARM 80
LOW CIRCUIT A SATURATED SUCTION TEMP
ALARM 81
LOW CIRCUIT B SATURATED SUCTION TEMP
ALARM 82
HIGH CIRCUIT A SUCTION SUPERHEAT
ALARM 83
HIGH CIRCUIT B SUCTION SUPERHEAT
ALARM 84
LOW CIRCUIT A SUCTION SUPERHEAT
ALARM 85
LOW CIRCUIT B SUCTION SUPERHEAT
ALARM 86
ILLEGAL CONFIGURATION
ALARM 88
HYDRONIC COIL FREEZE STAT
ALARM 89
PRESSURIZATION
ALARM 90
EVACUATION
ALARM 91
SMOKE PURGE
ALARM 92
FIRE SHUTDOWN
ALARM 93
LINKAGE FAILURE
ALARM 94
BUILDING PRESSURE
ALARM 95
DUCT STATIC PRESSURE
ALARM 97
IAQ SET POINT MISCONFIGURED
See legend and notes on page 60.
58
Table 50 — Status Directory (cont)
STATUS (cont)
Subfunction
2 ALERTS
3 MODES
Keypad Entry
Display
ALERTS
Expansion (Press
key)
CURRENT ALERTS
ALERT 150
SUPPLY AIR TEMP LOW LIMIT
ALERT 151
SUPPLY AIR TEMP HIGH LIMIT
ALERT 152
RETURN AIR TEMP LOW LIMIT
ALERT 153
RETURN AIR TEMP HIGH LIMIT
ALERT 154
OUTSIDE AIR TEMP LOW LIMIT
ALERT 155
OUTSIDE AIR TEMP HIGH LIMIT
ALERT 156
SPACE TEMP LOW LIMIT
ALERT 157
SPACE TEMP HIGH LIMIT
ALERT 158
STATIC PRESSURE LOW LIMIT
ALERT 159
STATIC PRESSURE HIGH LIMIT
ALERT 160
RELATIVE HUMIDITY LOW LIMIT
ALERT 161
RELATIVE HUMIDITY HIGH LIMIT
ALERT 162
OUTSIDE AIR RELATIVE HUMIDITY LOW LIMIT
ALERT 163
OUTSIDE AIR RELATIVE HUMIDITY HIGH LIMIT
ALERT 164
FILTER STATUS
ALERT 165
BUILDING PRESSURE LOW LIMIT
ALERT 166
BUILDING PRESSURE HIGH LIMIT
ALERT 167
OUTSIDE AIR CFM LOW LIMIT
ALERT 168
OUTSIDE AIR CFM HIGH LIMIT
ALERT 169
INDOOR AIR QUALITY LOW LIMIT
ALERT 170
INDOOR AIR QUALITY HIGH LIMIT
ALERT 173
RUN HOURS EXCEED SERVICE/MAINT LIMIT
MODES
CURRENT OPERATING MODES
MODE 21
MODE IS SPACE TEMP RESET
MODE 22
MODE IS DEMAND LIMIT
MODE 23
MODE IS UNOCCUPIED HEAT
MODE 24
MODE IS UNOCCUPIED COOL
MODE 25
MODE IS STANDBY
MODE 26
MODE IS OPTIMAL START
MODE 27
MODE IS UNOCCUPIED
MODE 28
MODE IS IAQ PURGE
MODE 29
MODE IS OPTIMAL STOP
MODE 30
MODE IS OCCUPIED HEAT
MODE 31
MODE IS OCCUPIED COOL
MODE 32
MODE IS OCCUPIED
MODE 33
MODE IS NIGHT TIME FREE COOL
MODE 34
MODE IS PRESSURIZATION
MODE 35
MODE IS EVACUATION
MODE 36
MODE IS SMOKE PURGE
MODE 37
MODE IS FIRE SHUTDOWN
MODE 38
MODE IS TIMED OVERRIDE
MODE 39
MODE IS DAV CONTROL
MODE 40
MODE IS FACTORY-FIELD TEST
MODE 41
MODE IS HIGH HUMIDITY OVERRIDE
59
Table 50 — Status Directory (cont)
STATUS (cont)
Subfunction
Keypad Entry
4 STAGES
Display
STAGES
CURRENT STAGES
COOL X
COOLING STAGES X
CPC X
COOLING PERCENT CAPACITY X
HEAT X
HEATING STAGES X
HPC X
HEATING PERCENT CAPACITY X
SMZ X
SUM/Z RATIO X
SETPOINT
5 SET POINT
6
TEMPERATURE
CONTROL SETPOINT X
CLTP X
CONTROL TEMP X
TEMPS
SYSTEM TEMPERATURES
STA X
CIRCUIT A SATURATED SUCTION TEMP X
SHA X
CIRCUIT A SUCTION SUPERHEAT
STB X
SSTB X
7
PRESSURE
*
CIRCUIT A SATURATED CONDENSING TEMP X
CIRCUIT A SUCTION TEMP X
SSTA X
SCTB X
ENTER
CIRCUIT B SATURATED CONDENSING TEMP X
CIRCUIT B SUCTION TEMP X
CIRCUIT B SATURATED SUCTION TEMP X
SHB X
CIRCUIT B SUCTION SUPERHEAT
SAT X
SUPPLY AIR TEMP X
RAT X
RETURN AIR TEMP X
SPT X
SPACE TEMP X
OAT X
OUTSIDE AIR TEMP X
OAT X
OUTSIDE AIR TEMP X (240 F to 245 F)
PRESSURE
SYSTEM PRESSURES
DPA X
CIRCUIT A DISCHARGE PRESSURE SENSOR X
SPA X
CIRCUIT A SUCTION PRESSURE SENSOR X
LPA X
CIRCUIT A LOW PRESSURE SWITCH X
DPB X
CIRCUIT B DISCHARGE PRESSURE SENSOR X
SPB X
CIRCUIT B SUCTION PRESSURE SENSOR X
LPB X
CIRCUIT B LOW PRESSURE SWITCH X
BP X
BUILDING PRESSURE X
SP X
STATIC PRESSURE X
LEGEND
DAV
— Digital Air Volume
IAQ
— Indoor-Air Quality
TEMP — Temperature
*An ‘‘X
ENTER
key)
CURRENT OPERATING SETPOINT
CLSP X
SCTA X
X
Expansion (Press
’’ in the Keypad Entry column indicates that the reading can be forced by entering a value
and then pressing ENTER . The valid force ranges are listed in the Expansion column.
NOTES:
1. Alarm no. will only be displayed if ALARM is present.
2. Alert no. will only be displayed if ALERT is present.
3. If unit is not configured for a certain subfunction, that subfunction will not show up when scrolling through values.
60
Table 50 — Status Directory (cont)
STATUS (cont)
Subfunction
Keypad Entry
8 INPUTS
X
X
ENTER
ENTER
*
*
Display
INPUTS
SYSTEM INPUTS
CSA1 X
COMPRESSOR A1 STATUS X
CSB1 X
COMPRESSOR B1 STATUS X
CFA1 X
COMPRESSOR A1 SAFETY X
CFB1 X
COMPRESSOR B1 SAFETY X
OAC X
OUTSIDE AIR CFM X
IAQ X
INDOOR AIR QUALITY X
X
ENTER
ENTER
*
*
9 ANALOG
SFS X
SUPPLY FAN STATUS X
ENTHALPY SWITCH X
ENT X
ENTHALPY SWITCH X (0 = High, 1 = Low)
RH X
RELATIVE HUMIDTIY X
RH X
RELATIVE HUMIDITY X (0 to 100%)
FRZ X
FREEZE STAT X
OUTSIDE AIR RELATIVE HUMIDITY X (0 to 100%)
FLTS X
FILTER STATUS X
FLTS X
FILTER STATUS X (0 = Clean, 1 = Dirty)
STO X
SPACE TEMP OFFSET X
EVAC X
EVACUATION X
PRES X
PRESSURIZATION X
PURG X
SMOKE PURGE X
FSD X
FIRE SHUTDOWN X
ANALOG
ANALOG OUTPUTS
ECON X
HCV X
X
ENTER
ENTER
*
*
OUTSIDE AIR RELATIVE HUMIDITY X
OARH X
IGV X
X
key)
ENT X
OARH X
X
Expansion (Press
HCV X
INLET GUIDE VANES X
ECONOMIZER X
HEATING COIL VALVE X
HEATING COIL VALVE X (0 to 100%)
PERD X
POWER EXHAUST/RETURN DAMPER X
HUM X
HUMIDIFIER 4-20 X
HUM X
HUMIDIFIER 4-20 X (0 to 100%)
61
Table 50 — Status Directory (cont)
STATUS (cont)
Subfunction
Keypad Entry
10
OUTPUTS
Display
Expansion (Press
OUTPUTS
X
X
ENTER
ENTER
*
*
DISCRETE OUTPUTS
SF X
SUPPLY FAN X
SF X
SUPPLY FAN X (0 = On, 1 = Off)
EC2P X
ECONOMIZER 2 POSITION X
EC2P X
ECONOMIZER 2 POSITION X (0 = Open, 1 = Closed)
MM X
MOTOR MASTER/FAN STAGE 1 X
FR2 X
OUTDOOR FAN 2 X
FR3 X
X
X
11
STANDBY
ENTER
ENTER
*
*
OUTDOOR FAN 3 X
SF2S X
2 SPEED SUPPLY FAN X
EFRF X
EXHAUST/RETURN FAN X
CPA1 X
COMPRESSOR A1 X
CPB1 X
COMPRESSOR B1 X
ULA1 X
UNLOADER A1 X
ULB1 X
UNLOADER B1 X
ULA2 X
UNLOADER A2 X
ULB2 X
UNLOADER B2 X
HS1 X
HEAT STAGE 1 X
HS2 X
HEAT STAGE 2 X
HS3 X
HEAT STAGE 3 X
HS4 X
HEAT STAGE 4 X
HS5 X
HEAT STAGE 5 X
HIR X
HEAT INTERLOCK RELAY
HUM1 X
HUMIDIFIER 1ST STAGE X
HUM1 X
HUMIDIFIER 1ST STAGE X (0 = On, 1= Off)
DTCC X
DISCRETE TIME CLOCK CONTROL X
DTCC X
DISCRETE TIME CLOCK CONTROL X (0 = On, 1 = Off)
PERD X
POWER EXHAUST/RETURN DAMPER X
STANDBY
STANDBY/RUN MODE (0 = Run, 1 = Standby)
STBY X
UNIT IN STANDBY X
EXT X
EXTERNAL CLOCK INPUT (Remote on/off) X (0 = On, 1 = Off)
LEGEND
DAV
— Digital Air Volume
IAQ
— Indoor-Air Quality
TEMP — Temperature
*An ‘‘X
ENTER
key)
’’ in the Keypad Entry column indicates that the reading can be forced by entering a value
and then pressing ENTER . The valid force ranges are listed in the Expansion column.
NOTES:
1. Alarm no. will only be displayed if ALARM is present.
2. Alert no. will only be displayed if ALERT is present.
3. If unit is not configured for a certain subfunction, that subfunction will not show up when scrolling through values.
62
(Outputs) — This subfunction displays the various system discrete outputs. These displays indicate the ability of the component or device to operate. It does not indicate that the component or device is functioning, but that the
component or device has been energized by the control. Press
to access additional discrete outputs. Some outputs can
be user forced.
If the display is ENT HGH and the user wants to
ENTER will change the display to
use outdoor air, pressing
ENT LOW/FORCE 4; overriding or ‘‘forcing’’ the enthalpy
status to be good. This allows economizer operation.
Refer to Table 50 for more information on ‘‘forcible’’
displays. To discontinue a forced command, press the
key. This removes the forced value and allows the unit to
accept input from the controlling device.
CLEAR
(Standby) — The Standby/Run mode indicates
the current capability of the unit. Press
to access Standby.
This displays either a STBY NO (unit is in the run configuration) or STBY YES (unit is in standby and is not capable
of operating). To change from STBY YES to STBY NO,
ENTER . To change from STBY NO to
either press
or
ENTER
STBY YES, press
. This change to STBY YES will
clear any alarms present on the unit.
Press
to view external clock input status. This status
status indicates when the remote on-off control of unit is in
effect. A 0 is displayed when there is no external input. A 1
is displayed when an external clock input is present.
The forced values are useful for problem diagnosis, and
as a preliminary step before running the test function.
(Analog outputs) — This subfunction displays the
status of the various analog outputs. Press
to access additional analog outputs. Some outputs can be user forced by
entering a value for the output. For example, press
until
the HCV display appears. The display will indicate an output value describing the heating coil valve percent open.
If the display reads HEATING COIL VALVE 0 (valve
closed) and the user wants to use the heating coil, pressing
ENTER will change the display to HEATING COIL
VALVE 100/FORCE 4; overriding or forcing the heating coil
valve to 100% open. This is useful for problem diagnosis
and as a preliminary step before running the test function.
CLEAR
Table 51 — Compressor Loading and Unloading Sequences (60 Hz Units)
COOLING
STAGE
0
1
2
3
4
5
6
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
OFF
Comp 1
OFF
ON
ON
ON
ON
ON
ON
COOLING
STAGE
0
1
2
3
4
5
Comp 1
OFF
ON
ON
ON
ON
ON
COOLING
STAGE
0
1
2
3
4
Comp
OFF
ON
ON
ON
ON
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
Lead Circuit
Unloader
1
U1
OFF
ON
OFF
OFF
OFF
SIZE 034 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
Unloader
U2A
OFF
OFF
OFF
OFF
ON
OFF
OFF
SIZE 038 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
SIZE 044 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
63
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
12
0
17
33
50
67
83
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
0
14
28
42
71
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
0
25
50
75
100
Table 51 — Compressor Loading and Unloading Sequences (60 Hz Units) (cont)
COOLING
STAGE
0
1
2
3
4
5
COOLING
STAGE
0
1
2
3
4
5
COOLING
STAGE
0
1
2
3
4
5
6
COOLING
STAGE
0
1
2
3
4
5
6
Comp 1
OFF
ON
ON
ON
ON
ON
Comp 1
OFF
ON
ON
ON
ON
ON
Comp 1
OFF
ON
ON
ON
ON
ON
ON
Comp 1
OFF
ON
ON
ON
ON
ON
ON
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
SIZE 048 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
SIZE 054 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
OFF
SIZE 064 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
Unloader
U2A
OFF
OFF
OFF
OFF
ON
OFF
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
OFF
SIZE 074 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
Unloader
U2A
OFF
OFF
OFF
OFF
ON
OFF
OFF
64
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
0
19
38
58
79
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
0
20
40
60
80
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
12
0
17
33
50
67
83
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
12
0
14
29
43
62
81
100
Table 52 — Compressor Loading and Unloading Sequences (50 Hz Units)
COOLING
STAGE
0
1
2
3
4
COOLING
STAGE
0
1
2
3
4
5
COOLING
STAGE
0
1
2
3
4
5
6
COOLING
STAGE
0
1
2
3
4
5
6
SIZE 034 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
Lead Circuit
Unloader
Comp 1
U1
OFF
OFF
ON
ON
ON
OFF
ON
OFF
ON
OFF
Comp 1
OFF
ON
ON
ON
ON
ON
Comp 1
OFF
ON
ON
ON
ON
ON
ON
Comp 1
OFF
ON
ON
ON
ON
ON
ON
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
OFF
Lead Circuit
Unloader
U1
OFF
ON
ON
OFF
OFF
OFF
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
Unloader
U2A
OFF
OFF
OFF
OFF
OFF
SIZE 044 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
OFF
SIZE 054 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
Unloader
U2A
OFF
OFF
OFF
OFF
ON
OFF
OFF
Unloader
U2
OFF
ON
OFF
OFF
OFF
OFF
OFF
SIZE 064 UNITS
Lag Circuit
Unloader
Comp 2
U1A
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
Unloader
U2A
OFF
OFF
OFF
OFF
ON
OFF
OFF
65
Active
Cyls
Percent
Capacity
0
2
4
8
10
0
29
58
86
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
0
19
38
58
79
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
12
0
17
38
57
71
86
100
Active
Cyls
Percent
Capacity
0
2
4
6
8
10
12
0
17
33
50
67
83
100
TROUBLESHOOTING
display reads STBY NO, press
to place the unit in
standby mode. If display reads STBY YES, the unit is already in the standby mode. To remove the unit from Standby
ENTER
mode, press
.
By using the accessory keypad and display module and
the status function, actual operating conditions of the unit
are displayed while it is running. Test function allows proper
operation of compressors, compressor unloaders, fans, and
other components to be checked while unit is stopped. Service function displays how configurable items are configured.
If an operating fault is detected, an alarm is generated and
an alarm code(s) is displayed under the subfunction
,
along with an explanation of the fault. All current alarm codes
are stored under this subfunction. For checking specific items,
see Table 53.
Any compressors and condenser fans which are operating
will take several seconds to shut down once the unit is placed
in Standby mode. The evaporator fan will take approximately 15 seconds to shut down.
NOTE: When unit is in Standby mode (display reads STBY
YES), no commands will be accepted from the CCN communications bus.
Checking Display Codes — To determine how the
unit has been programmed to operate, check diagnostic
information (
and
) and operating mode displays (
). If no display appears, follow procedures in
Control Modules section on page 76. If display is working,
continue as follows:
1. Note all alarm and alert codes displayed,
and
.
2. Note all operating mode codes displayed,
.
3. Note control temperature set point in effect and current
control temperature,
.
If unit is running, compare the ‘‘in effect’’ control set point
with current temperature. Check the programming of schedule function to see if occupied or unoccupied set point
should be in effect.
Complete Unit Stoppage — If the unit is off, there
are several conditions that can cause this situation to occur:
1. Cooling load satisfied.
2. Programmed schedule.
3. General power failure.
4. Blown fuse in the control power feed.
5. Open control circuit fuse.
6. Unit ON/OFF switch moved to OFF position.
7. Loss of communications between the processor module
and other control modules.
8. Operation of the unit blocked by the demand limit
function.
9. Unit is in Standby mode.
10. Unit is turned off through the CCN network.
11. Unit supply-air temperature (SAT) thermistor failure.
12. Supply-air fan is not operating.
13. High duct static pressure.
14. Remote on-off circuit open (off).
Unit Standby — To place the unit in Standby mode, place
LOCAL/REMOTE selection switch in the LOCAL (OFF)
position and then use the HSIO and press
. Press
until the display reads STBY YES or STBY NO. If
Table 53 — Controls Troubleshooting
SYMPTOM(S)
Evaporator fan does not run.
Compressor does not run.
Condenser fans do not
turn on.
Heating and cooling
occur simultaneously.*
Evaporator fan runs, but
cooling or heating will not operate.
Economizer does not appear to
control to the discharge
air set point.
Cooling demand exists and
economizer modulates, but
compression is not operating.
Controls do not seem
to be operating.
PROBABLE CAUSE(S)
1. Circuit breaker open.
2. Fan configured for automatic operation.
SOLUTION(S)
1. Find cause and reset circuit breaker.
2. Reconfigure Evaporator Fan from Automatic to
Constant using
on HSIO.
3. Inverter overload.
1. Fan interlock does not sense
evaporator fan is operating.
2. Circuit breaker is open.
3. There is no demand for cooling.
4. The control is locking out cooling operation.
3. Find cause and reset.
1. Check fan status switch and pressure tubing.
1. Unit is equipped with transducers and
service valves are back seated.
2. Circuit breaker is open.
Occupied heating is configured as on and
occupied heat set point is set higher
than the cooling set point.
Fan interlock does not sense that
evaporator fan is operating.
Economizer is probably working
correctly.
Compression cannot be initiated
until economizer damper is 90% open.
Remote on-off function may be
keeping controls off.
2. Find cause and reset circuit breaker.
3. Correct operation.
4. Check rotating display for alarm codes. Resolve
alarm cause and reset control by changing to
Standby and back to Run mode.
1. Turn service valve at least one turn from
backseated position.
2. Find cause and reset circuit breaker
Turn off occupied heating, or lower heating set point.
Check fan status switch and pressure tubing.
Economizer controls to a modified set point to
maximize free cooling. See Economizer
section on page 20.
Correct operation.
Terminals 1 and 2 on Channel 49 must be
shorted by remote switch or jumper.
*Simultaneous operation of cooling and heating may occur on VAV units as the Occupied Heating function begins. Check the unit operating mode.
Simultaneous operation of cooling and heating is permitted during Dehumidification/Reheat. Check
unit operating mode.
66
NOTE: To disable unit operation, press
and
put the unit in Standby mode.
DIAGNOSTIC ALARM CODES AND POSSIBLE CAUSES
(See Table 45):
Alarm Codes 51 and 55 (Compressor Fault) — Alarm code
51 is for a fault on compressor A1, and alarm code 55 is for
a fault on compressor B1. If the DSIO1 relay module fails
or a compressor safety circuit switch opens during the operation of the compressor, the microprocessor detects this
fault, stops the compressor, signals the alarm, and deenergizes the DSIO1 relay to lock the compressor off. To reset
the alarm, use the manual method. The possible causes are:
1. High-pressure switch open (code 51 or 55, then code 76
and/or 77 if pressure transducers are installed). The highpressure switch is wired in series with the 24-v supply
that energizes the load side of the DSIO1 module. If the
high-pressure switch opens during compressor operation,
the compressor stops, and the stop is detected by the DSIO1,
terminal strip J3.
2. Wiring error. A wiring error in the control safety circuit
will cause the modules to malfunction, and an error will
be indicated.
To check out alarm codes 51 or 55:
Single Circuit Stoppage — If a single circuit stops,
there are several potential causes:
1. Open contacts in the compressor high-pressure switch.
2. Low refrigerant pressure.
3. Thermistor failure.
4. Transducer failure.
5. High suction superheat.
6. Low suction superheat.
7. Unit supply-air temperature thermistor (SAT) failure.
8. Compressor circuit breaker trip.
9. Operation of the circuit blocked by the demand limit
function.
10. Loss of communications between the processor module
and DSIO1 module.
Restart Procedure — Before attempting to restart the
machine, check the alarms and alerts subfunctions to determine the cause of the shutdown. If the unit, circuit, or compressor stops more than once as a result of a safety device,
determine and correct the cause before attempting to start
the unit again.
After the cause of the shutdown has been corrected, unit
restart may be automatic or manual depending upon the fault.
A manual reset requires the standby mode be reenabled to
STBY NO display. Manual reset conditions may also be cleared
through the Building Supervisor or Service Tool by selecting Modify, Controller, Configuration and downloading ‘‘Unit
Reset YES’’ from the configuration screen. All of the fault
conditions are described in the Diagnostic Alarm Codes And
Possible Causes section on this page.
1. Scroll through the subfunction
to the proper
compressor number using the
key.
ENTER
2. Energize the step (press
). If the compressor does
not start, the cause is most likely related to one of the
following: HPS (high-pressure switch) open, tripped compressor circuit breaker or incorrect wiring in either the
safety circuit or compresesor contactor coil circuit. To
follow the circuit alarm, see the unit wiring diagram.
Alarms and Alerts — Alarms and alerts are warnings
of abnormal or fault conditions, and may cause either one
circuit or the whole unit to shut down. They are assigned
code numbers as described below. The alarm descriptions
are displayed on the HSIO when the
subfunction is
entered. When a communication loss occurs to a hardware
point, an alert or alarm may be generated. Refer to Table 14.
The PSIO also recognizes illegal configurations.
Table 54 contains a detailed description of each alarm and
alert code error and possible cause. Manual reset is accomENTER
plished by entering
from the HSIO and pressing
or moving the ON/OFF Switch to the OFF position, then
back to ON (if Alarm Reset Select is enabled). See Table 54
for listing of each alarm and alert code.
If the compressor starts, verify that all stages of condenser fans are operational using
and ENTER for MM,
FR2, and FR3.
Return unit to run mode and observe compressor operation to verify that compressor lock-out circuit is working and
condenser fans are energized after compressor starts.
NOTE: With head pressure control option enabled (
,
MMAS = YES), a short delay will occur before the first stage
of condenser fan(s) is energized. Check location of SCT on
condenser coil or pressure transducer wiring and pressure
(if equipped) if condenser fans do not start.
Alarm Codes 53 and 57 (Compressor Status) — If the commanded state of the compressor does not match compressor
status for 3 seconds, the corresponding compressor stops and
the proper alarm trips. This alarm will detect circuit breaker
failures, and failure of the compressor contactor to be energized. If a compressor circuit breaker trips due to compressor overcurrent or a short or ground between the circuit
breaker and compressor, an alarm for that compressor will
be indicated. This will only affect that circuit; the other circuit will continue to operate. The microprocessor is also programmed to indicate a compressor failure if the CLO (cooling lockout) circuit to the DSIO1, terminal J3, receives
a voltage when a compressor is not supposed to be operating. Other possible causes include a failed contactor or DSIO
module.
Alarm Code 59 (Supply-Air Thermistor Failure) — If the
temperature measured by this thermistor is outside the range
of 240 to 245 F (240 to 118 C), heating, cooling, and economizer use are disabled. Reset of this alarm is automatic once
the problem is corrected. Start-up follows the normal sequence. The cause of the alarm is usually a bad thermistor,
a shorted or open thermistor caused by a wiring error, or a
loose connection.
To determine how a unit is operating, check the diagnostic information available (
through
) and the
operating mode displays (
). If no display appears,
see Control Modules section on page 76. If the display is
working:
1. Note all alarm codes displayed under
.
2. Note all operating mode codes displayed under
.
3. Note the modified supply-air set point in effect and the
current supply-air temperature under
and
.
a. If reset is in effect, the modified set point may be different from the supply-air set point because the space
temperature is below the reset set point.
b. If demand limit is in effect, the unit may be incapable
of producing the desired supply-air set point due to
the decreased capacity of the unit.
c. Check the programming of the schedule function to
see if occupied or unoccupied set point should be in
effect.
67
Table 54 — Alarm Codes
DISPLAY
DESCRIPTION
ACTION TAKEN BY
CONTROL
RESET
METHOD
Compressor A1 shut down
Manual
—
—
Compressor A1 shut down
Manual
—
—
Compressor B1 shut down
Manual
—
—
Automatic
High-pressure switch open.
Wiring error.
—
Voltage on DSIO1 J3 when compressor off.
Failed contactor.
Failed DSIO module.
Circuit breaker tripped.
—
High-pressure switch open.
Wiring error.
—
Voltage on DSIO1 J3 when compressor off.
Failed contactor.
Failed DSIO module.
Circuit breaker tripped.
—
Bad, shorted, or open thermistor caused by a
wiring error or loose connection.
Bad, shorted, or open thermistor caused by a
wiring error or loose connection.
Automatic
Bad thermistor, wiring error, or loose connection.
51
Compressor A1 Failure
52
Not Used
53
Compressor A1 Status Failure
54
Not used
55
Compressor B1 Failure
56
Not Used
57
Compressor B1 Status Failure
Compressor B1 shut down
Manual
58
Not Used
—
59
Supply-Air Thermistor Failure
60
Return-Air Thermistor Failure
61
Outdoor-Air Thermistor Failure
—
Heating, cooling, and
economizer disabled
Heating and economizer
disabled
NTFC disabled and economizer uses enthalpy input
only. If unit has humidity sensors, economizer dampers
close.
62
Saturated Condensing Thermistor Failure, Circuit A
Circuit A shut down
Automatic
63
Saturated Condensing
Thermistor Failure, Circuit B
Circuit B shut down
Automatic
64
Suction Thermistor Failure,
Circuit A
65
Suction Thermistor Failure,
Circuit B
66
Space Thermistor Failure
67
73
Compressor A1 Discharge Pressure Transducer Failure
Compressor B1 Discharge Pressure Transducer Failure
Compressor A1 Suction Pressure Transducer Failure
Compressor B1 Suction Pressure Transducer Failure
Loss of Communications with
DSIO1
Loss of Communications with
DSIO2
Loss of Communications with
PSIO2
74
Superheat alarms disabled.
Unit will operate as if there
are no suction sensors.
Superheat alarms disabled.
Unit will operate as if there
are no suction sensors.
Temperature reset, NTFC,
cooling and heating functions disabled (CV applications only).
PROBABLE CAUSE
Automatic
Automatic
Automatic
Bad thermistor, wiring error, or loose connection.
This alarm is only valid when unit does not have
pressure transducers.
Bad thermistor, wiring error, or loose connection.
This alarm is only valid when unit does not have
pressure transducers.
Bad thermistor, wiring error, or loose connection.
This alarm is only valid when unit is configured for
suction sensors.
Bad thermistor, wiring error, or loose connection.
This alarm is only valid when unit is configured for
suction sensors.
Automatic
Bad thermistor, wiring error, or loose connection.
Compressor A1 shuts down
Automatic
Compressor B1 shuts down
Automatic
Compressor A1 shuts down
Automatic
Compressor B1 shuts down
Automatic
All DSIO1 outputs turned off
Automatic
All DSIO2 outputs turned off
Automatic
All PSIO2 outputs turned off
Automatic
Low Pressure, Circuit A
Circuit A compressor(s) shut
down
Automatic
or Manual
75
Low Pressure, Circuit B
Circuit B compressor(s) shut
down
Automatic
or Manual
76
High Pressure, Circuit A
Circuit A compressor(s) shut
down
Manual
Bad transducer, bad 5-v power supply, or a
wiring error.
Bad transducer, bad 5-v power supply, or a
wiring error.
Bad transducer, bad 5-v power supply, or a
wiring error.
Bad transducer, bad 5-v power supply, or a
wiring error.
Faulty or improperly connected plug, faulty DSIO1
module, or wiring error.
Faulty or improperly connected plug, faulty DSIO2
module, or wiring error.
Faulty or improperly connected plug, faulty PSIO2
module, or wiring error.
Low refrigerant charge, dirty filters, evaporator fan
turning backwards, inlet guide vanes not opening
properly, plugged filter drier, or faulty transducer.
Low refrigerant charge, dirty filters, evaporator fan
turning backwards, inlet guide vanes not opening
properly, plugged filter drier, or faulty transducer.
An overcharged system, high outdoor ambient temperature coupled with a dirty outdoor coil, plugged
filter drier, partially closed liquid line service valve,
or a faulty transducer. This alarm is only valid when
the unit has refrigerant pressure transducers.
68
69
70
71
72
LEGEND
CCN
CV
DSIO
IAQ
NTFC
PSIO
TSM
TXV
—
—
—
—
—
—
—
—
NOTE: Alarms 89-92 are level zero on the CCN Network. All other alarms
are level 2.
Carrier Comfort Network
Constant Volume
High-Voltage Relay Module
Indoor-Air Quality
Nighttime Free Cool
Processor Module
Terminal System Manager
Thermal Expansion Valve
68
Table 54 — Alarm Codes (cont)
DISPLAY
DESCRIPTION
ACTION TAKEN BY
CONTROL
RESET
METHOD
PROBABLE CAUSE
Manual
An overcharged system, high outdoor ambient temperature coupled with a dirty outdoor coil, plugged
filter drier, partially closed liquid line service valve,
or a faulty transducer. This alarm is only valid when
the unit has refrigerant pressure transducers.
Automatic
Fan status switch failure, tubing not properly connected, or fan status switch set incorrectly.
—
—
Low entering outdoor-air temperature, low
evaporator-fan cfm, low refrigerant charge, plugged
filter drier, partially closed liquid line service valve,
or pressure transducer failure.
Low entering outdoor-air temperature, low
evaporator-fan cfm, low refrigerant charge, plugged
filter drier, partially closed liquid line service valve,
or pressure transducer failure.
Low refrigerant charge, plugged filter drier, partially closed liquid line service valve, or a faulty thermistor or transducer.
Low refrigerant charge, plugged filter drier, partially closed liquid line service valve, or a faulty thermistor or transducer.
77
High Pressure, Circuit B
Circuit B compressor(s) shut
down
78
Supply-Air Fan State and
Status
79
Not used
All unit outputs (except supply fan) turned off. Supply fan
output remains energized.
—
80
Low Saturated Suction
Temperature, Circuit A
Circuit A shut down
Manual
81
Low Saturated Suction
Temperature, Circuit B
Circuit B shut down
Manual
82
High Suction Superheat,
Circuit A
Circuit A shut down
Manual
83
High Suction Superheat,
Circuit B
Circuit B shut down
Manual
84
Circuit A shut down
Manual
Faulty TXV, thermistor, or transducer.
Circuit B shut down
Manual
Faulty TXV, thermistor, or transducer.
86
87
Low Suction Superheat,
Circuit A
Low Suction Superheat,
Circuit B
Illegal Configuration
Not used
Unit will not start
—
Manual
—
88
Hydronic Coil Freeze Stat
Configuration code error.
—
Low temperature outdoor-air used with minimum
airflow.
Unit is in IAQ purge mode with low temperature
outdoor air.
Outdoor-air damper is jammed open.
89
Pressurization
90
Evacuation
91
Smoke Purge
92
Fire Shutdown
93
Linkage Failure
Initializes pressurization
mode.
See Table 24 for hardware
state details.
Initializes evacuation mode.
See Table 24 for hardware
state details.
Initializes smoke purge
mode. See Table 24 for hardware state details.
Unit shuts down. See
Table 24 for hardware state
details.
Unit returns to stand-alone
operation.
94
Building Pressure
Alarm generated.
Automatic
95
Duct Static Pressure
The supply-air fan shuts off
for 5 minutes.
Automatic
96
Not used
—
—
97
Indoor-Air Quality Failure
85
Economizer at minimum position, heating coil valve fully
open, supply-air fan shut off
Alarm generated
Automatic
Automatic
Pressurization alarm tripped. Space being overpressurized to prevent smoke from entering zones.
Automatic
Smoke alarm tripped. Power exhaust/return-air fans
clear smoke from space.
Automatic
Purge alarm tripped. Outdoor air is being supplied
and return air is being exhausted.
Automatic
Fire alarm tripped.
Automatic
Automatic
LEGEND
CCN — Carrier Comfort Network
CV
— Constant Volume
DSIO — High-Voltage Relay Module
IAQ
— Indoor-Air Quality
NTFC — Nighttime Free Cool
PSIO — Processor Module
TSM — Terminal System Manager
TXV
— Thermostatic Expansion Valve
NOTE: Alarms 89-92 are level zero on the CCN Network. All other alarms are level 2.
69
Loose connection, a broken wire, or a loss of communication with the TSM.
Power exhaust fan failure in either the 1⁄4-in. plastic tubing routed to the area to be controlled or the
tubing routed to the atmosphere from the building
pressure control. This alarm is only valid when the
unit is configured for modulating power exhaust or
return-air fan.
Inlet guide vane actuator motor failure; or VFD failure; A leak or obstruction in the 1⁄4-in. plastic tubing routed from the inlet guide vane or VFD duct
pressure trasnducer to the ductwork connection;
All the terminals are closed.
—
IAQ set point is less than the IAQ low reference
generated, or the IAQ priority is configured as low
and the IAQ sensor reading exceeds the IAQ set
point.
outputs will turn on normally after the alarm condition has
been reset. The probable cause for this condition is a faulty
or improperly connected plug, a wiring error, or a faulty
module.
Alarm Code 72 (Loss of Communications With DSIO2) —
If communication is lost with the DSIO2 module, all outputs
controlled by this module will be turned off. This alarm will
reset automatically once the communication is restored. The
outputs will turn on normally after the alarm condition has
been reset. The probable cause for this condition is a faulty
or improperly connected plug, a wiring error, or a faulty
module.
Alarm Code 73 (Loss of Communications With Control Option Board [PSIO2]) — If communication is lost with the
PSIO2 module, all outputs controlled by this module will be
turned off. Reset of this alarm is automatic when the communication is restored.
Start-up after this alarm has been remedied follows a
normal sequence. The probable cause for this condition is a
faulty or improperly connected plug, a wiring error, or a faulty
module.
Alarm Codes 74 and 75 (Low Pressure Circuit A or B)
With low-pressure switches installed — If a circuit is on and
the low-pressure switch is open (opens at 27 psig 6 4 psig)
for 15 seconds, the compressor in that circuit will stop and
the alarm will trip.
NOTE: During initial start-up of a circuit, the low pressure
input will be ignored for 2 minutes.
With a suction transducer installed — If a circuit is on and
the suction pressure drops below 28 psig for 15 seconds, the
compressor in that circuit will stop and the alarm will trip.
Alarm code 74 signals a circuit A failure, and code 75
signals a circuit B failure. The reset for this alarm can be
automatic if the pressure reaches 67 6 7 psig (switch) or
65 psig (transducer) within 5 minutes after the alarm has tripped.
The circuit will not be reset if it trips again after 3 consecutive failures. The possible causes for the alarm are low refrigerant charge, dirty filters, evaporator fan turning backwards,
inlet guide vanes not opening properly, plugged filter drier,
or faulty transducer.
Alarm Codes 76 and 77 (High Pressure Circuit A or B) —
If a compressor trips on compressor fault alarm 51 or 55 and
the discharge pressure for that circuit is greater than 410 psig,
then the high pressure alarm will trip. If the discharge pressure ever exceeds 440 psig, then the alarm will trip and the
appropriate circuit will be shut off.
Alarm code 76 signals a circuit A failure, and alarm
code 77 signals a circuit B failure.
Reset of this alarm is manual. The circuit will start normally after the alarm condition has been corrected. Possible
causes for this alarm are an overcharged system, high outdoor ambient temperature coupled with a dirty outdoor coil,
plugged filter drier, partially closed liquid line service valve,
or a faulty transducer.
NOTE: This alarm is only valid when the unit has refrigerant pressure transducers.
Alarm Code 78 (Supply-Air Fan) — If the commanded state
and status of the supply-air fan do not match for 60 seconds,
the alarm trips. (The control circuit does not detect circuit
breaker failures due to motor overcurrent, shorts or grounds
between the evaporator-fan circuit breaker and motor, circuit breaker trips, or broken belts.) Other possible causes are
fan status switch failure, tubing not properly connected, or
switch set improperly. All other unit outputs except the supplyair fan are turned off when this alarm is generated. The supplyair fan output remains energized.
Reset of this alarm is automatic once the problem is
corrected.
Alarm Code 60 (Return-Air Thermistor Failure) — If the
temperature measured by this thermistor is outside the range
of 240 to 245 F (240 to 118 C), the cooling capacity algorithm will use a default of 8° F per stage drop. Heating
and economizer will be disabled. Reset of this alarm is automatic once the problem is corrected. Start-up follows the
normal sequence. The cause of the alarm is usually a bad
thermistor, a shorted or open thermistor caused by a wiring
error, or a loose connection.
Alarm Code 61 (Outdoor-Air Thermistor Failure) — If the
temperature measured by this thermistor is outside the range
of 240 to 245 F (240 to 118 C), the economizer routine
will use enthalpy input only. If the unit is equipped with humidity sensors, then the enthalpy will also be considered bad
and the economizer will close the dampers. Nighttime free
cooling will also be disabled. Reset of this alarm is automatic once the problem is corrected. Start-up follows the normal sequence. The cause of the alarm is usually a bad thermistor, a wiring error, or a loose connection.
Alarm Codes 62 and 63 (Saturated Condensing Thermistor
Failure) — If the SCT fails (temperature is out of the range
of 240 F to 245 F), the alarm will trip and the appropriate
circuit will shut off. Reset of this alarm is automatic once
the problem is corrected. The unit performs a complete restart when the SCT sensor resets. The cause of the alarm
is usually a bad thermistor, a wiring error, or a loose
connection.
NOTE: This alarm is only valid when the unit has saturated
condensing thermistors.
Alarm Codes 64 and 65 (Suction Thermistor Failure) — If
the temperature measured by this thermistor is outside the
range of 240 to 245 F (240 to 118 C), the high and low
superheat alarms will be disabled and the head pressure algorithm will operate as if the unit did not have suction sensors. Reset of this alarm is automatic once the problem is
corrected. Start-up follows the normal sequence. The cause
of the alarm is usually a bad thermistor, a wiring error, or a
loose connection.
Alarm Code 66 (Space Thermistor Failure) — This alarm
applies to all units. If the temperature measured by this thermistor is outside the range of 210 to 245 F (223 to
118 C), the temperature reset, nighttime free cooling, and
cooling and heating (CV applications only) functions are disabled. Reset of this alarm is automatic once the problem is
corrected, and the reset function will be enabled. The cause
of the alarm is usually a bad thermistor, a wiring error, or a
loose connection.
Alarm Codes 67 through 70 (Transducer Failure) — If the
voltage ratio of a transducer is less than 2% or greater than
98% for 3 seconds, the transducer has failed and the affected
circuit shuts down.
Code 67 — Compressor A1 Discharge Pressure
Transducer Failure
Code 68 — Compressor B1 Discharge Pressure
Transducer Failure
Code 69 — Compressor A1 Suction Pressure
Transducer Failure
Code 70 — Compressor B1 Suction Pressure
Transducer Failure
The reset of this alarm is automatic if the voltage ratio
returns within range. Start-up of this circuit follows a normal sequence. The cause of this error is usually a bad transducer, a bad 5-v power supply, or a wiring error. The failed
transducer should be recalibrated by the control using the
service function before the transducer is considered bad.
Alarm Code 71 (Loss of Communications With DSIO1) —
If communication is lost with the DSIO1 module, all outputs
controlled by this module will be turned off. This alarm will
reset automatically when the communication is restored. The
70
Alarm Code 89 through 92 (Pressurization, Evacuation, Smoke
Purge, and Fire Shutdown, respectively) — When the unit
is equipped with an optional smoke control and a fire system
is installed, these 4 modes are provided to control smoke
within areas serviced by the unit. The unit must be equipped
with an economizer, power exhaust or return-air fan options,
and the control option module to support these modes. The
building fire alarm system closes field supplied, normally open,
dry contacts connected to PSIO2 at plug J7 (bottom) to activate the alarms.
Reset of this alarm is automatic once the problem is
corrected.
Alarm Code 93 (Linkage Failure — DAV System Only) —
A linkage failure alarm is generated when the linkage has
stopped updating the TSM linkage tables within the last
5 minutes.
NOTE: This alarm can only be generated after linkage has
updated the table at least one time since initialization.
The unit controls enter the linkage default mode if the linkage is enabled, but the communications link has been lost.
With the controls having reverted back to stand-alone
operation, the existing sensors, previously overridden by
linkage, will be used. This may be caused by a loose connection or a broken wire.
Reset of this alarm is automatic once the problem is
corrected.
Alarm Code 94 (Building Pressure) — If the building pressure is greater than the building pressure set point plus
0.25 in. wg for 30 seconds, the alarm will be generated. This
may be caused by a power exhaust fan failure or a leak or
obstruction in either the 1⁄4-in. plastic tubing routed to the
area to be controlled or the tubing routed to atmosphere from
the building pressure control. This alarm is valid only when
the unit is configured for modulating power exhaust or returnair fan.
Reset of this alarm is automatic once the problem is
corrected.
Alarm Code 95 (Duct Static Pressure) — If the duct pressure is greater than the static pressure set point plus 1.0 in.
wg for 30 seconds, or equal to or greater than 5.0 in. wg for
15 seconds, then the alarm will trip, and the supply-air
fan will shut off for 5 minutes. This may be caused by variable frequency drive (VFD) or IGV actuator motor failure or
a leak or obstruction in the 1⁄4-in. plastic tubing routed from
the VFD or IGV duct pressure control to the ductwork connection, or all the terminals are closed.
Reset of this alarm is automatic once the problem is
corrected.
Alarm Mode 97 (Indoor-Air Quality Failure) — This alarm
is valid only when the unit is configured with the PSIO2 control option module, the unit is equipped with field-supplied
IAQ sensors, and the VENT option is set at either ‘‘1’’ or ‘‘3’’.
If the IAQ set point (IAQS) is less than the IAQ low reference value or greater than the high reference value, an alarm
will be generated. An alarm will also occur when the IAQ
priority is configured as low and the IAQ sensor reading exceeds the IAQ set point.
Reset of this alarm is automatic once the problem is
corrected.
Alarm Codes 80 and 81 (Low Saturated Suction Temperature) — If the saturated suction temperature is less than
20 F (-6.7 C) for 5 minutes, the alarm trips and the circuit
shuts off.
If the unit is configured for 2-speed fan operation, the fan
must be on high speed for this alarm to be generated. If the fan
is at low speed, the speed will be set to high and the 5 minute
timer will be restarted. The fan will be locked on high speed
until the saturated suction temperature exceeds 65 F.
Alarm code 80 signals a circuit A failure, and alarm code 81
signals a circuit B failure. Reset is manual, and start-up of
the circuit is normal after the alarm has been cleared. Possible causes of the fault condition are a combination of low
entering outdoor-air temperature, low evaporator-fan cfm, low
refrigerant charge, plugged filter drier, partially closed liquid line service valve, or pressure transducer failure.
NOTE: This alarm is valid only when the unit has refrigerant pressure transducers.
Alarm Codes 82 and 83 (High Suction Superheat) — This
alarm is valid only when unit is configured for pressure transducers and suction sensors (thermistors), and mechanical cooling is on.
If the suction superheat is greater than 45 F (7 C) for more
than five minutes, the alarm trips and the circuit shuts down.
Alarm code 82 signals a circuit A failure, and alarm code 83
signals a circuit B failure. Reset of this alarm is manual. The
circuit will start normally after the alarm condition has been
corrected. Possible causes for this alarm are low refrigerant
charge, plugged filter drier, partially closed liquid line service valve, or a faulty thermistor or transducer.
Alarm Codes 84 and 85 (Low Suction Superheat) — This
alarm is valid only when the unit is configured for pressure
transducers and suction sensors (thermistors), and mechanical cooling is on.
If the suction superheat is less than 3 F (216 C) for more
than five minutes, the alarm trips and the affected circuit shuts
down. Alarm code 84 signals a circuit A failure, and alarm
code 85 signals a circuit B failure. Reset of this alarm is manual. Start-up of the circuit is normal after the alarm has been
corrected. Possible causes of the alarm include a faulty thermostatic expansion valve (TXV), thermistor, or transducer.
Alarm Code 86 (Illegal Configuration) — This fault indicates a configuration code error, and the unit is not allowed
to start. Refer to Service Function section and
on
page 80 for factory configuration values and
on
page 80 for user configuration variables. Check all configuration codes and set points and correct any errors.
Alarm Code 88 (Hydronic Coil Freeze Stat) — The hydronic coil freeze stat alarm requires a field supplied, normally open, temperature actuated switch connected to PSIO2
at plug J7 (bottom). The alarm is activated by a 24-v signal
generated by the switch when it closes. The economizer will
be set at minimum position, heating coil valve will be fully
open, and supply-air fan will be shut off. This may be caused
by low temperature outdoor-air used with minimum airflow,
during IAQ purge mode with low temperature outdoor air,
or because the outdoor-air damper is jammed open.
Reset of this alarm is automatic once the problem is
corrected.
71
outside the range of 240 to 245 F (240 to 118.3 C) and
168,250 to 203.75 ohms (outdoor-air temperature, supplyair temperature, saturated condensing temperature, suction
gas temperature, and return-air temperature only), it will be
treated as a sensor failure and a diagnostic code will be displayed. It is also possible to check the operation of the thermistors using the test function.
To check the thermistors:
1. Use the temperature subfunction of the status function
(
) to determine if the thermistors are reading
correctly.
2. Check the thermistor calibration at a known temperature
by measuring actual resistance and comparing the value
measured with the values listed in the thermistor tables
(Tables 55 and 56).
3. Make sure that the thermistor leads are connected to the
proper pin terminals at the PSIO1 and PSIO2 terminal
strip J7 on the processor boards, and that the thermistors
are properly located in the refrigerant circuit.
If a thermistor has failed or the wire is damaged, replace
the complete assembly. Do not attempt to splice the wires or
repair the assembly.
Thermistor Troubleshooting — The unit control system uses thermistors to measure temperatures of the supply
and return air, outdoor air and space temperature, and the
saturated condensing and suction temperatures of the refrigerant circuits. See Table 1 and Fig. 38-40 for thermistor
locations.
The resistance versus temperature and electrical characteristics for thermistors in the system (except space temperature) are identical. To obtain an accurate reading, a highimpedance meter (such as a digital meter) must be used.
Thermistors in the unit control system have a 5-vdc signal
applied across them any time the unit control circuit is energized. The voltage drop across the thermistor is
directly proportional to the temperature and resistance of the
thermistor.
To determine temperatures at the various thermistor
locations:
1. Disconnect the thermistor from the processor board.
2. Measure the resistance across the appropriate thermistor
using a high quality digital ohmmeter.
3. Use the resistance reading to determine the thermistor temperature using Tables 55 and 56.
The microprocessor has been programmed to check the
operation of the thermistors. If the measured temperature is
Table 55 — Thermistor Resistance vs Temperature Values for Thermistors T1-T7 (5K at 25 C Resistors)
TEMP
(F)
225
220
215
210
25
0
5
10
15
20
25
30
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
RESISTANCE
(Ohms)
98010
82627
69790
59081
50143
42678
36435
31201
26804
23096
19960
17297
15027
14614
14214
13833
13449
13084
12730
12387
12053
11730
11416
11111
10816
10529
10250
9979
9717
9461
9213
8973
8739
8511
8291
8076
7868
7665
7468
7277
7091
6911
6735
6564
6399
6237
6081
5929
5781
5637
5497
TEMP
(F)
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
RESISTANCE
(Ohms)
5361
5229
5101
4976
4855
4737
4622
4511
4403
4298
4195
4096
4000
3906
3814
3726
3640
3556
3474
3395
3318
3243
3170
3099
3031
2964
2898
2835
2774
2713
2655
2598
2542
2488
2436
2385
2335
2286
2238
2192
2147
2103
2060
2018
1977
1937
1898
1860
1822
1786
1750
TEMP
(F)
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
72
RESISTANCE
(Ohms)
1715
1680
1647
1614
1582
1550
1519
1489
1459
1430
1401
1373
1345
1318
1291
1265
1239
1214
1189
1165
1141
1118
1095
1072
1050
1028
1007
986
965
945
925
906
887
868
850
832
815
798
782
765
749
734
719
705
690
677
663
650
638
626
614
TEMP
(F)
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
RESISTANCE
(Ohms)
602
591
581
570
560
551
542
533
524
516
508
501
494
487
480
473
467
461
456
450
444
439
434
429
424
419
415
410
405
401
396
391
386
382
377
372
366
361
356
350
344
338
332
325
318
311
304
297
289
282
Table 56 — Thermistor Resistance vs Temperature Values for
Space Temperature Thermistors T-55 and T-56 (10 K at 25 C Resistors)
TEMP
(F)
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
RESISTANCE
(Ohms)
24051
23456
22877
22313
21766
21234
20716
20212
19722
19246
18782
18332
17893
17466
17050
16646
16253
15870
15497
15134
14780
14436
TEMP
(F)
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
RESISTANCE
(Ohms)
14101
13775
13457
13148
12846
12553
12267
11988
11717
11452
11194
10943
10698
10459
10227
10000
9779
9563
9353
9148
8948
8754
TEMP
(F)
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
RESISTANCE
(Ohms)
8563
8378
8197
8021
7849
7681
7517
7357
7201
7049
6900
6755
6613
6475
6340
6209
6080
5954
5832
5712
5595
5481
TEMP
(F)
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
RESISTANCE
(Ohms)
5369
5260
5154
5050
4948
4849
4752
4657
4564
4474
4385
4299
4214
4132
4051
3972
3895
3819
3745
3673
NOTE: Thermistors T6 and T7 are located in the compressor suction service valves.
Sufficient detail is not shown in this figure to include their precise locations.
Fig. 38 — Thermistor T1, T2, and T5 Locations
SIZES 034 AND 038
SIZES 044 AND 048
LEGEND
CKT — Circuit
L.H. — Left Hand
R.H. — Right Hand
Fig. 39 — Thermistor T3 and T4 Locations, Size 034-048 Units; Hairpin End of Coil
73
054
064
074
NOTE: Blank coils are included on size 054, 064 units only for relative position. Detail is provided for coils where thermistors are located.
Fig. 40 — Thermistor T3 and T4 Locations, Size 054-074 Units; Header End of Coil
74
After calibration, the results may be checked by following the steps outlined in Table 58. Pressure readings other
than 0.0 psig indicate that the calibration was unsuccessful.
Repeat the calibration procedure for any value that is greater
than ± 1.0 psig.
After satisfactory calibration of the transducers, reinstall
them on the compressors.
Transducer Troubleshooting — The unit control system may use transducers to measure pressures around the
system. See Table 1 for pressure transducer locations and
Fig. 41 for typical refrigerant pressure transducer. If a transducer is suspected of being faulty, check the voltage to the
transducer. The refrigerant pressure transducer supply voltage should be 5 vdc 6 0.2 v. These transducers convert the
measured refrigerant pressure to a voltage. This voltage is
then evaluated as a ratio to the 5 vdc 6 0.2 v supply voltage.
Read the voltage on channel 12. If the check filter switch is
open, then 5 v is used for the ratio. If the supply voltage is
correct, compare the pressure reading displayed on the HSIO
keypad and the pressure obtained on a calibrated pressure
gage.
NOTE: A 24-vac isolation transformer is required for proper
operation of each field-installed IAQ and humidity sensor.
One transformer is required for each sensor to avoid damage
to refrigerant pressure transducers.
Table 57 — Refrigerant Pressure
Transducer Configuration
KEYPAD
DISPLAY
HSIO ENTRY
ACTION BEING
TAKEN
LOG ON
ENTER
Enter login function
LOGGED ON Logging in
FACT CFG
IMPORTANT: Compressor service valves shut off the
pressure port when backseated. Be sure that service
valves with transducers installed on the pressure
port are not backseated to ensure proper transducer
operation.
Enter factory configuration
function
SPB CALB
ENTER
SPB CALB
Calibrate SPB transducer
SPA CALB
To check the refrigerant pressure transducers:
1. Use the pressure subfunction of the status function
(
and
) to determine if the pressure transducers are reading correctly. Connect a calibrated gage to
the lead compressor suction or discharge pressure connection to check transducer reading.
ENTER
SPA CALB
Calibrate SPA transducer
DPB CALB
ENTER
DPB CALB
Calibrate DPB transducer
DPA CALB
2. Make sure that the transducer leads are properly connected in the junction box and to the PSIO. Check the
transformer TRAN4 output. Check the transducer supply
voltage from PS1. It should be 5 vdc 6 0.2 v. Check the
supply voltage to PSIO channel 12.
ENTER
DPA
DPB
SPA
SPB
—
—
—
—
DPA CALB
Calibrate DPA transducer
LEGEND
Discharge Pressure, Circuit A
Discharge Pressure, Circuit B
Suction Pressure, Circuit A
Suction Pressure, Circuit B
Table 58 — Verification of Refrigerant Pressure
Transducer Calibration
HSIO ENTRY
KEYPAD
DISPLAY
PRESSURE
Fig. 41 — Refrigerant Pressure Transducer
Refrigerant Pressure Transducer Replacement and Calibration — Remove the transducers from
the compressor and allow them to be exposed to atmospheric pressure. Refrigerant ports under transducers have
Schrader-type ports. Follow the steps in Table 57 to calibrate (zero) the transducers.
75
READING NAME
(EXPECTED DISPLAY)
System pressures
DPA X
Discharge pressure, circuit A
(0.0 psig)
SPA X
Suction pressure, circuit A
(0.0 psig)
DPB X
Discharge pressure, circuit B
(0.0 psig)
SPB X
Suction pressure, circuit B
(0.0 psig)
Control Modules
Turn controller power off before servicing controls. This
ensures safety and prevents damage to controller.
PROCESSOR MODULE (PSIO1), CONTROL OPTION
MODULE (PSIO2), AND HIGH-VOLTAGE RELAY MODULES (DSIO1 and DSIO2) — The PSIO and DSIO modules all perform continuous diagnostic evaluations of the
condition of the hardware. Proper operation of these modules is indicated by LEDs (light-emitting diodes) on the front
surface of the DSIOs, and on the top horizontal surface of
the PSIOs.
RED LED — If the red LED is blinking continuously at a
3- to 5-second rate, it indicates proper operation. If it is lighted
continuously, there is a problem requiring replacement of module. If it is off continuously, power should be checked. If
there is no input power, check fuses. If fuse is bad, check for
shorted secondary of transformer or for bad module. On the
PSIO1 module, if the light is blinking at a rate of twice per
second, the module should be replaced.
GREEN LED — On the PSIOs, this is the green LED closest to COMM connectors. The other green LED on the module indicates external communications, when used. Green LED
should always be blinking when power is on. It indicates
modules are communicating properly. If green LED is notblinking, check red LED. If red LED is normal, check module address switches. See Fig. 42. Proper addresses are:
PSIO1 (Processor Module) — 01 (may be different when
CCN connected)
DSIO1 (High-Voltage Relay Module) — 19
DSIO2 (High-Voltage Relay Module) — 49
PSIO2 (Control Options Module) — 31
If all modules indicate communication failure, check COMM
plug on PSIO1 module for proper seating. If a good connection is assured and condition persists, replace PSIO1
module.
If only DSIO(s) or PSIO2 module indicates communication failure, check COMM plug on that module for proper
seating. If a good connection is assured and condition persists, replace DSIO or PSIO2 module(s).
All system operating intelligence rests in PSIO1 module,
the module that controls unit. This module monitors conditions through input and output ports and through DSIO
modules.
The machine operator communicates with microprocessor through keypad and display module (HSIO). Communication between PSIO1 and other modules is accomplished
by a 3-wire sensor bus. These 3 wires run in parallel from
module to module.
On sensor bus terminal strips, terminal 1 of PSIO1 module is connected to terminal 1 of each of the other modules.
Terminals 2 and 3 are connected in the same manner. See
Fig. 43. If a terminal 2 wire is connected to terminal 1, system does not work.
Internal communications between control modules in the
rooftop unit is carried out through the COMM3 communications bus. A 3-wire bus is routed between the COMM3
plugs of each module.
Fig. 42 — Module Address
Selector Switch Locations
LEGEND
HSIO — Keypad and Display Module (Local Interface Device)
Fig. 43 — Sensor Bus Wiring (Communications)
76
The COMM1 communications bus (Fig. 44) is for external communications to other equipment on the bus or to a
computer running Building Supervisor or Service Tool software. A connection is usually made between the PSIO1
COMM1 plug on the rooftop unit, the air terminals, and the
other rooftop units. A plug is provided in the control panel
for connecting the external bus to the rooftop units. The external connection plug is factory wired to the PSIO1 COMM1
plug.
The PSIO1, DSIO1, and HSIO are all powered from a common 21-vac power source which connects to terminals 1 and
2 of power input strip on each module. A separate source of
21-vac power is used to power the DSIO2 module and PSIO2
options module through terminals 1 and 2 on power input
strip.
PROCESSOR MODULE (PSIO1) (Fig. 45)
Inputs — Each input channel has 3 terminals; only 2 of the
terminals are used. Unit application determines which terminals are used.
Outputs — Output is 24 vdc. There are 3 terminals, only 2
of which are used, depending on application. Refer to unit
wiring diagram.
NOTE: Address switches (see Fig. 45) must be set at 01 (different when CCN connected).
HIGH-VOLTAGE RELAY MODULES (DSIO1 and 2)
(Fig. 46)
Inputs — Inputs on strip J3 are discrete inputs (ON/OFF).
When 24-vac power is applied across the 2 terminals in
a channel it reads as an on signal. Zero v reads as an off
signal.
Outputs — Terminal strips J4 and J5 are internal relays whose
coils are powered-up and powered-off by a signal from
microprocessor. The relays switch the circuit to which they
are connected. No power is supplied to these connections by
DSIO modules.
LEGEND
PWR — Power
Fig. 45 — Processor Module (PSIO1)
LEGEND
CB — Circuit Breaker
Fig. 44 — COMM1 Communications Bus Plug
LEGEND
COMM — Communications Bus NO
— Normally Open
NC
— Normally Closed
PWR — Power
Fig. 46 — High-Voltage Relay Modules
(DSIO1 and 2)
77
CONTROL OPTIONS MODULE (PSIO2) — See Fig. 47.
The options module controls the following features:
1. Relative humidity sensor. This feature requires a fieldsupplied, 4-wire, 2 to 10 v RH (relative humidity)
sensor.
2. Outdoor-air cfm sensor. This feature requires a 4-wire,
field-supplied, mass flow sensor to input a 2 to 10 v
signal.
3. Indoor-air quality. This feature uses a field-supplied, 4-wire,
carbon-dioxide sensor to input a 2 to 10 v signal.
4. Fire and smoke routines. This is accomplished through
a field-supplied remote switch input.
5. Humidifier function. This feature provides control of a
field-installed humidifier.
6. Discrete timer output. This output permits control of timed
functions such as parking lot lights.
7. Hydronic valve control. The PSIO2 module provides outputs to control a field-installed hydronic coil valve.
8. Suction gas thermistor input.
9. Freezestat switch input.
10. Supply Air Temperature Reset from external signal. Requires field-supplied 2 to 10 vdc signal.
ACTUATORS — The actuators for these units are positioned by a 4 to 20 mA signal from the microprocessor. The
actuators contain a series of DIP switches that determine the
maximum travel of the actuator.
See Table 59 for the degrees of travel and the correct DIP
(dual in-line package) switch settings for each actuator.
When installing actuator linkage, actuator should be powered to its fully open position. The linkage should then be
connected so that the actuator does not stall against a fully
open damper.
LEGEND
COMM — Communications Bus
PWR
— Power
Fig. 47 — Control Options Module (PSIO2)
Table 59 — Actuator Degrees of Travel and DIP Switch Settings
110
45
70
DIP SWITCH(ES)
OPEN
8 and 10
6 and 10
5 and 10
DIP SWITCHES
CLOSED
All Others
All Others
All Others
45
6 and 10
All Others
60
4 and 10
All Others
ACTUATOR
DEGREES OF TRAVEL
Economizer
Inlet Guide Vanes
Modulating Power Exhaust
Modulating Return Fan
Damper Motor No. 1
Modulating Return Fan
Damper Motor No. 2
78
3. Press ENTER to start the test. The supply fan will start and
VFD will go from 0% speed (default position when unit
starts) to 50% speed or IGVs will go from 0% open to
50% open.
Quick Test — The test function provides a check on control inputs and outputs, and can only be conducted when the
unit is in the standby mode. To put the unit into the
ENTER . Disstandby mode, press
, then
, then
play will read STBY YES.
The test function and associated subfunctions should be
run to check all unit inputs and outputs prior to unit start-up.
Refer to the Test Function section on page 87 for additional
details on the test function and performing quick tests.
4. Press ENTER again to drive the VFD from 50% to
100% speed or IGVs from 50% to 100% open.
5. Press ENTER again to change the VFD from 100% speed
to 0% speed or IGVs from 100% open to 0% open.
NOTE: The VFD is configured such that at 0% speed command from the unit PIC control the supply fan VFD will
run at about 26 Hz. This will narrow the operating range
and improve the control stability.
IMPORTANT: Be sure unit is in the standby mode
(
) PRIOR to initiating the test function. The
standby/run mode under
MUST read STBY
YES. Test mode will not operate unless unit is in standby.
If the unit is equipped with Remote Start, place LOCAL/
REMOTE switch in the LOCAL (off) position.
6. Press
once to scroll down. The display will read
ECON (economizer test).
NOTE: The economizer, heating coil valve, and analog
humidifer tests operate in the same manner as the IGV
test. The PED (modulating power exhaust test) operates in
a similar manner except that the sequence of operation when
pressing the ENTER key is zero to 75% speed (press ENTER once),
75% to 100% speed (press ENTER again), 100% to 20% speed
(press ENTER again), and 20% to 0 speed (press ENTER again).
To operate a test:
1. Enter the desired test subfunction.
2. Press
to scroll to the desired test.
3. Press ENTER to start the test.
Pressing
after a test has started advances the system
to the next test whether the current test has timed out or not.
If the keypad is not used for 10 minutes, the display will
return to the rotating default display. You must press
and ENTER to exit quick test. To restart the test pro cedure, press
. To terminate the quick test press
; EXIT TST
(Discrete outputs) — The factory/field test of discrete outputs enables the discrete outputs. Each output is disabled when the next output is selected by pressing the
or
keys.
will be displayed. Press ENTER and TST CMPL will be displayed, ending the quick test.
(Compressors) — The factory/field test of compressors enables the supply-air fan and sets the variable frequency drives to 30% (if so equipped) when any compressor
is selected. During the compressor test, the compressors will
operate for ten seconds after the fan has been enabled.
NOTE: The service valves must be open, and the crankcase
heaters should be energized for at least 24 hours before performing the compressor tests.
Once a compressor is operated using the test function, it
is not allowed to operate again for 30 seconds. The supplyair fan and inlet guide vanes or variable frequency drives (if
so equipped) are not disabled until the compressor test is
exited.
ENTER to reIMPORTANT: You MUST press
store the unit software to automatic control. To return
ENTER.
unit to run mode (STBY NO), press
If the unit is equipped with Remote Start, place LOCAL/
REMOTE switch in the REMOTE (on) position.
While the unit is in the test function, other functions can
be accessed by pressing the appropriate keys. If a component is operating under a test function, it will remain operating when another function (such as temperatures or pressures under the status function) is accessed. The test function
must be reentered to shut down that component.
(Inputs) — The factory/field test of inputs function
displays the current sensor input value (analog type) or status (discrete type). During the inputs portion of the quick
test, the compressors and fan motors will not operate.
(Analog outputs) — The factory/field test of
analog outputs causes the analog outputs to be cycled to specific output values. Each output is disabled by selecting the
next output (press the
or
key).
(Heat) — During the factory/field test of heat, the
supply-air fan is enabled. As the fan starts, the variable frequency drives are set to 30% open (if so equipped). The heat
interlock relay contacts are switched when any stage of heat
is selected. The test delays approximately 11 seconds after
the fan is enabled and prior to energizing the first selected
heat stage.
NOTE: Any selected heat stage causes that stage to be selected and all other stages will be disabled. The supply-air
fan, variable frequency drives (if so equipped), and heat interlock relay are NOT disabled until the heat test is exited.
(Exit Test) — In order to exit the factory/field
test mode, press ENTER . TST CMPL is displayed, and the
expansion of TST CMPL (press ENTER ) indicates that the quick
test has been terminated.
To test variable frequency drives:
1. Press
. The display will be ANLGOUT.
2. Press
once to scroll down. The display will read
IGV (inlet guide vanes test).
79
Forcing Values — The control unit allows service person to input (or force) values into set points for troubleshooting. By forcing values in submaster reference loops or
input channels, the service person can force the unit control
to respond to different situations which may not occur normally at that time. In this way, operation of the unit and control can be tested. The input channels where forced values
are permitted are identified in the directory tables.
To override an input channel or submaster reference, use
the HSIO to display the current value. Type in the override
value and press the ENTER key. If the override value is within
the allowable range, the value will be accepted. No action
will occur if the value is ouside the acceptable range for that
variable.
The override is removed by pressing the
key. The normal system value will be restored.
1.
2.
3.
4.
To change a configuration:
Display present configuration field.
Enter the new configuration data.
Press ENTER (see Table 62 for more details).
Enable the Data Reset function.
(Element bus address) — The element bus address
subfunction is used to identify the unit address assignment
when the unit is used on a CCN network. The unit address
consists of two parts — a bus address and an element address. When more than one unit is connected to the CCN,
the element addresses must be changed (no two element addresses on the same bus may be the same). Bus and element
addresses must be changed at the HSIO. Range
for bus address to 0 to 239; range for element address is
1 to 239.
CLEAR
(Units of measure) — Measurements can be displayed in either English or SI Metric units. The default is
English. To change units, press
. The display will be
ENTER and the display will
UNIT 0 (English units). Press
change to UNIT 1 (SI Metric units).
SERVICE
History Function — The history function allows the
user to look at unit operational information. See Table 60.
(Alarm history) — This subfunction allows the user
to view the last 9 alarm codes and their descriptions. The
latest (newest) alarm is listed first, followed in succession
by next older alarms. When a new alarm is generated, it is
listed at the top, displacing all earlier alarms down one position, and the last (oldest) alarm is deleted from the display.
Alarms are retained during a loss of power.
(User configuration) — After logging on, this subfunction allows the user to read or change the factory configuration of user options. Table 62 shows the particular factory and user configurations that are factory set.
The majority of user configuration items are self-explanatory.
However, the ventilation control requires the following
information:
0 = economizer minimum position is controlled by minimum position entered.
1 = economizer minimum position is controlled by IAQ set
point.
2 = economizer minimum position is controlled to maintain
a constant outdoor-air cfm set point.
3 = economizer will use the largest of the minimum set points
as stated in 0, 1, and 2 settings above.
(Maintenance history) — The maintenance history
subfunction displays the latest service date. A service technician can enter a new service date through the HSIO keypad. The entry of a service date shall be password protected.
See Service Function section below for more details. The
last 2 service dates are displayed at the building supervisor.
Service Function — The service function allows the
user to view and modify the unit configuration files. Factory,
field, and service configuration data may be viewed, changed,
and/or entered through the keypad and display module. See
Table 61.
(Heating coil) — This subfunction allows the user
to view and modify the factory configuration of the heating
coil.
The fan off value is the supply-air temperature that the
hydronic heating coil valve will modulate open or closed to
maintain during periods when the evaporator fan is off. This
is designed to prevent coil freeze-up during off periods.
(Log on/Log off) — The service function is password protected by a non-changeable password. To log on,
press
and the display will read LOG ON. Press
and the display will change to
LOGGEDON. At this time, configurations may be viewed
ENTER and the disor modified. To log out, press
play will read LOGD OFF.
ENTER
(Cooling coil) — This subfunction is used to read
or change the configuration of the cooling coil parameters.
The high humidity limit is the set point used when the cooling control will be overridden by the humidity control.
(Software version) — This subfunction allows the
user to view information about the software, such as the version number and language options.
(Duct pressure) — This subfunction is used to read
or change the configuration of duct pressure control.
(Economizer) — The economizer subfunction is
used to read or change the configuration of the economizer.
NOTE: The economizer dampers modulate to maintain
a supply-air temperature equal to the damper set point (VAV
only).
(Factory configuration) — This subfunction allows
for factory configuration of the unit size, type, and options.
Under this subfunction, there are a minimum of 7 configuration fields that are configured at the factory.
NOTE: If a processor is replaced in the field, these configuration fields must be configured using the keypad at this
subfunction.
80
Table 60 — History Directory
HISTORY
Subfunction
1
ALARM
HISTORY
Keypad Entry
Display
ALRMHIST
2
MAINTENANCE
HISTORY
Comment
Alarm history
ALARM X
Latest alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
ALARM X
Previous alarm expansion
MTN/HIS
Maintenance history
mm.dd.yy
Latest service date
the configuration of staged heat.
(Building pressure) — This subfunction is used
to read or change the configuration of the building pressure
option.
(Unoccupied free cooling) — This subfunction
is used to read or change the configuration of the unoccupied free cooling option.
(Alert limits) — This is used to read or change
the configuration of the alert limits.
(Heat) — This subfunction is used to read or change
(Service history) — This subfunction is used to
read the unit service history.
(Adaptive optimal start/stop) — This subfunction is used to read or change the configuration of the
adaptive optimal start/stop option. Refer to Carrier Comfort
Network product literature for more information on
configurations.
(Service/Maintenance alert) — This is used to
read or change the configuration of the service maintenance
alert option.
NOTE: When the number of hours the supply-air fan has
been energized reaches the alert limit, alert no. 173 is generated and SMEH 0.0 is displayed, resetting the supply-air
fan’s run time to 0 hours. The supply-air fan cumulative time
energized can also be reset by pressing
and entering
a new service date. This function can be used to monitor
standard service practices, such as lubrication of bearings
and changing or cleaning filters.
(Space temperature reset) — This subfunction is
used to read or change the configuration of the space temperature reset. Refer to the Supply Air Temperature Reset
section on page 29 and Space Temperature Averaging section on page 40 for more information.
(Loadshed) — This subfunction is used to read
or change the configuration of loadshed. Loadshed is used to
define the CCN groups for redline and loadshed functions.
Groups 1 through 16 are acceptable values.
(Override history) — This subfunction is used to
read the status of the timed override history. This value is
cumulative for the current 24-hour period (beginning at midnight).
NOTE: This subfunction is a ‘‘read only’’ option.
(Indoor-air quality) — This subfunction is used
to read or change the configuration of the indoor-air quality
option. Refer to the Indoor-Air Quality section on page 25
for more details.
(Humidity) — This subfunction is used to read
or change the configuration of the humidity option.
81
Table 61 — Service Directory
Subfunction
1
LOG ON/OFF
SERVICE
Display
Keypad Entry
LOG ON
ENTER
LOGGEDON
LOG OFF
ENTER
2
SOFTWARE
VERSION
3
FACTORY
CONFIGURATION
Software version number
FACT CFG
Factory configuration
Unit type (0 = CV, 1 = VAV)
SIZE X
Unit size (034-074)†
ULOP X
Number of unloaders 2/3/4
HPSP X
Head pressure set point (F)
HEAT X
Heat type (0 = None, 1 = Water/Steam, 2 = Elec, 3 = Gas)
HTSG X
Number of heat stages (0 to 5)
TRNS X
Transducer options (0 = No, 1 = Yes)
SF2S X
Two-speed supply-air fan (0 = No, 1 = Yes)
ECON X
Economizer (0 = None, 1, 2 = Air, 3 = Two-Pos)
FANT X
Fan Type (0 = None, 1 = Exh, 2 = Mod Exh, 3 = Mod Rtn)
HUEN X
Humidifier control (0 = None, 1 = Analog, 2 = Discrete)
Data reset (0 = No, 1 = Yes) (Required to save edits)
DPA CALB
Calibrate discharge A pressure sensor
DPB CALB
Calibrate discharge B pressure sensor
SPA CALB
Calibrate suction A pressure sensor
SPB CALB
Calibrate suction B pressure sensor
BUS ADDR
Element bus address
BUS X
Bus number (factory default = 0)
ADR X
Element address (factory default = 1)
USER CFG
HUSN X
ENTER
to log off
500054-XX
6
USER
CONFIGURATION
*An ‘‘X
ENTER
Software version
UNITS X
LEGEND
Adaptive Optimal Start/Stop
Continuous
Constant Volume
Discrete Time Clock Control
Exhaust
Indoor-Air Quality
Minimum Damper Position
Modulating
Nighttime Free Cooling
Outdoor-Air Cfm Control
Outdoor-Air Temperature
Return
Temperature
Variable Air Volume
Press
VERSION
5
UNITS
—
—
—
—
—
—
—
—
—
—
—
—
—
—
ENTER
Logged on okay
Logged off okay
DTRS X
AOSS
CONT
CV
DTCC
EXH
IAQ
MDP
MOD
NTFC
OAC
OAT
RTN
TEMP
VAV
Enter password followed by
LOGD OFF
TYPE X
4
ELEMENT
BUS
ADDRESS
Description
English/metric system (0 = English, 1 = Metric)
User configuration
SUSN X
Humidity sensors (0 = None, 1 = Differential [2 Sensors],
2 = Space Override [1 Sensor])
Suction sensors (0 = No, 1 = Yes)
VENT X
Ventilation control (0 = MDP, 1 = IAQ, 2 = CFM, 3 = All)
MMAS X
Motormaster (0 = No, 1 = Yes)
PURG X
Indoor-air quality (0 = Disable, 1 = Enable)
NTEN X
Nighttime free cool (0 = Disable, 1 = Enable)
’’ in the Keypad Entry column indicates that the reading can be forced by entering a value and
then pressing
ENTER
. The valid force ranges are listed in the Expansion column.
†For unit size 038, enter ‘‘034’’ for SIZE.
For unit size 048, enter ‘‘044’’ for SIZE.
NOTE: If unit is not configured for a certain subfunction, that subfunction will not show up when
scrolling through values.
82
Table 61 — Service Directory (cont)
Subfunction
6
USER
CONFIGURATION
(cont)
Keypad Entry
7
HEATING
COIL
X
ENTER
*
SERVICE (cont)
Display
OSEN X
Description
Adaptive optimal start/stop (0 = Disable, 1 = Enable)
DLEN X
Demand limit (0 = Disable, 1 = Enable)
OHEN X
Occupied heating (0 = Disable, 1 = Enable)
RSEN X
Space temperature reset (0 = Disable, 1 = Enable)
DPEN X
Duct pressure control (0 = Disable, 1 = Enable)
FANM X
Fan mode auto/cont (0 = Auto, 1 = Cont)
TSCH X
Timed override schedules (1 = Unit, 2 = DTCC, 3 = Both)
TOVR X
Timed override value (0 to 4 hours)
LLAG X
Lead/Lag option (0 = Disable, 1 = Enable)
HEATCOIL
Configure heating coil
MLG X
Master loop gain value
SMG X
Submaster gain value
SCV X
Submaster center value
FOV X
Fan off value (F)
SMR X
Submaster reference value
SMR X
Submaster reference value forced (35 to 140 F)
COOLING
8
COOLING
MLG X
Master loop gain value
HHL X
High humidity limit (0 to 99%)
DUCTPRES
9
DUCT
PRESSURE
X
ENTER
*
10
ECONOMIZER
X
ENTER
*
ENTER
*
11
HEAT
X
12
NTFC
ENTER
*
Configure duct pressure control
MLG X
Master loop gain value
SMG X
Submaster gain value
SCV X
Submaster center value
SMR X
Submaster reference value
SMR X
Submaster reference value forced (0.0 to 5.0 in. wg)
ECONMIZR
Configure economizer
MLG X
Master loop gain value
SMG X
Submaster gain value
SCV X
Submaster center value
MDP X
Minimum damper position (percent open)
PES1 X
Power exhaust set point 1
PES2 X
Power exhaust set point 2
SMR X
Submaster reference value
SMR X
Submaster reference value forced (40 to 120)
DPSP X\
X
Configure cooling parameters
DPSP X\
Damper set point (F)
Damper set point forced (45 to 80 F)
OAE X
Outdoor air enthalpy value
RAE X
Return air enthalpy value
HEAT
Configure staged heat
MLG X
Master loop gain value
SMG X
Submaster gain value
SMR X
Submaster reference value
SMR X
Submaster reference value forced (35 to 140)
NTFC
Configure nighttime free cool (NTFC)
NTLO X
83
NTFC lockout temp (min. OAT to operate NTFC F)
Table 61 — Service Directory (cont)
Subfunction
13
AOSS
Keypad Entry
SERVICE (cont)
Display
AOSS
Description
Configure adaptive optimal start/stop
BLDF X
Building factor value (1 to 100; default = 10)
UOCF X
24-hour unoccupied factor (0 to 99; default = 15)
SETB X
Set point bias (0 to 10; default = 2)
OSMT X
Maximum allowable stop time (10 to 120; default = 60)
SPCRESET
14
SPACE
TEMPERATURE
RESET
RTIO X
Reset ratio (0 to 10; default = 3)
LIMT X
Reset limit (0 to 20; default = 10)
LOADSHED
15
LOADSHED
LSGP X
Configure indoor-air quality
LEVEL X
IAQ priority level (1 = high, 2 = medium, 3 = low; default = 2)
IAQS X
IAQ Set point (0 to 5000 ppm; default = 2000)
IAQG X
IAQ gain (22 to 2)
OCS X
Outdoor air cfm set point
OACG X
AOSS
CONT
CV
DTCC
EXH
IAQ
MDP
NTFC
OAC
OAT
RTN
TEMP
VAV
—
—
—
—
—
—
—
—
—
—
—
—
—
LEGEND
Adaptive Optimal Start/Stop
Continuous
Constant Volume
Discrete Time Clock Control
Exhaust
Indoor-Air Quality
Minimum Damper Position
Nighttime Free Cooling
Outdoor-Air Cfm Control
Outdoor-Air Temperature
Return
Temperature
Variable Air Volume
Outdoor air cfm gain (.1 to 2.0)
IVL X
IAQ voltage low point
IRL X
IAQ reference low point
IVH X
IAQ voltage high point
IRH X
IAQ reference high point
IQMX X
IAQ maximum damper position (0 to 100%; default = 50%)
OCMX X
OAC maximum damper position (0 to 100%; default = 50%)
HUMIDITY
X
ENTER
*
*An ‘‘X
ENTER
Configure loadshed
Loadshed group number (1 to 16; default = 1)
IAQ
16
IAQ/CFM
17
HUMIDITY
Configure space temperature reset
Configure humidity
MLG X
Master loop gain value
SMG X
Submaster gain value
SCV X
Submaster center value
SMR X
Submaster reference value
SMR X
Submaster reference value forced (0 to 90)
’’ in the Keypad Entry column indicates that the reading can be forced by entering a value and
then pressing
ENTER
. The valid force ranges are listed in the Expansion column.
†For unit size 038, enter ‘‘034’’ for SIZE.
For unit size 048, enter ‘‘044’’ for SIZE.
NOTE: If unit is not configured for a certain subfunction, that subfunction will not show up when
scrolling through values.
84
Table 61 — Service Directory (cont)
Subfunction
18
BUILDING
PRESSURE
Keypad Entry
X
ENTER
*
SERVICE (cont)
Display
BLD PRES
MLG X
Master loop gain value
SMG X
Submater gain value
SCV X
Submaster center value
SMR X
Submaster reference value
SMR X
Submaster reference value forced (0.0 to 0.5)
BPS X
Building pressure set point (0 to 0.50; default = 0.05)
BPSO X
19
ALERT
LIMITS
Building pressure set point offset (0.05 to 0.50; default = 0.05)
ALRTLIMT
Configure alert limits
SPLO X
Space temp low alert limit/occupied X
SPHO X
Space temp high alert limit/occupied X
SPLU X
Space temp low alert limit/unoccupied X
SPHU X
Space temp high alert limit/unoccupied X
SALO X
Supply air temp low alert limit/occupied X
SAHO X
Supply air temp high alert limit/occupied X
SALU X
Supply air temp low alert limit/unoccupied X
SAHU X
Supply air temp high alert limit/unoccupied X
RALO X
Return air temp low alert limit/occupied X
RAHO X
Return air temp high alert limit/occupied X
RALU X
Return air temp low alert limit/unoccupied X
RAHU X
Return air temp high alert limit/unoccupied X
OATL X
Outdoor air temp low alert limit X
OATH X
Outdoor air temp high alert limit X
RHL X
Relative humidity low alert limit X
RHH X
Relative humidity high alert limit X
ORHL X
Outdoor air relative humidity low alert limit X
ORHH X
Outdoor air relative humidity high alert limit X
SPL X
Static pressure low alert limit X
SPH X
Static pressure high alert limit X
BPL X
Building pressure low alert limit X
BPH X
Building pressure high alert limit X
OACL X
20
SERVICE
HISTORY
21
SERVICE
MAINTENANCE
22
TIMED
OVERRIDE
HISTORY
Description
Configure building pressure
Outdoor air cfm low alert limit X
OACH X
Outdoor air cfm high alert limit X
IAQL X
Indoor-air quality low alert limit X
IAQH X
Indoor-air quality high alert limit X
SERVHIST
Service history
CAT X
Circuit A run time
CBT X
Circuit B run time
SFT X
Supply-air fan run time
CYC X
Cycles stage 0 to stage 1
SRV/MTN
Service maintenance alert
SMAL X
Service/maintenance alert limit (X hrs x 1000)
SMEH X
Service maintenance elapsed hours (X.X x 1000)
OVRDHIST
History of timed overrides
OHR X
Hours of timed overrides
85
Table 62 — Factory/Field Configuration Procedure
KEYPAD ENTRY
DISPLAY
ENTER
ENTER
ENTER
ENTER
COMMENTS
LOG ON
LOGGEDON
Must enter password
FACT CFG
Factory configuration
TYPE 1
Unit type — Enter correct value
TYPE X
CV = 0, VAV = 1
SIZE 24
Unit size — Enter correct value:
SIZE X
034,044,054,064, or 074†
ULOP 2
Number of Unloaders — Enter value:
ULOP X
2, 3, or 4
HPSP 113
ENTER
ENTER
*
Head pressure set point; Default=113 F
HEAT 0
Heat type — Enter correct value:
HEAT X
0=None, 1=Hot Water/Steam, 2 = Elec, 3 = Gas
HTSG 2
Number of Heat Stages; Default: 2 stages (0-5 avail)
TRNS 0
Transducers option — Enter value:
TRNS X
0 = No; 1 = Yes
SF2S 0
Two-Speed Supply-Air Fan; Default = No (0 = No, 1 = Yes)
ECON 0
Economizer Option — Enter value:
ECON X
0 = None, 1,2 = Air, 3 = Two-Position
FANT 0
Fan type — Enter correct value:
FANT X
0 = none, 1 = Exhaust, 2 = Mod Exhaust, 3 = Mod Return
HUEN 0
Humidifier control
ENTER
HUEN X
0 = none, 1 = Analog, 2 = Discrete
ENTER
See Note 2 below
ENTER
ENTER
DTRS
Data reset (0 = No, 1 = Yes)
Edits being inputted; takes approximately 40 seconds.
DPA CALB
ENTER
DPA CALB
Calibrate discharge pressure sensor A
DPB CALB
ENTER
DPB CALB
Calibrate discharge pressure sensor B
SPA CALB
ENTER
SPA CALB
Calibrate suction pressure sensor A
SPB CALB
ENTER
SPB CALB
Calibrate suction pressure sensor B
LEGEND
AOSS
CV
DTCC
ELEC
IAQ
MOD
NTFC
SPT
VAV
—
—
—
—
—
—
—
—
—
c. Read pressure. Pressures before calibration must be in the range of
63 psig (atmosphere).
Adaptive Optimal Start/Stop
Constant Volume
Discrete Time Clock Control
Electric
Indoor-Air Quality
Modulating
Nighttime Free Cool
Space Temperature
Variable Air Volume
d. Press
ENTER
.
e. Reattach to system.
2. Upon completion of the factory/field configuration step, move to the DTRS
(Data Reset) subfunction. Press
ENTER
, and all revised inputs will be
loaded. This procedure takes approximately 40 seconds. The display returns to the default rotating display.
*Alarm 86, illegal configuration, will result if value is not inputted correctly.
†For size 038, use 034. for size 048, use 044.
IMPORTANT: The Data Reset function should be performed
any time one or more of the values is configured. See Note 2
above for more details.
NOTES:
1. Calibration of the pressure transducers is not required unless problems with
the transducers occur or the standard PSIO is replaced. To calibrate pressure transducers:
a. Disconnect from system.
b. Hang in the atmosphere.
86
Table 62 — Factory/Field Configuration Procedure (cont)
KEYPAD ENTRY
DISPLAY
COMMENTS
USER CFG
ENTER
ENTER
ENTER
User configuration
HUSN 0
Humidity sensors; Default = No (0 = No,
1 = Differential [2 sensors], 2 = Space Override [1 sensor])
SUSN 0
Suction sensors (Enter value)
SUSN X
0 = No, 1 = Yes
VENT 0
Ventilation control (Enter value)
VENT X
0 = SPT, 1 = IAQ, 2 = CFM, 3 = All
MMAS 0
Head pressure control function (Enter value)
MMAS X
0 = No, 1 = Yes
IAQ purge enable; Default = Disable (0 = Disable,
1 = Enable)
PURG DIS
*
ENTER
ENTER
*
*
ENTER
ENTER
NTEN DIS
NTFC enable; Default = Disable (0 = Disable, 1 = Enable)
OSEN DIS
AOSS enable; Default = Disable (0 = Disable, 1 = Enable)
DLEN DIS
Demand limit enable; Default = Disable (0 = Disable, 1 = Enable)
OHEN DIS
Occupied heating enable; Default = Disable (0 = Disable, 1 = Enable)
RSEN DIS
Space temperature reset enable; Default = Disable (0 = Disable,
1 = Enable)
DPEN 0
Duct pressure control (Enter value)
DPEN X
0 = Disable, 1 = Enable
FANM 0
Fan Mode (Enter value)
FANM X
0 = Automatic, 1 = Continuous
TSCH 1
Timed Override Schedules (Enter value)
TSCH X
1 = Unit, 2 = DTCC, 3 = Both
TOVR 0
Timed Override Hours (Enter value)
TOVR X
0, 1, 2, 3, or 4
LLAG
Lead/Lag Option; Enter 0 = No or 1 = Yes
LEGEND
AOSS
CV
DTCC
ELEC
IAQ
MOD
NTFC
SPT
VAV
—
—
—
—
—
—
—
—
—
c. Read pressure. Pressures before calibration must be in the range of
63 psig (atmosphere).
Adaptive Optimal Start/Stop
Constant Volume
Discrete Time Clock Control
Electric
Indoor-Air Quality
Modulating
Nighttime Free Cool
Space Temperature
Variable-Air Volume
d. Press
ENTER
.
e. Reattach to system.
2. Upon completion of the factory/field configuration step, move to the DTRS
(Data Reset) subfunction. Press
ENTER
, and all revised inputs will be
loaded. This procedure takes approximately 40 seconds. The display returns to the default rotating display.
*Alarm 86, illegal configuration, will result if value is not inputted correctly.
†For size 038, use 034. for size 048, use 044.
IMPORTANT: The Data Reset function should be performed
any time one or more of the values is configured. See Note 2
above for more details.
NOTES:
1. Calibration of the pressure transducers is not required unless problems with
the transducers occur or the standard PSIO is replaced. To calibrate pressure transducers:
a. Disconnect from system.
b. Hang in the atmosphere.
Test Function — The test function operates the ‘‘quick
test’’ diagnostic program. See Quick Test section on page 79
and Table 63 for full details.
87
Table 63 — Test Directory
TEST
Subfunction
1 INPUTS
Keypad Entry
Display
Expansion (Press
key)
INPUTS
FACTORY/FIELD TEST OF INPUTS
CSA1 X
COMPRESSOR A1 STATUS X
CSB1 X
COMPRESSOR B1 STATUS X
CFA1 X
COMPRESSOR A1 SAFETY X
CFB1 X
COMPRESSOR B1 SAFETY X
IAQ X
INIDOOR AIR QUALITY X
OAC X
OUTSIDE AIR CFM X
SFS X
SUPPLY FAN STATUS X
ENT X
ENTHALPY SWITCH X
RH X
RELATIVE HUMIDITY X
FRZ X
FREEZE STAT X
OARH X
OUTSIDE AIR RELATIVE HUMIDITY X
FLTS X
FILTER STATUS X
EVAC X
EVACUATION X
PRES X
PRESSURIZATION X
PURG X
SMOKE PURGE X
FSD X
FIRE SHUTDOWN X
SCTA X
CIRCUIT A SATURATED CONDENSING TEMP X
STA X
CIRCUIT A SUCTION TEMP X
SSTA X
CIRCUIT A SATURATED SUCTION TEMP X
SHA X
CIRCUIT A SUCTION SUPERHEAT
SCTB X
STB X
CIRCUIT B SATURATED CONDENSING TEMP X
CIRCUIT B SUCTION TEMP X
SSTB X
CIRCUIT B SATURATED SUCTION TEMP X
SHB X
CIRCUIT B SUCTION SUPERHEAT
SAT X
SUPPLY AIR TEMP X
RAT X
RETURN AIR TEMP X
SPT X
SPACE TEMP X
STO X
SPACE TEMPERATURE OFFSET X
OAT X
OUTSIDE AIR TEMP X
CEWT X
CONDENSER ENT WATER TEMP X
DPA X
CIRCUIT A DISCHARGE PRESSURE SENSOR X
SPA X
CIRCUIT A SUCTION PRESSURE SENSOR X
LPA X
CIRCUIT A LOW PRESSURE SWITCH X
DPB X
CIRCUIT B DISCHARGE PRESSURE SENSOR X
SPB X
CIRCUIT B SUCTION PRESSURE SENSOR X
LPB X
CIRCUIT B LOW PRESSURE SWITCH X
BP X
BUILDING PRESSURE X
SP X
STATIC PRESSURE X
*See Quick Test section page 79 for details on correct operation of these tests.
†The supply-air fan is energized at this point and remains on for the duration of the compressor/heat test functions.
**Compressors are energized for 10 seconds.
88
Table 63 — Test Directory (cont)
TEST (cont)
Subfunction
Keypad Entry
2
ANALOG
OUTPUTS
*
Display
ANLGOUT
IGV
ENTER
IGV TST
ECON
ENTER
ECON TST
HCV
ENTER
HCV TST
PERD
ENTER
PERD TST
HUM
ENTER
3
DISCRETE
OUTPUTS
SF TEST
EC2P TEST
MM TEST
FR2 TEST
FR3
ENTER
FR3 TEST
SF2S
ENTER
SF2S TST
EFRF
ENTER
EFRF TST
ULA1
ENTER
ULA1 TST
ULB1
ENTER
ULB1 TST
ULA2
ENTER
ULA2 TST
ULB2
ENTER
ULB2 TST
HUM1
ENTER
HUM1 TST
DTCC
ENTER
DTCC TST
PERD
ENTER
TESTING INLET GUIDE VANES
ECONOMIZER TEST
TESTING ECONOMIZER
HEATING COIL VALVE TEST
TESTING HEATING COIL VALVE
POWER EXHAUST/RETURN DAMPER TEST
TESTING EXHAUST/RETURN DAMPER
HUMIDIFIER 4-20 TEST
FACTORY/FIELD TEST OF DISCRETE OUTPUTS
FR2
ENTER
INLET GUIDE VANES TEST
DISCOUT
MM
ENTER
FACTORY/FIELD TEST OF ANALOG OUTPUTS
TESTING HUMIDIFIER 4-20
EC2P
ENTER
key)
HUM TST
SF
ENTER
Expansion (Press
PERD TST
89
SUPPLY FAN
TESTING SUPPLY FAN
ECONOMIZER 2 POSITION TEST
TESTING ECONOMIZER 2 POSITION
MOTOR MASTER TESTS
TESTING MOTOR MASTER
OUTDOOR FAN 2 TEST
TESTING OUTDOOR FAN 2
OUTDOOR FAN 3 TEST
TESTING OUTDOOR FAN 3
2 SPEED SUPPLY FAN TEST
TESTING 2 SPEED SUPPLY FAN
EXHAUST/RETURN FAN TEST
TESTING EXHAUST/RETURN FAN
UNLOADER A1 TEST
TESTING UNLOADER A1
UNLOADER B1 TEST
TESTING UNLOADER B1
UNLOADER A2 TEST
TESTING UNLOADER A2
UNLOADER B2 TEST
TESTING UNLOADER B2
HUMIDIFIER 1ST STAGE TEST
TESTING HUMIDIFIER 1ST STAGE
DISCRETE TIME CLOCK CONTROL TEST
TESTING DISCRETE TIME CLOCK CONTROL
POWER EXHAUST/RETURN DAMPER TEST
TESTING EXHAUST/RETURN DAMPER
Table 63 — Test Directory (cont)
TEST (cont)
Subfunction
Keypad Entry
4
COMPRESSOR
TESTS
Display
COMPRSR
CPA1†
ENTER
CPA1 TST
CPB1
ENTER
5
HEAT
STAGES
ENTER
CPB1 TST
6
EXIT TEST
ENTER
TESTING COMPRESSOR A1**
COMPRESSOR B1
TESTING COMPRESSOR B1**
STAGE 1 TEST
STG1 TST
STG2 TST
STG3 TST
STG4 TST
HS5
ENTER
COMPRESSOR A1 TEST
FACTORY/FIELD TEST OF HEAT
HS4
ENTER
FACTORY/FIELD TEST OF COMPRESSOR
HS1†
HS3
ENTER
key)
HEAT
HS2
ENTER
Expansion (Press
TESTING HEAT STAGE 1
STAGE 2 TEST
TESTING HEAT STAGE 2
STAGE 3 TEST
TESTING HEAT STAGE 3
STAGE 4 TEST
TESTING HEAT STAGE 4
STAGE 5 TEST
STG5 TST
TESTING HEAT STAGE 5
EXIT TST
EXIT FACTORY/FIELD TEST
TST CMPL
TEST COMPLETE
*See Quick Test section page 79 for details on correct operation of these tests.
†The supply-air fan is energized at this point and remains on for the duration of the compressor/heat test functions.
**Compressors are energized for 10 seconds.
90
APPENDIX
Input/Output Tables, Channels 1-30 (PSIO1, DSIO1)
PSIO1
Channel No.
Inputs
1
2
3†
4†
5†
6†
7
8
9
10
11
12
Outputs
13
14
15
16
17
18
DSIO1
Channel No.
Inputs
19
10
21
22
Outputs
23
24
25
26
27
28
29
30
TERMINAL ID
+
—
J7-2
J7-5
J7-8
J7-8
J7-11
J7-11
J7-13
J7-13
J7-16
J7-16
J7-20
J7-23
J7-25
J7-28
J7-31
J7-33
J7-35
Pin 36
J7-3
J7-6
J7-9
J7-7
J7-12
J7-10
J6-39
J6-40
J6-43
J6-46
J6-48
J6-51
J6-54
J6-38
—
—
J6-47
J6-47
J6-50
J6-53
SIGNAL
Type
Level
Analog
Analog
Analog
Analog
Analog
Analog
Discrete
Analog
Discrete
Analog
Analog
Analog
Analog
Discrete
Analog
Analog
Discrete
Discrete
J7-14
J7-17
J7-17
J7-21
J7-24
J7-26
J7-29
J7-32
J7-36
Discrete
Analog
Analog
Analog
Discrete
Discrete
Discrete
TERMINAL ID
+
—
Varies*
Varies*
Varies*
1-5 vdc
Varies*
1-5 vdc
24 vac
1-5 vdc
24 vac
1-5 vdc
Varies*
Varies*
2-10 vdc
24 vac
2-10 vdc
2-10 vdc
5 vdc
10 vdc
24
10
10
10
24
24
24
vac
vdc
vdc
vdc
vac
vac
vac
TYPE
POINT NAME — ASSIGNMENT
Thermistor, 5K
Thermistor, 5K
Thermistor, 5K
Transducer, Pressure
Thermistor, 5K
Transducer, Pressure
Contact set
Transducer, Pressure
Contact set
Transducer, Pressure
Thermistor, 5K
Thermistor, 10K
Transducer, Pressure
Contact set
Transducer, Pressure
Thermistor, 10K
Contact set
Contact set
SAT — Supply Air Temp
RAT — Return Air Temp
STHA — Saturated Condensing Temp, Ckt 1
DPAV — Discharge Pressure Transducer, Ckt 1
STHB — Saturated Condensing Temp, Ckt 2
DPBV — Discharge Pressure Transducer, Ckt 2
LPA — Low Pressure Switch, Ckt 1
SPAV — Suction Pressure Transducer, Ckt 1
LPB — Low Pressure Switch, Ckt 2
SPBV — Suctiosn Pressure Transducer, Ckt 2
OAT — Outdoor Air Temp
SPT — Space Temp
BP — Building Pressure
ENTH — Enthalpy Switch
SP — Duct Static Pressure (VAV)
STO — Space Temp Offset/T-56
FLTS — Filter Status
SFS — Supply Fan Status
Contact, NO
Proportional, 4-20 mA
Proportional, 4-20 mA
Proportional, 4-20 mA
Contact, NO
Contacts (NO)
Contacts (NO)
MM — MotormasterT/OD Fan Stage 1
ECON — Economizer Damper Position
PED — Power Exhaust Damper Position
IGV — IGV/Inverter/(VAV)
SF2S — Supply Fan Low Speed (CV)
HS1 — Heat Stage 1
HS2 — Heat Stage 2
SIGNAL
Type
Level
TYPE
J3-1
J3-3
J3-5
J3-7
J3-2
J3-4
J3-6
J3-8
Discrete
Discrete
Discrete
Discrete
24
24
24
24
vac
vac
vac
vac
Contact
Contact
Contact
Contact
set
set
set
set
J4-3
J4-3
J4-6
J4-6
J4-9
J4-12
J5-3
J5-6
J5-9
J5-12
J4-2
J4-1
J4-5
J4-4
J4-8
J4-11
J5-2
J5-5
J5-8
J5-11
Discrete
Discrete
Discrete
Discrete
Discrete
Discrete
Discrete
Discrete
Discrete
Discrete
115 vac
115 vac
115 vac
115 vac
24 vac
24 vac
115 vac
115 vac
115 vac
115 vac
Contact
Contact
Contact
Contact
Contact
Contact
Contact
Contact
Contact
Contact
set
set
set
set
set
set
set
set
set
set
POINT NAME —ASSIGNMENT
CPFA1 — Compressor 1 Safety
CPFB1 — Compressor 2 Safety
CPSA1 — Compressor 1 Status
CPSB1 — Compressor 2 Status
(NO)
(NC)
(NO)
(NC)
(NO)
(NO)
(NO)
(NO)
(NO)
(NO)
LEGEND
CV
— Constant Volume
HIR
— Heat Interlock Relay
NC
— Normally Closed
NO
— Normally Open
TEMP — Temperature
VAV
— Variable Air Volume
*Thermistor voltage signals varies according to temperature at thermistor; see Thermistor Characteristic
Tables 55 and 56 for correlation of temperature and volts at these channels.
†When accessory transducer/sensor package has been installed (requires changes in ‘‘Factory Configuration’’ inputs).
**Field-connection from building/energy management system.
††Field-connection to room terminal heating interlock.
UNIT SIZE
HIR Contact
N.O.
N.C.
034-048
TB3
4+5
4+2
054-074
TB2
8+9
8 + 10
91
CMPA1 — Compressor 1
CH1 — Crankcase Heater 1
CMPB1 — Compressor 2
CH2 — Crankcase Heater 2
ULD1 — Unloader U1
UNL2 — Unloader U2
SF — Supply Fan Contactor
EF — Exhaust Fan Contactor
FR2 — Outdoor Fan Contactor, Ckt 1
FR3 — Outdoor Fan Contactor, Ckt 2
APPENDIX (cont)
Input/Output Tables, Channels 31-60 (PSIO2, DSIO2)
PSIO2
Channel No.
Inputs
31
32
33
34
35
36
37
38
39
40
41
42
Outputs
43
44
45
46
47
48
DSIO2
Channel No.
Inputs
49
50
51
52
Outputs
53
54
55
56
57
58
59
60
TERMINAL ID
+
−
Type
SIGNAL
Level
J7-2
J7-5
J7-7
J7-10
J7-13
J7-16
J7-19
J7-22
J7-25
J7-28
J7-31
J7-34
J7-3
J7-6
J7-8
J7-11
J7-14
J7-17
J7-32
J7-32
J7-32
J7-32
J7-32
J7-35
Analog
Analog
Analog
Analog
Analog
Analog
Discrete
Discrete
Discrete
Discrete
Discrete
Analog
Varies*
Varies*
2-10 vdc
2-10 vdc
2-10 vdc
2-10 vdc
24 vac
24 vac
24 vac
24 vac
24 vac
2-10 vdc
J6-37
J6-42
J6-43
J6-45
—
—
—
J6-38
J6-41
J6-44
J6-44
—
—
—
Analog
Discrete
Analog
Discrete
—
—
—
10 vdc
24 vac
10 vdc
TERMINAL ID
+
—
—
—
—
SIGNAL
Type
Level
TYPE
PONT NAME — ASSIGNMENT
Thermistor, 5K
Thermistor, 5K
Analog
Analog
Analog
Analog
Contact, NO
Contact, NO
Contact, NO
Contact, NO
Contact, NO
Analog
STA — Suction Gas Temperature, Ckt 1
STB — Suction Gas Temperature, Ckt 2
OARH — Outdoor Relative Humidity
RH — Space/Return Relative Humidity
OAC — Outdoor Air CFM
IAQ — Indoor Air Quality
PRES — Pressurization
PURG — Smoke Purge
EVAC — Evacuation
FSD — Fire Shutdown
FRZ — Freeze Stat
SATRV — Supply Air Reset
Proportional, 4-20 mA
Contact, NO
Proportional, 4-20 mA
Contact, NO
—
—
—
HCV — Heating Coil Valve
DTCC — Discrete Timeclock Control
HUM — Analog Humidifier
HUM — Discrete Stage Humidifier
(Not used)
(Not used)
(Not used)
TYPE
J3-1
J3-3
J3-5
J3-7
J3-2
J3-4
J3-6
J3-8
Discrete
—
—
—
24 vac†
—
—
—
Discrete
—
—
—
J4-3
J4-6
J4-9
J4-12
—
—
—
J5-12
J5-12
J4-2
J4-5
J4-8
J4-11
—
—
—
J5-11
J5-10
Discrete
Discrete
Discrete
Discrete
—
—
—
Discrete
Discrete
115 vac
115 vac
24 vac
24 vac
—
—
—
115 vac††
115 vac††
Contact,
Contact,
Contact,
Contact,
—
—
—
Contact,
Contact,
POINT NAME — ASSIGNMENT
EXTCLK — Remote Occupied/Unoccupied
(Not used)
(Not used
(Not used)
NO
NO
NO
NO
NO
NC
ALARMLT — Alarm Light, Discrete
ALERTLT — Alert Light, Discrete
ULDA2 — Unloader U1A
ULDB2 — Unloader U2A
(Not used)
(Not used)
(Not used)
HIR — Heat Interlock Relay††
LEGEND
CV
— Constant Volume
HIR
— Heat Interlock Relay
NC
— Normally Closed
NO
— Normally Open
TEMP — Temperature
VAV
— Variable Air Volume
*Thermistor voltage signals varies according to temperature at thermistor; see Thermistor Characteristic
Tables 55 and 56 for correlation of temperature and volts at these channels.
†When accessory transducer/sensor package has been installed (requires changes in ‘‘Factory Configuration’’ inputs).
**Field-connection from building/energy management system.
††Field-connection to room terminal heating interlock.
UNIT SIZE
HIR Contact
N.O.
N.C.
034-048
TB3
4+5
4+2
054-074
TB2
8+9
8 + 10
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
PC 111
Catalog No. 564-989
Printed in U.S.A.
Form 48/50F,J,N-1T
Pg 92
6-98
Replaces: 48/50NB,NP-1T
Tab 1a 1b