48/50HJ004---014, 50HJQ004---012, 48/50HE003---006
50HEQ003---006, 48/50TM004---014
RTU---MP (Multi---Protocol) 2.x Controller
BACnet, Modbus, Johnson N2, and LonWorks
Controls, Start---Up, Operation and
Troubleshooting Instructions
TABLE OF CONTENTS
START--UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 2
Field Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
ACCESSORY/SENSOR INSTALLATION . . . . . . . . . . . . . . . . 2
Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Field--Supplied Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Install Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Space Temperature (SPT) Sensor Installation . . . . . . . . . . . . 5
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Indoor Air Quality CO2 Sensor Installation (IAQ) . . . . . . . . 7
IAQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Outdoor Air Quality CO2 Sensor Installation (OAQ) . . . . . . 7
Clock Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Outdoor Air Temperature Sensor . . . . . . . . . . . . . . . . . . . . 10
UserPW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Space Relative Humidity Sensor (SPRH) . . . . . . . . . . . . . . 12
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Outdoor Air Relative Humidity Sensor (OARH) . . . . . . . . 12
Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connect Discrete Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Indoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Humidistat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fire Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Fan Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Remote Occupancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Indoor Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Enthalpy Switch/Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Outdoor Enthalpy Control . . . . . . . . . . . . . . . . . . . . . . . . . 14
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Differential Enthalpy Control . . . . . . . . . . . . . . . . . . . . . . . 14
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Enthalpy Switch/Receiver Jumper Settings . . . . . . . . . . . . . 15
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Enthalpy Sensor Jumper Settings . . . . . . . . . . . . . . . . . . . . 15
Communication LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Communication Wiring--Protocols . . . . . . . . . . . . . . . . . . . . . 15
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Third Party Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
BACnet MS/TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
APPENDIX A: DISPLAY TABLES . . . . . . . . . . . . . . . . . 26--32
Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Johnson N2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
LonWorks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Local Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SAFETY CONSIDERATIONS
ACCESSORY/SENSOR INSTALLATION
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform the basic maintenance functions
of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe precautions
in the literature, tags and labels attached to the unit, and other
safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves.
Field accessories for the RTU--MP include a room sensor,
communication wiring, humidistat or relative humidity sensor and
indoor and outdoor air quality.
All field control wiring that
connects to the RTU--MP must be routed through the raceway built
into the corner post as shown in Fig. 2. The raceway provides the
UL required clearance between high--and low--voltage wiring.
Pass the control wires through the hole provided in the corner post,
then feed the wires thorough the raceway to the RTU--MP.
Connect the wires to the removable Phoenix connectors and then
reconnect the connectors to the board.
NOTE: For rooftop unit installation, refer to base unit installation
instructions.
.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Disconnect all power to the unit before performing
maintenance or service. Unit may automatically start if
power is not disconnected.
GENERAL
The RTU--MP controller is an integrated component of the Carrier
rooftop unit. Its internal application programming provides
optimum performance and energy efficiency. RTU--MP enables
the unit to run in 100% stand--alone control mode or it can
communicate to the Building Automation System (BAS).
On--board DIP switches allow you to select your protocol (and
baud rate) of choice among the four most popular protocols in use
today: BACnet, Modbus, Johnson N2 and LonWorks. (See Fig.
19.)
Carrier’s diagnostic display tools such as BACview6 Handheld or
Virtual BACview can be used with the RTU--MP controller.
Access is available via a 5--pin J12 access port.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Disconnect electrical power and use lock--out tags
before wiring the RTU--MP controller.
Field--Supplied Hardware
The RTU--MP controller is configurable with the following
field-supplied sensors:
NOTE:
Supply air temperature sensor (33ZCSENSAT) is
factory--installed.
S space temperature sensor 33ZCT55SPT, 33ZCT56SPT, or
33ZCT59SPT
S indoor air quality sensor (33ZCSENCO2, 33ZCT55CO2,
33ZCT56CO2, ) required only for demand control ventilation.
A dedicated 24-vac transformer is required.
S outdoor air quality sensor (33ZCTSENCO2) required only for
demand control ventilation
S CO2 aspirator box (C33ZCCASPCO2) required for CO2 return
duct/outside air applications
S outdoor air temperature sensor (33ZCSENOAT)
(factory supplied with Economizer)
S outdoor air enthalpy switch (33CSENTHSW)
S return air enthalpy sensor (33CSENTSEN)
S space relative humidity sensor (33ZCSENSRH--01)
S outdoor relative humidity (332CSENORH--01)
S humidistat (TSTATCCPLH01--B)
S filter status switch (33CSFS----01)
S fan status switch (33CSAS----01 or field supplied rated at 24
VAC dry contact CRSTATUS001A00)
User Interface
S BACview6 Handheld
S Virtual BACview
For specific details about sensors, refer to the literature supplied
with the sensor.
2
RTU-- MP
C07467
Fig. 1 -- RTU--MP Control Module
3
Table 1 – RTU--MP Controller Inputs and Outputs
POINT NAME
RTU-- MP
Space Temperature Sensor
Supply Air Temperature
Local Outside Air Temperature Sensor
Space Temperature Offset Pot
Indoor Air Quality
Outdoor Air Quality
Safety Chain Feedback
Compressor Safety
Fire Shutdown
Enthalpy Switch
Humidistat Input Status
Space Relative Humidity
Outside Air Relative Humidity
Supply Fan Status
Filter Status
Remote Occupancy Input
Economizer Commanded
Position
Supply Fan Relay State
Compressor 1 Relay State
Compressor 2 Relay State
Heat Stage 1 Relay State
Heat Stage 2 Relay State
Power Exhaust Relay State
Dehumidification Relay State
BACnet OBJECT NAME
TYPE OF I/O
INPUTS
sptsens
AI (10K Thermistor)
sat
AI (10K Thermistor)
oatsens
AI (10K Thermistor)
sptopot
AI (100K Potentiometer)
iaq
AI (4--- 20 ma)
oaq
AI (4--- 20 ma)
safety
DI (24 VAC)
compstat
DI (24 VAC)
firedown
DI (24 VAC)
enthalpy
DI (24 VAC)
humstat
DI (24 VAC)
CONFIGURABLE INPUTS*
sprh
AI (4--- 20 ma)
oarh
AI (4--- 20 ma)
fanstat
DI (24 VAC)
filtstat
DI (24 VAC)
remocc
DI (24 VAC)
OUTPUTS
econocmd
4--- 20ma
sf
comp_1
comp_2
heat_1
heat_2
aux_2
humizer
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC, 1A)
LEGEND
AI --- Analog Input
AO --- Analog Output
DI --- Discrete Input
DO --- Discrete Output
*These inputs (if installed) take the place of the default input on the specific
channel according to schematic.
Parallel pins J5 ---1 = J2 ---6, J5 ---3 = J1 ---10, J5 ---5 = J1 ---2 are used for field
installation.
Refer to the input configuration and accessory sections for more detail.
4
CONNECTION PIN NUMBERS
J20--- 1, 2
J2--- 1, 2
J2--- 3, 4
J20--- 3
J4--- 2, 3
J4--- 5, 6
J1--- 9
J1--- 2
J1--- 10
J2--- 6, 7
J5--- 7, 8
J4--- 2,3 or J4--- 5,6
J5--- 1,2 or J5--- 3,4 or
J5 5,6 or J5--- 7,8
J2--- 5
J1--- 4
J1--- 8
J1--- 7
J1--- 6
J1--- 5
J11--- 3
J11--- 7, 8
Field connection terminals are removable
for easy wiring
Low voltage
field wiring
conduit
Low voltage divider
RTU-- MP
Field
wiring
Temporary
computer
connection
C07164
Fig. 2 -- Field Control Wiring
Install Sensors
The RTU--MP controller requires the installation of a space
temperature sensor and the operation of a supply air sensor (factory
installed). An outdoor air sensor is required for economizer
operation. Two analog sensors can be installed and configured,
which can consist of an indoor air quality, outdoor air quality,
space relative humidity, or outdoor relative humidity sensor. See
Fig. 1, Table 1, and Fig. 7 for wiring and pin reference. Refer to
the instructions supplied with individual sensors for additional
information.
NOTE: All sensors are field--installed accessories except where
noted.
Space Temperature (SPT) Sensor Installation
There are three types of SPT sensors available from Carrier: the
33ZCT55SPT space temperature sensor with timed override
button, the 33ZCT56SPT space temperature sensor with timed
override button and set point adjustment, and the 33ZCT59SPT
space temperature sensor with LCD screen, override button, and set
point adjustment.
The space temperature sensors are used to measure the building
interior temperature. Sensors should be located on an interior
building wall. The sensor wall plate accommodates the NEMA
(National Electrical Manufacturers Association) standard 2 x 4
junction box. The sensor can be mounted directly on the wall
surface if acceptable by local codes.
Do not mount the sensor in drafty locations such as near air
conditioning or heating ducts, over heat sources such as baseboard
heaters, radiators, or directly above wall-mounted lighting
dimmers. Do not mount the sensor near a window which may be
opened, near a wall corner, or a door. Do not mount the sensor in
direct sunlight. Sensors mounted in these areas will have
inaccurate and erratic sensor readings.
The sensor should be mounted approximately 5 ft from the floor,
in an area representing the average temperature in the space. Allow
at least 4 ft between the sensor and any corner and mount the
sensor at least 2 ft from an open doorway. The SPT sensor wires
are to be connected to terminals in the unit main control board.
5
BRN (COM)
BLK (STO)
BLU (SPT)
OR
1
2
3
4
5
SET
SEN
OPB
COM- PWR+
SENSOR
WIRING
6
SEN
SW1
BRN (GND)
BLU (SPT)
SENSOR WIRING
RTU-- MP
24 VAC
POWER
WIRING
NOTE: Must use a separate isolated transformer.
C07132
Fig. 5 -- Space Temperature Sensor
Typical Wiring (33ZCT59SPT)
C07130
Fig. 3 -- Space Temperature Sensor
Typical Wiring (33ZCT55SPT)
1
2
3
4
SEN
SW1
5
6
SET
BLK
(T56)
BRN (GND)
BLU (SPT)
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
Cool
Install the sensor as follows:
1. Locate the two Allen type screws at the bottom of the sensor.
2. Turn the two screws clockwise to release the cover from the
sensor wall mounting plate.
3. Lift the cover from the bottom and then release it from the
top fasteners.
4. Feed the wires from the electrical box through the opening
in the center of the sensor mounting plate.
5. Using two no. 6-32 x 1 mounting screws (provided with the
sensor), secure the sensor to the electrical box.
NOTE: Sensor may also be mounted directly on the wall using 2
plastic anchors and 2 sheet metal screws (field-supplied).
6. Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three-conductor shielded cable for the sensor and set point
adjustment connections. If the set point adjustment (slidebar) is not required, then an unshielded, 18 or 20 gauge,
two-conductor, twisted pair cable may be used.
7. Replace the cover by inserting the cover at the top of the
mounting plate first, then swing the cover down over the
lower portion. Rotate the two Allen head screws counterclockwise until the cover is secured to the mounting plate
and locked in position.
NOTE: See Table 2 for thermistor resistance vs temperature
values.
Warm
C07131
Fig. 4 -- Space Temperature Sensor
Typical Wiring (33ZCT56SPT)
6
TEMP
(C)
TEMP
(F)
RESISTANCE
(Ohms)
–40
–35
–30
–25
–20
–15
–10
–5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
–40
–31
–22
–13
–4
5
14
23
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
335,651
242,195
176,683
130,243
96,974
72,895
55,298
42,315
32,651
25,395
19,903
15,714
12,494
10,000
8,056
6,530
5,325
4,367
3,601
2,985
2,487
2,082
1,752
Wiring the Space Temperature Sensor
To wire the sensor, perform the following (See Fig. 3, 4 and 5.):
1. Identify which cable is for the sensor wiring.
2. Strip back the jacket from the cables for at least 3 inches.
Strip 1/4-in. of insulation from each conductor. Cut the
shield and drain wire from the sensor end of the cable.
3. Connect the sensor cable as follows:
a. Connect one wire from the cable to (BLU) wire on
J20--1 analog connector on the controller. Connect the
other end of the wire to the left terminal on the SEN
terminal block of the sensor.
b. Connect another wire from the cable to (BRN) J20--2
analog connector on the controller. Connect the other
end of the wire to the remaining open terminal on the
SEN terminal block. On the 33ZCT59SPT sensor, connect this cable to the 24-v COM terminal. A separate
24-vac transformer is required for this sensor. (See Fig.
5.)
c. On 33ZCT56SPT and 33ZCT59SPT sensors, connect
the remaining wire to the (BLK) SPTO on J20--3 connector on the controller. Connect the other end of the
wire to the SET terminal on the sensor.
d. In the control box, install a no. 10 ring type crimp lug
on the shield drain wire. Install this lug under the
mounting screw of the RTU--MP controller.
e. On 33ZCT56SPT sensors, install a jumper between the
two center terminals (right SEN and left SET). (See Fig.
4.)
NOTE: See Fig. 6 for space temperature sensor averaging.
T55/56 Override button will no longer function when sensors are
averaged. Only Sensor 1 T56 STO input can be used.
Do not mount the sensor in direct sunlight. Inaccurate readings
may result. Do not mount the sensor near the exhaust from
air-handling units or compressors, near leakage drafts of indoor air,
or near shrubbery or trees, or under direct water runoff.
Indoor Air Quality CO2 Sensor Installation (IAQ)
The indoor air quality sensor accessory monitors carbon dioxide
CO2 levels. This information is used to monitor IAQ levels. Three
types of sensors are provided. The wall sensor can be used to
monitor the conditioned air space. Sensors use infrared technology
to measure the levels of CO2 present in the air. The wall sensor is
available with or without an LCD readout to display the CO2 level
in ppm.
The CO2 sensors are all factory set for a range of 0 to 2000 ppm
and a linear mA output of 4 to 20. Refer to the instructions
supplied with the CO2 sensor for electrical requirements and
terminal locations.
To accurately monitor the quality of the air in the conditioned air
space, locate the sensor near a return air grille (if present) so it
senses the concentration of CO2 leaving the space. The sensor
should be mounted in a location to avoid direct breath contact.
Do not mount the IAQ sensor in drafty areas such as near supply
ducts, open windows, fans, or over heat sources. Allow at least 3 ft
between the sensor and any corner. Avoid mounting the sensor
where it is influenced by the supply air; the sensor gives inaccurate
readings if the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air before it
is drawn into the return airstream.
Wiring the Indoor Air Quality Sensor
To wire the sensors after they are mounted in the conditioned air
space or outdoor location, see the instructions shipped with the
sensors. For each sensor, use two 2-conductor 18 AWG (American
Wire Gauge) twisted-pair cables (unshielded) to connect the
separate isolated 24 vac power source to the sensor and to connect
the sensor to the control board terminals. To connect the sensor to
the control, identify the positive (4 to 20 mA) and ground (SIG
COM) terminals on the sensor. Connect the 4-20 mA terminal to
terminal IAQ (J4--2) and connect the SIG COM terminal to
terminal GND (J4--3).
Combination Temperature and CO2 Sensor
If using a combination temperature and CO2 sensor
(33ZCT55CO2 or 33ZCT56CO2), refer to the installation
instructions provided with the sensor. See Fig. 2 and 7 for wiring.
Outdoor Air Quality CO2 Sensor Installation (OAQ)
The Outdoor Air CO2 sensor is designed to monitor carbon
dioxide (CO2) levels in the air and interface with the ventilation
damper in an HVAC system. The OAQ sensor is packaged with an
outdoor cover. (See Fig. 8 and 9.)
The outdoor air CO2 sensor must be placed in an area that is
representative of the outdoor air not affected by building exhaust
air or vehicle exhaust.
7
RTU-- MP
Table 2 – Thermistor Resistance vs Temperature Values
for Space Temperature Sensor, Supply Air
Temperature Sensor, and Outdoor
Air Temperature Sensor
J20
1
2
RED
RED
BLK
BLK
RED
RED
RED
BLK
BLK
BLK
SENSOR 1
SENSOR 2
SENSOR 3
SENSOR 4
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION
J20
RED
RED
RED
BLK
BLK
BLK
BLK
SENSOR 1
SENSOR 3
SENSOR 2
RED
BLK
RTU-- MP
2
RED
1
RED
RED
BLK
BLK
SENSOR 4
LEGEND
Factory Wiring
SENSOR 6
SENSOR 5
RED
RED
BLK
BLK
Field Wiring
SENSOR 8
SENSOR 7
SENSOR 9
SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION
C07133
Fig. 6 -- Space Temperature Averaging
8
9
For Single Compressor Units (Non--Heat Pump Type)
LEGEND
--- --- --- --- Field Supplied Wiring
_______ Factory Wiring
Fig. 7 -- RTU--MP Controller Wiring
C07148
RTU-- MP
For All Other Units
Field Supplied Device
50HJ542479 Rev. 4
Economizer Plug Connection
C07171
C07147
Outdoor Air Temperature Sensor (Fig. 10-- 13)
+ 0-10VDC
- SIG COM (J4-6)
+ 4-20mA (J4-5)
ALARM
NC
COM RELAY
CONTACTS
NO
}
2 1
8765432 1
RTU-- MP
H G 24 VAC
OR
+ - 24 VDC
C07134
Fig. 8 -- Indoor/Outdoor Air Quality (CO2) Sensor
33ZCSENC02) -- Typical Wiring Diagram
The OAT sensor is factory installed for units with an economizer.
The OAT sensor must be located properly. For outdoor locations
use sensor 33ZCSENOAT. For duct mounting in the fresh air
intake, use sensor 33ZCSENPAT. The sensor must be installed
immediately upstream from outdoor air damper where it will
accurately sense the temperature of the outdoor air entering the
mixing box. (See Fig. 10 and 11.) For applications without
economizer, the sensor may be located in the outdoor air--duct near
the outdoor air intake (Fig. 10) or on the exterior of the building
(Fig. 10). The thermistor has a range of –40_ to 245_F and a
resistance of 10,000 ohms at 77_F.
If the sensor is to be mounted in the outdoor air duct, use the
33ZCSENPAT sensor which has a 2 x 4-in. by 11/2-in. deep
electrical box. Remove the cover and enter the knockout from the
rear of the box. Install the sensor through the opening so that the
sensor leads are inside the electrical box. Secure the sensor to the
electrical box using a field-supplied 1/2-in. conduit nut. Drill a
1/ -in. hole in the outdoor air duct about a foot upstream of the
2
outdoor air damper. Apply a 1/4-in. bead of silicone type sealer
around the opening and install the sensor through the hole. Secure
the electrical box to the duct using 2 field-supplied, No. 10 sheet
metal screws. (See Fig. 13.)
C07136
COVER REMOVED
Fig. 10 -- Outdoor Air Temperature Sensor
Installation -- Located on Building Wall
(P/N 33ZCSENOAT)
SIDE VIEW
C07135
Fig. 9 -- Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO2 Sensor
Power requirements are 18 to 36 VAC RMS 50/60 Hz; 18 to 42
vdc polarity protected/dependent; and 70 mA average, 100 mA
peak at 24 vdc. All system wiring must be in compliance with all
applicable local and national codes. A dedicated power supply is
required for this sensor. A two-wire cable is required to wire the
dedicated power supply for the sensor. The two wires should be
connected to the power supply and terminals 1 and 2. To connect
the sensor to the control, identify the positive (4 to 20 mA) and
ground (SIG COM) terminals on the sensor. Connect the 4 to 20
mA terminal OAQ terminal J4-5. Connect the SIG COM terminal
to terminal GND (BRN) terminal J4--6. (See Fig. 7.)
RETURN
AIR
OAT
OUTDOOR
AIR
ROOF TOP
UNIT
C07137
Fig. 11 -- OAT Sensor Installation in Outside
Air Duct (P/N 33ZCSENPAT)
10
2.8125 IN.
(71.4 mm)
GROUND
SCREW
4.5625 IN.
(115.9 mm)
2.0000 IN.
(50.8 mm)
SINGLE-GANG
ALUMINUM
BELL BOX
FOAM COVER
GASKET
RTU-- MP
0.5000 IN.
(12.7 mm) NPT
THREADED
CONDUIT
OPENINGS TYP.
ALUMINUM
COVER
4.9200 IN.
(125.0 mm)
C07138
Fig. 12 -- Outdoor Air Temperature Sensor (P/N 33ZCSENOAT)
33ZCSENPAT SENSOR
DUCT MOUNTED
LEGEND
OA — Outdoor Air
OAT — Outdoor Air Temperature
C07139
Fig. 13 -- Outdoor Air Temperature Sensor Installation -- Located in Outdoor Air Duct (P/N 33ZCSENPAT)
11
Space Relative Humidity Sensor (SPRH)
The accessory space humidity sensor is installed on an interior wall
to measure the relative humidity of the air within the occupied
space.
The use of a standard 2 x 4--in. electrical box to accommodate the
wiring is recommended for installation. The sensor can be mounted
directly on the wall, if acceptable by local codes.
!
MOUNTING
HOLES
Io
Vin
Gnd
WIRING
OPENING
Vo
CAUTION
EQUIPMENT DAMAGE HAZARD
4
5
6
RTU-- MP
3
ON
DO NOT mount the sensor in drafty areas such as near
heating or air--conditioning ducts, open windows, fans, or
over heat sources such as baseboard heaters, radiators, or
wall--mounted light dimmers. Sensors mounted in those
areas will produce inaccurate readings.
SW2
2
Do NOT clean or touch the sensing element with chemical
solvents as they can permanently damage the sensor.
1
Failure to follow this caution may result in equipment
damage.
a33-9141
Vin - J4 -1 or J4 -4 24Vdc
Io - J4 -2 or J4 -5 4 -20mA output
If the sensor is installed directly on a wall surface, install the
humidity sensor using 2 screws and 2 hollow wall anchors
(field--supplied). Do not over tighten screws. (See Fig. 14.)
The sensor must be mounted vertically on the wall. The Carrier
logo should be oriented correctly when the sensor is properly
mounted.
Avoid corner locations. Allow at least 4 ft between the sensor and
any corner. Airflow near corners tends to be reduced, resulting in
erratic sensor readings. The sensor should be vertically mounted
approximately 5 ft up from the floor, beside the space temperature
sensor.
For wiring distances up to 500 feet, use a 3--conductor, 18 or 20
AWG cable. A shielded cable can be used, although the shield is
not required. The shield must be removed from the sensor end of
the cable if this cable is used.
The power for the sensor is provided by the RTU--MP control on
terminal J4--4 Input 1 is used or J4--1 if Input 2 is used. To wire the
sensor perform the following:
1. At the sensor, remove 4--in. of jacket from the cable. Strip
1/4--in. of insulation from each conductor. Route the cable
through the wire clearance opening in the center of the
sensor. (See Fig. 14.)
2. Connect a field--supplied BLACK wire to the sensor screw
terminal marked Vin.
3. Connect a field--supplied RED wire into the sensor screw
terminal marked Io.
4. At the RTU--MP controller, route the cable away from high
voltage wiring and disconnect the power to prevent
accidental shorting or grounding of wires when connecting
the sensor. Remove the J4 Molex female plug.
5. Connect the field--supplied RED wire from the sensor to
J4--5 if Input 1 is used or J4--2 if Input 2 is used.
6. Connect the field--supplied BLACK wire from the sensor to
J4--4 if Input 1 will be used of J4--1 if Input 2 will be used.
C07201
Fig. 14 -- Humidity Sensor Installation
Outdoor Air Relative Humidity Sensor (OARH)
The outdoor air relative humidity sensor accessory monitors
moisture levels in the atmosphere. This information is used to
determine whether the economizer (if installed) will open during
the free cooling mode.
The RH transmitter should be mounted so that the unit is under an
eave and protected from the elements and direct sunlight.
Install the sensor as follows:
1. Using two #8 x 3/4” self--tapping TEK mounting screws
included with the sensor, secure the sensor.
2. Remove the cover and install conduit connectors, watertight
fittings, and or 1/2” vent plug.
Note that the inner ring will knockout first and then the
outer ring should be tapped in (1) or (2) locations with a
screwdriver before it can be peeled out. The cover will be
connected to the housing by the sensor leads.
3. Use two--conductor, 16--22 AWG twisted pair or shielded
cable to connect the sensor to the controller. All wiring
should be done in accordance with all Local and National
Electrical Code guidelines.
NOTE: When using a shielded cable, be sure to connect only (1)
end of the shield to ground at the controller. Connecting both ends
of the Shield to Ground may cause a Ground Loop.
4. Place the cover onto the unit and gently turn until it is tight.
Be careful not to apply too much pressure when tightening.
Wiring the Outdoor Air Relative Humidity Sensor
To wire the sensor, perform the following (See Fig. 15.):
1. Identify which cable is for the sensor wiring.
2. Strip back the jacket from the cable for at least 3 inches.
Strip 1/4--in. of insulation from each conductor. Cut the
shield and drain wire (if located) from the sensor end of the
cable.
12
J4-1 or J4-4 + 24 VDC Supply Voltage
J4-2 or J4-5 (-) 4 to 20 mA Current Loop Output
to RTU-MP
Relative Humidity Sensor
(Polarized Male Connector)
SPAN
ZERO
C07210
Fig. 15 -- Wiring Outdoor Air Relative Humidity Sensor
3. Connect the sensor cable as follows:
a. Connect one wire from the cable for the 24DC source to
J4--4 on Input 1 or J4--1 if Input 2 will be used.
Connect the other end of the wire to VAC terminal on
the sensor.
b. Connect the other wire from the cable for the 4--20mA
signal to J4--5 on Input 1 or J4--2 if Input 2 will be
used. Connect the other end of the wire to 4--20mA
terminal on the sensor.
4. In the Control box, install a no. 10 ring type crimp lug on
the shield drain wire. Install this lug under the mounting
screw of the RTU--MP controller.
Connect Discrete Inputs
Field installing a humidistat, smoke detector, filter and/or fan status
switch, remote occupancy switch, and enthalpy to the RTU--MP
controller is explained below. For other details, refer to Fig. 1 and
7 for wiring and the configuration section for configuration.
Humidistat
The humidistat input is only provided on J5--7 as input 9. (See
Fig.
1.)
The
Humidistat
Switch
configuration,
MENU→Config→Inputs→input 9, identifies it and the normally
open or normally closed status of this input at high humidity.
J5--8 = 24 VAC source for dry contact
J5--7 = Signal input
Fire Shutdown
The fire shutdown input is provided for unit shutdown in response
to a fire alarm or smoke detector. The Fire Shutdown Switch
configuration, MENU→Config→Inputs→input 5, identifies the
normally closed status of this input when there is no fire alarm.
For 48/50 units without factory installed smoke detectors, a jumper
is installed between TB4--5 and TB4--7. (See Fig. 7.)
When field installing smoke detectors:
TB4--5 = 24 VAC source for dry contact
TB4--6 = Signal input
NOTE: The jumper must then be reinstalled across TB4--6 and
TB4--7.
Filter Status
The filter status accessory is a field--installed accessory. This
accessory detects plugged filters. When installing this accessory,
the unit must be configured for filter status by setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Filter Status and
normally open (N/O) or normally closed (N/C). Input 8 or 9 is
recommended for easy of installation. Refer to Fig. 1 and 7 for
wire terminations at J5.
Fan Status
The fan status accessory is a field--installed accessory. This
accessory detects when the indoor fan is blowing air. When
installing this accessory, the unit must be configured for fan status
by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan
Status and normally open (N/O) or normally closed (N/C). Input 8
or 9 is recommended for easy of installation. Refer to Fig. 1 and 7
for wire terminations at J5.
Remote Occupancy
The remote occupancy accessory is a field--installed accessory.
This accessory overrides the unoccupied mode and puts the unit in
occupied mode. When installing this accessory, the unit must be
configured
for
remote
occupancy
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Remote
Occupancy and normally open (N/O) or normally closed (N/C).
Also set MENU→Schedules→occupancy source to DI on/off.
Input 8 or 9 is recommended for easy of installation. Refer to Fig.
1 and 7 for wire terminations at J5.
Enthalpy Switch/Receiver
The accessory enthalpy switch/receiver (33CSENTHSW) senses
temperature and humidity of the air surrounding the device and
calculates the enthalpy when used without an enthalpy sensor. The
relay is energized when enthalpy is high and de--energized when
enthalpy is low (based on ASHRAE 90.1 criteria). If an accessory
enthalpy sensor (33CSENTSEN) is attached to the return air sensor
input, then differential enthalpy is calculated. The relay is
energized when the enthalpy detected by the return air enthalpy
sensor is less than the enthalpy at the enthalpy switch/receiver. The
relay is de--energized when the enthalpy detected by the return air
enthalpy sensor is greater than the enthalpy at the enthalpy
switch/receiver (differential enthalpy control). (See Fig. 16 and 17.)
13
RTU-- MP
4-20 VAC GND 0-5V
mA or
or
VDC
0-10V
RTU-- MP
C07140
Fig. 16 -- Enthalpy Switch/Receiver Dimensions
(33CSENTHSW)
NOTE: The enthalpy calculation is done using an average altitude
of 1000 ft above sea level.
Mounting
Mount the enthalpy switch/receiver in a location where the outdoor
air can be sampled (such as the outdoor air intake). The enthalpy
switch/receiver is not a NEMA 4 (National Electrical
Manufacturers Association) enclosure and should be mounted in a
location that is not exposed to outdoor elements such as rain or
snow. Use two field-supplied no. 8 x 3/4-in. TEK screws. Insert the
screws through the holes in the sides of the enthalpy
switch/receiver.
Wiring
Carrier recommends the use of 18 to 22 AWG (American Wire
Gauge) twisted pair or shielded cable for all wiring. All
connections must be made with 1/4-in. female spade connectors.
A 24-vac source is required to power the enthalpy switch/receiver;
as shown in Fig. 18, the RTU--MP board provides 24 vac on one of
the two grey wires. Connect the GND and 24-vac terminals on the
enthalpy switch/receiver to the unit ground--brown wires on the
transformer. On some applications, the power from the economizer
harness can be used to power the enthalpy switch/receiver. To
power the enthalpy switch/receiver from the economizer harness,
connect power of the enthalpy switch/receiver to the red and brown
wires (1 and 4) on the economizer harness.
For connection to rooftop units with RTU--MP control, connect the
LOW Enthalpy terminal on the enthalpy switch/receiver to the grey
wire connected to J2--6.
To determine that the correct grey wire was used, measure the
voltage on the wire with power applied to the unit. If 24--vac is not
sensed, the correct wire is connected. The grey wire with 24--vac
measured with power on to the unit is used for a dry contact type
switch.
Differential Enthalpy Control (Fig. 18)
C07141
Fig. 17 -- Enthalpy Sensor Dimensions
(33CSENTSEN)
Outdoor Enthalpy Control
Outdoor enthalpy control requires only an enthalpy switch/receiver
(33CSENTHSW). The enthalpy switch/receiver is mounted in the
outdoor air inlet and calculates outdoor air enthalpy. The enthalpy
switch/receiver energizes the relay output when the outdoor
enthalpy is above 28 BTU/lb OR dry bulb temperature is above
75_F and is de--energized when the outdoor enthalpy is below 27
BTU/lb AND dry bulb temperature is below 74.5_F. The relay
output is wired to the unit economizer which will open or close
depending on the output of the switch.
Differential enthalpy control requires both an enthalpy
switch/receiver (33CSENTHSW) and an enthalpy sensor
(33CSENTSEN). The enthalpy switch/receiver is mounted in the
outdoor air inlet and calculates outdoor air enthalpy. The enthalpy
sensor is mounted in the return airstream and calculates the
enthalpy of the indoor air.
The enthalpy switch/receiver energizes the HI Enthalpy relay
output when the outdoor enthalpy is greater than the indoor
enthalpy. The LOW Enthalpy terminal is energized when the
outdoor enthalpy is lower than the indoor enthalpy. The relay
output is wired to the unit economizer which will open or close
depending on the output of the switch.
NOTE: The enthalpy calculation is done using an average altitude
of 1000 ft above sea level.
Mounting
Mount the enthalpy switch/receiver in a location where the outdoor
air can be sampled (such as the outdoor air intake). The enthalpy
switch/receiver is not a NEMA 4 enclosure and should be mounted
in a location that is not exposed to outdoor elements such as rain,
snow, or direct sunlight. Use two field-supplied no. 8 x 3/4-in. TEK
screws. Insert the screws through the holes in the sides of the
enthalpy switch/receiver.
Mount the enthalpy sensor in a location where the indoor air can be
sampled (such as the return air duct). The enthalpy sensor is not a
NEMA 4 enclosure and should be mounted in a location that is not
exposed to outdoor elements such as rain or snow. Use two
field-supplied no. 8 x 3/4-in. TEK screws. Insert the screws through
the holes in the sides of the enthalpy sensor.
Wiring
Carrier recommends the use of 18 to 22 AWG twisted pair or
shielded cable for all wiring. All connections must be made with
1/ -in. female spade connectors.
4
14
120 VAC
LINE VOLTAGE
24 VAC
SECONDARY
24 VAC OUTPUT FROM N/C CONTACT WHEN THE
OUTDOOR ENTHALPY IS LESS THAN THE
GRY
INDOOR ENTHALPY
(ENABLE ECONOMIZER)
4-20 24-36
mA VDC
IN OUT
HI LOW GND 24
ENTHALPY
VAC
24-36 4-20
VDC mA
IN OUT
33CSENTHSW
33CSENTSEN
JUMPER SETTINGS FOR 33CSENTHSW
JUMPER SETTINGS FOR 33CSENTSEN
0%
50%
OFF
100%
M1
M2
M3
0%
50%
OFF
100%
M1
M2
M3
LEGEND
N/C - Normally Closed
N/O - Normally Open
RTU-- MP
24 VAC OUTPUT FROM N/O CONTACT WHEN THE
INDOOR ENTHALPY IS GREATER THAN THE
OUTDOOR ENTHALPY
(ENABLE ENERGYSRECYCLER)
C07142
Fig. 18 -- Differential Enthalpy Control Wiring
The RTU--MP board provides 24-vac to power the enthalpy
switch/receiver. Connect the GND and 24-vac terminals on the
enthalpy switch/receiver to the terminals on the transformer. On
some applications, the power from the economizer harness can be
used to power the enthalpy switch/receiver. To power the enthalpy
switch/receiver from the economizer harness, connect power of the
enthalpy switch/receiver to the red and brown wires (1 and 4) on
the economizer harness.
Connect the LOW Enthalpy terminal on the enthalpy
switch/receiver to the grey wire connected to J2--6.
Connect the 4-20 mA In terminal on the enthalpy switch/
receiver to the 4-20 mA Out terminal on the return air enthalpy
sensor. Connect the 24-36 VDC Out terminal on the enthalpy
switch/receiver to the 24-36 VDC In terminal on the return air
enthalpy sensor. (See Fig. 18.)
Enthalpy Switch/Receiver Jumper Settings
There are two jumpers. One jumper determines the mode of the
enthalpy switch/receiver. The other jumper is not used. To access
the jumpers, remove the 4 screws holding the cover on the
enthalpy switch/receiver and then remove the cover. The factory
settings for the jumpers are M1 and OFF.
The mode jumper should be set to M2 for differential enthalpy
control. The factory test jumper should remain on OFF or the
enthalpy switch/receiver will not calculate enthalpy.
Enthalpy Sensor Jumper Settings
There are two jumpers. One jumper determines the mode of the
enthalpy sensor. The other jumper is not used. To access the
jumpers, remove the 4 screws holding the cover on the enthalpy
sensor and then remove the cover. The factory settings for the
jumpers are M3 and OFF.
The mode jumper should be set to M3 for 4 to 20 mA output. The
factory test jumper should remain on OFF or the enthalpy sensor
will not calculate enthalpy.
Communication Wiring--Protocols
General
Protocols are the communication languages spoken by control
devices. The main purpose of a protocol is to communicate
information in the most efficient method possible. Different
protocols exist to provide different kinds of information for
different applications. In the BAS application, many different
protocols are used, depending on manufacturer. Protocols do not
change the function of a controller; just make the front end user
different.
The RTU--MP can be set to communicate on four different
protocols: BACnet, Modbus, N2, and LonWorks. Switch 3 (SW3)
on the board is used to set protocol and baud rate. Switches 1 and
2 (SW1 and SW2) are used to set the board’s network address. See
Fig 19 for the switch setting per protocol. The 3rd party
connection to the RTU--MP is through plug J19. Refer to the
RTU--MP 3rd Party Integration Guide for more detailed
information on protocols, 3rd party wiring, and networking.
NOTE: Power must be cycled after changing the SW1--3 switch
settings.
BACnet MS/TP
BACnet Master Slave/Token Passing (MS/TP) is used for
communicating BACnet over a sub--network of BACnet--only
controllers. This is the default Carrier communications protocol.
Each RTU--MP module acts as an MS/TP Master. The speed of an
MS/TP network can range from 9600 to 76.8K baud. Physical
Addresses can be set from 01 to 99.
15
SW3 Protocol Selection
PROTOCOL
DS8
DS7
DS6
DS5
DS4
DS3
DS2
DS1
BACnet MS/TP
(Master)
Unused
OFF
OFF
OFF
ON
OFF
Select Baud
Select Baud
Modbus
(Slave)
Unused
OFF
OFF
ON
ON
OFF
Select Baud
Select Baud
N2
(Slave)
Unused
OFF
OFF
OFF
ON
ON
OFF
OFF
LonWorks
Unused
ON
ON
OFF
ON
OFF
OFF
OFF
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
DS2
DS1
9600
OFF
OFF
19,200
ON
OFF
38,400
OFF
ON
76,800
ON
ON
RTU-- MP
Baud Rate
C07166
Fig. 19 -- RTU--MP SW3 Dip Switch Settings
Modbus
Local Access
The RTU--MP module can speak the Modicon Modbus RTU
Protocol as described in the Modicon Modbus Protocol Reference
Guide, PI----MBUS----300 Rev. J. The speed of a Modbus network
can range from 9600 to 76.8K baud. Physical Addresses can be set
from 01 to 99.
BACview6 Handheld
The BACview6 is a keypad/display interface used to connect to the
RTU--MP to access the control information, read sensor values, and
test the RTU (See Fig. 20). This is an accessory interface that does
not come with the MP controller and can only be used at the unit.
You connect the BACview6 to the RTU--MP’s J12 local access
port. There are 2 password protected levels in the display (User
and Admin). The user password is defaulted to 0000 but can be
changed. The Admin password is 1111 and cannot be changed.
There is a 10 minute auto logout if a screen is left idle. See
Appendix A for navigation and screen content.
Virtual BACview
Virtual BACview is a freeware computer program that functions as
the BACview6 Handheld. The USB Link interface (USB--L) is
required to connect a computer to the RTU--MP board. The link
cable connects a USB port to the J12 local access port. This
program functions and operates identical to the handheld.
Johnson N2
N2 is not a standard protocol, but one that was created by Johnson
Controls, Inc. that has been made open and available to the public.
The speed of N2 network is limited to only 9600 baud. Physical
Addresses can be set from 01 to 99.
LonWorks
LonWorks is an open protocol that requires the use of Echelon’s
Neuron microprocessor to encode and decode the LonWorks
packets. In order to reduce the cost of adding that hardware on
every module, a separate LonWorks Option Card (LON--OC) was
designed to connect to the RTU--MP.
This accessory card is needed for LonWorks and has to be ordered
and connected using the ribbon cable to plug J15. The RTU--MP’s
baud rate must be set to 38.4k to communicate with the LON--OC.
The address switches (SW1 & SW2) are not used with LonWorks.
Fig. 20 -- BACview6 Handheld Connections
16
C07170
Refer to the base unit installation instructions for start--up
procedure and checklist. Field Service Test, explained below, will
assist in proper start--up. Configuratin of unit parameters,
scheduling options, and operation are also discussed in this section.
Field Service Test
The Field Service Test function can be used to verify proper
operation of compressors, heating stages, indoor fan, power
exhaust fans, economizer, and dehumidification. Use of Field
Service Test is recommended at initial system start up and during
troubleshooting. See Appendix A for Field Service Test Mode
table.
Field Service Test mode has the following changes from normal
operation:
S Outdoor air temperature limits for cooling circuits, economizer,
and heating are ignored.
S Normal compressor time guards and other staging delays are
ignored.
S The status of Alarms (except Fire and Safety chain) is ignored
but all alerts and alarms are still broadcasted on the network.
Field Service Test can be turned ON/OFF at the unit display or
from the network. Once turned ON, other entries may be made
with the display or through the network. To turn Field Service Test
on, change the value of Test Mode to ON, to turn Field Service
Test off, change the value of Test Mode to OFF.
NOTE: Service Test mode is password protected when accessing
from the display. Depending on the unit model, factory--installed
options, and field--installed accessories, some of the Field Service
Test functions may not apply.
The independent outputs (IndpOutputs) submenu is used to change
output status for the supply fan, economizer, and Power Exhaust.
These independent outputs can operate simultaneously with other
Field Service Test modes. All outputs return to normal operation
when Field Service Test is turned off.
The Cooling submenu is used to change output status for the
individual compressors and the dehumidification relay.
Compressor starts are not staggered. The fans and heating service
test outputs are reset to OFF for the cooling service test. Indoor
fans and outdoor fans are controlled normally to maintain proper
unit operation. All normal cooling alarms and alerts are functional.
NOTE: Circuit A is always operated with Circuit B due to
outdoor fan control on Circuit A. Always test Circuit A first, and
leave it on to test other Circuits.
For units with the factory Humidi--MiZert option, the
dehumidification relay is used to change the output status to
operate the circuits in different Humidi--MiZer modes. With only
the dehumidification relay on, all circuits will run in
dehumidification mode. With the dehumidification relay on and
the cooling test (compressor test relays) on, individual circuits will
run in cooling dehumidification mode. The fans and heating
service test outputs are reset to OFF for the Humdi--MiZer service
test. Indoor and outdoor fans are controlled normally to maintain
proper unit operation. All normal cooling/dehum alarms and alerts
are functional.
The Heating submenu is used to change output status for the
individual heat stages, gas or electric. The fans and cooling service
test outputs are reset to OFF for the heating service test. All normal
heating alarms and alerts are functional.
NOTE: Service Test Mode does not timeout. Be sure to turn off
test mode or cycle power to the RTU to return to normal operation.
Configuration
The RTU--MP controller configuration points affect the unit
operation and/or control. Review and understand the meaning and
purpose of each configuration point before changing it from the
factory default value. The submenus containing configuration
points are as follows: Unit, Cooling, Heating, Inputs, Economizer,
IAQ, Clock--Set, and User Password (USERPW).
Each
configuration point is described below under its according
submenu. See the Appendix for display tables.
Unit
Start Delay
This refers to the time delay the unit will wait after power up
before it pursues any specific operation.
Factory Default = 5 sec
Range = 0--600 sec
Filter Service Hours
This refers to the timer set for the Dirty Filter Alarm. After the
number of runtime hours set on this point is exceeded the
corresponding alarm will be generated, and must be manually
cleared on the alarm reset screen after the maintenance has been
completed. The timer will then begin counting its runtime again
for the next maintenance interval.
Factory Default = 600 hr
NOTE: Setting this configuration timer to 0, disables the alarm.
Supply Fan Service Hours
This refers to the timer set for the Supply Fan Runtime Alarm.
After the number of runtime hours set on this point is exceeded the
corresponding alarm will be generated, and must be manually
cleared on the alarm reset screen after the maintenance has been
completed. The timer will then begin counting its runtime again
for the next maintenance interval.
Factory Default = 0 hr
NOTE: Setting this configuration timer to 0, disables the alarm.
Compressor1 Service Hours
This refers to the timer set for the Compressor 1 Runtime Alarm.
After the number of runtime hours set on this point is exceeded the
corresponding alarm will be generated, and must be manually
cleared on the alarm reset screen after the maintenance has been
completed. The timer will then begin counting its runtime again
for the next maintenance interval.
Factory Default = 0 hr
NOTE: Setting this configuration timer to 0, disables the alarm.
Compressor2 Service Hours
This refers to the timer set for the Compressor 2 Runtime Alarm.
After the number of hours set on this point is exceeded the
corresponding alarm will be generated, and must be manually
cleared on the alarm rest screen after the maintenance has been
completed. The timer will then begin counting its runtime again
for the next maintenance interval.
Factory Default = 0 hr
NOTE: Setting this configuration timer to 0, disables the alarm.
Cooling
Number of Compressor Stages
This refers to the number of mechanical cooling stages available on
a specific unit. Set this point to “One Stage” if there is one
compressor in the specific unit, set to “Two Stage” if there are two
compressors in the unit, and set to “None” if economizer cooling
ONLY is desired.
Factory Default = One Stage for 1 compressor units
Two Stage for 2 compressor units
17
RTU-- MP
START-UP
RTU-- MP
Cooling/Econ SAT Low Setpt
The supply air temperature must remain above this value to allow
cooling with the economizer and/or compressors. There is 5_F
plus and minus deadband to this point. If the SAT falls below this
value during cooling, all compressors will be staged off. The
economizer will start to ramp down to minimum position when the
SAT = this configuration +5_F.
Factory Default = 50_F
Range = 45--75_F
Cooling Lockout Temp
This defines the minimum outdoor air temperature that cooling
mode can be enabled and run. If the OAT falls below this threshold
during cooling, then compressor cooling will not be allowed.
Factory Default = 45_F
Range = 0--65_F
Heating
Heat Pump RTU
This configuration is only for rooftop heat pumps. It does NOT
control a reversing valve directly. Its purpose is to add additional
delay between heating stages to properly control a rooftop heat
pump heating operation. See the Heating Sequence of Operation
for more details.
Factory Default = NO for non--heat pump units
YES for heat pump units
Heating SAT High Setpt
The supply air temperature must remain below this value to allow
heating. There is 5_F plus and minus deadband to this point. If
the SAT rises above this value during heating the heat stages will
begin to decrease until the SAT has dropped below this value.
Factory Default = 120_F
Range = 95--150_F
Heating Lockout Temp
This defines the maximum outdoor air temperature that heating
mode can be enabled and run. If the OAT rises above this threshold
during heating, then heating will not be allowed.
Factory Default = 65_F
Range = 49--95_F
Inputs
NOTE: For installation of inputs and field installed accessories,
refer to the appropriate sections.
Input 3
This input is a discrete input and can be configured to be one of
five different inputs: No Function, Compressor Safety, Fan Status,
Filter Status, or Remote Occupancy. This input can also be
configured to be either Normally Open (N/O) or Normally Closed
(N/C). Input 3 is factory wired to pin J1--2. Field accessories get
wired to its parallel pin J5--5. Do not connect inputs to both
locations, one function per input.
Factory Default = Compressor Safety and N/O
NOTE: Compressor Safety input comes from the CLO board.
J1--2 is always factory wired to TB1--8 (X) terminal on the unit. If
the unit has a CLO board, do not configure input 3 for anything
but Compressor Safety.
Input 5
This input is a discrete input and can be configured to be one of
five different inputs: No Function, Fire Shutdown, Fan Status,
Filter Status, or Remote Occupancy. This input can also be
configured to be either Normally Open (N/O) or Normally Closed
(N/C). Input 5 is factory wired to pin J1--10. Field accessories get
wired to its parallel pin J5--3. Do not connect inputs to both
locations, one function per input.
Factory Default = Fire Shutdown and N/C
NOTE: Fire Shutdown input comes from TB4--7. J1--10 is
always factory wired to TB4--7. Only change input 5s function if
absolutely needed.
Input 8
This input is a discrete input and can be configured to be one of
five different inputs: No Function, Enthalpy Switch, Fan Status,
Filter Status, or Remote Occupancy. This input can also be
configured to be either Normally Open (N/O) or Normally Closed
(N/C). Input 8 is factory wired to pin J2--6. Field accessories get
wired to its parallel pin J5--1. Do not connect inputs to both
locations, one function per input.
Factory Default = No Function and N/O
Input 9
This input is a discrete input and can be configured to be one of
five different inputs: No Function, Humidistat, Fan Status, Filter
Status, or Remote Occupancy. This input can also be configured to
be either Normally Open (N/O) or Normally Closed (N/C). Input 9
is factory and field wired to pin J5--7. Do not connect inputs to
both locations, one function per input.
Factory Default = Humidistat and N/O
Space Sensor Type
This tells the controller what type of space sensor is installed to run
the unit. The three types that can be used are the T55 space sensor,
the T56 space sensor, or the RS space sensor.
Factory Default = T55 Type
Input 1 Function
This input is an analog input and can be configured to be one of
five different inputs: No Sensor, IAQ Sensor, OAQ Sensor, Space
RH Sensor, or Outdoor RH Sensor. Input 1 is wired to pin J4--5.
Factory Default = No Sensor
Input 2 Function
This input is an analog input and can be configured to be one of
five different inputs: No Sensor, IAQ Sensor, OAQ Sensor, Space
RH Sensor, or Outdoor RH Sensor. Input 2 is wired to pin J4--2.
Factory Default = No Sensor
Setpoint Slider Range
This sets the slider range of the space sensor (with this built in
function). The slider is used to offset the current control setpoint.
Factory Default = 5 n_F
Range = 0--15 n_F
T55/56 Override Duration
This sets the occupancy override duration when the override button
is pushed on the space sensor.
Factory Default = 1 hr
Range = 0--24 hr
18
Economizer
Economizer Exists
This point tells the controller if there is an economizer installed on
the unit.
Factory Default = NO if no economizer
YES if there is an economizer installed
Economizer Minimum Position
This defines the lowest economizer position when the indoor fan is
running and the building is occupied.
Factory Default = 20%
Range = 0--100 %
Economizer High OAT Lockout
If the outdoor air temperature rises above this value, economizer
cooling will be disabled and dampers will return and stay at
minimum position.
Factory Default = 75_F
Range = 55--80_F
Power Exhaust Setpt
When the economizer damper position opens above this point the
power exhaust operation will begin. When the damper position
falls 10% below the setpoint, the power exhaust will shutdown.
Factory Default = 50%
Range = 20--90 %
NOTE: This point is only used when Continuous Occ Exhaust =
NO
Continuous Occ Exhaust
This point tells the controller when to run the power exhaust if
equipped on the unit. If set to YES, the power exhaust will be on
all the time when in occupied mode and will be off when in
unoccupied mode. If set to NO the power exhaust will be
controlled by the Power Exhaust Setpoint.
Factory Default = NO
IAQ
Max Differential CO2 Setpt
If the difference between indoor an outdoor air quality becomes
greater then this value the damper position will stay at the IAQ
Greatest Min Dmpr Pos. configuration point.
Factory Default = 650 PPM
Range = 300--950 PPM
IAQ Greatest Min Dmpr Pos.
This is the greatest minimum position the economizer will open to
while trying to control the indoor air quality, CO2 differential.
Factory Default = 50% open
Range = 10--60% open
Clockset
This submenu screen allows you to set the date and time manually.
The Daylight Savings Time (DST) can also be changed here. The
date and time is automatically set whenever software is
downloaded. The clock is a 24 hour clock and not am/pm. The
time should be verified (and maybe changed) according to unit
location and time zone.
Factory Default = Eastern Standard Time
USERPW
This submenu screen allows you to change the user password to a
four number password of choice. The User password change
screen is only accessible with the Administrator Password (1111).
The ADMIN password will always override the user password.
Factory Default = 0000
Range = 0000--9999
Sequence of Operation
The RTU--MP will control the compressor, economizer and heating
outputs based on its own space temperature input and setpoints.
An optional CO2 IAQ sensor mounted in the space can influence
the economizer minimum position. The RTU--MP has its own
hardware clock that is set automatically when the software is
installed on the board. The RTU--MP’s default is to control to
occupied setpoints all the time, until a type of occupancy control is
set. Occupancy types are described in the scheduling section. The
following sections describe the operation for the functions of the
RTU--MP. All point objects that are referred to in this sequence
will be in reference to the objects as viewed in BACview6
Handheld.
Scheduling
Scheduling is used to start heating or cooling (become occupied)
based upon a day of week and a time period and control to the
occupied heating or cooling setpoints. Scheduling functions are
located under occupancy determination and the schedule menu
accessed by the Menu softkey (see Appendix -- for menu structure).
Your local time and date should be set for these functions to
operate properly. Five scheduling functions are available by
changing the Occupancy Source to one of the following selections:
Always Occupied (Default Occupancy)
The unit will run continuously. RTU--MP ships from the factory
with this setting.
Local Schedule
The unit will operate according to the schedule configured and
stored in the unit. The local schedule is made up of three hierarchy
levels that consist of two Override schedules, twelve Holiday and
four Daily schedules, and are only accessible by the BACview
screen (handheld or virtual).
19
RTU-- MP
IAQ Low Reference @ 4mA
This is used when an IAQ sensor is installed on Input 1 or 2. This
value is displayed and used when 4mA is seen at the input.
Factory Default = 0 PPM
Range = 0--400 PPM
IAQ High Reference @ 20mA
This is used when an IAQ sensor is installed on Input 1 or 2. This
value is displayed and used when 20mA is seen at the input.
Factory Default = 2000 PPM
Range = 0--5000 PPM
NOTE: IAQ low Reference @ 4mA and IAQ High Reference @
20mA are used to set the linear curve of mA vs. PPM.
OAQ Low Reference @ 4mA
This is used when an OAQ sensor is installed on Input 1 or 2. This
value is displayed and used when 4mA is seen at the input.
Factory Default = 0 PPM
Range = 0--400 PPM
OAQ High Reference @ 20mA
This is used when an OAQ sensor is installed on Input 1 or 2. This
value is displayed and used when 20mA is seen at the input.
Factory Default = 2000 PPM
Range = 0--5000 PPM
NOTE: OAQ low Reference @ 4mA and OAQ High Reference
@ 20mA are used to set the linear curve of mA vs. PPM.
RTU-- MP
The Daily schedule is the lowest schedule in the hierarchy and is
overridden by both the Holiday and Override schedule. It consists
of a start time, a stop time (both in 24 hour mode) and the seven
days of the week, starting with Monday and ending in Sunday. To
select a daily schedule scroll to the Schedules menu off of the
Menu selection. Enter the User password and change the
Occupancy Source to Local Schedule. Scroll down and over to the
Daily menu and press enter. Choose one of the four Daily
schedules by pressing the Next softkey and change the Use? point
from NO to YES by selecting the point and pressing the INCR or
DECR softkey. Press the OK softkey and scroll to the start and
stop times. Edit these times following the same steps as the Use?
point. Finally scroll down to the Days: section and highlight the
days required for the Daily schedule by INCR or DECR softkeys
and press OK softkey.
The Holiday schedule is created to override the Daily schedule and
identify a specific day and month of the year to start and stop the
unit and change control to the unoccupied heating and cooling
setpoints. Follow the same steps to turn on one of the twelve
Holiday schedules and start and stop times. Next, select one out of
the twelve months and one out of the thirty--one days of that
month. The RTU--MP will now ignore the Daily schedule for the
specific day and time you selected and follow the Holiday
Schedule for this period.
The Override schedules primary purpose is to provide a temporary
change in the occupied heating and cooling setpoints and force the
unit to control to the unoccupied heating and cooling setpoints.
This would occur on a set day in a particular month and last during
the start and stop time configured. The Override schedule is
enabled by following the same steps to create the Holiday
schedule.
NOTE: Push button override is only available when running a
local or BACnet Schedule.
BACnet Schedule
For use with a Building Automation System that supports native
BACnet scheduling is scheduling the unit. With the Occupancy
Source set to BACnet schedule the BAS will control the unit
through network communication and it’s own scheduling function.
BAS On/Off
The Building Automation System is scheduling the unit via an
On/Off command to the BAS ON/OFF software point. The
Building Automation System can be speaking BACnet, Modbus,
or N2 and is writing to the BAS On/Off point in the open protocol
point map.
NOTE: If the BAS supports NATIVE BACnet scheduling, then
set the Occupancy Source to BACnet schedule. If the BAS is
BACnet but does NOT support NATIVE BACnet scheduling, then
set the Occupancy Source to BAS On/Off.
DI On/Off
A hard--wired input on the RTU--MP will command the unit to
start/stop. Inputs 3, 5, 8, and 9 on plug J5 can be hard--wired to
command the unit to start/stop.
NOTE: Scheduling can either be controlled via the unit or the
BAS, but NOT both.
Indoor Fan
The indoor fan will be turned on whenever any one of the
following conditions is true:
S It is in the occupied mode. This will be determined by its own
internal occupancy schedule.
S Whenever there is a demand for cooling or heating in the
unoccupied mode.
S Whenever the remote occupancy switch is closed during DI
On/Off schedule type or if occupancy is forced occupied by the
BAS during BAS On/Off schedule type.
When transitioning from unoccupied to occupied, there will be a
configured time delay of 5 to 600 seconds before starting the fan.
The fan will continue to run as long as compressors, heating stages,
or the dehumidification relays are on when transitioning from
occupied to unoccupied with the exception of Shutdown mode. If
Fire Shutdown, safety chain, SAT alarm or SPT alarm are active;
the fan will be shutdown immediately regardless of the occupancy
state or demand.
The RTU--MP has an optional Supply Fan Status input to provide
proof of airflow. If this is enabled, the point will look for a contact
closure whenever the Supply Fan Relay is on. If it is not enabled
then it will always be the same state as the Supply Fan Relay. The
cooling, economizer, heating, dehumidification, CO2 and power
exhaust routines will use this input point for fan status.
Cooling
The compressor outputs are controlled by the Cooling Control PID
Loop and Cooling Stages Capacity algorithm. They will be used to
calculate the desired number of stages needed to satisfy the space
by comparing the Space Temperature (SPT) to the Occupied Cool
Setpoint plus the T56 slider offset when occupied and the
Unoccupied Cool Setpoint (UCSP) plus the T56 slider offset, if
unoccupied. The economizer, if available, will be used for cooling
in addition to the compressors. The following conditions must be
true in order for this algorithm to run:
S Indoor Fan has been ON for at least 30 seconds.
S Heat mode is not active and the time guard between modes
equals zero.
S If occupied and the SPT >(occupied cool setpoint plus the T56
slider offset).
S Space Temperature reading is available.
S If it is unoccupied and the SPT > (unoccupied cool setpoint plus
the T56 slider offset). The indoor fan will be turned on by the
staging algorithm.
S If economizer is available and active and economizer open >
85% and SAT > (SAT low limit + 5_F) and SPT > effective set
point + 0.5_F.
OR
Economizer is available, but not active
OR
Economizer is not available
S OAT > DX Lockout temperature.
If all of the above conditions are met, the compressors will be
energized as required, otherwise they will be de--energized.
There is a fixed 3--minute minimum on time and a 5--minute off
time for each compressor output and a 3--minute minimum time
delay between staging up or down.
Any time the compressors are running the RTU--MP will stage
down the compressors if the SAT becomes less than the cooling
low supply air setpoint.
After a compressor is staged off, it may be started again after a
normal time--guard period and the supply air temperature has
increased above the low supply air setpoint.
Economizer
The Economizer dampers are used to provide free cooling and
Indoor Air Quality, if optional CO2 sensor is installed, when the
outside conditions are suitable.
20
If any of the mentioned conditions are not true, the economizer will
be set to its configured minimum position. The minimum damper
position can be overridden by the IAQ routine described later in
this section.
If the above conditions are true, the Economizer Control Master
Loop will calculate a damper position value based on the following
calculation:
Damper Position = minimum position + PID (SPT -- econ
setpoint). Econ setpoint is half way between the effective cool and
heat setpoints. If the SAT drops below the cooling low supply air
setpoint (+ 5_F), the economizer will ramp down to minimum
position.
Power Exhaust
If RTU--MP is also controlling an exhaust fan, it can be enabled
based on damper position or by occupancy. If configured for
continuous occupied operation, it will be energized whenever the
controller is in the occupied mode and disabled when in the
unoccupied mode. If configured for damper position control, it
will be energized whenever the economizer exceeds the power
exhaust setpoint and disabled when the economizer drops below
the setpoint by a fixed hysteresis of 10%.
Heating
The compressor outputs are controlled by the Heating Control PID
Loop and Heating Stages Capacity algorithm. They will be used to
calculate the desired number of stages needed to satisfy the space
by comparing the SPT to the Occupied Heat Setpoint the T56
slider offset when occupied and the Unoccupied Heat Setpoint plus
the T56 slider offset if unoccupied. The following conditions must
be true in order for this algorithm to run:
S Indoor Fan has been ON for at least 30 seconds.
S Cool mode is not active and the time guard between modes
equals zero.
S If occupied and SPT <(occupied heat setpoint plus T56 slider
offset)
S SPT reading is available
S If it is unoccupied and the SPT < (unoccupied heat setpoint plus
T56 slider offset). The indoor fan will be turned on by the
staging algorithm.
S OAT < High OAT lockout temperature.
If all of the above conditions are met, the heating outputs will be
energized as required, otherwise they will be de--energized. If the
SAT begins to exceed the high supply air setpoint, a ramping
function will cause the Heat Stages Capacity algorithm to decrease
the number of stages until the SAT has dropped below the setpoint.
There is a fixed one minute minimum on time and a one minute off
time for each heat output. Heat staging has a 2 minute stage up and
30 second stage down delay.
Heat pump operation (if the Heat Pump RTU configuration is set to
YES) is the same as above except for what is explained below.
There is a fixed 3 minute on and 5 minute off time for the first heat
stage output, and a one minute on and one minute off time for the
second heat stage output. There is a 10 minute minimum stage up
delay if the heat demand is <= 3_F, and a 2 minute minimum stage
up delay if heat demand is > 3_F. The stage down delay is still 30
seconds. If the Compressor Safety Alarm is active, the second heat
stage will come on with the first stage with no delay.
Indoor Air Quality
If the optional indoor air quality sensor is installed, the RTU--MP
will maintain indoor air quality within the space at the user
configured differential set point. The set point is the difference
between the indoor air quality and an optional outdoor air quality
sensor. If the outdoor air quality is not present then a fixed value
of 400ppm is used. The following conditions must be true in order
for this algorithm to run:
S The mode is occupied.
S Indoor Fan has been ON for at least 30 seconds.
S Indoor Air Quality sensor has a valid reading
As air quality within the space changes, the minimum position of
the economizer damper will be changed thus allowing more or less
outdoor air into the space depending on the relationship of the
indoor air quality to the differential setpoint. If all the above
conditions are true, the IAQ algorithm will run and calculates an
IAQ minimum position value using a PID loop. The IAQ
minimum damper position is then compared against the user
configured economizer minimum position and the greatest value
becomes the final minimum damper position of the economizer
output.
If the calculated IAQ minimum position is greater than the IAQ
maximum damper position configuration then it will be clamped to
the configured value.
Dehumidification
The RTU--MP will provide occupied and unoccupied
dehumidification only on units that are equipped with the
Humidi--MiZert option from the factory. This function requires a
space relative humidity sensor or a humidistat for control. The
space relative humidity senor can be installed and configured as
one of the two analog input channels (inputs 1 or 2 on J4), or a
humidistat can be installed and configured as switch input 9 on J5.
When using a relative humidity sensor to control dehumidification,
occupied or unoccupied dehumidification setpoints are use
accordingly. When using a humidistat, setpoints are not used and
the dehumidification call comes when the humidistat indicates high
humidity.
When the indoor relative humidity becomes greater then the
dehumidification setpoint (or switches from low to high), a
dehumidification demand will acknowledged. Compressor state is
monitored and time guards are honored. If a compressor was just
turned off prior to the dehum call the dehumidification output will
be delayed the 5 minute minimum off time of the compressor.
When ok to dehumidify, the dehumidification output (J11--7, 8)
will be energized. This will bring on the supply fan, all
compressors, and the dehumidification relay placing the unit in
reheat dehumidification mode. If dehumidification is called for
during cooling or cooling is called for during dehumidification, the
unit will run in cooling dehumidification mode. Individual unit
circuits can be in different dehumidification modes based on the
demand.
Refer to the base units operation for additional
information.
NOTE: There is a fixed 5% hysteresis that the indoor relative
humidity must drop below the active setpoint to end the
dehumidification mode and de--energize the dehumidification
output. The output will also de--energize if the fan relay is
de--energized.
21
RTU-- MP
The following conditions must be true for economizer operation:
S Indoor Fan has been on for at least 30 seconds.
S Enthalpy is Low if the Enthalpy input is enabled.
S SAT reading is available.
S OAT reading is available.
S SPT reading is available.
S OAT <= High OAT economizer lockout configuration (default =
75).
S OAT <= SPT
Demand Limit
The MP controller can be used to troubleshoot the rooftop unit
and/or itself with service test, communicating LED’s, and built in
alarms; which is discussed in this literature. Disconnecting the
RTU--MP from the 3rd party network may also help
troubleshooting the controller and rooftop unit. Third Party
Network troubleshooting may also be required.
There is an on--board battery that is used for RAM and clock
back--up. It is a 3--volt lithium battery (CR2032). The average life
is 7 years with a minimum of 10,000 hours of back--up. When the
RTU--MP board is powered up, the battery is not being used. If
power is lost, the battery backs up the application code, settings
and configurations, and time clock. Battery replacement should be
done with the board powered up.
If the RTU--MP receives a level 1 (one degree offset), 2 (two
degree offset), or a 3 (4 degree offset) to the BACnet demand limit
variable, the controller will expand the heating and cooling
setpoints by the configured demand limit setpoint value and remain
in effect until the BACnet demand limit variable receives a 0 value.
TROUBLESHOOTING
General
RTU-- MP
The RTU--MP controller acts as an intelligent imbedded thermostat
to the rooftop unit, but can be monitored and controlled from a 3rd
party network. This causes the system as a whole to be troubleshot
from three points of view. The three parts to the system are the
rooftop unit, the MP controller, and the 3rd party network
connected. Determining which part needs to be troubleshot is the
first step.
Communication LED’s
The LED’s indicate if the controller is speaking to the devices on
the network. The LED’s should reflect communication traffic
based on the baud rate set. The higher the baud rate the more solid
the LED’s will appear.
Table 3 – LED’s
The LED’s on the RTU--MP show the status of certain functions
If this LED is on...
Status is...
Power
The RTU MP has power
Rx
The RTU MP is receiving data from the network segment
Tx
The RTU MP is transmitting data over the network segment
DO#
The digital output is active
The Run and Error LED’s indicate control module and network status
If Run LED shows...
And Error LED shows...
Status is...
2 flashes per second
Off
Normal
2 flashes per second
2 flashes, alternating with Run LED
Five minute auto ---restart delay after system error
2 flashes per second
3 flashes, then off
Control module has just been formatted
2 flashes per second
4 flashes, then pause
Two or more devices on this network have the same
ARC156 network address
2 flashes per second
On
Exec halted after frequent system errors or control programs halted
5 flashes per second
On
Exec start---up aborted, Boot is running
5 flashes per second
Off
Firmware transfer in progress, Boot is running
7 flashes per second
7 flashes per second, alternating with Run LED
Ten second recovery period after brownout
14 flashes per second
14 flashes per second, alternating with Run LED
Brownout
On
On
Failure. Try the following solutions:
S
S
S
S
22
Turn the RTU ---MP off, then on.
Format the RTU ---MP.
Download memory to the RTU ---MP.
Replace the RTU ---MP.
Table 4 – Troubleshooting Alarms
BACnet
OBJECT
NAME
ACTION TAKEN BY
CONTROL
Alarm Generated
Immediate Shutdown
Alarm Generated
Immediate Shutdown
Alarm Generated
Immediate Shutdown
Alarm Generated
Immediate Shutdown
RESET
METHOD
Safety Chain Alarm
safety_chain
Fire Shutdown Alarm
fire_alarm
Space Temp Sensor Failure
spt_alarm
SAT Sensor Alarm
sat_alarm
High Space Temp Alarm
spt_hi
Alarm Generated
Automatic
Low Space Temp Alarm
spt_lo
Alarm Generated
Automatic
High Supply Air Temp
sat_hi
Alarm Generated
Automatic
Low Supply Air Temp
sat_lo
Alarm Generated
Automatic
Supply Fan Failed to Start
sf_fail
Supply Fan in Hand
sf_hand
Compressor Safety Alarm
dx_compstat
Setpoint Slider Alarm
slide_alarm
Alarm Generated
Immediately disable
Operation
Alarm Generated
Ramp down
Operations
Alarm Generated
Alarm Generated
Offset set to zero
Alarm Generated
Automatic
Automatic
Automatic
Automatic
Over load Indoor Fan or Electric Heater overheat.
Smoke detected by smoke detector or configuration
incorrect
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
The space temperature has risen above the cool
setpoint by more than the desired amount.
The space temperature has dropped below the heat
setpoint by more than the desired amount.
SAT is greater then 160 degrees for more than 5
minutes.
The supply air temperature is below 35_F for more than
5 minutes.
Automatic
Tripped Circuit Breaker, Broken belt, Bad indoor fan
motor, Configuration incorrect, Bad fan status switch.
Automatic
Bad Fan Status Switch, Configuration incorrect.
Automatic
Compressor would not start.
STO sensor is open or shorted for more then 5
seconds.
Automatic
Automatic/reset timer when
configured
with or without
switch
Dirty Filter, supply fan run time exceeded, filter switch
configuration wrong.
Configure
correctly
More than one binary input is configured for the same
purpose. More then one discrete input is configured to
provide the same function.
Configure
correctly
More then one analog input is configured to provide the
same function.
Automatic
Faulty, shorted, or open thermistor caused by wiring
error or loose connection.
Sensor reading is out of range. Bad sensor, bad wiring,
or sensor configured incorrectly.
Dirty Filter Alarm
filter
Switch Configuration Alarm
sw_cfg_alarm
Misconfigured Analog Input
an_cfg_alarm
OAT Sensor Alarm
oat_alarm
Space RH Sensor Alarm
sprh_alarm
Alarm Generated
Dehumidification
disabled
Automatic
Outdoor RH Sensor Alarm
oarh_alarm
Alarm Generated
Automatic
High Space Humidity
Low Space Humidity
sprh_hi
sprh_lo
Automatic
Automatic
IAQ Sensor Alarm
iaq_alarm
Alarm Generated
Alarm Generated
Alarm Generated
Disables IAQ Operation
Economizer moves to
minimum position
OAQ Sensor Alarm
oaq_alarm
High Carbon Dioxide Level
Supply Fan Runtime Alarm
Compressor 1 Runtime
Alarm
Compressor 2 Runtime
Alarm
co2_hi
sf_rntm
Alarm Generated
Set OAQ to 400
Alarm Generated
Alarm Generated
dx1_rntm
dx2_rntm
Alarm Generated
Disable misconfigured
switch functions
Alarm Generated
Disable 4 selectable
analog inputs
Alarm Generated
Economizer and Low
ambient DX cooling
lockout disabled.
PROBABLE CAUSE
Automatic
Sensor reading is out of range. Bad sensor, bad wiring,
or sensor configured incorrectly.
IRH is greater then 70% for more then 10 minutes.
IRH is less then 35% for more then 10 minutes.
Sensor reading is out of range. Bad sensor, bad wiring,
or sensor configured incorrectly.
Automatic
clear the timer
Sensor reading is out of range. Bad sensor, bad wiring,
or sensor configured incorrectly.
CO2 reading is above 1200ppm.
Supply fan run time exceeded user defined limit.
Alarm Generated
clear the timer
Compressor run time limit is exceeded.
Alarm Generated
clear the timer
Compressor run time limit is exceeded.
Automatic
23
RTU-- MP
POINT NAME
RTU-- MP
Alarms
SAT Sensor Alarm
Alarms can be checked through the network and/or the local
access. All the alarms are listed in Table 4 with name, object name,
action taken by control, reset method, and probable cause. There
are help screens for each alarm on the local access display and
listed in Appendix A: Help Screens. Some alarms are explained in
detail below.
This alarm occurs immediately when the supply air temperature
sensor wired to the RTU--MP is disconnected or shorted. When
this occurs the Unit Status will be Shutdown and the System Mode
will be Run. Sensor, sensor connections, wiring, board connection,
and configurations should be checked for faults or errors. Alarm
will reset automatically when cause is fixed.
Safety Chain Alarm
Switch Configuration Alarm
This alarm occurs immediately if the supply--fan internal overload
trips or if an electric--heat limit switch trips. The Unit Status will
be Shutdown and the System Mode will be Disable. When this
happens TB--1 (R terminal) will not have 24 VAC, but the
RTU--MP board will still be powered. (See Fig. 21.) All unit
operations stop immediately and will not restart until the alarm
automatically clears. There are no configurations for this alarm; it
is all based on internal wiring. This alarm will never occur if Fire
Shutdown Alarm is active.
This occurs if more than one binary input (inputs 3, 5, 8, and 9) is
configured for the same function. When this happens the two
inputs (or more) configured wrong will be disabled as an inputs.
This alarm will automatically be cleared when configuration is
corrected.
An example of this would be: Input 3 = Compressor Safety, input
5 = Fan Status, input 8 = Fan Status, and input 9 = Humidistat; the
alarm would be active, unit would run, compressor safety and
humidistat would function normally, and Fan Status (inputs 5 & 8)
will be interpreted as “No Function.”
Fire Shutdown Alarm
This alarm occurs immediately when the smoke detector senses
smoke. The Unit Status will be Shutdown and the System Mode
will be Disable. When this happens TB4--7 will not have 24 VAC,
but the RTU--MP board will still be powered. (See Fig. 21.) All
unit operations stop immediately and will not restart until the alarm
automatically clears. If there is not a smoke detector installed or
the smoke detector did not trip, check input configurations.
NOTE: The default function for input 5 is normally closed Fire
Shutdown, if no detector is installed the jumper must be in place.
Space Temp Sensor Failure
This alarm occurs if the space sensor wired to the RTU--MP is
disconnected or shorted for more then 10 seconds. When this
occurs the Unit Status will be Shutdown and the System Mode will
be Run. Sensor, sensor connections, wiring, board connection, and
configurations should be checked for faults or errors. Alarm will
reset automatically when cause is fixed.
Misconfigured Analog Input
This occurs if more than one analog input (inputs 1 & 2) is
configured for the same sensor. When this happens the two inputs
will be disabled as inputs. This alarm will automatically be cleared
when configuration is corrected.
An example of this would be: Input 1 = IAQ Sensor, input 2 =
IAQ Sensor; the alarm would be active, unit would run, but the
IAQ Sensor (inputs 1 & 2) will be interpreted as “No Function.”
Third Party Networking
Third party communication and networking troubleshooting
should be done by or with assistance from the front end 3rd party
technician. A Module Status Report (Modstat) can be run from the
BACview6 or Virtual BACview (see Table 5 to perform). This lists
information about the board status and networking state. For basic
troubleshooting, see Table 6. Refer to the RTU--MP 3rd Party
Integration Guide for additional information.
C07468
Fig. 21 -- TB4 Troubleshooting and Wiring
24
Table 5 – Manufacture Date
When troubleshooting, you may need to know a control module’s manufacture date
Obtain the manufacture
date from a...
Notes
Module status report (modstat)
To obtain a modstat with BACview6:
1. Press Function (FN) key and hold.
2. Then press period (.)
3. Release both buttons.
4. Scroll down to find “Base Board hardware.” Underneath it will be the manufacture date.
The serial numbers are unique and contain embedded information:
“RMP” --These first three digits are unique to RTU ---MP and are used as an identifier.
“YM”
--These two digits identify the last digit of the year and month (in hex, A=10/Oct) of
manufacture. ”74” would represent a date of manufacture of ”April 2007”.
“ xxxx” --These four digits represent the sequential number of units produced for a given
product for the mentioned manufacturing time period.
“N”
--This final digit represents the decade and toggles between ”N” and ”M” every ten years.
Table 6 – Basic Protocol Troubleshooting
Problem
No communication with 3rd
party vendor
Possible cause
Incorrect settings on SW1, SW2 and SW3
RS485 Port has no voltage output
(check with RTU--- MP disconnected from RS485 communication bus)
Bacnet @ 9600/19.2K --- .01 to .045vdc
Bacnet @ 38.4K --- .06 to .09vdc
Bacnet @ 76.8K --- .1vdc
Modbus @ 9600 --- 76.8K --- .124vdc
N2 @ 9600 --- .124vdc
Verify devices are daisy chained and repeaters and bias
terminators are correctly installed
25
Corrective action
Verify and correct switch settings. Cycle
power to RTU--- MP after changing switch
settings.
Verify RTU--- MP has correct power supply
Possible bad driver on board.
Check RS485 bus for external before
reconnecting to the bus
Voltage, shorts or grounding
Before reconnecting to the bus
Check 3rd party vendor RS485 communication wiring guidelines and troubleshooting procedures
RTU-- MP
Sticker on the back of the main control
module board
”Serial No: RMPYMxxxxN”
(Bar Coded & Typed Number)
APPENDIX A — LOCAL ACCESS DISPLAY TABLES
Screen Navigation
STANDBY (FN + 4)
HOME (FN + 5)
Menu (FN + 1)
RTU-- MP
Login
Run Status
(FN + 2)
Occupancy
(FN + 6)
I/O Points
(FN + 7)
Set Points
(FN + 8)
Test Mode
(FN + 9)
Alarms
Schedules
Config
(FN + 3)
Network
IndpOutputs
Alarm Status
(FN + 0)
Daily
Unit
BACnet
Cooling
Alarm
Holiday
Cooling
Heating
Resets
Override
Heating
Setpoints
Inputs
Outputs
Run Hours
Inputs
Economizer
IAQ
CLOCKSET
DST
USERPW
Modstat screen only reached by (FN + .)
Main Screens
Screen
Point Name
BACnet Object
Values
STANDBY
Unit Status
occ_status
HOME
Occupancy Status
Date & Time
ver
Unit Status
Occupancy Status
Date & Time
ver
Admin or User
Password
occ_status
00.00
OFF
Fan Only
Free Cooling
Cooling
Heating
Dehumidification
Service Test
Shutdown
Unoccupied / Occupied
version
00.00
****
user: 0000 Admin:1111
Login
unit_stat_1
version
unit_stat_1
26
OFF
Fan Only
Free Cooling
Cooling
Heating
Dehumidification
Service Test
Shutdown
Unoccupied / Occupied
APPENDIX A — LOCAL ACCESS DISPLAY TABLES (CONT)
Menu - Run Status
Point Name
Unit Run Status
System Mode
Occupancy
I/O Points
Set Points
Run Hours
Cooling Stages Active
Heating Stages Active
RTU ---MP Software Version
Occupancy Source:
Occupancy Status
Local Schedule Status
BACnet Schedule Status
Sensor Override Time
BAS ON/OFF Status:
DI ON/Off Status:
Analog Inputs
Space Temperature Sensor
Supply Air Temperature
Local Outside Air Temp Sensor
Outdoor Air Relative Humidity
Outdoor Air Quality
Space Relative Humidity
Indoor Air Quality
Binary Inputs
Safety Chain Feedback
Compressor Safety Status
Fire Shutdown
Enthalpy Switch
Humidistat Input Status
Filter Status
Supply Fan Status
Remote Occupancy Input
Network Inputs
Outside Air Temp (BACnet)
Enthalpy (BACnet)
Binary Outputs
Supply Fan Relay State
Compressor 1 Relay State
Compressor 2 Relay State
Heat 1 Relay State
Heat 2 Relay State
Dehumidification Relay State
Power Exhaust Relay State
Analog Output
Economizer Commanded Pos.
Effective Cool Setpoint
Effective Heat Setpoint
Slider Setpoint Adjustment
Setpoint Slider Range
Occupied Cooling Setpoint
Occupied Heating Setpoint
Occupied Dehum Setpoint
Unoccupied Cooling Setpoint
Unoccupied Heating Setpoint
Unoccupied Dehum Setpoint
Max Differential CO2 Setpt
Power Exhaust Setpt
Supply Fan Runtime
Compressor 1 Runtime
Compressor 2 Runtime
Filter Runtime
BACnet Object
unit_stat
Range
OFF
Fan Only
Free Cooling
Cooling
Heating
Dehumidification
Service Test
Shutdown
sysmode
Disable
Test
RUN
occ_status
Unoccupied / Occupied
coolstgs
0 ---2
heatstgs
0 ---2
version
xx.xx
Occupancy Determination
occ_source
Always Occupied
Local Schedule
BACnet Schedule
BAS On/Off
DI On/Off
occ_status
Unoccupied / Occupied
kp_sched_stat
Unoccupied / Occupied
bacnet_schedule
Unoccupied / Occupied
overtime
0 ---1440
bas_on_off
Unoccupied / Occupied
remocc
Unoccupied / Occupied
I/O Points
Units
RTU-- MP
Screen
Run Status
min
sptsens
sat
oatsens
oarh
oaq
sprh
iaq
xxx.x
xxx.x
xxx.x
xxx
xxx
xxx
xxx
safety
compstat
firedown
enthalpy
humstat
filtstat
fanstat
remocc
Off / Run Enabled
Normal / Trouble
Run Enabled / Shutdown
High / Low
Low / High
Clean / Dirty
Off / Running
Off / On
oat
enthalpy_net
xxx.x
High / Low
sf
comp_1
comp_2
heat_1
heat_2
humizer
aux_2
Off / On
Off / On
Off / On
Off / On
Off / On
Off / On
Off / On
econocmd
xxx
%open
xxx
xx
xx
xx
xx
xx
xx
xxx
xx
xx
xxx
xxx
dF
dF
dF
^dF
dF
dF
%RH
dF
dF
%RH
PPM
%
xxxxxx
xxxxxx
xxxxxx
xxxxxx
hr
hr
hr
hr
Unit Setpoints
effective_cool_sp
effective_heat_sp
sp_adj
spo_range
occ_cool_sp
occ_heat_sp
occ_dehum_setpt
unocc_cool_sp
unocc_heat_sp
unocc_dehum_setpt
co2_stpt
pesetpt
Run Hours
sf_runtime
c1_runtime
c2_runtime
flts_runtime
27
dF
dF
dF
%RH
PPM
%RH
PPM
dF
APPENDIX A — LOCAL ACCESS DISPLAY TABLES (CONT)
Menu - Set Points
Screen
Contents
BACnet Object
Setpoints
User/BAS Setpoints
Occupied Cooling Setpoint
Occupied Heating Setpoint
Setpoint Slider Range
Occupied Dehum Setpoint
Unoccupied Cooling Setpoint
Unoccupied Heating Setpoint
Unoccupied Dehum Setpoint
Max Differential CO2 Setpt
Power Exhaust Setpt
occ_cool_sp
occ_heat_sp
spo_range
occ_dehum_setpt
unocc_cool_sp
unocc_heat_sp
unocc_dehum_setpt
co2_stpt
pesetpt
Default
Value
Units
74
68
5
60
85
60
95
650
50
dF
dF
^dF
%RH
dF
dF
%RH
PPM
%
Range
Editable
55--- 80
55--- 80
0--- 15
30--- 90
75--- 130
40--- 80
0--- 100
300--- 950
10--- 100
Y
Y
Y
Y
Y
Y
Y
Y
Y
RTU-- MP
Menu - Test Mode
Screen
Test Mode
IndpOutputs
Cooling
Heating
Contents
BACnet Object
Field Service Test
svc_test
Independent Outputs
svc_test
test_sf
test_eco
test_x2
Test Cooling
svc_test
test_c1
test_c2
test_hmz
Test Heating
svc_test
test_h1
test_h2
Current State
Test Mode
Supply Fan
Economizer Damper Position
Power Exhaust
Test Mode
Compressor 1
Compressor 2
Dehumidification Mode
Test Mode
Heat 1
Heat 2
Range
Units
Editable
Off / On
Y
Off / On
Off / On
0--- 100
Off / On
Y
Y
Y
Y
%
Off / On
Off / On
Off / On
Off / On
Y
Y
Y
Y
Off / On
Off / On
Off / On
Y
Y
Y
Menu - Inputs
Screen
Inputs
Contents
Analog Inputs
Space Temperature Sensor
Supply Air Temperature
Local Outside Air Temp Sensor
Outdoor Air Relative Humidity
Outdoor Air Quality
Space Relative Humidity
Indoor Air Quality
Binary Inputs
Safety Chain Feedback
Compressor Safety Status
Fire Shutdown
Enthalpy Switch
Humidistat Input Status
Filter Status
Supply Fan Status
Remote Occupancy Input
Network Inputs
Outside Air Temp (BACnet)
Enthalpy (BACnet)
BACnet Object
Input Points
Range
sptsens
sat
oatsens
oarh
oaq
sprh
iaq
xxx.x
xxx.x
xxx.x
xxx
xxx
xxx
xxx
safety
compstat
firedown
enthalpy
humstat
filtstat
fanstat
remocc
Off / Run Enabled
Normal / Trouble
Run Enabled / Shutdown
High / Low
Low / High
Clean / Dirty
Off / Running
Off / On
oat
enthalpy_net
xxx.x
High / Low
Units
dF
dF
dF
%RH
PPM
%RH
PPM
Editable
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
dF
N
N
Menu - Outputs
Screen
Outputs
Contents
Binary Outputs
Supply Fan Relay State
Compressor 1 Relay State
Compressor 2 Relay State
Heat 1 Relay State
Heat 2 Relay State
Dehumidification Relay State
Power Exhaust Relay State
Analog Output
Economizer Commanded Pos.
BACnet Object
Output Points
sf
comp_1
comp_2
heat_1
heat_2
humizer
aux_2
econocmd
28
Range
Units
Off / On
Off / On
Off / On
Off / On
Off / On
Off / On
Off / On
Editable
N
N
N
N
N
N
N
%open
N
APPENDIX A — LOCAL ACCESS DISPLAY TABLES (CONT)
Menu - Alarms
Screen
Alarm Status
Alarm History
Timed ---Alarms Manual Resets
Contents
BACnet Object
Range
Active Alarms
safety_chain
OFF / ACTIVE
fire_alarm
OFF / ACTIVE
spt_alarm
OFF / ACTIVE
sat_alarm
OFF / ACTIVE
spt_hi
OFF / ACTIVE
spt_lo
OFF / ACTIVE
sat_hi
OFF / ACTIVE
sat_lo
OFF / ACTIVE
sf_fail
OFF / ACTIVE
sf_hand
OFF / ACTIVE
dx_compstat
OFF / ACTIVE
slide_alarm
OFF / ACTIVE
filter
CLEAN / DIRTY
sw_cfg_alarm
OFF / ACTIVE
an_cfg_alarm
OFF / ACTIVE
oat_alarm
OFF / ACTIVE
sprh_alarm
OFF / ACTIVE
oarh_alarm
OFF / ACTIVE
sprh_hi
OFF / ACTIVE
sprh_lo
OFF / ACTIVE
iaq_alarm
OFF / ACTIVE
oaq_alarm
OFF / ACTIVE
co2_hi
OFF / ACTIVE
sf_rntm
OFF / ACTIVE
dx1_rntm
OFF / ACTIVE
dx2_rntm
OFF / ACTIVE
Module Event History (100 most recent)
Active Alarms
Buffer
Active Faults
Buffer
Returned --- To--- Normal (RTN)
Buffer
Manually Cleared (CLR)
Buffer
Timed --- Alarm Resets
Dirty Filter Alarm
flts_rt_clear
RUN / CLEAR
Supply Fan Runtime Expired
sf_rt_clear
RUN / CLEAR
Compressor 1 Runtime Alarm
c1_rt_clear
RUN / CLEAR
Compressor 2 Runtime Alarm
c2_rt_clear
RUN / CLEAR
Safety Chain Alarm
Fire Shutdown Alarm
Space Temp Sensor Failure
SAT Sensor Alarm
High Space Temp Alarm
Low Space Temp Alarm
High Supply Air Temp
Low Supply Air Temp
Supply Fan Failed to Start
Supply Fan in Hand
Compressor Safety Alarm
Setpoint Slider Alarm
Dirty Filter Alarm
Switch Configuration Alarm
Misconfigured Analog Input
OAT Sensor Alarm
Space RH Sensor Alarm
Outside RH Sensor Alarm
High Space Humidity
Low Space Humidity
IAQ Sensor Alarm
OAQ Sensor Alarm
High Carbon Dioxide Level
Supply Fan Runtime Expired
Compressor 1 Runtime Alarm
Compressor 2 Runtime Alarm
29
Editable
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Y
Y
Y
Y
RTU-- MP
Alarms
APPENDIX A — LOCAL ACCESS DISPLAY TABLES (CONT)
Menu - Schedules
Screen
Schedules
RTU-- MP
Daily
Contents
Status
Day and Time
Occupancy Source:
T55/56 Override Duration
Use?
Stat:
Start Time
Days
Use?
Stat:
Start Time
Stop Time
Override
occ_source
ovr_dur
hr
Daily Sch X
Stop Time
Holiday
BACnet Object
Units
Occupancy Config.
occ_status
Month
Day
Use?
Stat:
Start Time
Stop Time
Month
Day
use_norX
schX_stat
norm_bhX
norm_bmX
norm_ehX
norm_emX
mon_normX
tue_normX
wed_normX
thurs_normX
fri_normX
sat_normX
sun_normX
Holiday Sch X
use_holX
holX_stat
hol_bhX
hol_bmX
hol_ehX
hol_emX
hol_monX
hol_dayX
Override Sch X
use_ovrX
ovrX_stat
ovr_bhX
ovr_bmX
ovr_ehX
ovr_emX
ovr_monX
ovr_dayX
NOTE: The “X” above represents the number of a specific schedule. There
are 4 Daily Schedules, 12 Holiday Schedules and 2 Override Schedules
30
Range
Editable
Unoccupied / Occupied
Always Occupied
Local Schedule
BACnet Schedule
BAS On/Off
DI On/Off
0--- 24
(24hr)
No / Yes
Off / On
0--- 23
0--- 59
0--- 23
0--- 59
MON or --TUE or --WED or --THU or --FRI or --SAT or --SUN or --(24hr)
No / Yes
Off / On
0--- 23
0--- 59
0--- 23
0--- 59
0--- 12
0--- 31
(24hr)
No / Yes
Off / On
0--- 23
0--- 59
0--- 23
0--- 59
0--- 12
0--- 31
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
APPENDIX A — LOCAL ACCESS DISPLAY TABLES (CONT)
Menu - Configuration
Cooling
Heating
Inputs
IAQ
CLOCKSET
DST
USERPW
Default Value
Unit Configuration
5
600
0
0
0
Cooling Configuration
One Stage*
Start Delay
Filter Service Hours
Supply Fan Service Hours
Compressor1 Service Hours
Compressor2 Service Hours
startdelay
flts_service
sf_service
c1_service
c2_service
Number of Compressor stages
nu_cl_stgs
Cooling/Econ SAT Low Setpt
Cooling Lockout Temp
sat_low
oatlcool
HeatPump RTU?
Heating SAT High Setpt
Heating Lockout Temp
heatpump
sat_high
oatlheat
Binary Inputs
Input 3
inp_03_func
Compressor
Safety
Input 5
inp_03_sw
inp_05_func
N/O
Fire Shutdown
Input 8
inp_05_sw
inp_08_func
N/C
No Function
Input 9
inp_08_sw
inp_09_func
N/O
Humidistat
inp_09_sw
N/O
spt_type
T55 Type
Input 1 Function
inp_01_func
No Sensor
Input 2 Function
inp_02_func
No Sensor
Setpoint Slider Range
T55/56 Override Duration
IAQ Low Reference @ 4mA
IAQ High Reference @ 20mA
OAQ Low Reference @ 4mA
OAQ High Reference @ 20mA
spo_range
ovr_dur
iaq_4ma
iaq_20ma
oaq_4ma
oaq_20ma
Economizer Exists
Economizer Minimum Position
Economizer High OAT Lockout
Power Exhaust Setpt
Continuous Occ Exhaust
econ_exist
economin
oatlecon
pesetpt
occ_exh
Max Differential CO2 Setpt
IAQ Greatest Min Dmpr Pos
co2_stpt
iaq_max_dpr
Analog Inputs
Space Sensor Type
Economizer
BACnet
Object
Contents
Time (hh:mm:ss):
Date (dd--- mmm--- yy):
50
45
Heating Configuration
No*
120
65
Input Configuration
Units
Range
sec
hr
hr
hr
hr
0--- 600
xxxx; 0 = Disable Alarm
xxxx; 0 = Disable Alarm
xxxxx; 0 = Disable Alarm
xxxxx; 0 = Disable Alarm
Y
Y
Y
Y
Y
Y
dF
dF
One Stage
Two Stage
None
45--- 75
0--- 65
dF
dF
No / Yes
95--- 150
45--- 95
Y
Y
Y
No Function
Compressor Safety
Fan Status
Filter Status
Remote Occupancy
N/O / N/C
No Function
Fire Shutdown
Fan Status
Filter Status
Remote Occupancy
N/O / N/C
No Function
Enthalpy Switch
Fan Status
Filter Status
Remote Occupancy
N/O / N/C
No Function
Humidistat
Fan Status
Filter Status
Remote Occupancy
N/O / N/C
Y
T55 Type
T56 Type
RS Type
No Sensor
IAQ Sensor
OAQ Sensor
Space RH Sensor
Outdoor RH Sensor
No Sensor
IAQ Sensor
OAQ Sensor
Space RH Sensor
Outdoor RH Sensor
0--- 15
0--- 24
0--- 400
0--- 5000
0--- 400
0--- 5000
Y
No / Yes
0--- 100
55--- 80
20--- 90
No / Yes
Y
Y
Y
Y
Y
300--- 950
10--- 60
Y
Y
5
^dF
1
hr
0
PPM
2000
PPM
0
PPM
2000
PPM
Economizer Configuration
No*
20
%
75
dF
50
%
No
Indoor Air Quality Configuration
650
PPM
50
%open
Set Current Time/Date (24 hr clock)
0000
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
0000--- 9999
* These defaults change based on unit and FIOPs. The shown defaults are single compressor non--- heat pump units without economizers.
31
Y
Y
Y
Y
DST
Start Time:
Amount:
Entry #
Beg (mm--- dd--- yy)
End (mm--- dd--- yy)
View/Set User
Password:
Editable
Y
RTU-- MP
Screen
Config
Unit
APPENDIX A — LOCAL ACCESS DISPLAY TABLES (CONT)
Menu - Network
Network
Screen
Contents
BACnet Object
Network
Info
this_device/64
this_device/63
BACnet Device Instance:
Base BACnet Device ID:
Autogenerate Device ID?
Max Masters
Max Info Frames
BACnet
Range
1--- 127
1--- 999
Editable
Y
Y
Menu - Help Screens
TYPE
Configuration
Start Delay
Screen
RTU-- MP
Cooling/Econ SAT Low Setpt
Cooling Lockout Temp
Heating SAT High Setpt
Heating Lockout Temp.
Economizer Minimum Position
Economizer High OAT Lockout
Power Exhaust Setpt
Continuous Occ Exhaust
Max Differential CO2 Level
Alarms
IAQ Greatest Min Dmpr Pos.
Safety Chain Alarm
Fire Shutdown Alarm
Space Temp Sensor Failure
SAT Sensor Alarm
High Space Temp Alarm
Low Space Temp Alarm
High Supply Air Temp
Low Supply Air Temp
Supply Fan Failed to Start
Supply Fan in Hand
Compressor Safety Alarm
Setpoint Slider Alarm
Dirty Filter Alarm
Switch Configuration Alarm
Misconfigured Analog Input
OAT Sensor Alarm
Space RH Sensor Alarm
Outdoor RH Sensor Alarm
High Space Humidity
Low Space Humidity
IAQ Sensor Alarm
OAQ Sensor Alarm
High Carbon Dioxide Level
Network
Supply Fan Runtime Alarm
Compressor 1 Runtime Alarm
Compressor 2 Runtime Alarm
Info
Copyright 2007 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231
Contents
Defines number of seconds after power up the unit must wait before normal operation.
Defines the minimum SAT allowed during cooling and economizer mode.
Defines the minimum OA temp allowed during cooling mode.
Defines the maximum SAT allowed during heating mode.
Defines the maximum OA temp allowed during heating mode.
Defines the minimum damper position of the economizer during occupied periods.
Defines the maximum OA temp which will allow the unit to run in economizer mode.
Defines the economizer damper position that enables power exhaust operation.
Defines continuous power exhaust operation during occupied periods.
Defines the maximum difference between the indoor and outdoor air quality to maintain healthy indoor air.
Defines the minimum OA damper position for maintaining indoor air quality.
When a supply fan overload or electric heat limit opens, the 24 VAC at TB--- 1(R) will be
lost.
The smoke detector has opened and the 24VAC at TB4--- 7 is lost.
The sensor is missing or shorted.
The sensor is missing or shorted.
The space temperature has risen above the cooling setpoint by more than the desired
amount.
The space temperature has dropped below the heating setpoint by more than the
desired amount.
The supply air temperature sensor is reading above 160F.
The supply air temperature sensor is reading below 35F.
The control logic is commanding the supply fan ON, but senses the fan is OFF.
The control logic is commanding the supply fan to be OFF, but senses the fan ON.
A compressor lockout board has locked out it’s compressor.
The setpoint slider voltage is out of range.
The Filter runtime has exceeded the configurable alarm timer limit, or the filter status
switch has tripped or configuration is wrong.
More than one binary input is configured for the same function.
More than one analog input is configured for the same function.
The outdoor air temperature sensor is missing or shorted. The OAT sensor is required
if Economizer Exists configuration point is set to Yes.
The sensor is missing or shorted.
The sensor is missing or shorted.
The space relative humidity sensor is reading above 70%RH.
The space relative humidity sensor is reading below 30%RH.
The sensor is missing or shorted.
The sensor is missing or shorted.
The Carbon dioxide level in the space has exceeded the configured limit. CO2 reading is above 1200ppm
The Supply fan runtime has exceeded the configurable alarm timer limit.
A compressor runtime has exceeded the configurable alarm timer limit.
A compressor runtime has exceeded the configurable alarm timer limit.
To access the module status report press the ”FN” and ”.” buttons simultaneously.
Printed in U.S.A.
Edition Date: 12/07
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
32
Catalog No:48---50H ---T ---2T
Replaces: 48--- 50H--- T--- 1T