50rlp-1pd
Product
Data
50RLP
Water Source Heat Pumps
System Control Panel
TM
Single packaged system control panel
for use with Aquazone™ water source
heat pumps in stand-alone or direct
digital control applications using the
Carrier Comfort Network (CCN).
• Includes pre-programmed 6400
main logic controller
• Compatible for use in boiler/tower or
geothermal WSHP arrangements
• Controls up to two water-circulating
pumps
• Monitors water temperature and
initiates up to eight stages of
cooling tower and/or boiler
operation
• Capability to work with variable
speed pumping arrangements for
maximum energy efficiency
• Provides system control for both
stand-alone and DDC WSHP
systems
• Controls up to 18 zones of WSHP
units in stand-alone operation
• Works with factory-installed
PremierLink™ controllers on WSHP
units in a DDC type system
Features/Benefits
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Carrier’s Aquazone System
Control Panel provides the
ultimate solution for
coordinating, monitoring,
and managing boiler/tower or
geothermal water source
heat pump (WSHP) systems.
Flexible controls for all WSHP
system applications
Whether your water source heat pump
system design involves a boiler tower,
geothermal or variable speed pumping arrangement, Carrier’s Aquazone
System Control Panel has the capability to adapt.
Copyright 2002 Carrier Corporation
Form 50RLP-1PD
The diverse functionality of this multipurpose loop control panel design
makes it one the most user friendly and
complete loop controllers available. This
unique and sophisticated control panel
was designed to work exclusively with
Carrier Aquazone™ water source heat
pump products including all variations
and styles of horizontal, vertical, console,
rooftop, and water-to-water products.
The functionality of the panel provides
simple to complex operating strategies
to maximize energy efficiency and
manage coordination for the WSHP
units, as well as, typical ancillary equipment such as multiple boilers, cooling
towers, and pumps.
Choice of control strategies
for Aquazone WSHP systems
The Aquazone System Control Panel
accommodates both stand-alone and
direct digital control (DDC) for Aquazone WSHP units.
Stand-alone WSHP unit operation
(non-communicating)
All Aquazone water source heat pumps
feature state-of-the-art microprocessorbased unit controllers. The standard
Complete C unit controller package
provides all the advantages of Carrier
controls engineering including random
start, refrigerant protection, voltage
protection, automatic intelligent reset,
accessory outputs, water temperature
monitoring, water and air coil freeze
protection, alarm relays, and LED visual output.
For more sophisticated features, a larger transformer, and multiple accessory
options, the Deluxe D unit controller
can be selected as an upgrade.
Both the Complete C or Deluxe D
options are selected as part of the
Aquazone product model nomenclature. Stand-alone unit control and
operation can be accomplished with
either controller in combination with a
choice of thermostats specifically
designed for the Aquazone family of
products. When utilizing the Aquazone system control panel with this
type of controls strategy, occupancy
schedules for up to 18 zones of water
source heat pump units can be controlled. In addition, system information
from circulating pumps, cooling towers, and boilers are managed and
coordinated to control heat rejection,
addition, and water circulation.
Direct Digital Control (DDC)
WSHP unit operation
For a more sophisticated control strategy, the Aquazone System Control
Panel is utilized in conjunction with
water source heat pump units with
factory-installed PremierLink™ communicating controllers. In this fashion,
water source heat pump information
from the PremierLink controllers is
sent over the Carrier Comfort Network
(CCN) to a central computer terminal,
enabling convenient monitoring, control, and diagnostic capabilities for the
system.
Implementing a DDC system is as simple as specifying the PremierLink option in any Aquazone model nomenclature. PremierLink controllers provide
the best type of temperature control
available and the flexibility to control all
modes of operation. PremierLink controllers transmit unit number, zone
temperature, zone temperature set
points, discharge air temperature, fan
status, stages of heating, stages of
cooling, leaving-water temperature,
and alarm status information.
In combination with the System
Control Panel’s ability to control and
monitor ancillary equipment, this
approach may be the most user
friendly, cost effective, and complete
water source heat pump control
system ever developed.
Manage and control the entire
WSHP system
No matter what the application
requirements are for loop water temperature flow and temperature control,
Table of contents
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-9
2
the Aquazone System Controller
provides the ultimate in flexibility to
accommodate all systems. In addition
to incorporating water source heat
pump units, the System Control Panel
also integrates several control schemes
for monitoring and controlling the
three most common ancillary equipment types, which include heat rejection equipment such as cooling towers,
adding heat to the water loop with boilers or heat exchangers, and water circulation pumps.
Heat rejection and additional
equipment
In a typical water source heat pump
system, the common water loop,
which is connected to all the individual
WSHP units, is maintained between
60 F and 95 F for a boiler/tower type
system (by the heat rejection and addition equipment). Within this temperature range, units can cool or heat as
required from the same water source.
In applications involving a ground
loop, ground water, or other geothermal heat source or sink, the minimum
loop temperature may be designed to
extend below 60 F. The system control
panel coordinates and controls all ancillary equipment to achieve the design
objectives for the water loop.
Water circulation
The most typical system water flow
application involves a continuous,
constant, flow-type system, with water
circulation via one or two pumps. The
system control panel has the capability
to control one or two pumps in start/
stop or lead/lag operation.
However, in some applications, a
variable pumping arrangement may be
utilized to further conserve energy beyond the existing efficient operation of
any water source heat pump system.
This type of system is easy to implement with all Aquazone WSHP products and the System Control Panel.
Systems of this type require the capability to handle variable flow, which is
made easy with the factory installation
of two-way water control valves on
most Aquazone WSHP products. In
addition, the System Control Panel
includes the unique capability to operate circulation pumps for a variable
speed operation. The Aquazone System Control Panel is the only WSHP
loop controller that has this capability
in the industry.
Features/Benefits (cont)
Specific operational capabilities to control the WSHP units
and ancillary equipment
WSHP zone operation — When a
dedicated thermostat is utilized for
each unit, occupancy schedules for
coordinating either 10 or 18 zones
may be selected. These schedules may
be broadcast over the communications
network to coordinate occupancy control of each zone with a Carrier 6400
controller or other CCN controllers.
Schedules may also be used to drive
discrete outputs on up to two accessory input/output modules. These outputs will control relays to coordinate
occupancy of non-communicating (i.e.,
without PremierLink™ controller)
water source heat pumps and
thermostats. When any schedule is
occupied, the System Controller will
control the pumps to maintain water
flow to the heat pumps and maintain
the loop temperatures within the
required temperature range for the
system.
Networked systems — For network
applications, the system control panel
supports many network functions as
part of a CCN-type of installation.
These include (but are not limited to)
machine operation, data reporting/
modification, data collection, alarms
and diagnostics, occupancy/timed
override, and broadcast.
Cooling towers (heat rejection) —
Five modes of operation may be utilized including: 2, 4, 6, or 8 stages of
operation, or the capability to send out
a 4 to 20 mA signal for variable speed
operation of the cooling tower fans.
Boilers (heat addition) — Five
modes of operation may be utilized
including: 2, 4, 6, or 8 stages of operation, or control of a modulating hot
water/steam valve for a hot water or
steam to water heat exchanger via a 4
to 20 mA signal.
Circulating pumps — Multiple control options are available for circulation
pumps including start/stop or lead/lag
operation for single or dual pumps.
Also included is the unique option to
implement a variable speed flow operation with the capability to send a 4 to
20 mA signal to control variable speed
motors.
Model number nomenclature
50
RLP
0
0
0
0
Unit Type
50 – Heat Pump
WSHP Zone Operation
0 – 10 Relays, Control 10 Zones for Stand-Alone WSHP Units*
1 – 18 Relays, Control 18 Zones for Stand-Alone WSHP Units*
2 – No Relays, Carrier Comfort Network (CCN) System†
Series
RLP – Aquazone™ System Control Panel
System Pumping Operation
0 – Both Relays, Start/Stop or Lead/Lag Operation for Single or
Dual Pumps
1 – No Relays, Variable Frequency Pump Operation**
System Heat Rejection
0 – 2-Stage Card (2 Stages of Cooling Tower Operation)
1 – 4-Stage Card (4 Stages of Cooling Tower Operation)
2 – 2 and 4-Stage Cards (6 Stages of Cooling Tower Operation)
3 – Two 4-Stage Cards (8 Stages of Cooling Tower Operation)
4 – No Card, Variable Speed Cooling Tower Operation
System Heat Addition
0 – 2-Stage Card (2 Stages of Boiler Operation)
1 – 4-Stage Card (4 Stages of Boiler Operation)
2 – 2 and 4-Stage Cards (6 Stages of Boiler Operation)
3 – Two 4-Stage Cards (8 Stages of Boiler Operation)
4 – No Card, Modulating Valve Operation for Steam or
Hot Water
*Option is utilized with Aquazone Thermostat for each WSHP unit.
†Option is utilized with PremierLink DDC control option on individual WSHP units.
**Accepts signals from a variable frequency device.
3
Dimensions
HOA
Processor
Input/Output 1
Input/Output 2
Low Voltage
Zone Thermostat
Control Relays
Pump 1
Pump 2
MODE
FLT SEQ
MODE
FLT SEQ
UCS-421
INPUT
TYPE
H3
H4
V
H5
MA
SIGNAL
INPUT
CHAIN
OUTPUT
D
C
B
24V
POWER
A
CH
D
C
COMMON
B
A
Cool Stages 1
MODE
FLT SEQ
MODE
FLT SEQ
UCS-421
INPUT
TYPE
H3
V
H5
MA
CHAIN
OUTPUT
H4
SIGNAL
INPUT
D
C
B
24V
POWER
A
CH
D
C
COMMON
B
A
Cool Stages 2
MODE
FLT SEQ
MODE
FLT SEQ
UCS-421
INPUT
TYPE
H3
V
MA
CHAIN
OUTPUT
H4
H5
SIGNAL
INPUT
D
C
B
24V
POWER
A
CH
D
C
COMMON
B
A
Heat Stages 1
MODE
FLT SEQ
MODE
FLT SEQ
UCS-421
INPUT
TYPE
H3
D
V
H5
MA
CHAIN
OUTPUT
C
H4
SIGNAL
INPUT
B
CH
D
C
24V
POWER
A
B
COMMON
A
Heat Stages 2
PANDUCT®
WIRING DUCT
Transformer 1
Transformer 2
Transformer 3
POWER SWITCH
CONVENIENCE
OUTLET
CONDUIT
4
Specifications
Description
The 50RLP Aquazone™ System Control Panel is designed
to allow a service person or building owner to configure,
operate, and efficiently manage a water source heat pump
system. The panel consists of Carrier 6400 Comfort
Controllers and can be used in both stand-alone and CCN
applications. The panel includes room to add up to two
input/output modules for extended timeclock control of a
system thermostat controller for non-communicating
WSHPs. The panel also allows for the installation of
staged output transducers for each of the heat source and
heat rejection source analog outputs.
Electrical characteristics
The control panel is powered from a nominal 24 vac
power source.
Communications
Adjustable from 9600, 19,200, and 38,400 bps.
Dimensions
Height: 42 inches
Width: 30 inches
Depth: 7 inches
Service dimensions
Height: 54 inches
Width: 42 inches
Depth: 36 inches
Specified sensing temperature range
Water and air temperature sensor range: –40 to 245 F
System differential pressure range: 0 to 50 psi.
Panel input/output connections, types, and
ratings
Processor module
Loop Water Flow: Digital Input (24 VDC)
System Supply Water Temperature: Analog Input
(10K thermistor)
System Return Water Temperature: Analog Input
(10K thermistor)
System Differential Pressure: Analog Input (4-20 mA)
Remote Occupied Mode: Digital Input (24 vdc)
System Shut Down: Digital Input (24 vdc)
Override Input for Zones 1 and 2: Digital Input (24 vdc)
Pump Number 1 and 2 Speeds: 4-20 mA
Cooling Tower 1 and 2 Speed/Level: 4-20 mA
Heat Source 1 and 2 Speed/Level: 4-20 mA
System Enable for Zone 1 and 2: Digital Output (24 vdc)
First optional I/O module
Override Input for Zone 3 to 10: Digital Input (24 vdc)
System Enable for Zone 3 to 10: Digital Input (24 vdc)
Second optional I/O module
Override Input for Zone 11 to 18: Digital Input (24 vdc)
System Enable for Zone 11 to 18: Digital Input (24 vdc)
Pump control
Occupancy Schedule 65 to 82: Internal Parameter
Override Input 1 to 18: Discrete Inputs
System Enable Outputs: Discrete Outputs
Remote Occupied Mode: Discrete Input
System Differential Pressure: Analog Input
System Differential Pressure Set Point: User Configuration
Loop Water Flow: Discrete Input
Control Type: User Configuration
Pump Number 1 and 2 Speeds: Analog Output
Shut Down Command: Communicated Output
Heat rejection control
System Supply Water Temperature: Analog Input
System Return Water Temperature: Analog Input
System Loop Temperature Set Points: User Configuration
Fluid Cooler/Tower Control Type: User Configuration
Loop Water Flow: Discrete Input
Cooling Tower 1 and 2 Speed/Level: Analog Output
Heat addition control
System Supply Water Temperature: Analog Input
System Return Water Temperature: Analog Input
System Loop Temperature Set Points: User Configuration
Boiler Control Type: User Configuration
Loop Water Flow: Discrete Input
Boiler 1 and 2 Speed/Level: Analog Output
Network supported functions
Machine Operation: Set point, configuration control,
and forcing of input/output states from Service Tool,
ComfortVIEW™, or ComfortWORKS® software.
Data Reporting/Modification: Reporting of operating
data, including all status display screens to ComfortVIEW,
Service Tool, or ComfortWORKS software.
Data Collection: Providing a set of software and/or hardware points for data collection and tracing.
Alarms and Diagnostics: Reporting of alarm/alerts and
return-to-normal conditions to CCN.
Occupancy/Timed Override: Time schedule/occupancy
control with the capability to operate in several
configurations.
Broadcast — Integrated with the controller software to receive time, day of week, and date messages from CCN.
Compliance and approvals
Listed under UL 873. CE Mark, CSA compliant
5
Typical wiring diagram
A
C
B
E
D
LOW VOLTAGE CONTROL WIRING
GRN
BLK
RED
RED
16
15
14
13
12
11
10
9
J4
8
SW1
12345678 1
7
0
6
SW2
5
1 2 3 4 5 6 7 8 INT
EXT
4
SW3
3
12345678
2
SW4
12345678
1
TBP
1
T1
CB1
BLU
B
GRN
24 V
TBP
YEL
Y
1
BLK
FLOW
7 SYSZ1 8
7 FLOW 8
OTHER
BLRL2
Common
Signal
Input
Chan
Output
24 VAC
Signal
Input
Chan
Output
Common
24 VAC
BLRL1
4-20mA
Common
Signal
Input
Chan
Output
24 VAC
7 SYSZ2 8
Common
Signal
Input
Chan
Output
1
J2 2
3
24 VAC
1
PCB1
Loop Panel
0-10VDC
4-20mA
CTL2
TB1
AO
8
7
6
5
OVRZ1
4
3
ALLSYS
1
RMTOCC
2
RED
OFF
CTL1
OVRZ2
AUTO
SW
PUMP2
ON
OFF
+
-
SDP
AUTO
SW
PUMP1
SRWT
ON
SSWT
4
6
RED
FLOW
RED
BLK
WHT
3
SW6
2
18
17
16
1 2 3 4 DO
AO 15
14
13
12
11
10
J3
9
8
7
6
5
4
3
J7
2
3 2 1
1
1 2 3 4 DO
3
2
SW5
3 2 1
J7
GRN
1
2
J2 3
BRN
RED
TBP
3
X1
BLU
BRN
T2
CB2
24 V
GRN
4
16
15
14
13
12
11
10
9
J4
8
SW1
7
12345678 1
0
6
SW2
5
1 2 3 4 5 6 7 8 INT
EXT
4
SW3
3
12345678
2
SW4
1
12345678
RED
4
PCB2
YEL
X2
4-20mA
OTHER
0-10VDC
7 SYSZ10 8
BRN
7 SYSZ9 8
BRN
7 SYSZ8 8
BRN
7 SYSZ7 8
BRN
18
17
AO
16
SW6
1 2 3 4 DO 15
AO
14
13
12
11
10
J3
9
8
7
6
5
4
To
3
PCB2
2
J7
1
TB3
8
7
OVRZ10
6
5
OVRZ9
4
3
OVRZ8
2
1
OVRZ7
8
7
OVRZ6
6
5
OVRZ5
4
3
OVRZ4
2
1
OVRZ3
BRN
7 SYSZ5 8
BRN
7 SYSZ4 8
BRN
7 SYSZ3 8
BRN
GRN
1
3 2 1
2
J7
J2 3
PCB3
16
15
14
13
12
11
10
9
J4
8
SW1
7
12345678 1
0
6
SW2
5
1 2 3 4 5 6 7 8 INT
EXT
4
SW3
3
12345678
2
SW4
1
12345678
6
BRN
RED
TBP
5
X1
BLU
BRN
T3
CB3
24 V
GRN
4
RED
6
4
7 SYSZ6 8
TB2
RED
BLK
WHT
5
1 2 3 4 DO
5
4-20mA
SW5
YEL
X2
7
7
4-20mA
OTHER
0-10VDC
7 SYSZ18 8
BRN
7 SYSZ17 8
BRN
7 SYSZ16 8
BRN
7 SYSZ15 8
BRN
7 SYSZ14 8
BRN
7 SYSZ13 8
BRN
7 SYSZ12 8
BRN
7 SYSZ11 8
BRN
4-20mA
18
17
AO
16
4 DO 15
AO
14
13
12
11
10
J3
9
8
7
6
5
4
3
2
1
SW6
8
5
1 2 3
7
OVRZ18
5
OVRZ17
4
3
OVRZ16
2
1
OVRZ15
8
7
OVRZ14
6
5
OVRZ13
4
3
OVRZ12
2
1
OVRZ11
TB4
A
6
8
6
B
C
D
E
5
TB5
1 2 3 4 DO
8
SW5
Guide specifications
HVAC Guide Specifications — Aquazone™
System Control Panel
Carrier Model Number:50RLP
Part 1 — General
1.01 DEVICE DESCRIPTION
A. The system control panel shall consist of a centrally
located, pre-programmed microprocessor-based
control panel with the capability to coordinate, manage, and operate a water source heat pump system.
B. The system control panel shall be CE Mark, CSA
and UL 873 recognized.
Part 2 — Products
2.01 GENERAL DESCRIPTION
A. The system control panel shall be factory tested and
assembled and have the capability to operate and
manage both water source heat pump units and
ancillary equipment including circulation pumps and
heat rejection/addition equipment.
B. The system control panel shall provide loop control
functions for systems with stand-alone (i.e., noncommunicating) water source heat pumps, installed
with normal thermostats.
C. The system control panel shall accommodate and
work in a direct digital control (DDC) type of system
operation with water source heat pumps having
factory-mounted PremierLink™ controls or other
CCN (Carrier Comfort Network) communicating
controls.
D. The central main logic processing control module
shall consist of a 6400 comfort controller, preprogrammed and packaged in a NEMA rated enclosure. The panel enclosure shall have a lockable
access door to prevent unauthorized access.
E. The system control panel display shall be factory
mounted on the front side of the enclosure. The display shall provide access to all operating and configuration parameters in the loop controller panel not
limited to but including: loop water temperatures,
control valve position, tower speed, number of
stages active for heat addition or rejection, pump
speed, pumps active, indication of water flow, and
system differential pressure.
F. The system control panel shall have the capability to
include one additional input/output module for
extended timeclock control of up to 10 noncommunicating water source heat pump zones.
The input/output module shall control a set of
relays to coordinate occupancy schedules for noncommunicating water source heat pumps.
G. The system control panel shall have the capability to
include a second input/output module for extended
timeclock control of up to 18 non-communicating
water source heat pump zones. The input/output
module shall control a set of relays to coordinate
occupancy schedules for non-communicating water
source heat pumps.
H. The system control panel shall include a set of
staged output transducers, relays, and sensors for
2, 4, 6, or 8 stages of heat rejection equipment
operation.
I. The system control panel shall include a set of
staged output transducers, relays, and sensors for
2, 4, 6, or 8 stages of heat addition equipment
operation.
J. The system control panel shall include a set of transducers, relays, and sensors for the control of up to
2 circulation pumps in either start/stop or lead/lag
operation.
K. The system control panel shall include basic 4 to
20 mA controller outputs to control a variable speed
motor for heat rejection fans, to control a variable
speed motor for water circulation pumps, and to
modulate a hot water/steam valve.
2.02 OPERATION
A. Functional:
1. The system control panel shall coordinate the
start and stop of the water loop circulating
pumps and control the water temperature of
the water delivered to the water source heat
pump units.
2. The system control panel shall coordinate the
shut down of the system in case of fire, loss of
water flow, or excessively high or low water
temperatures. The system heat rejection equipment will be controlled as needed to maintain
the specified loop water temperature.
B. System:
1. The system control panel shall provide up to 10
or 18 designer specified occupancy schedules
for coordinating up to 10 or 18 zones of water
source heat pumps.
2. System control panel shall have the capability
to broadcast schedules over the communications network to coordinate occupancy control
of each zone.
3. System control panel shall have the capability
to drive discrete outputs for schedules on up to
two accessory input/output modules.
4. Input/output modules shall have the capability
to control relays to coordinate occupancy of
non-communicating water source heat pump
units and thermostats.
5. The system control panel shall control water
pumps to maintain water flow to the heat
pumps and maintain the loop temperatures
within the required temperatures for the water
source heat pumps to operate when any schedule is occupied.
7
Guide specifications (cont)
2.03 NETWORK CAPABILITIES
A. Supported Functions:
1. Machine operation shall include set point
and configuration control from Service Tool,
ComfortVIEW™, or ComfortWORKS® software. Forcing of input or output states shall
be from Service Tool, ComfortVIEW, or
ComfortWORKS software.
2. Data reporting and modification shall include
reporting of operating data, including all status
display screens, to ComfortVIEW, Service Tool,
or ComfortWORKS software.
3. Data collection shall include providing a set of
software and/or hardware points for data collection and tracing.
4. Alarms and diagnostics shall include reporting
of alarm/alerts and return to normal conditions
on CCN.
B. Network Support Functions:
Network support functions shall be supported when
implementing the system control panel as part of a
CCN system.
1. The occupancy/timed override POC (product
on board command) function shall have the
capability of existing on the controller on a
stand-alone basis.
2. The system control panel shall have a hardware
clock capable of performing time broadcast
functions for synchronizing equipment clocks
throughout the system.
3. Occupancy/timed override shall include the
time schedule/occupancy control and shall
operate in one of the following modes:
a. Remote Occupancy
b. Local Schedule
c. Global Schedule
d. Receive global schedule from another occupancy POC elsewhere on CCN.
Part 3 — Execution
3.01 SEQUENCE OF OPERATION
A. Heat Rejection:
1. When the system pumps are operating and
there is flow to the system, heat rejection control shall compare the system supply water temperature to the high set point in the system
loop temperature set points.
2. If the system supply water temperature
approaches the high set point, the controller
shall command the heat rejection outputs to
hold the system supply water temperature as
close as possible to the high set point.
3. If the system return water temperature drops
below the system high water temperature set
point minus a hysteresis value the heat rejection, outputs shall be disabled.
8
4. When the cooling tower output control type is
set to “variable,” the heat rejection outputs shall
be calculated using a PID calculation based on
the system high temperature water set point.
Both outputs shall modulate together.
5. When the heat rejection control type is set to
“staged,” the outputs will be modulated in a
lead/lag configuration. The modulating signal
of the lead output will control a transducer of
two or four stages.
6. When the lead output is at 100% and the set
point is not being maintained, the lag output
will be modulated to produce staging from
another two or four stage output transducer.
7. The value output by each analog output shall be
determined by a PID calculation of leaving
water temperature versus the system high leaving water temperature set point.
8. In the event that the system high water temperature set point cannot be maintained and is
exceeded by a defined Hysteresis, the heat
rejection outputs shall go to maximum output,
the system water source heat pumps will stop
cooling, and the system pumps shall circulate
water until the system temperatures are
returned to the normal range. System cooling
will then be allowed to continue.
B. Heat Addition:
1. When the system pumps are operating and
there is flow to the system, boiler control shall
compare the system supply water temperature
to the low set point in the system loop temperature set points.
2. If the system supply water temperature
approaches the low set point, then the controller shall command the boiler outputs to hold the
system supply water temperature as close as
possible to the low set point.
3. If the system return water temperature rises
above the system low water temperature set
point plus a Hysteresis value, the boiler outputs
will be disabled.
4. When the boiler output control type is “variable,” the boiler outputs will be calculated using
a PID calculation based on the system low temperature water set point. Both outputs shall
modulate together.
5. When the boiler control type is set to “staged,”
the outputs shall be modulated in a lead lag configuration. The modulating signal of the lead
output shall control a transducer of two or four
stages.
6. When the lead output is at 100% and the set
point is not being maintained, the lag output
shall be modulated to produce staging from
another two or four stage output transducer.
7. The value output by each analog output shall be
determined by a PID calculation of leaving
water temperature versus the system low leaving water temperature set point.
8. In the event that the system low water temperature set point cannot be maintained and is
exceeded by a defined Hysteresis, the boiler
outputs will go to maximum output, the system
water source heat pumps will stop heating, and
the system pumps will circulate water until the
system temperatures are returned to the normal
range. System heating shall then be allowed to
continue.
C. Water Circulation:
1. When operational mode is determined by one
of the 18 occupancy schedules or occupancy
overrides, then the system pumps shall be put
in operational mode.
2. If one of the system enable outputs is turned
on, then the system pumps shall be put in operational mode.
3. If the remote occupancy input is detected, then
the pumps shall be put in operational mode and
all 18 schedules overridden to on. This shall
energize all 18 system enable outputs.
4. The pump control type shall be configured as
either variable flow or constant flow. When the
pumps are in operational mode, the pump
speed output values shall be determined in one
of two ways:
a. In constant flow mode, the desired output
(one or two) shall be ramped to 100% to
turn the pumps on in a lead/lag fashion,
based on run time.
5.
6.
7.
8.
9.
b. In variable flow mode, both outputs shall be
determined by a Proportional Integral Derivative (PID) calculation, which controls the
system differential pressure set point.
Whenever the runtime of the lead pump
exceeds the runtime of the lag pump by
50 hours or more, then the pump with the
lesser runtime will become the lead pump.
If the lead pump output is at 100% and the
loop water flow input detects no flow, then the
lag pump shall be put to 100% to start the lag
pump. The lead pump shall be ramped back to
zero and alarm condition reported.
At each subsequent start-up, the lead pump will
be tried again. The user may force the lead
pump to start again and turn off the lag pump if
the controller detects this state of conditions.
The forces will be cleared and the alarm condition cleared from the controller.
In the event that the pumps have been commanded to provide water flow but either the
flow switch does not indicate flow or the differential pressure sensor does not indicate pressure is present, then the controller shall assume
the pumps have failed and command the water
source heat pumps to turn off cooling or heat.
The system fans shall continue to circulate the
air.
In the event of a system shutdown command,
the controller shall command the water source
heat pumps to turn off all cooling and heat
sources and circulating fans.
9
Carrier Corporation • Syracuse, New York 13221
10-02
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
New Book 1
Pg 12
Catalog No. 525-00040
Printed in U.S.A.
PC 111
Form 50RLP-1PD
Replaces: New
Tab 1P4a
Tab 5a 5a
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