Open Protocol Data Information Packet
Version 5.0
Group: Controls
Date: April, 96
MicroTech®
Reciprocating Chiller (Italian Manufacture)
Open Protocol™ Data Communications
© 2002 McQuay International
-CONFIDENTIALThis Document may not be copied or reproduced in any way without the express written consent of
McQuay International.
NOTICE
Copyright © 1996
McQuay International, Minneapolis MN
All rights reserved throughout the world.
McQuay International reserves the right to change any information contained herein without prior
notice. No guarantees are given as to the accuracy of information provided.
Version 5.0
2
Contents
Revision History ....................................................................................................................4
Version 5.0............................................................................................................................................ 4
Functional Goals of the Open Protocol for Recip. Chillers...............................................5
Overview............................................................................................................................................... 5
Reciprocating Chillers Included in this Open Protocol Document ....................................................... 5
Typical Open Protocol Control Functions ............................................................................................ 5
Remote Start/Stop of the Chiller ....................................................................................................... 5
Chilled Water Reset .......................................................................................................................... 5
Demand Limit ................................................................................................................................... 6
Remote Alarm Clearing .................................................................................................................... 6
Network Configuration ......................................................................................................................... 6
Communications to a Single Chiller ................................................................................................. 6
Communications to Two or More Chillers........................................................................................ 7
OPM - Open Protocol Master Panel .....................................................................................9
Input/Output Configuration (CR1 Chillers) .......................................................................10
Analog Inputs...................................................................................................................................... 10
Digital Inputs....................................................................................................................................... 10
Digital Outputs.................................................................................................................................... 11
Input/Output Configuration (CR2 Chillers) .......................................................................12
Analog Inputs...................................................................................................................................... 12
Digital Inputs....................................................................................................................................... 12
Digital Outputs.................................................................................................................................... 13
Input/Output Configuration (CR4 Chillers) .......................................................................14
Analog Inputs...................................................................................................................................... 14
Digital Inputs....................................................................................................................................... 15
Digital Outputs.................................................................................................................................... 15
Read Only Memory Locations (CR1 Chillers) ...................................................................17
Read Only Memory Locations (CR2 Chillers) ...................................................................24
Read Only Memory Locations (CR4 Chillers) ...................................................................33
Read and Write Memory Locations ...................................................................................51
Memory locations common to all types of chillers - CR1, CR2, and CR4 ..................................... 51
Memory locations applicable only to CR1 and CR2 chillers .......................................................... 52
Memory locations applicable only to CR4 chillers ......................................................................... 53
Reciprocating Chiller Simulator Package .........................................................................55
Required Development Testing Tools................................................................................................. 55
Setup of Hardware for Testing............................................................................................................ 55
Appendix A - Notes on Read Only Memory Locations ....................................................57
Note on Alarms and Alarm Related Data............................................................................................ 57
Note on Temperatures ......................................................................................................................... 57
Note on Pressures................................................................................................................................ 58
Note on Compressor Operating Hours and Starts ............................................................................... 58
Appendix B - Monitor Screens ...........................................................................................59
Appendix C - Chiller Models...............................................................................................63
GROUP 1 - CR1 Chillers.................................................................................................................... 63
GROUP 2 - CR2 Chillers.................................................................................................................... 63
GROUP 3 - CR4 Chillers.................................................................................................................... 64
Glossary of Terms ...............................................................................................................65
Rated Load AmpsIndex.......................................................................................................66
3
Version 5.0
Revision History
Version 5.0
This is a general upgrade and format change of the document. Formerly, there was a single Open
Protocol™ Data Communications Information Packet (Version 4.1 dated May 26, 1992) that covered
all McQuay® reciprocating chillers of American and Italian manufacture. There is now a separate
document for American-made reciprocating chillers and this document, for Italian-made
reciprocating chillers.
Correction and changes from 4.1 include:
Version 5.0
•
References to SnyderGeneral changed to McQuay International.
•
Reformatting of tables and text concerning controller memory locations.
•
Corrections to the addresses of read/write memory locations for Group 3 chillers.
•
Modification of Circuit Status and Circuit Alarms for Group 2 chillers. Formerly, there was a
single set of Circuit Status values for all Group 2 chillers; there are now different sets of values
for CR2-M1xx series and CR2-M2xx chillers. The same is true of Circuit Alarms.
•
Modification of Circuit Status and Circuit Alarms for Group 3 chillers. Formerly, there was a
single set of Circuit Status values for all Group 3 chillers; there are now different sets of values
for CR4-M1xx series and CR4-M2xx series. The same is true of Circuit Alarms.
4
Functional Goals of the Open Protocol for Recip. Chillers
Overview
The McQuay Open Protocol for reciprocating chillers allows other automation integrators the ability
to communicate to a network of reciprocating chillers or to a single reciprocating chiller and obtain
useful operating information through communication "reads" to the controller. In addition, remote
control of the reciprocating chiller is possible by communication "writes" to the controller of new
setpoints and commands.
Reciprocating Chillers Included in this Open Protocol Document
McQuay International manufactures MicroTech® European chillers using one of three software (and
hardware) configurations. The configurations are summarized as follows:
The asterisk "*" is a
wildcard; characters
may vary.
Configuration
Software IDENT
Usage
Group 3
*R4*****
European chillers above 200 tons.
Group 1
*R1*****
European chillers below 100 tons.
Group 2
*R2*****
European chillers 100 to 200 tons.
Typical Open Protocol Control Functions
Hexadecimal values
are indicated by a
preceding ‘$’.
The Open Protocol allows automation integrators to achieve many control functions which in the
past would require hardwired interfaces between the building automation system (BAS) and the
chiller. Using Open Protocol, it is possible to eliminate much of the expensive field wiring and
provide the interface through communications.
These are the typical Open Protocol control functions:
•
Remote start/stop of the chiller
•
Chilled water reset
•
Demand limit
•
Remote alarm clearing
Remote Start/Stop of the Chiller
Using communication "writes" to the "Network Command" memory location, the McQuay
MicroTech chiller may be commanded to be enabled or disabled. This is the preferred method of
remotely turning the chiller on or off. When the "Network Command" is "Disable," the LCD display
on the chiller will show "Off:RemoteComm."
The memory for "Network Command" is a RAM location that, upon loss and subsequent restoration
of power, is initialized to "Enable." Thus the automation system should refresh this memory location
to the desired state on a frequent basis, such as every minute.
A standard feature of the MicroTech controller is an output dedicated to control of the chiller's
evaporator pump. We recommend using this output to control the pump.
Chilled Water Reset
Chilled water reset is achieved quite easily through communications. See the Network Evaporator
Leaving Chilled Water Temperature Reset.
5
Version 5.0
Demand Limit
An automation system can establish the maximum number of cooling stages that can be active for the
chiller through the "Network Demand Limit" setpoint. This is vital for systems that seek to reduce
chiller capacity at certain times to avoid peak electrical demand charges.
Remote Alarm Clearing
The automation system can clear an active alarm in the MicroTech chiller through communications.
Care should be exercised so that alarms are cleared only by authorized individuals and only when the
cause of the alarm has been corrected and/or repaired.
Network Configuration
This section explains how the McQuay International Open Protocol Reciprocating Chiller Network
works so that you can choose the correct equipment and program your system to communicate
through McQuay International's MicroTech Open Protocol.
There are two scenarios for connecting to the controllers that are used to make an Open Protocol
Reciprocating Chiller Network. They are as follows:
•
Communications to a single chiller
•
Communications to two or more chillers
Communications to a Single Chiller
One port is
configured for
RS-232, 1200 baud
All McQuay MicroTech Reciprocating Chillers are shipped from the factory with one
communications port factory-configured for RS-232, 1200 baud. The port is located on the Control
EnGinn and is designated Port A. This communications port is normally used in conjunction with an
optional factory installed modem.
Since high communication baud rates are usually desirable, it is possible to change the Port A baud
rate in the field using a personal computer and the Reciprocal Chiller Monitor software program.
The following diagram shows the chiller-to-network connections on Port B; communications
between the chiller and a personal computer are established on Port A.
Reciprocating MCB
Version 5.0
6
Communications to Two or More Chillers
The OPM provides a single communications port entry into the McQuay Reciprocating Chiller
Network. The OPM panel consists of a McQuay model 120 controller. The automation integrator
connects to Comm Port A, which is configured for RS-232, 9600 baud. Port A is the automation
control integrator's Open Protocol communications port. Comm Port B is a daisy chained, multidrop, 9600 baud, RS-485 proprietary McQuay protocol.
The main function of the OPM is to provide the network communications interface for up to 64
reciprocating chiller controllers.
The reciprocating chiller controller is factory mounted. The unit controller provides preprogrammed, pre-engineered and pre-tested stand-alone control. There is one controller for each
reciprocating chiller.
In addition to this hardware you must have McQuay's Open Protocol Simulator Monitor software
package for the reciprocating chiller. This software is used to configure, commission and
troubleshoot the McQuay communications system. The software contains diagnostic routines that
can be used to troubleshoot the McQuay network.
This software is MS-DOS compatible, to be used in all IBM PC's or 100% true compatibles.
The monitor software is installed in the IBM or compatible PC, and the PC is connected to the OPM
Port A.
Once the McQuay communication network has been commissioned and is totally functional, the
BAS vendor can disconnect the monitor software PC and connect a communicating device from the
BAS vendor’s network. The reciprocating chillers will continue to operate when communications
are lost. However, the network must be intact for read and write requests from the BAS vendor’s
communication device to be passed along to the reciprocating chillers.
When the BAS communicating device is connected to the OPM panel, the communications
configuration is as follows:
7
Version 5.0
Version 5.0
8
OPM MCB and Reciprocating MCB
OPM - Open Protocol Master Panel
There is only one memory location that can be read in the Open Protocol Master panel. It is used to
verify that the OPM is powered and communicating, and that the applications code is intact.
Open Protocol Master Status
0-254 = Program is running
255 =
9
$0400
Program is not running
Version 5.0
Input/Output Configuration (CR1 Chillers)
Analog Inputs
Input Number
Description
0
Evaporator Leaving Water Temperature
1
Circuit #1 Evaporator Pressure
2
Circuit #2 Evaporator Pressure
3
Circuit #1 Condenser Pressure
4
Circuit #2 Condenser Pressure
5
Voltage Ratio
6
Evaporator Leaving Water Reset
7
4 - 20 mA Demand Limit
8
Evaporator Entering Water Temperature
9
Condenser Entering Water Temperature (water cooled units) / Outdoor Air
Temperature (air cooled units)
10
Condenser Leaving Water Temperature (water cooled units; not used in air
cooled units)
11
Unit % RLA
12
Circuit #1 Suction Temperature
13
Circuit #2 Suction Temperature
14
Circuit #1 Liquid Line Temperature
15
Circuit #2 Liquid Line Temperature
Note:
The following analog inputs are optional; consult the local McQuay sales representative to
find out which sensors have been installed.
•
Condenser Entering and Leaving Water Temperatures
•
Evaporator Entering Water Temperature
•
Outdoor Air Temperature
•
Unit % RLA
•
Circuit #1 and #2 Suction Temperatures
•
Circuit #1 and #2 Liquid Line Temperatures
Digital Inputs
Input Number
Version 5.0
Description
0
Circuit #1 High Pressure Switch
1
Compressor #1 Oil Differential Switch
2
Compressor #1 Motor Protect Relay
3
Compressor #3 Oil Differential Switch
4
Compressor #3 Motor Protect Relay
10
Input Number
Description
5
System Shutdown Switch
6
Phase Voltage Switch
7
Circuit #1 Auto/Pumpdown & Stop
8
Circuit #2 High Pressure Switch
9
Compressor #2 Oil Differential Switch
10
Compressor #2 Motor Protect Relay
11
Compressor #4 Oil Differential Switch
12
Compressor #4 Motor Protect Relay
13
Remote Start/Stop
14
Chilled Water Flow
15
Circuit #2 Auto/Pumpdown & Stop
Digital Outputs
Input Number
11
Description
0
Alarm Output
1
Chilled Water Pump
2
Circuit #1 Solenoid
3
Circuit #2 Solenoid
4
Compressor #1 Enable
5
Compressor #2 Enable
6
Programmable
7
Programmable
8
Programmable
9
Programmable
10
Circuit #1 Condenser Fan 1
11
Circuit #1 Condenser Fan 2
12
Circuit #1 Condenser Fan 3
13
Circuit #2 Condenser Fan 1
14
Circuit #2 Condenser Fan 2
15
Circuit #3 Condenser Fan 3
Version 5.0
Input/Output Configuration (CR2 Chillers)
Analog Inputs
Input Number
0
Evaporator Leaving Water Temperature
1
Circuit #1 Evaporator Pressure
2
Circuit #2 Evaporator Pressure
3
Circuit #1 Condenser Pressure
4
Circuit #2 Condenser Pressure
5
Voltage Ratio
6
Evaporator Leaving Water Reset
7
4 - 20 mA Demand Limit
8
Evaporator Entering Water Temperature
9
Condenser Entering Water Temperature (water cooled units) / Outdoor Air
Temperature (air cooled units)
10
Condenser Leaving Water Temperature (water cooled units; not used in air
cooled units)
11
Unit % RLA
12
Circuit #1 Suction Temperature
13
Circuit #2 Suction Temperature
14
Circuit #1 Liquid Line Temperature
15
Circuit #2 Liquid Line Temperature
Note:
•
Description
The following analog inputs are optional; consult the local McQuay sales representative to
find out which sensors have been installed.
Unit % RLA
Digital Inputs
Input Number
Version 5.0
Description
0
Circuit #1 High Pressure Switch
1
Compressor #1 Oil Differential Switch
2
Compressor #1 Motor Protect Relay
3
(unused)
4
(unused)
5
System Shutdown Switch
6
Phase Voltage Switch
7
Circuit #1 Auto/Pumpdown & Stop
8
Circuit #2 High Pressure Switch
12
Input Number
Description
9
Compressor #2 Oil Differential Switch
10
Compressor #2 Motor Protect Relay
11
(unused)
12
(unused)
13
Remote Start/Stop
14
Chilled Water Flow
15
Circuit #2 Auto/Pumpdown & Stop
Digital Outputs
Input Number
13
Description
0
Alarm Output
1
Chilled Water Pump
2
Circuit #1 Solenoid
3
Circuit #2 Solenoid
4
Programmable
5
Programmable
6
Programmable
7
Programmable
8
Programmable
9
Programmable
10
Circuit #1 Condenser Fan 1
11
Circuit #1 Condenser Fan 2
12
Circuit #1 Condenser Fan 3
13
Circuit #2 Condenser Fan 1
14
Circuit #2 Condenser Fan 2
15
Circuit #3 Condenser Fan 3
Version 5.0
Input/Output Configuration (CR4 Chillers)
Analog Inputs
Input Number
Note:
•
Version 5.0
Description
0
Evaporator Leaving Water Temperature
1
Circuit #1 Evaporator Pressure
2
Circuit #2 Evaporator Pressure
3
Circuit #1 Condenser Pressure
4
Circuit #2 Condenser Pressure
5
Voltage Ratio
6
Evaporator Leaving Water Reset
7
4 - 20 mA Demand Limit
8
Evaporator Entering Water Temperature
9
Condenser Entering Water Temperature (water cooled units) / Outdoor Air
Temperature (air cooled units)
10
Condenser Leaving Water Temperature (water cooled units; not used in air
cooled units)
11
Unit % RLA
12
Circuit #1 Suction Temperature
13
Circuit #2 Suction Temperature
14
Circuit #1 Liquid Line Temperature
15
Circuit #2 Liquid Line Temperature
16
Circuit #3 Evaporator Pressure
17
Circuit #4 Evaporator Pressure
18
Circuit #3 Condenser Pressure
19
Circuit #4 Condenser Pressure
20
Circuit #3 Suction Temperature
21
Circuit #4 Suction Temperature
22
Circuit #3 Liquid Line Temperature
23
Circuit #4 Liquid Line Temperature
The following analog inputs are optional; consult the local McQuay sales representative to
find out which sensors have been installed.
Unit % RLA
14
Digital Inputs
Input Number
15
Description
0
Circuit #1 High Pressure Switch
1
Compressor #1 Oil Differential Switch
2
Compressor #1 Motor Protect Relay
3
Compressor #3 Oil Differential Switch
4
Compressor #3 Motor Protect Relay
5
System Shutdown Switch
6
Phase Voltage Switch
7
Circuit #1 Auto/Pumpdown & Stop
8
Circuit #2 High Pressure Switch
9
Compressor #2 Oil Differential Switch
10
Compressor #2 Motor Protect Relay
11
Compressor #4 Oil Differential Switch
12
Compressor #4 Motor Protect Relay
13
Remote Start/Stop
14
Chilled Water Flow
15
Circuit #2 Auto/Pumpdown & Stop
16
Circuit #3 High Pressure Switch
17
Circuit #3 Auto/Pumpdown & Stop
18
Circuit #4 High Pressure Switch
19
Circuit #4 Auto/Pumpdown & Stop
20
Compressor #1 Thermal Overload
21
Compressor #2 Thermal Overload
22
Compressor #3 Thermal Overload
23
Compressor #4 Thermal Overload
Version 5.0
Digital Outputs
Input Number
Version 5.0
Description
0
Alarm Output
1
Chilled Water Pump
2
Circuit #1 Solenoid
3
Programmable
4
Programmable
5
Circuit #2 Solenoid
6
Programmable
7
Programmable
8
Circuit #3 Solenoid
9
Programmable
10
Programmable
11
Circuit #4 Solenoid
12
Programmable
13
Programmable
14
Circuit #1 Condenser Fan 1
15
Circuit #1 Condenser Fan 2
16
Circuit #1 Condenser Fan 3
17
Circuit #2 Condenser Fan 1
18
Circuit #2 Condenser Fan 2
19
Circuit #2 Condenser Fan 3
20
Circuit #3 Condenser Fan 1
21
Circuit #3 Condenser Fan 2
22
Circuit #3 Condenser Fan 3
23
Circuit #4 Condenser Fan 1
24
Circuit #4 Condenser Fan 2
25
Circuit #4 Condenser Fan 3
16
Read Only Memory Locations (CR1 Chillers)
Variable Name
17
Address
Range
Units
Circuit #1 Condenser Approach
Temperature
$0497 (hi byte)
$0498 (lo byte)
0 to 263°F
°F * 10
Circuit #1 Condenser Pressure
$0467 (hi byte)
$0468 (lo byte)
0-450
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Condenser Pressure
$0822 (hi byte)
$0823 (lo byte)
0-450
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Evaporator Pressure
$0820 (hi byte)
$0821 (lo byte)
0-145
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Liquid Line Temperature
$0826 (hi byte)
$0827 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Conditions at Time of
Alarm: Suction Temperature
$0824 (hi byte)
$0825 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Current Alarm
$0831
1 - 23; 129 - 151
See alarm list
below
Circuit #1 Evaporator Pressure
$0463 (hi byte)
$0464 (lo byte)
0-145
PSI * 10
Circuit #1 Liquid Line
Temperature
$0479 (hi byte)
$047A (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Previous Alarm
$0833
1 - 23; 129 - 151
See alarm list
below
Circuit #1 Status
$0428
0-9
See status list
below
Circuit #1 Subcooling
Temperature
$049B (hi byte)
$049C (lo byte)
0 to 263°F
°F * 10
Circuit #1 Suction Temperature
$0475 (hi byte)
$0476 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Superheat Temperature $0493 (hi byte)
$0494 (lo byte)
0 to 263°F
°F * 10
Circuit #2 Condenser Approach
Temperature
$0499 (hi byte)
$049A (lo byte)
0 to 263°F
°F * 10
Circuit #2 Condenser Pressure
$0469 (hi byte)
$046A (lo byte)
0-450
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Condenser Pressure
$082A (hi byte)
$082B (lo byte)
0-450
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Evaporator Pressure
$0828 (hi byte)
$0829 (lo byte)
0-145
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Liquid Line Temperature
$082E (hi byte)
$082F (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Conditions at Time of
Alarm: Suction Temperature
$082C (hi byte)
$082D (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Current Alarm
$0832
1 - 23; 129 - 151
See alarm list
below
Circuit #2 Evaporator Pressure
$0465 (hi byte)
$0466 (lo byte)
0-145
PSI * 10
Version 5.0
Variable Name
Range
Units
Circuit #2 Liquid Line
Temperature
$047B (hi byte)
$047C (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Previous Alarm
$0834
1 - 23; 129 - 151
See alarm list
below
Circuit #2 Status
$0429
0-9
See status list
below
Circuit #2 Subcooling
Temperature
$049D (hi byte)
$049E (lo byte)
0 to 263°F
°F * 10
Circuit #2 Suction Temperature
$0477 (hi byte)
$0478 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Superheat Temperature $0495 (hi byte)
$0496 (lo byte)
0 to 263°F
°F * 10
Compressor #1 Operating Hours
$0862 (hi byte)
$0863 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Starts
$086A (hi byte)
$086B (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Operating Hours
$0864 (hi byte)
$0865 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Starts
$086C (hi byte)
$086D (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #3 Operating Hours
$0866 (hi byte)
$0867 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #3 Starts
$086E (hi byte)
$086F (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #4 Operating Hours
$0868 (hi byte)
$0869 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #4 Starts
$0870 (hi byte)
$0871 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Condenser Entering Water
Temperature
$0470 (hi byte)
$0471 (lo byte)
-40 to 263°F
(°F+100) * 10
Condenser Leaving Water
Temperature
$0472 (hi byte)
$0473 (lo byte)
-40 to 263°F
(°F+100) * 10
Evaporator Entering Water
Temperature
$046E (hi byte)
$046F (lo byte)
-40 to 263°F
(°F+100) * 10
Evaporator Leaving Water
Temperature
$0461 (hi byte)
$0462 (lo byte)
-40 to 263°F
(°F+100) * 10
OaT
$047D (hi byte)
$047E (lo byte)
-40 to 263°F
(°F+100) * 10
Stage of Cooling
$042B
0-8
Unit % RLA
$0474
0 - 100
Percent
Unit Status
$0427
0 - 14
See unit status
list below
Note:
Version 5.0
Address
For notes on alarms and alarm related data, temperatures, pressures, compressor operating
hours and starts, see Appendix A.
18
Circuit #1 Condenser Approach Temperature
$0497/$0498
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #1 Condenser Pressure
Measured pressure in circuit #1 condenser.
$0467/$0468
Circuit #1 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #1 alarm occurrence.
$0822/$0823
Circuit #1 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #1 alarm occurrence.
$0820/$0821
Circuit #1 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #1 liquid line at time of alarm occurrence.
$0826/$0827
Circuit #1 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #1 suction line at time of alarm occurrence.
$0824/$0825
Circuit #1 Current Alarm
$0831
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Motor Protect
8
136
Comp3 Motor Protect
9
137
Comp2 Motor Protect
10
138
Comp1 Motor Protect
11
139
Comp4 Low Oil Pressure
12
140
Comp3 Low Oil Pressure
13
141
Comp2 Low Oil Pressure
14
142
Comp1 Low Oil Pressure
15
143
High Cond Pressure
16
144
Mech. High Pressure
17
145
Bad Evap Pressure Sensor
18
146
Bad Cond Pressure Sensor
19
147
Bad Phase/Volts
20
148
Chilled Water Freeze Protect
21
149
Bad Voltage Ratio Sensor
22
150
Bad Evap Lvg T Sensor
23
151
A value of zero indicates "no alarm."
Circuit #1 Evaporator Pressure
Measured pressure in circuit #1 evaporator.
19
$0463/$0464
Version 5.0
Circuit #1 Liquid Line Temperature
$0479/$047A
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Circuit #1 Previous Alarm
See list for circuit #1 Current Alarm, above.
$0833
Circuit #1 Status
Defined values:
$0428
0=
Off, S-1 Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Pump Down
7=
Pump Down
8=
Wait For Cooling Pressure
9=
Cooling
Circuit #1 Subcooling Temperature
$049B/$049C
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #1 Suction Temperature
$0475/$0476
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #1 Superheat Temperature
$0493/$0494
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
Circuit #2 Condenser Approach Temperature
$0499/$049A
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #2 Condenser Pressure
Measured pressure in circuit #2 condenser.
$0469/$046A
Circuit #2 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #2 alarm occurrence.
$082A/$082B
Circuit #2 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #2 alarm occurrence.
$0828/$0829
Circuit #2 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #2 liquid line at time of alarm occurrence.
$082E/$082F
Circuit #2 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #2 suction line at time of alarm occurrence.
$082C/$082D
Circuit #2 Current Alarm
Version 5.0
$0832
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
20
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Motor Protect
8
136
Comp3 Motor Protect
9
137
Comp2 Motor Protect
10
138
Comp1 Motor Protect
11
139
Comp4 Low Oil Pressure
12
140
Comp3 Low Oil Pressure
13
141
Comp2 Low Oil Pressure
14
142
Comp1 Low Oil Pressure
15
143
High Cond Pressure
16
144
Mech. High Pressure
17
145
Bad Evap Pressure Sensor
18
146
Bad Cond Pressure Sensor
19
147
Bad Phase/Volts
20
148
Chilled Water Freeze Protect
21
149
Bad Voltage Ratio Sensor
22
150
Bad Evap Lvg T Sensor
23
151
A value of zero indicates "no alarm."
Circuit #2 Evaporator Pressure
Measured pressure in circuit #2 evaporator.
$0465/$0466
Circuit #2 Liquid Line Temperature
$047B/$047C
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Circuit #2 Previous Alarm
See list for circuit #2 Current Alarm, above.
21
$0834
Version 5.0
Circuit #2 Status
Defined values:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Pump Down
7=
Pump Down
8=
Wait For Cooling Pressure
9=
Cooling
$0429
Circuit #2 Subcooling Temperature
$049D/$049E
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #2 Suction Temperature
$0477/$0478
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #2 Superheat Temperature
$0495/$0496
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
Compressor #1 Operating Hours
Cumulative total of operating hours for compressor #1.
Compressor #1 Starts
Running total of starts for compressor #1.
Compressor #2 Operating Hours
Cumulative total of operating hours for compressor #2.
Compressor #2 Starts
Running total of starts for compressor #2.
$0862/$0863
$086A/$086B
$0864/$0865
$086C/$086D
Compressor #3 Operating Hours
Cumulative total of operating hours for compressor #3.
$0866/$0867
Compressor #3 Starts
Running total of starts for compressor #3.
$086E/$086F
Compressor #4 Operating Hours
Cumulative total of operating hours for compressor #4.
$0868/$0869
Compressor #4 Starts
Running total of starts for compressor #4.
$0870/$0871
Condenser Entering Water Temperature
$0470/$0471
This location contains the temperature, in °F, of water entering the condenser. (Applies to water
cooled units only.)
Condenser Leaving Water Temperature
$0472/$0473
This location contains the temperature, in °F, of water leaving the condenser. (Applies to water
cooled units only.)
Evaporator Entering Water Temperature
$046E/$046F
This location contains the temperature, in °F, of the chilled water entering the evaporator.
Version 5.0
22
Evaporator Leaving Water Temperature
$0461/$0462
This location contains the temperature, in °F, of the chilled water leaving the evaporator.
OAT
This location contains the Outdoor Air Temperature.
Stage of Cooling
Stage of cooling capacity at which the chiller is currently operating.
$047D/$047E
$042B
Unit % RLA
$0474
This location contains the percentage of Rated Load Amps being drawn by the unit. If the input
from the transducer for % RLA drops below 0.1VDC, a value of 254 (decimal) will be placed in this
location, in order to differentiate between noise and low current draw.
Unit Status
Defined values:
23
0=
Off, Manual Setpoint
1=
Off, S-1 System Switch
2=
Off, Remote Communication
3=
Off, Remote Switch
4=
Off, Time Schedule
5=
Off, Alarm
6=
Off, Pump Down Switches
7=
Off, Ready to Start
8=
Starting
9=
Waiting For Flow
10 =
Waiting For Load
11 =
Cool Stage Up
12 =
Cool Stage Down
13 =
Cool Staging
14 =
Manual Cool Staging
$0427
Version 5.0
Read Only Memory Locations (CR2 Chillers)
Variable Name
Version 5.0
Address
Range
Units
Circuit #1 Condenser Approach
Temperature
$0497 (hi byte)
$0498 (lo byte)
0 to 263°F
°F * 10
Circuit #1 Condenser Pressure
$0467 (hi byte)
$0468 (lo byte)
0-450
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Condenser Pressure
$0822 (hi byte)
$0823 (lo byte)
0-450
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Evaporator Pressure
$0820 (hi byte)
$0821 (lo byte)
0-145
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Liquid Line Temperature
$0826 (hi byte)
$0827 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Conditions at Time of
Alarm: Suction Temperature
$0824 (hi byte)
$0825 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Current Alarm
$0831
1 - 23; 129 - 151
See alarm list
below
Circuit #1 Evaporator Pressure
$0463 (hi byte)
$0464 (lo byte)
0-145
PSI * 10
Circuit #1 Liquid Line
Temperature
$0479 (hi byte)
$047A (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Previous Alarm
$0833
1 - 26; 129 - 154
See alarm list
below
Circuit #1 Status
$0428
0 - 13
See status list
below
Circuit #1 Subcooling
Temperature
$049B (hi byte)
$049C (lo byte)
0 to 263°F
°F * 10
Circuit #1 Suction Temperature
$0475 (hi byte)
$0476 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Superheat Temperature $0493 (hi byte)
$0494 (lo byte)
0 to 263°F
°F * 10
Circuit #2 Condenser Approach
Temperature
$0499 (hi byte)
$049A (lo byte)
0 to 263°F
°F * 10
Circuit #2 Condenser Pressure
$0469 (hi byte)
$046A (lo byte)
0-450
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Condenser Pressure
$082A (hi byte)
$082B (lo byte)
0-450
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Evaporator Pressure
$0828 (hi byte)
$0829 (lo byte)
0-145
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Liquid Line Temperature
$082E (hi byte)
$082F (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Conditions at Time of
Alarm: Suction Temperature
$082C (hi byte)
$082D (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Current Alarm
$0832
1 - 26; 129 - 154
See alarm list
below
24
Variable Name
Range
Units
Circuit #2 Evaporator Pressure
$0465 (hi byte)
$0466 (lo byte)
0-145
PSI * 10
Circuit #2 Liquid Line
Temperature
$047B (hi byte)
$047C (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Previous Alarm
$0834
1 - 23; 129 - 151
See alarm list
below
Circuit #2 Status
$0429
0 - 13
See status list
below
Circuit #2 Subcooling
Temperature
$049D (hi byte)
$049E (lo byte)
0 to 263°F
°F * 10
Circuit #2 Suction Temperature
$0477 (hi byte)
$0478 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Superheat Temperature $0495 (hi byte)
$0496 (lo byte)
0 to 263°F
°F * 10
Compressor #1 Operating Hours
(High Speed)
$0862 (hi byte)
$0863 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Operating Hours
(Low Speed)
$09D7 (hi byte)
$09D8 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Starts (High
Speed)
$086A (hi byte)
$086B (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Starts (Low
Speed)
$09DF (hi byte)
$09E0 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Operating Hours
(High Speed)
$0864 (hi byte)
$0865 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Operating Hours
(Low Speed)
$09D9 (hi byte)
$09DA (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Starts (High
Speed)
$086C (hi byte)
$086D (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Starts (Low
Speed)
$09E1 (hi byte)
$09E2 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Condenser Entering Water
Temperature
$0470 (hi byte)
$0471 (lo byte)
-40 to 263°F
(°F+100) * 10
Condenser Leaving Water
Temperature
$0472 (hi byte)
$0473 (lo byte)
-40 to 263°F
(°F+100) * 10
Evaporator Entering Water
Temperature
$046E (hi byte)
$046F (lo byte)
-40 to 263°F
(°F+100) * 10
Evaporator Leaving Water
Temperature
$0461 (hi byte)
$0462 (lo byte)
-40 to 263°F
(°F+100) * 10
OAT
$047D (hi byte)
$047E (lo byte)
-40 to 263°F
(°F+100) * 10
Stage of Cooling
$042B
0-8
Unit % RLA
$0474
0 - 100
Percent
Unit Status
$0427
0 - 14
See unit status
list below
Note:
25
Address
For notes on alarms and alarm related data, temperatures, pressures, compressor operating
hours and starts, see Appendix A.
Version 5.0
Circuit #1 Condenser Approach Temperature
$0497/$0498
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #1 Condenser Pressure
Measured pressure in circuit # 1 condenser.
$0467/$0468
Circuit #1 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #1 alarm occurrence.
$0822/$0823
Circuit #1 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #1 alarm occurrence.
$0820/$0821
Circuit #1 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #1 liquid line at time of alarm occurrence.
$0826/$0827
Circuit #1 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #1 suction line at time of alarm occurrence.
$0824/$0825
Circuit #1 Current Alarm
Defined values for CR2-M1xx series:
$0831
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Motor Protect
8
136
Comp3 Motor Protect
9
137
Comp2 Motor Protect
10
138
Comp1 Motor Protect
11
139
Comp4 Low Oil Pressure
12
140
Comp3 Low Oil Pressure
13
141
Comp2 Low Oil Pressure
14
142
Comp1 Low Oil Pressure
15
143
High Cond Pressure
16
144
Mech. High Pressure
17
145
Bad Evap Pressure Sensor
18
146
Bad Cond Pressure Sensor
19
147
Bad Phase/Volts
20
148
Chilled Water Freeze Protect
21
149
Bad Voltage Ratio Sensor
22
150
Bad Evap Lvg T Sensor
23
151
Cleared
Active
Defined values for CR2-M2xx series:
Alarm Name
Version 5.0
26
Compressor Warning
128
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Low Evap Press: No Start
6
134
Failed Pre-Purge
7
135
Failed Low Ambient Start
8
136
Refrigerant Freeze Protect
9
137
Low Evap Pressure
10
138
Comp2 Bad Suction Temp
11
139
Comp1 Bad Suction Temp
12
140
Comp2 Motor Protect/Very Low Pressure
13
141
Comp1 Motor Protect/Very Low Pressure
14
142
Comp4 Low Oil Pressure
15
143
Comp3 Low Oil Pressure
16
144
Comp2 Low Oil Pressure
17
145
Comp1 Low Oil Pressure
18
146
High Cond Pressure
19
147
Mech. High Pressure
20
148
Bad Evap Pressure Sensor
21
149
Bad Cond Pressure Sensor
22
150
System Alarm/Bad Phase/Volts
23
151
Chilled Water Freeze Protect
24
152
Bad Voltage Ratio Sensor
25
153
Bad Evap Lvg T Sensor
26
154
A value of zero indicates "no alarm."
Circuit # 1 Evaporator Pressure
Measured pressure in circuit #1 evaporator.
$0463/$0464
Circuit #1 Liquid Line Temperature
$0479/$047A
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Circuit #1 Previous Alarm
See list for circuit #1 Current Alarm, above.
27
$0833
Version 5.0
Circuit #1 Status
Defined values for CR2-M1xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Wait For Cooling Pressure
10 =
Brine Start Cycling
11 =
Cooling
$0428
Defined values for CR2-M2xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Pre-Purge Cycle
10 =
Purge Cycle
11 =
Open Solenoid Valve
12 =
Low Ambient Start
13 =
Cooling
Circuit #1 Subcooling Temperature
$049B/$049C
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #1 Suction Temperature
$0475/$0476
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #1 Superheat Temperature
$0493/$0494
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
Circuit #2 Condenser Approach Temperature
$0499/$049B
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Version 5.0
28
Circuit #2 Condenser Pressure
Measured pressure in circuit #2 condenser.
$0469/$046A
Circuit #2 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #2 alarm occurrence.
$082A/$082B
Circuit #2 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #2 alarm occurrence.
$0828/$0829
Circuit #2 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #2 liquid line at time of alarm occurrence.
$082E/$082F
Circuit #2 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #2 suction line at time of alarm occurrence.
$082C/$082D
Circuit #2 Current Alarm
Defined values for CR2-M1xx series:
$0832
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Motor Protect
8
136
Comp3 Motor Protect
9
137
Comp2 Motor Protect
10
138
Comp1 Motor Protect
11
139
Comp4 Low Oil Pressure
12
140
Comp3 Low Oil Pressure
13
141
Comp2 Low Oil Pressure
14
142
Comp1 Low Oil Pressure
15
143
High Cond Pressure
16
144
Mech. High Pressure
17
145
Bad Evap Pressure Sensor
18
146
Bad Cond Pressure Sensor
19
147
Bad Phase/Volts
20
148
Chilled Water Freeze Protect
21
149
Bad Voltage Ratio Sensor
22
150
Bad Evap Lvg T Sensor
23
151
Alarm Name
Cleared
Active
Compressor Warning
128
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Defined values for CR2-M2xx series:
29
Version 5.0
Alarm Name
Cleared
Active
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Low Evap Press: No Start
6
134
Failed Pre-Purge
7
135
Failed Low Ambient Start
8
136
Refrigerant Freeze Protect
9
137
Low Evap Pressure
10
138
Comp2 Bad Suction Temp
11
139
Comp1 Bad Suction Temp
12
140
Comp2 Motor Protect/Very Low Pressure
13
141
Comp1 Motor Protect/Very Low Pressure
14
142
Comp4 Low Oil Pressure
15
143
Comp3 Low Oil Pressure
16
144
Comp2 Low Oil Pressure
17
145
Comp1 Low Oil Pressure
18
146
High Cond Pressure
19
147
Mech. High Pressure
20
148
Bad Evap Pressure Sensor
21
149
Bad Cond Pressure Sensor
22
150
System Alarm/Bad Phase/Volts
23
151
Chilled Water Freeze Protect
24
152
Bad Voltage Ratio Sensor
25
153
Bad Evap Lvg T Sensor
26
154
A value of zero indicates "no alarm."
Circuit #2 Evaporator Pressure
Measured pressure in circuit #2 evaporator.
$0465/$0466
Circuit #2 Liquid Line Temperature
$047B/$047C
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Version 5.0
Circuit #2 Previous Alarm
See list for circuit #2 Current Alarm, above.
$0834
Circuit #2 Status
Defined values for CR2-M1xx series:
$0429
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Wait For Cooling Pressure
30
10 =
Brine Start Cycling
11 =
Cooling
Defined values for CR2-M2xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Pre-Purge Cycle
10 =
Purge Cycle
11 =
Open Solenoid Valve
12 =
Low Ambient Start
13 =
Cooling
Circuit #2 Subcooling Temperature
$049D/$049E
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #2 Suction Temperature
$0477/$0478
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #2 Superheat Temperature
$0495/$0496
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
31
Compressor #1 Operating Hours (High Speed)
Cumulative total of high speed operating hours for compressor #1.
$0862/$0863
Compressor #1 Operating Hours (Low Speed)
Cumulative total of low speed operating hours for compressor #1.
$09D7/$09D8
Compressor #1 Starts (High Speed)
Running total of high speed starts for compressor #1.
$086A/$086B
Compressor #1 Starts (Low Speed)
Running total of low speed starts for compressor #1.
$09DF/$09E0
Compressor #2 Operating Hours (High Speed)
Cumulative total of high speed operating hours for compressor #2.
$0864/$0865
Compressor #2 Operating Hours (Low Speed)
Cumulative total of low speed operating hours for compressor #2.
$09D9/$09DA
Compressor #2 Starts (High Speed)
Running total of high speed starts for compressor #2.
$086C/$086D
Compressor #2 Starts (Low Speed)
Running total of low speed starts for compressor #2.
$09E1/$09E2
Version 5.0
Condenser Entering Water Temperature
$0470/$0471
This location contains the temperature, in °F, of water entering the condenser. (Applies to water
cooled units only.)
Condenser Leaving Water Temperature
$0472/$0473
This location contains the temperature, in °F, of water leaving the condenser. (Applies to water
cooled units only.)
Evaporator Entering Water Temperature
$046E/$046F
This location contains the temperature, in °F, of the chilled water entering the evaporator.
Evaporator Leaving Water Temperature
$0461/$0462
This location contains the temperature, in °F, of the chilled water leaving the evaporator.
OAT
This location contains the Outdoor Air Temperature.
$047D/$047E
Stage of Cooling
Stage of cooling capacity at which the chiller is currently operating.
Unit % RLA
$0474
This location contains the percentage of Rated Load Amps being drawn by the unit. If the input
from the transducer for % RLA drops below 0.1VDC, a value of 254 (decimal) will be placed in this
location, in order to differentiate between noise and low current draw.
Unit Status
Defined values:
Version 5.0
0=
Off, Manual Setpoint
1=
Off, S-1 System Switch
2=
Off, Remote Communication
3=
Off, Remote Switch
4=
Off, Time Schedule
5=
Off, Alarm
6=
Off, Pump Down Switches
7=
Off, Ready to Start
8=
Starting
9=
Waiting For Flow
10 =
Waiting For Load
11 =
Cool Stage Up
12 =
Cool Stage Down
13 =
Cool Staging
14 =
Manual Cool Staging
$0427
32
Read Only Memory Locations (CR4 Chillers)
Variable Name
33
Address
Range
Units
Circuit #1 Condenser Approach
Temperature
$0445 (hi byte)
$0446 (lo byte)
0 to 263°F
°F * 10
Circuit #1 Condenser Pressure
$0467 (hi byte)
$0468 (lo byte)
0-450
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Condenser Pressure
$0993 (hi byte)
$0994 (lo byte)
0-450
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Evaporator Pressure
$0991 (hi byte)
$0992 (lo byte)
0-145
PSI * 10
Circuit #1 Conditions at Time of
Alarm: Liquid Line Temperature
$0997 (hi byte)
$0998 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Conditions at Time of
Alarm: Suction Temperature
$0995 (hi byte)
$0996 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Current Alarm
$087C
1 - 30; 129 - 158
See alarm list
below
Circuit #1 Evaporator Pressure
$0463 (hi byte)
$0464 (lo byte)
0-145
PSI * 10
Circuit #1 Liquid Line
Temperature
$0479 (hi byte)
$047A (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Previous Alarm
$0880
1 - 27; 129 - 155
See alarm list
below
Circuit #1 Status
$042A
0 - 13
See status list
below
Circuit #1 Subcooling
Temperature
$0440 (hi byte)
$0441 (lo byte)
0 to 263°F
°F * 10
Circuit #1 Suction Temperature
$0475 (hi byte)
$0476 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #1 Superheat Temperature $04A7 (hi byte)
$04A8 (lo byte)
0 to 263°F
°F * 10
Circuit #2 Condenser Approach
Temperature
$0447 (hi byte)
$0448 (lo byte)
0 to 263°F
°F * 10
Circuit #2 Condenser Pressure
$0469 (hi byte)
$046A (lo byte)
0-450
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Condenser Pressure
$099B (hi byte)
$099C (lo byte)
0-450
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Evaporator Pressure
$0999 (hi byte)
$099A (lo byte)
0-145
PSI * 10
Circuit #2 Conditions at Time of
Alarm: Liquid Line Temperature
$099F (hi byte)
$09A0 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Conditions at Time of
Alarm: Suction Temperature
$099D (hi byte)
$099E (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Current Alarm
$087D
1 - 30; 129 - 158
See alarm list
below
Circuit #2 Evaporator Pressure
$0465 (hi byte)
$0466 (lo byte)
0-145
PSI * 10
Version 5.0
Variable Name
Version 5.0
Address
Range
Units
Circuit #2 Liquid Line
Temperature
$047B (hi byte)
$047C (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Previous Alarm
$0881
1 - 27; 129 - 155
See alarm list
below
Circuit #2 Status
$042D
0 - 13
See status list
below
Circuit #2 Subcooling
Temperature
$045E (hi byte)
$045F (lo byte)
0 to 263°F
°F * 10
Circuit #2 Suction Temperature
$0477 (hi byte)
$0478 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #2 Superheat Temperature $04A9 (hi byte)
$04AA (lo byte)
0 to 263°F
°F * 10
Circuit #3 Condenser Approach
Temperature
$0449 (hi byte)
$044A (lo byte)
0 to 263°F
°F * 10
Circuit #3 Condenser Pressure
$049B (hi byte)
$049C (lo byte)
0-450
PSI * 10
Circuit #3 Conditions at Time of
Alarm: Condenser Pressure
$09A3 (hi byte)
$09A4 (lo byte)
0-450
PSI * 10
Circuit #3 Conditions at Time of
Alarm: Evaporator Pressure
$09A1 (hi byte)
$09A2 (lo byte)
0-145
PSI * 10
Circuit #3 Conditions at Time of
Alarm: Liquid Line Temperature
$09A7 (hi byte)
$09A8 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #3 Conditions at Time of
Alarm: Suction Temperature
$09A5 (hi byte)
$09A6 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #3 Current Alarm
$087E
1 - 30; 129 - 158
See alarm list
below
Circuit #3 Evaporator Pressure
$0497 (hi byte)
$0498 (lo byte)
0-145
PSI * 10
Circuit #3 Liquid Line
Temperature
$04A3 (hi byte)
$04A4 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #3 Previous Alarm
$0882
1 - 27; 129 - 155
See alarm list
below
Circuit #3 Status
$042E
0 - 13
See status list
below
Circuit #3 Subcooling
Temperature
$04C7 (hi byte)
$04C8 (lo byte)
0 to 263°F
°F * 10
Circuit #3 Suction Temperature
$049F (hi byte)
$04A0 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #3 Superheat Temperature $04AB (hi byte)
$04AC (lo byte)
0 to 263°F
°F * 10
Circuit #4 Condenser Approach
Temperature
$044B (hi byte)
$044C (lo byte)
0 to 263°F
°F * 10
Circuit #4 Condenser Pressure
$049D (hi byte)
$049E (lo byte)
0-450
PSI * 10
Circuit #4 Conditions at Time of
Alarm: Condenser Pressure
$09AB (hi byte)
$09AC (lo byte)
0-450
PSI * 10
34
Variable Name
35
Address
Range
Units
Circuit #4 Conditions at Time of
Alarm: Evaporator Pressure
$09A9 (hi byte)
$09AA (lo byte)
0-145
PSI * 10
Circuit #4 Conditions at Time of
Alarm: Liquid Line Temperature
$09AF (hi byte)
$09B0 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #4 Conditions at Time of
Alarm: Suction Temperature
$09AD (hi byte)
$09AE (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #4 Current Alarm
$087F
1 - 30; 129 - 158
See alarm list
below
Circuit #4 Evaporator Pressure
$0499 (hi byte)
$049A (lo byte)
0-145
PSI * 10
Circuit #4 Liquid Line
Temperature
$04A5 (hi byte)
$04A6 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #4 Previous Alarm
$0883
1 - 27; 129 - 155
See alarm list
below
Circuit #4 Status
$042F
0 - 13
See status list
below
Circuit #4 Subcooling
Temperature
$04FD (hi byte)
$04FE (lo byte)
0 to 263°F
°F * 10
Circuit #4 Suction Temperature
$04A1 (hi byte)
$04A2 (lo byte)
-40 to 263°F
(°F+100) * 10
Circuit #4 Superheat Temperature $04AD (hi byte)
$04AE (lo byte)
0 to 263°F
°F * 10
Compressor #1 Operating Hours
(High Speed)
$0862 (hi byte)
$0863 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Operating Hours
(Low Speed)
$09D7 (hi byte)
$09D8 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Starts (High
Speed)
$086A (hi byte)
$086B (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #1 Starts (Low
Speed)
$09DF (hi byte)
$09E0 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Operating Hours
(High Speed)
$0864 (hi byte)
$0865 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Operating Hours
(Low Speed)
$09D9 (hi byte)
$09DA (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Starts (High
Speed)
$086C (hi byte)
$086D (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #2 Starts (Low
Speed)
$09E1 (hi byte)
$09E2 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #3 Operating Hours
(High Speed)
$0866 (hi byte)
$0867 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #3 Operating Hours
(Low Speed)
$09DB (hi byte)
$09DC (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #3 Starts (High
Speed)
$086E (hi byte)
$086F (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #3 Starts (Low
Speed)
$09E3 (hi byte)
$09E4 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Version 5.0
Variable Name
Address
Range
Units
Compressor #4 Operating Hours
(High Speed)
$0868 (hi byte)
$0869 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #4 Operating Hours
(Low Speed)
$09DD (hi byte)
$09DE (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #4 Starts (High
Speed)
$0870 (hi byte)
$0871 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Compressor #4 Starts (Low
Speed)
$09E5 (hi byte)
$09E6 (lo byte)
0 - 65279
(hi byte*256) +
lo byte
Condenser Entering Water
Temperature
$0470 (hi byte)
$0471 (lo byte)
-40 to 263°F
(°F+100) * 10
Condenser Leaving Water
Temperature
$0472 (hi byte)
$0473 (lo byte)
-40 to 263°F
(°F+100) * 10
Evaporator Entering Water
Temperature
$046E (hi byte)
$046F (lo byte)
-40 to 263°F
(°F+100) * 10
Evaporator Leaving Water
Temperature
$0461 (hi byte)
$0462 (lo byte)
-40 to 263°F
(°F+100) * 10
OAT
$047D (hi byte)
$047E (lo byte)
-40 to 263°F
(°F+100) * 10
Stage of Cooling
$042B
0-8
Unit % RLA
$0474
0 - 100
Percent
Unit Status
$0427
0 - 14
See unit status
list below
Note:
For notes on alarms and alarm related data, temperatures, pressures, compressor operating
hours and starts, see Appendix A.
Circuit #1 Condenser Approach Temperature
$0445/$0446
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #1 Condenser Pressure
Measured pressure in circuit #1 condenser.
$0467/$0468
Circuit #1 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #1 alarm occurrence.
$0993/$0994
Circuit #1 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #1 alarm occurrence.
$0991/$0992
Circuit #1 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #1 liquid line at time of alarm occurrence.
$0997/$0998
Circuit #1 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #1 suction line at time of alarm occurrence.
$0995/$0996
Circuit #1 Current Alarm
Defined values for CR4-M1xx series:
Version 5.0
$087C
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
36
Alarm Name
Cleared
Active
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Thermal Overload
8
136
Comp3 Thermal Overload
9
137
Comp2 Thermal Overload
10
138
Comp1 Thermal Overload
11
139
Comp4 Motor Protect
12
140
Comp3 Motor Protect
13
141
Comp2 Motor Protect
14
142
Comp1 Motor Protect
15
143
Comp4 Low Oil Pressure
16
144
Comp3 Low Oil Pressure
17
145
Comp2 Low Oil Pressure
18
146
Comp1 Low Oil Pressure
19
147
High Cond Pressure
20
148
Mech. High Pressure
21
149
Bad Evap Pressure Sensor
22
150
Bad Cond Pressure Sensor
23
151
Bad Phase/Volts
24
152
Chilled Water Freeze Protect
25
153
Bad Voltage Ratio Sensor
26
154
Bad Evap Lvg T Sensor
27
155
Defined values for CR4-M2xx series:
37
Alarm Name
Cleared
Active
Compressor Warning
128
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Low Evap Press: No Start
6
134
Failed Pre-Purge
7
135
Failed Low Ambient Start
8
136
Low Evap Pressure
9
137
Refrigerant Freeze Protect
10
138
Comp4 Bad Suction Temp Sensor/Thermal Overload
11
139
Comp3 Bad Suction Temp Sensor/Thermal Overload
12
140
Comp2 Bad Suction Temp Sensor/Thermal Overload
13
141
Version 5.0
Alarm Name
Cleared
Active
Comp1 Bad Suction Temp Sensor/Thermal Overload
14
142
Comp4 Motor Protect/Very Low Pressure
15
143
Comp3 Motor Protect/Very Low Pressure
16
144
Comp2 Motor Protect/Very Low Pressure
17
145
Comp1 Motor Protect/Very Low Pressure
18
146
Comp4 Low Oil Pressure
19
147
Comp3 Low Oil Pressure
20
148
Comp2 Low Oil Pressure
21
149
Comp1 Low Oil Pressure
22
150
High Cond Pressure
23
151
Mech. High Pressure
24
152
Bad Evap Pressure Sensor
25
153
Bad Cond Pressure Sensor
26
154
System Alarm/Bad Phase/Volts
27
155
Chilled Water Freeze Protect
28
156
Bad Voltage Ratio Sensor
29
157
Bad Evap Lvg T Sensor
30
158
A value of zero indicates "no alarm."
Circuit #1 Evaporator Pressure
Measured pressure in circuit #1 evaporator.
$0463/$0464
Circuit #1 Liquid Line Temperature
$0479/$047A
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Version 5.0
38
Circuit #1 Previous Alarm
See list for circuit #1 Current Alarm, above.
$0880
Circuit #1 Status
Defined values for CR4-M1xx series:
$042A
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Wait For Cooling Pressure
10 =
Brine Start Cycling
11 =
Cooling
Defined values for CR4-M2xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Pre-Purge Cycle
10 =
Purge Cycle
11 =
Open Solenoid Valve
12 =
Low Ambient Start
13 =
Cooling
Circuit #1 Subcooling Temperature
$0440/$0441
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #1 Suction Temperature
$0475/$0476
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #1 Superheat Temperature
$04A7/$04A8
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
39
Version 5.0
Circuit #2 Condenser Approach Temperature
$0447/$044B
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #2 Condenser Pressure
Measured pressure in circuit #2 condenser.
$0469/$046A
Circuit #2 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #2 alarm occurrence.
$099B/$099C
Circuit #2 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #2 alarm occurrence.
$0999/$099A
Circuit #2 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #2 liquid line at time of alarm occurrence.
$099F/$09A0
Circuit #2 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #2 suction line at time of alarm occurrence.
$099D/$099E
Circuit #2 Current Alarm
Defined values for CR4-M1xx series:
Version 5.0
$087D
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Thermal Overload
8
136
Comp3 Thermal Overload
9
137
Comp2 Thermal Overload
10
138
Comp1 Thermal Overload
11
139
Comp4 Motor Protect
12
140
Comp3 Motor Protect
13
141
Comp2 Motor Protect
14
142
Comp1 Motor Protect
15
143
Comp4 Low Oil Pressure
16
144
Comp3 Low Oil Pressure
17
145
Comp2 Low Oil Pressure
18
146
Comp1 Low Oil Pressure
19
147
High Cond Pressure
20
148
Mech. High Pressure
21
149
Bad Evap Pressure Sensor
22
150
Bad Cond Pressure Sensor
23
151
Bad Phase/Volts
24
152
Chilled Water Freeze Protect
25
153
40
Alarm Name
Cleared
Active
Bad Voltage Ratio Sensor
26
154
Bad Evap Lvg T Sensor
27
155
Defined values for CR4-M2xx series:
Alarm Name
Cleared
Active
Compressor Warning
128
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Low Evap Press: No Start
6
134
Failed Pre-Purge
7
135
Failed Low Ambient Start
8
136
Low Evap Pressure
9
137
Refrigerant Freeze Protect
10
138
Comp4 Bad Suction Temp Sensor/Thermal Overload
11
139
Comp3 Bad Suction Temp Sensor/Thermal Overload
12
140
Comp2 Bad Suction Temp Sensor/Thermal Overload
13
141
Comp1 Bad Suction Temp Sensor/Thermal Overload
14
142
Comp4 Motor Protect/Very Low Pressure
15
143
Comp3 Motor Protect/Very Low Pressure
16
144
Comp2 Motor Protect/Very Low Pressure
17
145
Comp1 Motor Protect/Very Low Pressure
18
146
Comp4 Low Oil Pressure
19
147
Comp3 Low Oil Pressure
20
148
Comp2 Low Oil Pressure
21
149
Comp1 Low Oil Pressure
22
150
High Cond Pressure
23
151
Mech. High Pressure
24
152
Bad Evap Pressure Sensor
25
153
Bad Cond Pressure Sensor
26
154
System Alarm/Bad Phase/Volts
27
155
Chilled Water Freeze Protect
28
156
Bad Voltage Ratio Sensor
29
157
Bad Evap Lvg T Sensor
30
158
A value of zero indicates "no alarm."
Circuit #2 Evaporator Pressure
Measured pressure in circuit #2 evaporator.
41
$0465/$0466
Version 5.0
Circuit #2 Liquid Line Temperature
$047B/$047C
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Circuit #2 Previous Alarm
See list for circuit #2 Current Alarm, above.
$0881
Circuit #2 Status
Defined values for CR4-M1xx series:
$042D
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Wait For Cooling Pressure
10 =
Brine Start Cycling
11 =
Cooling
Defined values for CR4-M2xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Pre-Purge Cycle
10 =
Purge Cycle
11 =
Open Solenoid Valve
12 =
Low Ambient Start
13 =
Cooling
Circuit #2 Subcooling Temperature
$045E/$045F
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #2 Suction Temperature
$0477/$0478
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #2 Superheat Temperature
$04A9/$04AA
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
Version 5.0
42
Circuit #3 Condenser Approach Temperature
$0449/$044A
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #3 Condenser Pressure
Measured pressure in circuit #3 condenser
$049B/$049C
Circuit #3 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #3 alarm occurrence.
$09A3/$09A4
Circuit #3 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #3 alarm occurrence.
$09A1/$09A2
Circuit #3 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #3 liquid line at time of alarm occurrence.
$09A7/$09A8
Circuit #3 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #3 suction line at time of alarm occurrence.
$09A5/$09A6
Circuit #3 Current Alarm
Defined values for CR4-M1xx series:
43
$087E
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Thermal Overload
8
136
Comp3 Thermal Overload
9
137
Comp2 Thermal Overload
10
138
Comp1 Thermal Overload
11
139
Comp4 Motor Protect
12
140
Comp3 Motor Protect
13
141
Comp2 Motor Protect
14
142
Comp1 Motor Protect
15
143
Comp4 Low Oil Pressure
16
144
Comp3 Low Oil Pressure
17
145
Comp2 Low Oil Pressure
18
146
Comp1 Low Oil Pressure
19
147
High Cond Pressure
20
148
Mech. High Pressure
21
149
Bad Evap Pressure Sensor
22
150
Bad Cond Pressure Sensor
23
151
Bad Phase/Volts
24
152
Chilled Water Freeze Protect
25
153
Bad Voltage Ratio Sensor
26
154
Version 5.0
Alarm Name
Cleared
Active
Bad Evap Lvg T Sensor
27
155
Defined values for CR4-M2xx series:
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Low Evap Press: No Start
6
134
Failed Pre-Purge
7
135
Failed Low Ambient Start
8
136
Low Evap Pressure
9
137
Refrigerant Freeze Protect
10
138
Comp4 Bad Suction Temp Sensor/Thermal Overload
11
139
Comp3 Bad Suction Temp Sensor/Thermal Overload
12
140
Comp2 Bad Suction Temp Sensor/Thermal Overload
13
141
Comp1 Bad Suction Temp Sensor/Thermal Overload
14
142
Comp4 Motor Protect/Very Low Pressure
15
143
Comp3 Motor Protect/Very Low Pressure
16
144
Comp2 Motor Protect/Very Low Pressure
17
145
Comp1 Motor Protect/Very Low Pressure
18
146
Comp4 Low Oil Pressure
19
147
Comp3 Low Oil Pressure
20
148
Comp2 Low Oil Pressure
21
149
Comp1 Low Oil Pressure
22
150
High Cond Pressure
23
151
Mech. High Pressure
24
152
Bad Evap Pressure Sensor
25
153
Bad Cond Pressure Sensor
26
154
System Alarm/Bad Phase/Volts
27
155
Chilled Water Freeze Protect
28
156
Bad Voltage Ratio Sensor
29
157
Bad Evap Lvg T Sensor
30
158
A value of zero indicates "no alarm."
Circuit #3 Evaporator Pressure
Measured pressure in circuit #3 evaporator.
$0497/$0498
Circuit #3 Liquid Line Temperature
$04A3/$04A4
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
Version 5.0
44
Circuit #3 Previous Alarm
See list for circuit #3 Current Alarm, above.
$0882
Circuit #3 Status
Defined values for CR4-M1xx series:
$042E
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Wait For Cooling Pressure
10 =
Brine Start Cycling
11 =
Cooling
Defined values for CR4-M2xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Pre-Purge Cycle
10 =
Purge Cycle
11 =
Open Solenoid Valve
12 =
Low Ambient Start
13 =
Cooling
Circuit #3 Subcooling Temperature
$04C7/$04C8
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #3 Suction Temperature
$049F/$04A0
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #3 Superheat Temperature
$04AB/$04AC
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
45
Version 5.0
Circuit #4 Condenser Approach Temperature
$044B/$044C
This location contains the Condenser Approach Temperature in °F. The approach temperature is
calculated by subtracting the Condenser Leaving Water Temperature from the condenser refrigerant
temperature.
Circuit #4 Condenser Pressure
Measured pressure in circuit #4 condenser.
$049D/$049E
Circuit #4 Conditions at Time of Alarm: Condenser Pressure
Condenser pressure at time of circuit #4 alarm occurrence.
$09AB/$09AC
Circuit #4 Conditions at Time of Alarm: Evaporator Pressure
Evaporator pressure at time of circuit #4 alarm occurrence.
$09A9/$09AA
Circuit #4 Conditions at Time of Alarm: Liquid Line Temperature
Measured temperature in circuit #4 liquid line at time of alarm occurrence.
$09AF/$09B0
Circuit #4 Conditions at Time of Alarm: Suction Temperature
Measured temperature in circuit #4 suction line at time of alarm occurrence.
$09AD/$09AE
Circuit #4 Current Alarm
Defined values for CR4-M1xx series:
Version 5.0
$087F
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Refrigerant Freeze Protect
6
134
Low Evap Pressure
7
135
Comp4 Thermal Overload
8
136
Comp3 Thermal Overload
9
137
Comp2 Thermal Overload
10
138
Comp1 Thermal Overload
11
139
Comp4 Motor Protect
12
140
Comp3 Motor Protect
13
141
Comp2 Motor Protect
14
142
Comp1 Motor Protect
15
143
Comp4 Low Oil Pressure
16
144
Comp3 Low Oil Pressure
17
145
Comp2 Low Oil Pressure
18
146
Comp1 Low Oil Pressure
19
147
High Cond Pressure
20
148
Mech. High Pressure
21
149
Bad Evap Pressure Sensor
22
150
Bad Cond Pressure Sensor
23
151
Bad Phase/Volts
24
152
Chilled Water Freeze Protect
25
153
Bad Voltage Ratio Sensor
26
154
46
Alarm Name
Cleared
Active
Bad Evap Lvg T Sensor
27
155
Defined values for CR4-M2xx series:
Alarm Name
Cleared
Active
Hi Condenser Pre-Alarm Hold Stage
1
129
Hi Condenser Pre-Alarm Stage Down
2
130
Freeze Refrigerant Pre-Alarm Stage Down
3
131
Loss Of Chilled Water Flow
4
132
No Pump Down
5
133
Low Evap Press: No Start
6
134
Failed Pre-Purge
7
135
Failed Low Ambient Start
8
136
Low Evap Pressure
9
137
Refrigerant Freeze Protect
10
138
Comp4 Bad Suction Temp Sensor/Thermal Overload
11
139
Comp3 Bad Suction Temp Sensor/Thermal Overload
12
140
Comp2 Bad Suction Temp Sensor/Thermal Overload
13
141
Comp1 Bad Suction Temp Sensor/Thermal Overload
14
142
Comp4 Motor Protect/Very Low Pressure
15
143
Comp3 Motor Protect/Very Low Pressure
16
144
Comp2 Motor Protect/Very Low Pressure
17
145
Comp1 Motor Protect/Very Low Pressure
18
146
Comp4 Low Oil Pressure
19
147
Comp3 Low Oil Pressure
20
148
Comp2 Low Oil Pressure
21
149
Comp1 Low Oil Pressure
22
150
High Cond Pressure
23
151
Mech. High Pressure
24
152
Bad Evap Pressure Sensor
25
153
Bad Cond Pressure Sensor
26
154
System Alarm/Bad Phase/Volts
27
155
Chilled Water Freeze Protect
28
156
Bad Voltage Ratio Sensor
29
157
Bad Evap Lvg T Sensor
30
158
A value of zero indicates "no alarm."
Circuit #4 Evaporator Pressure
Measured pressure in circuit #4 evaporator.
$0499/$049A
Circuit #4 Liquid Line Temperature
$04A5/$04A6
This location contains the temperature, in °F, of the liquid refrigerant entering the expansion valve.
47
Version 5.0
Circuit #4 Previous Alarm
See list for circuit #4 Current Alarm, above.
$0883
Circuit #4 Status
Defined values for CR4-M1xx series:
$042F
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Wait For Cooling Pressure
10 =
Brine Start Cycling
11 =
Cooling
Defined values for CR4-M2xx series:
0=
Off, S-1 System Switch
1=
Off, Manual Setpoint
2=
Off, Alarm
3=
Off, Pump Down Switch
4=
Off, Wait For Cycle
5=
Off, Ready to Start
6=
Start Cooling
7=
Start Pump Down
8=
Pump Down
9=
Pre-Purge Cycle
10 =
Purge Cycle
11 =
Open Solenoid Valve
12 =
Low Ambient Start
13 =
Cooling
Circuit #4 Subcooling Temperature
$04FD/$04FE
This location contains the Subcooling Temperature in °F. The subcooling temperature is calculated
by subtracting the Liquid Line Temperature from the condenser refrigerant temperature.
Circuit #4 Suction Temperature
$04A1/$04A2
This location contains the temperature, in °F, of the low-pressure vaporized refrigerant entering the
compressor.
Circuit #4 Superheat Temperature
$04AD/$04AE
This location contains the Superheat Temperature in °F. The superheat temperature is calculated by
subtracting the evaporator refrigerant temperature from the Suction Temperature.
Compressor #1 Operating Hours (High Speed)
Cumulative total of high speed operating hours for compressor #1.
Version 5.0
$0862/$0863
48
Compressor #1 Operating Hours (Low Speed)
Cumulative total of low speed operating hours for compressor #1.
$09D7/$09D8
Compressor #1 Starts (High Speed)
Running total of high speed starts for compressor #1.
$086A/$086B
Compressor #1 Starts (Low Speed)
Running total of low speed starts for compressor #1.
$09DF/$09E0
Compressor #2 Operating Hours (High Speed)
Cumulative total of high speed operating hours for compressor #2.
$0864/$0865
Compressor #2 Operating Hours (Low Speed)
Cumulative total of low speed operating hours for compressor #2.
$09D9/$09DA
Compressor #2 Starts (High Speed)
Running total of high speed starts for compressor #2.
$086C/$086D
Compressor #2 Starts (Low Speed)
Running total of low speed starts for compressor #2.
$09E1/$09E2
Compressor #3 Operating Hours (High Speed)
Cumulative total of high speed operating hours for compressor #3.
$0866/$0867
Compressor #3 Operating Hours (Low Speed)
Cumulative total of low speed operating hours for compressor #3.
$09DB/$09DC
Compressor #3 Starts (High Speed)
Running total of high speed starts for compressor #3.
$086E/$086F
Compressor #3 Starts (Low Speed)
Running total of low speed starts for compressor #3.
$09E3/$09E4
Compressor #4 Operating Hours (High Speed)
Cumulative total of high speed operating hours for compressor #4.
$0868/$0869
Compressor #4 Operating Hours (Low Speed)
Cumulative total of low speed operating hours for compressor #4.
$09DD/$09DE
Compressor #4 Starts (High Speed)
Running total of high speed starts for compressor #4.
$0870/$0871
Compressor #4 Starts (Low Speed)
Running total of low speed starts for compressor #4.
$09E5/$09E6
Condenser Entering Water Temperature
$0470/$0471
This location contains the temperature, in °F, of water entering the condenser. (Applies to water
cooled units only.)
Condenser Leaving Water Temperature
$0472/$0473
This location contains the temperature, in °F, of water leaving the condenser. (Applies to water
cooled units only.)
Evaporator Entering Water Temperature
$046E/$046F
This location contains the temperature, in °F, of the chilled water entering the evaporator.
Evaporator Leaving Water Temperature
$0461/$0462
This location contains the temperature, in °F, of the chilled water leaving the evaporator.
OAT
This location contains the Outdoor Air Temperature.
$047D/$047E
Stage of Cooling
Stage of cooling capacity at which the chiller is currently operating.
49
Version 5.0
Unit % RLA
$0474
This location contains the percentage of Rated Load Amps being drawn by the unit. If the input
from the transducer for % RLA drops below 0.1VDC, a value of 254 (decimal) will be placed in this
location, in order to differentiate between noise and low current draw.
Unit Status
Defined values:
Version 5.0
0=
Off, Manual Setpoint
1=
Off, S-1 System Switch
2=
Off, Remote Communication
3=
Off, Remote Switch
4=
Off, Time Schedule
5=
Off, Alarm
6=
Off, Pump Down Switches
7=
Off, Ready to Start
8=
Starting
9=
Waiting For Flow
10 =
Waiting For Load
11 =
Cool Stage Up
12 =
Cool Stage Down
13 =
Cool Staging
14 =
Manual Cool Staging
$0427
50
Read and Write Memory Locations
Memory locations common to all types of chillers - CR1, CR2, and CR4
Variable Name
Address
Range
Units
Network Command
$044F
0-1
0 = Enable
1 = Disable
Network Demand Limit
$044D
0 - 100%
Percent
Network Evaporator Leaving Chilled Water
Temperature Reset
$044E
0 - 100%
Percent
Network Command
$044F
The Network Command is a way to disable the chiller through the Open Protocol interface. If all
other enable/disable features are in the "enabled" position, writing a "1" to the Network Command
memory location will disable the chiller. If any of the enable/disable features is in the "disabled"
position, the Network Command will have no effect. The memory for Network Command is a RAM
location that, upon loss and subsequent restoration of power, is initialized to "Enable."
Network Demand Limit
$044D
The chiller can be Demand Limited two ways - either by a hardwired 4 - 20 mA signal or by network
communications. Here is the formula:
[
]
 ( C − 1) × ( % S + % N ) + 50 

C−
100


Where: C = Number of cooling stages
S = 4 - 20 mA range in percent
N = Network range in percent
Example 1:
If there are eight cooling stages, and "50" has been written to the Network Demand Limit. (No
external 4 - 20 mA signal is wired).
[
]
 ( 8 − 1) × ( 0 + 50) + 50 

8− 
100


 [ 7 × 50] + 50 
8− 
 = 4 stages Maximum Limit
100


Example 2:
If there are eight cooling stages, the input from the 4 - 20 signal is 8 mA and the Network Demand
Limit is zero.
[
] 
 ( 8 − 1) × ( 25 + 0) + 50
8− 
100


 [ 7 × 25] + 50 
8− 
 = 6 stages Maximum Limit
100


51
Version 5.0
Network Evaporator Leaving Chilled Water Temperature Reset
$044E
This location contains the percentage of chilled water temperature reset to be performed when
Network Chilled Water Reset is selected as the Reset Option Setpoint.
Memory locations applicable only to CR1 and CR2 chillers
Variable Name
Address
Range
Units
Clear Circuit #1 Alarm
$091A
0-1
Clear Circuit #2 Alarm
$091B
0-1
Evaporator Entering Water Temperature Setpoint
$090D
30 - 160
(15°F 80°F)
°F * 2
Evaporator Leaving Water Temperature Setpoint
$0905
20 - 160
(10°F 80°F)
°F * 2
Maximum Chilled Water Reset Setpoint
$090C
0 - 90
(0°F 45°F)
°F * 2
Reset Option Setpoint
$090B
0-4
Clear Circuit #1 Alarm
1 = Clear Active Alarm
0 = Do Nothing
$091A
Memory location will change to zero when alarm is cleared.
Clear Circuit #2 Alarm
1 = Clear Active Alarm
0 = Do Nothing
$091B
Memory location will change to zero when alarm is cleared.
Evaporator Entering Water Temperature Setpoint
$090D
Temperature setpoints are not stored as direct representations of a temperature. They are stored as
temperature * 2. This will in effect allow temperatures to be specified in 0.5°F increments.
Example: 54.5°F is stored as 109 decimal.
Default value of Evaporator Entering Water Temperature Setpoint is 108 (54°F).
Version 5.0
Evaporator Leaving Water Temperature Setpoint
Default value of Evaporator Leaving Water Temperature Setpoint is 88 (44°F).
$0905
Maximum Chilled Water Reset Setpoint
Default value of Maximum Chilled Water Reset Setpoint is 20 (10°F).
$090C
Reset Option Setpoint
Possible values:
$090B
0=
No Chilled Water Reset (default)
1=
Return Chilled Water Reset (see I&M)
2=
4 - 20 mA Chilled Water Reset
3=
Network Chilled Water Reset
4=
Ice Chilled Water Reset (see I&M)
52
To reset from a hardwired 4 - 20 mA signal, write "2" to $090B. The chilled water supply
temperature will then be controlled from a range of 44°F (Evaporator Leaving Water Setpoint) to
54°F [Maximum Chilled Water Temperature Reset Setpoint (10°F) plus the Evaporator Leaving
Water Temperature Setpoint (44°F)]. At 4 mA or below, the temperature setpoint will be 44°F. At
20mA, the temperature setpoint will be 54°F.
To reset through communication, write "3" to $090B. The chilled water supply temperature will then
be controlled from a range of 44°F (Evaporator Leaving Water Setpoint) to 54°F [Maximum Chilled
Water Temperature Reset (10°F) + Evaporator Leaving Water Temperature Setpoint (44°F)]. You
may write 0 through 100 (% reset) to the Network Evaporator Leaving Reset. If you write a "0," the
temperature setpoint will be 44°F. If you write a "100," the temperature setpoint will be 54°F.
Memory locations applicable only to CR4 chillers
Variable Name
Address
Range
Units
Clear Circuit #1 Alarm
$097F
0-1
Clear Circuit #2 Alarm
$0980
0-1
Clear Circuit #3 Alarm
$0981
0-1
Clear Circuit #4 Alarm
$0982
0-1
Evaporator Entering Water Temperature Setpoint
$091C
30 - 160
(15°F 80°F)
°F * 2
Evaporator Leaving Water Temperature Setpoint
$0909
20 - 160
(10°F 80°F)
°F * 2
Maximum Chilled Water Reset Setpoint
$091B
0 - 90
(0°F 45°F)
°F * 2
Reset Option Setpoint
$091A
0-4
Clear Circuit #1 Alarm
1 = Clear Active Alarm
0 = Do Nothing
$097F
Memory location will change to zero when alarm is cleared.
Clear Circuit #2 Alarm
1 = Clear Active Alarm
0 = Do Nothing
$0980
Memory location will change to zero when alarm is cleared.
Clear Circuit #3 Alarm
1 = Clear Active Alarm
0 = Do Nothing
$0981
Memory location will change to zero when alarm is cleared.
Clear Circuit #4 Alarm
1 = Clear Active Alarm
0 = Do Nothing
$0982
Memory location will change to zero when alarm is cleared.
Evaporator Entering Water Temperature Setpoint
$091C
Temperature setpoints are not stored as direct representations of a temperature. They are stored as
temperature * 2. This will in effect allow temperatures to be specified in 0.5°F increments.
Example: 54.5°F is stored as 109 decimal.
53
Version 5.0
Default value of Evaporator Entering Water Temperature Setpoint is 108 (54°F).
Evaporator Leaving Water Temperature Setpoint
Default value of Evaporator Leaving Water Temperature Setpoint is 88 (44°F).
$0909
Maximum Chilled Water Reset Setpoint
Default value of Maximum Chilled Water Reset Setpoint is 20 (10°F).
$091B
Reset Option Setpoint
Possible values:
$091A
0=
No Chilled Water Reset (default)
1=
Return Chilled Water Reset (see I&M)
2=
4 - 20 mA Chilled Water Reset
3=
Network Chilled Water Reset
4=
Ice Chilled Water Reset (see I&M)
To reset from a hardwired 4 - 20 mA signal, write "2" to $091A. The chilled water supply
temperature will then be controlled from a range of 44°F (Evaporator Leaving Water Setpoint) to
54°F [Maximum Chilled Water Temperature Reset Setpoint (10°F) plus the Evaporator Leaving
Water Temperature Setpoint (44°F)]. At 4 mA or below, the temperature setpoint will be 44°F. At
20 mA the temperature setpoint will be 54°F.
To reset through communication, write "3" to $091A. The chilled water supply temperature will
then be controlled from a range of 44°F (Evaporator Leaving Water Setpoint) to 54°F [Maximum
Chilled Water Temperature Reset (10°F) + Evaporator Leaving Water Temperature Setpoint (44°F)].
You may write 0 through 100 (% reset) to the Network Evaporator Leaving Reset. If you write a
"0," the temperature setpoint will be 44°F. If you write a "100," the temperature setpoint will be
54°F.
Version 5.0
54
Reciprocating Chiller Simulator Package
Required Development Testing Tools
To develop and test an Open Protocol interface for the reciprocating chillers, the following is
required.
1. McQuay "Open Protocol Data Communications" document (version 1.3 dated Nov. 23, 1992 or
latest update).
2. McQuay Open Protocol Hardware Simulators Package includes:
(1) Model 250
(2) Model 125's
(1) Model 120
(1) Power supply with power cord and adapter cables.
(1) RS-232 Communications Cable package
(1) RS-485 Communication Cable package
3. Open Protocol Simulator Monitor software for the reciprocating chiller (P/N 950451-010)
4. Monitor Program Users Manual.
Setup of Hardware for Testing
One setup that is particularly helpful for proving out an Open Protocol interface is shown below. In
this arrangement, the Open Protocol interface is operational on Port A and the McQuay Monitor
program is operational on Port B.
Level 1
AWR
A
TCC
Comm.
Device
B (9600 Baud)
Level 2
"Monitor"
Software
The procedure for setting up this network arrangement is as follows:
55
Version 5.0
1.
2.
3.
4.
5.
6.
7.
Install the Open Protocol Simulator Monitor software on your PC. To install, simply insert the
diskette into one of your floppy drives and type "install." The install program will prompt you
through its installation.
Set the hex address switches on the Model 250 controller to Hi = F, and Lo = F. (This forces
Port A to 1200 Baud TTY and Port B to 9600 Baud TTY.)
Connect the RS-232 communications cable to Port B on the 250 controller.
Power the 250 controller.
Invoke the monitor program by typing "Run" at the DOS command prompt.
Establish communications with the controller (monitor program should connect at 9600 baud).
See the Monitor Program Users Manual for more details on using the monitor program.
Download to the controller the chiller simulator control code. The options for this simulator
code are:
"ARE12BO0.COD" - For Group 1 chillers
"CR215AO0.COD" - For Group 2 CR2 Chillers
"CR415AO0.COD" - For Group 3 CR4 Chillers
Note the download procedure may prompt you that port configurations are being changed; this is
O.K. Press <Enter> to continue. Also note that the controller is assumed to have all password
memory locations set to F.
When download is completed, restart the controller as prompted by the monitor program. The
monitor program should prompt "restart successful." De-power the controller and set the hex
address switches to Hi = 0 and Lo = 1. Re-power the controller and establish communications
with the monitor program.
8.
The simulator code by default has Port A set to 9600 baud TTY and Port B set to 9600 Baud
TTY. The TCC device should now be able to communicate at 9600 baud on Port A and Port B.
Select the chiller "WHR4I" as a start since, because this chiller has four compressors, it contains
nearly all the Open Protocol data points.
With both ports communicating, it is possible to read and write memory locations
simultaneously through the monitor program on Port B and TTC device on Port B.
The testing method should read every memory location from the TTC device and make sure it
agrees with the McQuay Monitor program screens. Most of the Open Protocol memory
locations are found on screens 1, 2, and 3 of the chiller being tested. For sample printouts of the
various screens available in the monitor program, see Appendix B.
If you wish to change the type of chiller being tested, go to Page 4 of any chiller selection and
change the "Unit Configuration" to the unit desired. Then select the corresponding unit from the
Unit Selection screen.
Version 5.0
56
Appendix A - Notes on Read Only Memory Locations
Note on Alarms and Alarm Related Data
Individual alarms are represented as non-zero values in the memory locations as described in
previous chapters. Values less than 128 decimal represent cleared alarms and values greater than
128 are active alarms. Zero indicates no alarm.
Note on Temperatures
To read temperature, you must read two separate bytes of information from the controller. We
designate these as a high byte and a low byte. The high and low bytes are the controller’s
representation of a decimal number from 0-65535. To convert them to decimal, multiply the high
byte by 256 and add the low byte to the result.
If the temperature is a calculated temperature (condenser approach, subcooling or superheat):
convert the decimal value to degrees Fahrenheit by dividing it by 10, or,
convert the decimal value to degrees Centigrade by dividing it by 10, subtracting 32 and multiplying
the result by 5/9ths.
high byte * 256 + low byte = X
( X / 10 ) = Temperature in °F, or,
(( X / 10) - 32) * 5/9 = Temperature in °C
Example:
high byte = 3
low byte = 86
3 * 256 + 86 = 854
(854 / 10) = 85.4°F, or,
((854 /10) -32) * 5/9 = 29.7°C
If the temperature is a sensed temperature:
convert the decimal value to degrees Fahrenheit by dividing it by 10 and subtracting 100 from the
result, or,
convert the decimal value to degrees Centigrade by dividing it by 10, subtracting 132 and
multiplying the result by 5/9ths.
Example:
high byte * 256 + low byte = X
( X / 10 ) - 100 = Temperature in °F, or,
(( X / 10) - 132) * 5/9 = Temperature in °C
Example:
high byte = 7
low byte = 62
7 * 256 + 62 = 1854
(1854 / 10) - 100 = 85.4°F, or,
((1854 /10) -132) * 5/9 = 29.7°C
57
Version 5.0
Note on Pressures
Reading a pressure also requires reading two separate bytes of information from the controller. We
designate these the same as for temperature, a high and low byte. To convert them to decimal,
multiply the high byte by 256 and add the low byte to the result. Divide this decimal number by 10
to find pressure in PSI or multiply it by .689 to find the pressure in KPA.
high byte * 256 + low byte = X
(X) / 10 = Pressure in PSI
(X) * 0.689 = Pressure in KPA
Example:
high byte = 3
low byte = 86
3 * 256 + 86 = 854
854 / 10 = 85.4 PSI
854 * 0.689 = 588 KPA
Note on Compressor Operating Hours and Starts
To read operating hours and compressor starts, you must again read two separate bytes of
information from the controller. We designate these the same as for temperature or pressure, a high
and low byte To convert these two bytes to decimal, multiply the high byte by 256 and add the low
byte to it. The resulting decimal number is the number of operating hours or compressor starts.
high byte * 256 + low byte = X
X = number of operating hours or compressor starts
Example:
high byte = 19
low byte = 233
19 * 256 + 233 = 5097 operating hours
Version 5.0
58
Appendix B - Monitor Screens
59
Version 5.0
Version 5.0
60
61
Version 5.0
Version 5.0
62
Appendix C - Chiller Models
GROUP 1 - CR1 Chillers
Water Cooled Chillers Manufactured in Cecchina, Italy
Model No.
No. Compressors
R22
R134a
WHR-045
2
Yes
Yes
WHR-055
2
Yes
Yes
WHR-065
2
Yes
Yes
WHR-075
2
Yes
Yes
WHR-085
2
Yes
Yes
WHR-100
2
Yes
Yes
Air Cooled Chillers Manufactured in Cecchina, Italy
Model No.
No. Compressors
R22
R134a
ALR-035
2
Yes
Yes
ALR-038
2
Yes
Yes
ALR-045
2
Yes
Yes
ALR-055
2
Yes
No
ALR-060
2
Yes
Yes
ALR-065
2
Yes
No
ALR-070
2
Yes
Yes
ALR-075
2
Yes
No
ALR-085
2
Yes
Yes
ALR-095
2
Yes
No
GROUP 2 - CR2 Chillers
Water Cooled Chillers Manufactured
in Cecchina, Italy
63
Model No.
No. Compressors
WHR-105
2
WHR-125
2
WHR-150
2
WHR-175
2
WHR-190
2
Version 5.0
Air Cooled Chillers Manufactured
in Cecchina, Italy
Model No.
No. Compressors
ALR-100
2
ALR-110
2
ALR-130
2
ALR-155
2
ALR-180
2
GROUP 3 - CR4 Chillers
Water Cooled Chillers Manufactured
in Cecchina, Italy
Model No.
No. Compressors
WHR-225
3
WHR-245
3
WHR-265
3
WHR-285
3
WHR-210
4
WHR-220
4
WHR-240
4
WHR-260
4
Air Cooled Chillers Manufactured
in Cecchina, Italy
Version 5.0
Model No.
No. Compressors
ALR-210
3
ALR-220
3
ALR-240
3
ALR-260
3
ALR-285
4
ALR-310
4
ALR-335
4
64
Glossary of Terms
BAS
Building Automation System
KPA
Kilopascals
OAT
Outdoor Air Temperature
OPM
Open Protocol Master
PSI
Pounds Per Square Inch
RLA
Rated Load Amps
65
Version 5.0
Index
—A—
—L—
Air cooled chillers, 11, 13, 15, 63, 64, 65
Analog inputs, 11, 13, 15
Automation integrator, 5, 6, 8
Liquid line, 15, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29,
31, 32, 34, 35, 36, 39, 40, 42, 43, 45, 46, 48, 49
—B—
Baud rates, 7, 8, 56, 57
Building automation system, 6, 8, 66
—C—
Chilled water reset, 6, 52, 53, 54, 55
Comm port, 7, 8, 56, 57
Communications protocols, 7, 8, 56
Compressor operating hours, 19, 23, 26, 32, 36, 37, 49,
50, 59
Compressor starts, 19, 23, 26, 32, 36, 37, 49, 50, 59
Condenser approach temperature, 18, 20, 21, 25, 27, 29,
34, 35, 37, 40, 43, 46, 58
Condenser entering water, 11, 13, 15, 19, 23, 26, 33, 37,
50
Condenser leaving water, 11, 13, 15, 19, 20, 21, 23, 26,
27, 29, 37, 40, 43, 46, 50
Condenser pressure, 11, 13, 15, 18, 20, 21, 25, 27, 29, 34,
36, 37, 40, 43, 46
Cooling stage, 19, 20, 22, 23, 26, 27, 28, 30, 33, 37, 38,
41, 44, 47, 50, 51
CR1 chillers, 5, 6, 11, 18, 52, 53, 63
CR2 chillers, 4, 5, 13, 25, 27, 28, 29, 30, 31, 32, 52, 53,
57, 63
CR4 chillers, 4, 5, 15, 34, 38, 39, 40, 41, 42, 43, 44, 45,
46, 47, 48, 49, 52, 54, 57, 65
Current alarm, 18, 20, 22, 25, 27, 28, 30, 31, 34, 35, 38,
39, 41, 42, 44, 45, 47, 48
—D—
Demand limitiing, 6, 11, 13, 15, 52
Digital inputs/outputs, 11, 12, 13, 14, 15, 16
—E—
Evaporator entering water, 11, 13, 15, 19, 23, 26, 33, 37,
50, 53, 54, 55
Evaporator leaving water, 11, 13, 15, 19, 23, 26, 33, 37,
52, 53, 54, 55
Evaporator pressure, 11, 13, 15, 18, 19, 21, 22, 25, 26,
28, 30, 34, 35, 36, 39, 40, 42, 43, 45, 46, 48
—G—
Group 1 chillers, 5, 57
Group 2 chillers, 4, 5, 57
Group 3 chillers, 4, 5, 57
—I—
—M—
Monitor software, 8, 56, 57
—N—
Network command, 6, 52
Network, Open Protocol, 7, 8
—O—
Open Protocol Master panel, 8, 10, 66
Open Protocol network, 7, 8
Outdoor air temperature, 19, 23, 26, 33, 37, 50, 66
—P—
Personal computer, 8, 56
Port, 7, 8, 56, 57
Previous alarm, 19, 26, 28, 31, 35, 36, 39, 42, 45, 48
—R—
Rated load amps, 11, 19, 24, 26, 33, 37, 50
Read/write requests, 4, 5, 6, 8, 10, 18, 25, 34, 52, 54, 55,
57, 58, 59
Relays, 11, 12, 13, 14, 16
Remote alarm clearing, 6
Remote start/stop, 6, 12, 14, 16
RLA, 11, 19, 24, 26, 33, 37, 50
—S—
Sensors, 20, 22, 27, 28, 30, 31, 38, 39, 41, 42, 44, 45, 47,
48
Software IDENT, 5, 6
Solenoids, 12, 14, 16, 17, 29, 40, 43, 46, 49
Stage of cooling, 19, 20, 22, 23, 26, 27, 28, 30, 33, 37,
38, 41, 44, 47, 50, 51
Status, 4, 10, 19, 21, 22, 24, 26, 28, 31, 33, 35, 36, 37, 39,
42, 45, 48, 50
Subcooling, 19, 21, 23, 26, 29, 32, 35, 36, 40, 43, 46, 49
Suction, 11, 15, 18, 19, 20, 21, 23, 25, 26, 27, 28, 29, 30,
31, 32, 34, 35, 36, 37, 39, 40, 42, 43, 44, 45, 46, 47,
48, 49
Superheat, 18, 19, 21, 23, 25, 26, 29, 32, 34, 35, 36, 40,
43, 46, 49
Switches, 11, 12, 13, 14, 15, 16, 21
—W—
Water cooled chillers, 11, 13, 15, 23, 50, 63, 65
IDENT, 5, 6
Integrator, automation, 5, 6, 8
Version 5.0
66
13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (763) 553-5330 (www.mcquay.com)