BACnet Points For Reversible Chillers NXW096, NXW360, NXW540 (PRODCWWE-06)

BACnet Points For Reversible Chillers NXW096, NXW360, NXW540 (PRODCWWE-06)
BACnet Points for Reversible Chiller Water-toWater Heat Pumps Utilizing the FX10 Controller
All volatile (Output) type points will revert to the uncommanded values after a power interruption.
These have no limit on the number of writes in a lifetime. The nonvolatile (Value) type points have their
values stored in flash memory and they retain their values through a power outage. These have a limited
life-time number of write cycles, about 2,000,000. Excessive writes to these will cause controller failure.
Depending on the type of BAS that you are using to integrate the controllers, you will either have an
uncommanded value of 254 or 255 for the multistate inputs, outputs and values. For the BAS systems
that show 254 as the uncommanded value, you will read/write a “0” for the “Off” command and “1” for
the “On” command. For the BAS that shows 255 you will read/write a “1” for the “Off” command and a “2”
for the “On” command.
Analog Inputs
Read/Write
Description
AI1 Source Frz 1
Read
Shows the temperature of the refrigerant entering the source side heat
exchanger for compressor 1.
AI2 Load Frz 1
Read
Shows the temperature of the refrigerant entering the load side heat
exchanger for compressor 1.
AI3 Enter Load Temp
Read
Shows the temperature of the water entering the load side heat
exchanger.
AI4 Leaving Load Temp
Read
Shows the temperature of the water leaving the load side heat
exchanger.
AI5 Enter Source Temp
Read
Shows the temperature of the water entering the source side heat
exchanger.
AI6 Leaving Source Temp
Read
Shows the temperature of the water leaving the source side heat
exchanger.
AI7 Source Frz Setpt
Read
Shows the low temperature limit of the source side heat exchanger.
AI8 Load Frz Setpt
Read
Shows the low temperature limit of the load side heat exchanger.
Read
Shows the commanded status of compressor 1. 1=Off, 2=On
AI10 Alarm Status Output
Read
Shows the commanded status of the alarm output.
AI11 Comp2 Status Output
Read
Shows the commanded status of compressor 2. 1=Off, 2=On
AI12 Source Frz 2
Read
Shows the refrigerant temperature entering the source side heat for
compressor 2.
AI13 Load Frz 2
Read
Shows the refrigerant temperature entering the load side heat for
compressor 2.
AI9
Comp1 Status Output
© 2013 The manufacturer has a policy of continual product research and development and reserves the right to change design and specifications without notice.
PRODCWWE-06-07-08-09
02/13
Page 1 of 4
1=Off, 2=On
BACNET POINTS FOR REVERSIBLE CHILLER WATER-TO-WATER HEAT PUMPS UTILIZING THE FX10 CONTROLLER
AI14 Alarms
Read
Analog Values
Read/Write
Shows a numeric value that can be related to the alarms table located
on the last page of this document.
Description
Warning: These are written in Flash memory and have about 2,000,000 write cycles. Should only
be written to by manual writes or through a scheduled writes, not by the automated reset
process. EXCESSIVE WRITES WILL CAUSE CONTROLLER FAILURE, THIS WILL NOT BE COVERED
UNDER WARRANTY!
AV1 Frz Setpt 1
Read/Write
Shows the high temp freeze limit
AV2 Frz Setpt 2
Read/Write
Allows for the low temp limit to be adjusted once the jumpers are
removed on the control board.
AV3 Compressor On Delay Read/Write
Multistate Inputs
Read/Write
Allows for the compressor on delay timer to be adjusted. Default is 90
seconds.
Description
Warning: If your uncommanded value is 254 then the numeric values listed below will be 1
less than what is described.
MI1 Mode of Operation
Read
Shows the current operating status of the heatpump.
1=Auto, 7=Shutdown
MI2 Compr 1 Cmd Status
Read
Shows the commanded status of compressor 1. 1=Off, 2=On
MI3 Compr 2 Cmd Status
Read
Shows the commanded status of compressor 2. 1=Off, 2=On
MI4 Rev Valve Status
Read
Shows the commanded position of the reversing valve.
1=Cooling, 2=Heating
MI5 Acc 1 Status
Read
Shows the current state of the ACC 1(X1) output. 1=Off, 2=On
MI6 Stage 1 Alarm
Read
Shows the current status of the compressor 1 alarm. 1=Off, 2=Alarm
MI7 Stage 2 Alarm
Read
Shows the current status of the compressor 2 alarm. 1=Off, 2=Alarm
MI8 Load Flow Switch
Read
Shows the current status of the load flow switch input.
1=Open, 2=Closed
MI9 Source Flow Switch
Read
Shows the current status of the source flow switch input.
1=Open, 2=Closed
© 2013 The manufacturer has a policy of continual product research and development and reserves the right to change design and specifications without notice.
PRODCWWE-06-07-08-09
02/13
Page 2 of 4
BACNET POINTS FOR REVERSIBLE CHILLER WATER-TO-WATER HEAT PUMPS UTILIZING THE FX10 CONTROLLER
Warning: With Lead/Lag enabled (factory default), and no compressors running, if there is a
command given to run a compressor whether a Y1 or Y2 call, the unit will start the
compressor that has been off the longest.
With Lead/Lag disabled and no compressors are running, a Y1 call will start compressor 1, a
Y2 call will start compressor 2. The control does not care which command it receives, it will
start the corresponding compressor.
Multistate Outputs
Read/Write
Description
Warning: If your uncommanded value is 254 then the numeric values listed below will be 1
less than what is described.
MO1 Compr 1 Cmd (Y1)
Write
Allows for network command equivalent of a thermostat 'Y1' call.
1=Off, 2=On
MO2 Compr 2 Cmd (Y2)
Write
Allows for network command equivalent of a thermostat 'Y2' call.
1=Off, 2=On
MO3 Rev Valve Cmd (B)
Write
Allows for network command equivalent of a thermostat 'B' call.
1=Cooling, 2=Heating
MO4 Alarm Reset
Write
Allows for network reset of manual reset alarms, must write to a 2 then
back to a 1 for reset to take effect.
MO5 nviEXPBO1
Write
Allows for network control of digital output 1 on the expansion board.
1=Off, 2=On
MO6 nviEXPO2
Write
Allows for network control of digital output 2 on the expansion board.
1=Off, 2=On
MO7 nviEXPO7
Write
Allows for network control of digital output 7 on the expansion board.
1=Off, 2=On
MO8 nviEXPO8
Write
Allows for network control of digital output 8 on the expansion board.
1=Off, 2=On
MO9 Emergency Override
Write
Allows for a network command to put the unit in emergency shutdown.
1=Auto, 2=Shutdown
© 2013 The manufacturer has a policy of continual product research and development and reserves the right to change design and specifications without notice.
PRODCWWE-06-07-08-09
02/13
Page 3 of 4
BACNET POINTS FOR REVERSIBLE CHILLER WATER-TO-WATER HEAT PUMPS UTILIZING THE FX10 CONTROLLER
PRODCWWE-06/07/08/09 Alarm Table
Description
#
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
No alarms
Load Flow Switch
Compressor 1 Low Suction Pressure
Source Low Temp Alarm Compressor 1
Source Predictive Freeze Alarm Compressor 1
Source Flow Switch
High Pressure On Compressor 1
Bad Source Sensor On Compressor 1
Bad Load Sensor On Compressor 1
Compressor 2 Low Suction Pressure
Source Low Temp Alarm Compressor 2
Bad Source Sensor On Compressor 2
Source Predictive Freeze Alarm Compressor 2
Bad Load Sensor On Compressor 2
High Pressure On Compressor 2
Compressor 1 Start Failure
Low Temp Cutoff on Compressor 1
Low Temp Cutoff on Compressor 2
Compressor 2 Start Failure
Load Low Temp Alarm Compressor 1
Load Predictive Freeze Alarm Compressor 1
Load Low Temp Alarm Compressor 2
Load Predictive Freeze Alarm Compressor 2
Compressor 1 Charge Loss
Compressor 2 Charge Loss
© 2013 The manufacturer has a policy of continual product research and development and reserves the right to change design and specifications without notice.
PRODCWWE-06-07-08-09
02/13
Page 4 of 4
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