21 ED 15121
Chiller Enable Output
Keypad Menu Path Main Menu_View/Set Unit_Status/Settings_Netwrk En SP=
This read only holding register indicates if operation of the chiller is disabled or enabled. If the chiller is disabled, it
cannot run. If it is enabled, it is allowed to run.
Data Type
Holding Register
Measurement Units Valid Range
RO Holding Register
2
Chiller state N/A
0=Disable
1=Enable
Chiller Enable Setpoint
Keypad Menu Path No Keypad Equivalent
This read/write holding register is used enable the chiller to run if operating conditions are satisfied, or disables the
chiller from running. The default is Null which will cause Disable to be used provided nothing else is writing to this
point. This register is ignored by the chiller application if Chiller Local/Remote is set to Local.
Data Type
Holding Register
Measurement Units Valid Range
RW Holding Register
9
Chiller State N/A
0=Disable
1=Enable
2=Null
Chiller Local/Remote
Keypad Menu Path No Keypad Equivalent
This read only holding register indicates whether the chiller is in local control or allowed to be controlled remotely over
the network. The value can only be changed locally. The values from the following variables are ignored in the chiller
application if this variable is set to Local (1):
• Chiller Enable Setpoint
• Chiller Mode Setpoint – Network
• Cool Setpoint Network
• Ice Setpoint Network
• Capacity Limit Setpoint
• Clear Alarm Network
Data Type
Holding Register
Measurement Units Valid Range
RO Holding Register
1
Mode N/A
0=Remote
1=Local
Chiller Location
Keypad Menu Path No Keypad Equivalent
These read/write holding registers provides a description of the location. If the location is changed via Modbus, the
change is written immediately to the unit controller. However, if the location is changed by an outside source (other
than Modbus), then change will not be available via Modbus until power is cycled.
Data Type
Holding Register
Measurement Units Valid Range
RW Holding Register
318-327
Location N/A
ASCII String up to 20
characters. The string
cannot contain “ or $
characters.
Chiller Mode Output
Keypad Menu Path Main Menu_View/Set Unit_Status/Settings_Netwrk Mode SP=
This read only holding register indicates the current operating mode of the chiller.
Data Type
Holding Register
Measurement Units Valid Range
RO Holding Register
11
HVAC mode N/A
1=Ice
2=Cool
3=Heat
4=Cool/Heat
Recovery
5=Defrost
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