OMM 1130 75
Chiller Mode
Applies to Integer 17 and Integer 19. Network Chiller Mode Set Point and Active Chiller Mode use the
same numbering scheme to represent ice mode or cool mode. The output representing the mode is shown
below for each protocol.
Mode LONworks BACnet Modbus
Heat 1 3 3
Cool 3 2 2
Ice 11 1 1
Any time the chiller is not in Ice mode, Cool mode will be assumed.
LON Chiller Run Mode
Applies to Integer 18. The LON Chiller Run Mode parameter indicates the unit state as follows:
State LONworks BACnet Modbus
Off 0 1 1
Run 2 3 3
Service 4 5 5
State = Off any time the state is not Run or Service
State = Run when the unit state is Auto
State = Service when the unit is in Test mode
Unit Identification
Integer 28 indicates the unit model type and refrigerant. For the WGZD with R-22, R407c, R410A and
TGZ with R134a, the refrigerant the output is 3.
Integer 29 indicates the unit language. For the WGZD the language can only be English, so output is 1.
Integer 30 indicates the software version and revision. The hundreds digit represents the version, and the
remaining part represents the revision letter.
Compressor Select
Compressor Select is used to select the compressor for which the associated parameters will be sent to the
BAS interface. The input should equal the number of the compressos for which data is desired. If a 0 is
sent from the BAS, this will also select compressor 1.
Timeclock Setting
The chiller time and date may be changed through the BAS interface. Time and date are updated by first
setting the values for the time and date inputs on the BAS. When the BAS sets digital index 12 high, the
time and date in the controller is set to the values supplied by the BAS. The values used are as follows:
Year: Integer # 35 (00 to 99)
Month: Integer # 36 (1 to 12)
Day of Month: Integer # 37 (1 to 31)
Day of Week: Integer # 38 (1 to 7)
Hour: Integer # 39 (0 to 23)
Minute: Integer # 40 (0 to 59)
Network Defaults
The network set point default values are used only for the LONworks protocol. Digital index 10
determines whether the network defaults should be loaded at startup. The startup process is as follows.
Immediately after the controller powers up, the protocol is checked. If the protocol is LONworks, then the
current status of the BAS unit enable set point, digital 1, is stored in a temporary location and the BAS
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