30 WGZ030D through WGZ200D OMM 1130-2
Liquid Line Temperature Sensor Fail (TGZ unit only)
Event description (as shown on screen): Low Source Temp
Trigger: Sensor shorted or open.
Action Taken: None.
Reset: N/A
Low Source Water Temperature (TGZ unit in ‘heat’ mode only)
Event description (as shown on screen): LiqL Sensor Fail N
Trigger: Unit is in heat mode and the leaving evaporator water temperature drops below the Low Source
Temperature set point.
Action Taken: Stage off one compressor immediately and the remaining being staged off based upon the
“InterStage Dn” set point time interval.
Reset: N/A
EXB Comm Failure on CP1 (TGZ unit only)
Event description (as shown on screen): No EXB comm CP1
Trigger: CP1 does not have communication with either EXB1 for 60 seconds after power up. This event
is only active when the expansion board is not intended to operate evaporator or condenser pump #2.
Action Taken: None.
Reset: N/A.
Event Log
An Event Log similar to the Alarm Log stores the last 25 Event occurrences. There must be an active
password for access to the Event Log. To navigate to the Event log press the Left Arrow key from any
Alarm Log screen. When an event occurs, it is recorded in the first slot in the Event Log. All other entries
are moved down in the Event Log and the last entry is dropped if 25 earlier event occurrences have been
logged. Each Event Log entry includes an event description and a time and date stamp for the event
occurrence.
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