36 TGZ 040A through TGZ 190A OMM TGZ-1
Entering Evaporator Water Temperature Sensor Failure
Event description (as shown on screen): Evap EWT Sensor Fail
Trigger: Sensor shorted or open.
Action Taken: None.
Reset: N/A
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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