OMM TGZ-1 TGZ 040A through TGZ 190A 33
Suction Temperature Sensor Fault
Alarm description (as shown on screen): SuctT Sensor Fail N
Trigger: Sensor shorted or open AND Expansion Valve Type = Thermostatic
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad if the sensor is back in range.
Evaporator Pressure Sensor Fault
Alarm description (as shown on screen): EvapP Sensor Fail N
Trigger: Sensor shorted or open. If failing high (open), logic has been added that requires
the Leaving Evaporator Temperature to be below 75°F. This will prevent nuisance trips due
to conditions where the evaporator water temperature is high which could cause false
alarms.
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad if the sensor is back in range.
Condenser Pressure Sensor Fault
Alarm description (as shown on screen): CondP Sensor Fail N
Trigger: Sensor shorted or open
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad if the sensor is back in range.
Condenser Entering Sensor Fault
Alarm description (as shown on screen): OAT Sensor Fault
Trigger: Sensor shorted or open
Action Taken: Normal stop all circuits
Reset: This alarm can be cleared manually via the keypad if the sensor is back in range
Evaporator Water Freeze Protect
Alarm description (as shown on screen): Evap Water Freeze
Trigger: Evaporator LWT drops below evaporator freeze protect set point AND Unit State
= Auto
Action Taken: Rapid stop all circuits
Reset: This alarm can be cleared manually via the keypad or via the BAS clear alarm
signal, but only if the alarm trigger conditions no longer exist.
No Evaporator Pressure Drop
Alarm description (as shown on screen): No Evap Press Drop N
Trigger: After start of first compressor on the circuit, either a 1 psi drop in evaporator
pressure OR a 5 psi rise in condenser pressure has not occurred after 15 seconds
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad.
EXB Comm Failure on CP1
Alarm 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 alarm will only occur if 10 Fan , evaporator pump #2, or condenser pump #2
operation is selected. After communication is established, when communication is lost to
either EXB an immediate shutdown occurs.
Action Taken: Rapid stop all circuits
Reset: Auto clear when EXB1 is communicating with CP1.
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