32 TGZ 040A through TGZ 190A OMM TGZ-1
When the evaporator pressure goes below the Low Evaporator Pressure Unload set point, a
timer starts. If this timer exceeds the freeze time, then a ‘Evap Press Low Cir N’ alarm trip
occurs. If the evaporator pressure rises to the unload set point or higher, and the freeze time
has not been exceeded, the timer will reset.
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad if the evaporator pressure is
above the absolute low-pressure limit.
High Condenser Pressure
Alarm description (as shown on screen): Cond Press High Cir N
Trigger: Condenser Pressure > High Condenser Pressure Set Point
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad.
Mechanical High Pressure/Motor Protect
Alarm description (as shown on screen): MHP or Motor Prot N
Trigger: MHP/MP input is low and over 150 seconds lapsed since controller boot-up
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad if the MHP/MP input is high.
Phase Voltage Protection
Alarm description (as shown on screen): Phase/Voltage Cir N
Trigger: PVM input is low and Phase Voltage set point = enable.
Action Taken: Rapid stop circuit
Reset: Auto reset when PVM input is high
Ground Fault Protection
Alarm description (as shown on screen): Ground Fault Cir N
Trigger: GFP input is low and Ground Fault set point = enable.
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad.
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.
Leaving Evaporator Water Temperature Sensor Fault
Alarm description (as shown on screen): Evap LWT Sens 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.
Leaving Condenser Water Temperature Sensor Fault
Alarm description (as shown on screen): CondLWT Sens Fault
Trigger: Sensor shorted or open AND TGZ unit (refrig = R134a) AND operating in ‘heat’
mode.
Action Taken: Normal stop all circuits
Reset: This alarm can be cleared manually via the keypad if the sensor is back in range.
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