OMM TGZ-1 TGZ 040A through TGZ 190A 35
High Condenser Pressure - Unload
Event description (as shown on screen): CondPressHighUnloadN
Trigger:
This event is triggered if all of the following are true:
• circuit state = Run
• more than one compressor is running on the circuit
• condenser pressure > High Condenser Pressure – Unload set point
Action Taken: Stage off one compressor on the circuit every 10 seconds, except the last
one.
Reset: While still running, the event will be reset if condenser pressure drops below the
“Hold Clear @” value which is displayed on that circuit’s VIEW CIRCUIT n (1) screen.
The “Hold Clear @” is calculated based on number of compressors, refrigerant, and
number of High Condenser Pressure – Unload occurrences since the circuit has cycled off
or since midnight. See table below:
CONDENSER
CONFIGURATION
COMPRESSORS R134a
STEP-
INCREASE
4 30 psi 10 psi
Water Cooled
6 20 psi 10 psi
Failed Pumpdown
Event description (as shown on screen): Pumpdown Fail Cir N
Trigger: Circuit state = pumpdown for time > 60 seconds
Action Taken: Shutdown circuit
Reset: N/A
Condenser Freeze Event
Event description (as shown on screen): Cond Freeze Circ N
Trigger: Cond Sat Refr Temperatre < Condenser Freeze Set Point AND Condenser Pump
State = OFF
Action Taken: Start condense pump.
Reset: N/A
Condenser Freeze Event (Water Cooled = Y Only)
Event description (as shown on screen): Cond Freeze Circ N
Trigger: Cond Sat Refr Temp < Condenser Freeze Set Point AND Condenser Pump State =
OFF
Action Taken: Start condenser pump.
Reset: Cond Sat Refr Temp > Condenser Freeze Set Point plus 2°F.
Suction Temperature Sensor Fail
Event description (as shown on screen): SuctT Sensor Fail N
Trigger: Sensor shorted or open.
Action Taken: None.
Reset: N/A
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