OMM 1130-2 27
Action Taken: Normal stop all circuits
Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range.
Suction Temperature Sensor Fault
Alarm description (as shown on screen): SuctT Sensor Fail N
Trigger: Sensor shorted or open AND Expansion Valve Type = Electronic
Action Taken: Rapid stop circuit
Reset: This alarm can be cleared manually via the keypad, but only 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, but only 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, but only if the sensor is back in range.
Condenser Entering or Outdoor Air Temperature 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, but only 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 Pressure Change at Start
Alarm description (as shown on screen): NoPressChgAtStartN
Trigger: Circuit has failed twice on a No Pressure Change at Start Condition. A No Pressure Change at
Start Condition indicates that after the start of the first compressor on the circuit, at least a 1 psi drop in
evaporator pressure OR a 1 psi increase in condenser pressure has not occurred after 15 seconds of
compressor operation.
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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