Daikin McQuay AGZ-D, Operating And Maintenance Manual, Page: 40 / 82

40 AGZ 025D through 190D OMM 1087
No Pressure Change After Start
Trigger: After start of compressor, at least a 7 KPA (1 PSI) drop in evaporator pressure OR 35 KPA
(5.1 PSI) increase in condenser pressure has not occurred after 15 seconds. The actual alarm will not
be triggered until the second occurrence.
Action Taken: Rapid stop circuit.
Reset: This alarm can be cleared manually via the keypad or via BAS command.
Evaporator Pressure Sensor Fault
Trigger: Sensor shorted or open.
Action Taken: Rapid stop circuit.
Reset: This alarm can be cleared manually via the keypad or BAS command, but only if the sensor is
back in range.
Condenser Pressure Sensor Fault
Trigger: Sensor shorted or open.
Action Taken: Rapid stop circuit.
Reset: This alarm can be cleared manually via the keypad or BAS command, but only if the sensor is
back in range.
Suction Temperature Sensor Fault
Trigger: Sensor shorted or open and Expansion Valve Type = Electronic.
Action Taken: Normal shutdown of circuit.
Reset: This alarm can be cleared manually via the keypad or BAS command, but only if the sensor is
back in range.
Circuit Events
Low Evaporator Pressure - Hold
Trigger:
This event is triggered if all of the following are true:

circuit state = Run

evaporator pressure <= Low Evaporator Pressure - Hold set point

circuit is not currently in a low OAT start

it has been at least 30 seconds since a compressor has started on the circuit.
Action Taken: Inhibit starting of additional compressors on the circuit.
Reset: While still running, the event will be reset if evaporator pressure > Low Evaporator Pressure
Hold SP + 90 KPA(13 PSI). The event is also reset if the circuit is no longer in the run state.