52 OM AGSD-1
Outdoor Air Temperature Sensor Fault
Alarm description (as shown on screen): OAT Sensor Fault
Trigger: Sensor shorted or open
Action Taken: Rapid stop all circuits
Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in
range.
EXB Comm Failure on CP1
Alarm description (as shown on screen): No EXB comm CP1
Trigger: CP1 does not have communication with either EXB1 or EXB4 for 60 seconds
after power up. 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 and EXB4 are communicating with CP1.
Unit Events
The following unit events are logged in the event log with a time stamp.
Entering Evaporator Water Temperature Sensor Fault
Event description (as shown on screen): EWT Sensor Fail
Trigger: Sensor shorted or open
Action Taken: Return water reset cannot be used.
Reset: Auto reset when sensor is back in range.
Circuit Stop Alarms
All circuit stop alarms require shutdown of the circuit on which they occur. Rapid stop
alarms do not do a pumpdown before shutting off. All other alarms will do a pumpdown.
The red button LED on the circuit controller is turned on when any circuit stop alarm
occurs. It is turned off when all circuit alarms have been cleared. In addition, the alarm
status is sent to the unit control so the alarm output and the red button led on the unit
controller can be energized while alarms are active.
Alarm descriptions apply to both circuits, the circuit number is represented by ‘N’ in the
description.
Phase Volts Loss/GFP Fault
Alarm description (as shown on screen): PVM/GFP Fault N
Trigger: PVM input is low and PVM setpoint = Multi Point
Action Taken: Rapid stop circuit
Reset: Auto reset when PVM input is high
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