2100-444-003A
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Compressor Lockout Failure Unit #1
If Compressor operation is not verified because the High or Low Pressure Lockout Relay has
been energized, Output 5, Unit #1 Compressor, is de-energized and locked out. A critical alarm
is logged in the Event List and Output 12, Shelter Alarm, is energized. Lead unit switches to lag
unit .The Output Alarm must be cleared to resume operation. Verify is tried 3 times before the
output is locked out. Compressor Operation is verified by Unit #1 Compressor Lockout Relay
and Unit #1 Compressor Current Switch.
Compressor Current Failure Unit #1
If Unit #1 Compressor is on and Unit #1 Compressor Current Switch is not valid , a
critical alarm is logged in the Event List and Output 12, Shelter Alarm, is energized. Lead unit
switches to lag unit. The Output Alarm must be cleared to resume operation. Verify is tried 3
times before the output is locked out. Compressor Operation is verified by Unit #1 Compressor
Lockout Relay and Unit #1 Compressor Current Switch.
Dirty Filter Unit #1
If Unit #1 Dirty Filter Switch is closed, a low priority alarm is logged in the Event List and
Output 12, Shelter Alarm, is energized. This alarm must be reset at the unit.
Utility Power Failure
If Input #13, Power Sense, is closed indicating a utility power failure, a critical priority alarm is
logged in the Event list and Output 12, Shelter Alarm, is energized. All unit outputs are de-
energized. Two minutes after the alarm, Output #3, Power Transfer Switch, is energized . Three
minutes after the alarm, Lead Unit Blower and Lead Unit Economizer are energized
continuously until Utility Power Failure Alarm is cleared. This is a self clearing alarm.
Fire Trouble
If Input #9, Fire Trouble, is closed indicating a problem with the Fire Alarm System, a medium
priority alarm is logged in the Event list and Output 12, Shelter Alarm, is energized.
Fire Alarm
If Input #10, Fire Alarm, is closed indicating a fire in the Zone, a critical priority alarm is logged
in the Event list and Output 12, Shelter Alarm, is energized. All unit outputs are de-energized.