Alarms and Events
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IOM 1242-8 • PATHFINDER
®
MODEL AWV CHILLERS
No Pressure At Start
Alarm:
No Pressure At Start
Displayed Text: Cn No Press At Start
Trigger:
All of the following must be true to trigger:
• Circuit start requested
•
Condenser Fan VFD Configuration
set point = None
• Either Evaporator Pressure or
Condenser Pressure are less than 35
kPa (5.1 psi)
Action Taken:
Abort start of circuit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller keypad or BAS command if
Evap Pressure and Cond Pressure are at
least 35 kPa (5.1 psi).
Low Discharge Superheat
Alarm:
Low Discharge Superheat
Displayed Text: Cn Disc SH Low
Trigger:
If all of the following are true for at least 30
minutes, the alarm is triggered:
• Circuit state is Start or Run
•
Liquid injection is off
• DSH < Low DSH Limit set point
Action Taken:
Normal shutdown of circuit
Reset:
This alarm can be cleared manually via the
Unit Controller keypad or via BAS command.
Compressor VFD Current Output High
Alarm:
High Compressor VFD Output Current
Displayed Text: Cn CmpVFD Curr Out Hi
Trigger 1:
VFD Output Current > Max Motor Current x
1.05 for at least 30 seconds
Trigger 2:
[VFD Output Current > Max Motor Current x
0.99 AND Compressor Speed < 20 Hz] for
at least 180 seconds .
See the section covering circuit level
calculations for the details on the Max Motor
Current value.
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via
the Unit Controller keypad or via BAS
command.
Compressor VFD Current Input High
Alarm:
High Compressor VFD Input Current
Displayed Text: Cn CmpVFD Curr In Hi
Trigger:
Alarm will trigger when all of the following
are true for at least 5 seconds:
• Unit mode is Ice
• Compressor is running
• VFD Input Current > Compressor RLA
set point x 105%
Compressor RLA set point for each circuit is
part of the unit configuration.
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via
the Unit Controller keypad or via BAS
command.
Compressor VFD Temperature High
Alarm:
Compressor VFD Temperature High
Displayed Text: Cn CompVfdTempHigh
Trigger:
VFD Heatsink temperature > Max VFD
Temperature for 5 seconds
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via
the Unit Controller keypad or via BAS
command if temperature ≤ Max VFD
Temperature.
Compressor VFD Temperature Low
Alarm:
Compressor VFD Temperature Low
Displayed Text: Cn CompVfdTempLow
Trigger:
This alarm is triggered if the Compressor
Type is set as 3120 or 3122 and
Compressor VFD Temp ≤ -10°C for at least
5 seconds
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via
the Unit Controller keypad or via BAS
command if Compressor VFD temperature
> -5°C.
