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No Pressure Change At Start
Displayed Text:
C1 No Press Chg Start
Trigger:
After start of compressor, at least a 7 kPa
drop in evaporator pressure or 25 kPa
increase in condenser pressure has not
occurred within 40 seconds.
Action Taken:
Rapid stop circuit
Reset:
This alarm can be cleared manually via the
Unit Controller unit controller HMI or BAS
command.
No Pressure At Start
Displayed Text:
C1 No Press At Start
Trigger:
All of the following must be true to trigger:
• Circuit start requested
• 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 unit controller HMI or BAS
command.
Low Discharge Superheat
Displayed Text:
C1 Disc SH Low
Trigger:
If both of the following are true for at least
30 minutes, the alarm is triggered:
• Circuit state is not Off
• DSH < Low DSH Limit set point
Action Taken:
Normal shutdown of unit and lock out from
running on the third occurrence.
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or via BAS command.
Low Pressure Ratio
Displayed Text:
C1 Low Pr Ratio
Trigger:
Circuit state is Run and pressure ratio <
1.3 for a time > Low Pressure Ratio Delay
set point.
This alarm is actually triggered on the third
occurrence of the above conditions within
2 hours. Prior occurrences are events.
Action Taken:
Rapid shutdown of unit and lock out from
running on the third occurrence.
Reset:
This alarm will auto clear on the first and
second occurrences. This third occurrence
can be cleared manually via the Unit
Controller HMI or via BAS command.
IOM 1264-1 • NAVIGATOR
®
MODEL WWV CHILLERS
High Motor Current
Displayed Text:
C1 MotorCurrent High
If all of the following are true, the alarm is
triggered:
• Circuit state is Start, Run, or
Trigger:
Pumpdown
• Motor current > VFD Continuous
Current Rating x 1.1 for at least 2
seconds
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via
the Unit Controller unit controller HMI or
via BAS command.
High Compressor VFD Current
Displayed Text:
Cn Vfd Current High
Trigger:
This 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 > VFD Primary
RLA set point x 1.05
VFD Primary RLA set point is part of the
unit configuration.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or via BAS command.
Compressor VFD Comm Failure
Displayed Text:
C1 CompVfd CommFail
Trigger:
Communication with the compressor
VFD has failed. This means that either a
modbus configuration error has occurred,
or a modbus command has failed in
10 consecutive loops of the modbus
commands for this node address.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or via BAS command if
communication has been restored for five
seconds.
40
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