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High Condenser Pressure
Text:
C1 CondPressHigh
Trigger:
Saturated Condenser Temp > Max Saturated
Condenser Value for time longer than High
Condenser Pressure Delay set point. Cannot
trigger if CC1 module commination is not
working.
Action Taken:
Rapid shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
unit controller HMI if Saturated Condenser
Temp < Max Saturated Condenser Value.
Mechanical High Pressure Switch
Displayed Text:
C1 MHP Switch
Trigger:
Compressor VFD reports Safe Stop alarm
or warning. The alarm is bit 30 in the
Alarm word and the warning is bit 30 in the
Warning word from the VFD..
Action Taken:
Rapid shutdown of unit and lock out from
running.
Reset:
This alarm can be cleared manually via the
Unit Controller HMI. When alarm is cleared,
command to reset alarms should be sent
to VFD.
High Discharge Temperature
Displayed Text:
C1 DiscTempHigh
Trigger:
The following are true for one second:
• Circuit state is Start, Run, or
Pumpdown
• Discharge Temperature > High
Discharge Temperature set point
• discharge temperature sensor fault is
not active
Action Taken:
Normal shutdown of unit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller HMI or via BAS command.
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High Oil Pressure Difference
Displayed Text:
C1 Oil PD High
Trigger:
Circuit is in the Run state and Oil Pressure
Difference > High Oil Pressure Difference
value for a time longer than High Oil
Pressure Difference Delay set point.
High Oil Pressure Difference value is
calculated as shown
Operating PD = Condenser Pressure –
Evaporator Pressure
Minimum for High Oil Pressure Difference
= High Oil Pressure Difference set point
Maximum for High Oil Pressure Difference
= High Oil Pressure Difference set point +
100kPa
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.
Figure 21: High Oil Pressure Difference Values
High Oil Pressure
Difference Value
Max value
Min value
1000kPa
High Motor Temperature
Displayed Text:
C1 Motor Temp High
Trigger:
Compressor VFD reports motor overheat
alarm.
Action Taken:
Rapid shutdown of circuit and lock out from
running
Reset:
This alarm can be cleared manually via the
Unit Controller unit controller HMI when
compressor has been off for at least 5
minutes. When the alarm is cleared in the
unit controller, the command to clear the
fault in the VFD will be sent.
39
IOM 1264-1 • NAVIGATOR
a
e
larms and
Figure
21.
1500kPa
Operating PD
MODEL WWV CHILLERS
®
venTs
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