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Power Loss While Running
Displayed Text:
C1 PwrLossWhileRun
Trigger:
Circuit is running when controller loses
power
Action Taken:
None
Reset:
N/A
Pumpdown Failure
Displayed Text:
C1 Pumpdown Fail
Trigger:
Circuit state is Pumpdown for more than
two minutes.
Action Taken:
Circuit state goes to Off
Reset:
N/A
Events
Situations may arise that require some action from the chiller
or that should be logged for future reference, but aren't severe
enough to register as alarms. These events are stored in a
separate log from alarms. This log shows the time and date of
the latest occurrence, the count of occurrences for the current
day, and the count of occurrences for each of the previous 7
days.
Unit Power Restore
Trigger:
Unit controller is powered up.
Action Taken: None
Reset:
N/A
Low Evaporator Pressure - Hold
Trigger:
This event will trigger when the unit mode
is Cool, circuit state is Run, and evaporator
pressure drops below the low evaporator
pressure hold value.
Low evaporator pressure hold value = Low
Evaporator Pressure Unload set point + Low
Evaporator Pressure Hold Offset set point
Action Taken: Circuit will not be able to increase in capacity.
Reset:
This event is reset when the evaporator
pressure rises at least 14 kPa (2.03 psi)
above the Low Evaporator Pressure Hold set
point. It is also reset if the circuit is no longer
in the run state or the unit operating mode is
changed to Ice.
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Low Evaporator Pressure - Unload
Trigger:
This event will trigger when the unit mode is
Cool, the circuit state is Run, and evaporator
pressure drops below the Low Evaporator
Pressure Unload set point.
Action Taken: Compressor speed will decrease 1Hz every
second until evaporator pressure rises up to
at least the Low Evaporator Pressure Unload
set point.
Reset:
This event is reset when the evaporator
pressure rises at least 14 kPa (2.03 psi)
above the Low Evaporator Pressure Hold set
point. It is also reset if the circuit is no longer
in the run state or the unit operating mode is
changed to Ice.
High Condenser Pressure - Hold
Trigger:
This event will trigger when the unit mode is
Cool, the circuit state is Run, and saturated
condenser temperature rises above the high
saturated condenser hold value.
Action Taken: Circuit will not be able to increase in capacity.
Reset:
This event is reset when the saturated
condenser temperature drops at least 0.5°C
below the high saturated condenser hold
value. It is also reset if the circuit is no longer
in the run state or the unit operating mode is
changed to Ice.
High Condenser Pressure - Unload
Trigger:
This event will trigger when the unit mode is
Cool, the circuit state is Run, and saturated
condenser temperature rises above the high
saturated condenser unload value.
Action Taken: Compressor speed will decrease 1Hz every
second until saturated condenser temperature
drops below the high saturated condenser
unload value.
Reset:
This event is reset when saturated condenser
temperature drops at least 0.2°C below the
high saturated condenser unload value. It is
also reset if the circuit is no longer in the run
state or the unit operating mode is changed
to Ice.
43
IOM 1264-1 • NAVIGATOR
a
e
larms and
venTs
MODEL WWV CHILLERS
®
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