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Unit Alarms
Evaporator Flow Loss
Displayed Text: Evap Water Flow Loss
Trigger:
1: Evap Pump State = Run AND Evap Flow
Digital Input = No Flow for time > Flow Loss
Delay set point AND at least one circuit is
not in the Off state
2: Evap Pump State = Start for time greater
than Recirculate Timeout set point and all
pumps have been tried and Evap Flow
Digital Input = No Flow
Action Taken:
Rapid shutdown all circuits and:
- if an auto reset occurrence has triggered,
keep unit enabled and allow the evaporator
recirculation sequence to proceed
- if a manual reset occurrence has been
triggered, lock out unit from running.
Reset:
This alarm can be cleared at any time
manually via the unit controller HMI or via
the BAS clear alarm command.
If active via trigger condition 1:
When the alarm occurs due to this trigger,
it can auto reset the first two times each
day, with the third occurrence being manual
reset. When the auto reset occurrences are
triggered the unit will remain enabled to run
(rather than going to an off state).
For the auto reset occurrences, the alarm
will reset automatically when the evaporator
state is Run again. This means the alarm
stays active while the unit waits for flow, then
it goes through the recirculation process
after flow is detected. Once the recirculation
is complete, the evaporator goes to the Run
state which will clear the alarm. After three
occurrences, the count of occurrences is
reset and the cycle starts over if the manual
reset flow loss alarm is cleared.
If active via trigger condition 2:
If the flow loss alarm has occurred due
to this trigger, it is always a manual reset
alarm.
IOM 1264-1 • NAVIGATOR
®
MODEL WWV CHILLERS
Condenser Flow Loss
Displayed Text: Cond Water Flow Loss
Trigger:
1: Condenser Pump State = Run AND
Condenser Flow Digital Input = No Flow for
time > Flow Loss Delay set point AND at
least one circuit is not in the Off state
2: Condenser Pump State = Start for
time greater than Recirculate Timeout set
point and all pumps have been tried and
Evaporator Flow Digital Input = No Flow
Action Taken:
Rapid shutdown all circuits and:
-if an auto reset occurrence has triggered,
keep unit enabled and allow the evaporator
recirculation sequence to proceed
-if a manual reset occurrence has been
triggered, lock out unit from running
Reset:
This alarm can be cleared at any time
manually via the keypad or via the BAS clear
alarm command.
If active via trigger condition 1:
When the alarm occurs due to this trigger,
it can auto reset the first two times each
day, with the third occurrence being manual
reset. When the auto reset occurrences are
triggered the unit will remain enabled to run
(rather than going to an off state).
For the auto reset occurrences, the alarm
will reset automatically when the evaporator
state is Run again. This means the alarm
stays active while the unit waits for flow, then
it goes through the recirculation process
after flow is detected. Once the recirculation
is complete, the evaporator goes to the Run
state which will clear the alarm. After three
occurrences, the count of occurrences is
reset and the cycle starts over if the manual
reset flow loss alarm is cleared.
If active via trigger condition 2:
If the flow loss alarm has occurred due
to this trigger, it is always a manual reset
alarm.
36
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larms and
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