Daikin Navigator WWV - Unit Specific Alarms; Evaporator Flow Loss Alarm; Condenser Flow Loss Alarm

OPERATION
NAVIGATOR WWV/TWVDAIKIN APPLIED
42
Description of Alarms
Details for each alarm are listed as shown below.
Displayed Text: Text to be displayed on HMI in the alarm lists.
Trigger: Conditions required to trigger the alarm.
Action Taken: Actions should be taken when alarm triggers.
Reset:
Method by which the alarm can be cleared and
conditions required for doing so, if any.
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 O󰀨 state
2: Evap Pump State = Start for time greater than Re-
circulate 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 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 rst 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 o󰀨 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 ow, then it goes through the recirculation
process after ow 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 ow loss alarm is cleared
If active via trigger condition 2:
If the ow loss alarm has occurred due to this trigger,
it is always a manual reset alarm
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
O󰀨 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 rst 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 o󰀨 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 ow, then it goes through the recir-
culation process after ow 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 ow loss
alarm is cleared
If active via trigger condition 2:
If the ow loss alarm has occurred due to this trigger,
it is always a manual reset alarm
Evaporator/Condenser Water Freeze
Protect
Displayed Text:
Evap Water Freeze
Cond Water Freeze
Trigger: LWT or EWT equal to or less than Freeze Protect
set point for a time at least as long as the evapora-
tor recirculation time. If the sensor fault is active for
either LWT or EWT, then that sensor value cannot
trigger the alarm
Action Taken: Rapid shutdown unit and lock out unit from running
Reset: This alarm can be cleared manually via the unit
controller HMI, but only if specic LWT and EWT
are both above the specied Freeze Protect set
point or have a sensor fault (meaning the tempera-
ture reading is not valid)