Evaporator Flow Loss; Evaporator Water Freeze Protect; Evaporator Water Temperatures Inverted; Evaporator Lwt Sensor Fault - Daikin Pathfinder AWV Series Installation, Operation And Maintenance Manual

Evaporator Flow Loss

Alarm: 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 Proof
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 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.
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Evaporator Water Freeze Protect

Alarm:
Displayed Text:
Trigger:
Action Taken:
Reset:

Evaporator Water Temperatures Inverted

Alarm:
Displayed Text:
Trigger:
Action Taken:
Reset:

Evaporator LWT Sensor Fault

Alarm:
Displayed Text:
Trigger:
Action Taken:
Reset:
69 IOM 1242-2 • PATHFINDER
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Evaporator Water Freeze Protect
Evap Water Freeze
Evaporator LWT or EWT equal to or
less than Evaporator Freeze Protect
set point for a time at least as long
as the evaporator recirculation time.
If the sensor fault is active for either
LWT or EWT, then that sensor value
cannot trigger the alarm.
Rapid shutdown all circuits and lock
out unit from running
This alarm can be cleared manually
via the keypad, but only if evaporator
LWT and EWT are both above the
Evaporator Freeze Protect set point
or have a sensor fault (meaning the
temperature reading is not valid).
Evaporator Water Temperatures
Inverted
EvapWaterTempInverted
All of the following are true for at least
60 seconds:
• Evap EWT < Evap LWT – 1°C
• at least one circuit is in Start or
Run state
• EWT sensor fault not active
• LWT sensor fault not active
Normal shutdown all circuits and lock
out unit from running
This alarm can be cleared manually
via the keypad or via BAS command.
Evaporator LWT Sensor Fault
Evap LWT SenFault
If any of the following occur for more
than one second:
• Resistance value is < 340 Ω
• Resistance value is > 300 kΩ
• Reliability value reported for input
is anything other than 'NoFault'
Rapid shutdown all circuits and lock
out unit from running
This alarm can be cleared manually
via the keypad or BAS command if
the following are true for at least 5
seconds:
• Resistance value is from 340 Ω
to 300 kΩ
• Reliability value reported for input
is 'NoFault'
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