Alarms and Events
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IOM 1242-8 • PATHFINDER
®
MODEL AWV CHILLERS
Circuit 2 GFP Fault
Alarm:
Circuit 2 GFP Fault
Displayed Text: C2 Ground Fault
Trigger:
All of the following are true:
• Ground Fault Protection Option set
point = Multi Point
•
GFP Relay 2 input is off for 1 sec
Action Taken:
Rapid shutdown all circuits and lockout unit
from running.
Reset:
Auto reset when GFP Relay 2 input is on
for 5 seconds
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.
Evaporator Water Freeze Protect
Alarm:
Evaporator Water Freeze Protect
Displayed Text: Evap Water Freeze
Trigger:
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.
Action Taken:
Rapid shutdown all circuits and lock out unit
from running
Reset:
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
Alarm:
Evaporator Water Temperatures Inverted
Displayed Text: EvapWaterTempInverted
Trigger:
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
Action Taken:
Normal shutdown all circuits and lock out
unit from running
Reset:
This alarm can be cleared manually via the
keypad or via BAS command.
Evaporator LWT Sensor Fault
Alarm:
Evaporator LWT Sensor Fault
Displayed Text: Evap LWT SenFault
Trigger:
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’
Action Taken:
Rapid shutdown all circuits and lock out
unit from running
Reset:
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’
