alarms and evenTs
www.DaikinApplied.com 77 IOM 1242-2 • PATHFINDER
®
MODEL AWV CHILLERS
DC Fan Motor Fault
Alarm: DC Fan Motor Fault
Displayed Text: Cn DcFanMotorFault
Trigger: Any DC fan motor on the circuit has a
fault as indicated by a ag sent from the
DC controller.
Action Taken: None
Reset: Fault ag is not set for at least one
second. This alarm can be cleared
manually via the keypad or BAS
command if trigger condition is not true.
When the alarm clear command is set via
keypad or BAS, a request to clear alarms
is sent to the DC controller.
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 track as alarms. These events are stored in a log
separate from alarmsbut accessed through the alarm menu.
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 seven 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, the circuit state is Run, and evaporator
pressure drops below the low evaporator
pressure hold value for 5 seconds.
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 value
for 3 seconds. It is also reset if the circuit is no
longer in the Run state or the unit operating
mode is changed to Ice.
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 for 5 seconds.
Action Taken: Compressor speed will decrease by 1 Hz
every second.
Reset: This event is reset when the evaporator
pressure rises above the Low Evap Pressure
Unload set point for 5 seconds. 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 =
Cool, compressor is running, and saturated
condenser temperature > high saturated
condenser hold value for at least 5 seconds.
Action Taken: Compressor will not be able to increase
Reset: This event is cleared when the saturated
condenser temperature drops at least 2°C
below the high saturated condenser hold
value for at least 3 minutes. It is also cleared 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 =
Cool, compressor is running, and saturated
condenser temperature > high saturated
condenser unload value for at least one
second.
Action Taken: The compressor speed will decrease 1 Hz
every second.
Reset: This event is cleared when saturated
condenser temperature < high saturated
condenser unload value for at least 5
seconds. It is also cleared if the compressor is
no longer in the Run state or the unit operating
mode is changed to Ice.
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