IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 58 www.DaikinApplied.com
High Condenser Pressure - Unload
Event description (as shown on screen):
CondPressHighUnloadN
Trigger:
This event is triggered if all of the following are true:
• Circuit state = Run
• More than one compressor is running on the circuit
• Condenser pressure > High Condenser Pressure –
Unload set point
Action Taken: Stage o one compressor on the circuit every
10 seconds, except the last one.
Reset: While still running, the event will be reset if condenser
pressure drops below the “Hold Clear @” value which is
displayed on that circuit’s VIEW CIRCUIT n (1) screen. The
“Hold Clear @” is calculated based on number of compressors,
refrigerant, and number of High Condenser Pressure – Unload
occurrences since the circuit has cycled o or since midnight.
See table below:
Event description (as shown on screen):
Pumpdown Fail Cir N
Trigger: Circuit state = pumpdown for time > 60 seconds
Action Taken: Shutdown circuit
Reset: N/A
Event description (as shown on screen):
Cond Freeze Circ N
Trigger: Cond Sat Refr Temperatre < Condenser Freeze Set
Point AND Condenser Pump State = OFF
Action Taken: Start condense pump.
Reset: N/A
Event description (as shown on screen):
Cond Freeze Circ N
Trigger: Cond Sat Refr Temp < Condenser Freeze Set Point
AND Condenser Pump State = OFF
Action Taken: Start condenser pump.
Reset: Cond Sat Refr Temp > Condenser Freeze Set Point
plus 2°F.
Event description (as shown on screen):
SuctT Sensor Fail N
Trigger: Sensor shorted or open.
Action Taken: None.
Reset: N/A
Entering Evaporator Water Temperature
Event description (as shown on screen):
Evap EWT Sensor Fail
Trigger: Sensor shorted or open.
Action Taken: None.
Reset: N/A
Event description (as shown on screen): Low Source Temp
Trigger: Sensor shorted or open.
Action Taken: None.
Reset: N/A
Low Source Water Temperature (TGZ
Event description (as shown on screen): LiqL Sensor Fail N
Trigger: Unit is in heat mode and the leaving evaporator water
temperature drops below the Low Source Temperature set
point.
Action Taken: Stage o one compressor immediately and the
remaining being staged o based upon the “InterStage Dn” set
point time interval.
Reset: N/A
Event description (as shown on screen):
No EXB comm CP1
Trigger: CP1 does not have communication with either EXB1
for 60 seconds after power up. This event is only active when
the expansion board is not intended to operate evaporator or
condenser pump #2.
Action Taken: None.
Reset: N/A.
Event Log
An Event Log similar to the Alarm Log stores the last 25 Event
occurrences. There must be an active password for access
to the Event Log. To navigate to the Event log press the Left
Arrow key from any Alarm Log screen. When an event occurs,
it is recorded in the rst slot in the Event Log. All other entries
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