OM 1280-2 • MICROTECH UNIT CONTROLLER 56 www.DaikinApplied.com
Outdoor Air Coil Refrigerant Temperature Sensor
Failure
Name: OutdoorAirCoilDxTempSensorAlarm
Description: Outdoor air coil refrigerant temperature sensor
failure (short or open detected).
Type: Problem
Activate
temperature sensor and the sensor reading is out of range.
Upon active:
• State:
— If in cooling state then transition to a non-DX cooling
state, if available, otherwise transition to Fan Only.
— If in heating then transition to a non-DX heating state,
if available, otherwise transition to Fan Only.
• Alarm is indicated on the LUI
•
FAULTPROB.
• LED output alarm indication is activated
• Compressor is immediately de-energized
• Outdoor fan is de-energized
Deactivate: Sensor reading goes back in range.
Reset: Auto
Water Coil Refrigerant Temperature Sensor
Failure
Name: WaterCoilDxTempSensorAlarm
Description: Water Coil Refrigerant Temperature Sensor
Failure (short or open detected).
Type: Problem
Activate: Unit is a WSHP and an appropriate input is
the sensor reading is out of range.
Upon active:
• State:
— If in cooling state then transition to a non-DX cooling
state, if available, otherwise transition to Fan Only
— If in heating then transition to a non-DX heating state,
if available, otherwise transition to Fan Only
• Alarm is indicated on the LUI
•
FAULTPROB
• LED output alarm indication is activated
• Compressor is immediately de-energized
Deactivate: Sensor reading goes back in range.
Reset: Auto
Water-Out Temp Sensor Failure
Name: WaterOutTempSensorAlarm
Description: Leaving water temperature sensor failure (short
or open).
Type: Problem
Activate
temperature sensor and the sensor reading is out of range.
Upon active:
• State: If in cooling state then transition to a non-DX
cooling state, if available, otherwise transition to Fan Only
• Alarm is indicated on the LUI
•
FAULTPROB
• LED output alarm indication is activated
Deactivate: Sensor reading goes back in range.
Reset: Auto
Entering Water Temperature Sensor Failure
Name: WaterInTempSensorAlarm
Description: Entering water temperature sensor failure (short
or open).
Type: Problem
Activate
temperature sensor and the sensor reading is out of range.
Upon active:
• If in hydronic cooling state/heating then switch to non-
hydronic cooling/heating state if available, otherwise
transition to Fan Only
• Alarm is indicated on the LUI
•
FAULTPROB
• LED output alarm indication is activated
• Hydronic cooling/heating is disabled
Deactivate: Sensor reading goes back in range.
Reset: Auto
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