Daikin MicroTech Operation And Maintenance page 56

Outdoor Air Coil Refrigerant Temperature Sensor
Failure
Name: OutdoorAirCoilDxTempSensorAlarm
Description: Outdoor air coil refrigerant temperature sensor
failure (short or open detected).
Type: Problem
Activate: Unit is not configured as a split system, an
appropriate input is configured for an outdoor air coil refrigerant
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
• Fault relay is energized if alarm output configuration is
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
configured for a water coil refrigerant 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
• Fault relay is energized if alarm output configuration is
FAULTPROB
• LED output alarm indication is activated
• Compressor is immediately de-energized
Deactivate: Sensor reading goes back in range.
Reset: Auto
OM 1280-2 • MICROTECH UNIT CONTROLLER
Water-Out Temp Sensor Failure
Name: WaterOutTempSensorAlarm
Description: Leaving water temperature sensor failure (short
or open).
Type: Problem
Activate: Appropriate input is configured for a leaving water
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
• Fault relay is energized if alarm output configuration is
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: Appropriate input is configured for an entering water
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
• Fault relay is energized if alarm output configuration is
FAULTPROB
• LED output alarm indication is activated
• Hydronic cooling/heating is disabled
Deactivate: Sensor reading goes back in range.
Reset: Auto
56
Diagnostics and Service
www.DaikinApplied.com