Daikin MicroTech Operation And Maintenance page 55

Condensate Overflow Indication
Name: CondensateOverflowAlarm
Description: Condensate overflow indication (drain pan full of
condensate).
Type: Problem
Activate: The unit is configured for condensate overflow
detection and the sensor indicates high levels of condensate in
the drain pan.
Upon active:
• State: If in cooling state then transition to economizer
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
• CompCoolAvail is set to UNAVAIL.
• Outdoor fan is de-energized normally then remains de-
energized
• Chilled water valve is forced closed
• Cooling EOC valve is forced closed
• Heat / Cool EOC is closed if water-in temperature
indicates cooling
Deactivate: Activate is not Active.
Reset: Auto
Indoor Air Coil Refrigerant Temperature Sensor
Failure
Name: IndoorAirCoilDxTempSensorAlarm
Description: Indoor air coil DX temp sensor failure (short or
open).
Type: Problem
Activate: Appropriate input is configured for an indoor 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
(MultAlarmComp = ACTIVE)
• Outdoor fan is de-energized normally then remains de-
energized
Deactivate: Sensor reading goes back in range.
Reset: Auto
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Outdoor Air Temperature Sensor Failure
Name: OATSensorAlarm
Description: Outdoor air temp sensor failure (short or open
detected)
Type: Fault
Activate: Appropriate input is configured for an outdoor air
temperature sensor and the sensor reading is out of range.
Upon active:
• Alarm type is Fault which causes unit shutdown
• Fault relay is energized.
• LED output alarm indication is activated
Deactivate: Sensor reading goes back in range.
Reset: Auto
Discharge Air Temperature Sensor Failure
Name: DATSensorAlarm
Description: Discharge air temperature sensor failure (short or
open detected).
Type: Fault
Activate: Discharge Air Temperature reading is out of range.
Upon active:
• Alarm type is Fault which causes unit shutdown
• Fault relay is energized
• LED output alarm indication is activated
• Heating valve is fully opened to the coil
• Chilled water valve is fully opened to the coil 2 pipe only
• Chilled water valve is fully closed to the coil 4 pipe only
• Heat/cool valve is fully opened to the coil
Deactivate: Sensor reading goes back in range.
Reset: Auto
55 OM 1280-2 • MICROTECH UNIT CONTROLLER
Diagnostics and Service