Diagnostics and Service
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OM 1280-2 • MICROTECH UNIT CONTROLLER
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
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
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