Daikin MicroTech Operation And Maintenance page 60

Low Outdoor Air Refrigerant Coil Temperature
Name: LowOACoilTempAlarm
Description: The outdoor air refrigerant coil temperature value
goes below minimum setpoint.
Type: Problem
Activate: Outdoor air refrigerant coil temperature <= outdoor
air refrigerant coil temperature setpoint and for longer than the
defrost check time.
Upon active:
• State: Defrost when it occurs.
• Fault relay is energized if alarm output configuration is
FAULTPROB
• LED output alarm indication is activated
Deactivate: Outdoor air refrigerant coil temperature >= outdoor
air refrigerant coil temperature setpoint + 4°F.
Reset: Auto
Return Temperature Sensor Failure
Name: ReturnTempSensorAlarm
Description: Return Temperature Sensor Failure (short or
open detected).
Type: Problem
Activate: The software configuration indicates a room/
return air temperature sensor is installed and the return air
temperature is reading out of range.
Upon active:
• Control temperature will be based on space temperature
if available. If space temperature is not available then
ControlTempAlarm becomes active
• Fault relay is energized if alarm output configuration is
FAULTPROB
• LED output alarm indication is activated
Deactivate: Return/room air temperature reading is in range.
Reset: Auto
OM 1280-2 • MICROTECH UNIT CONTROLLER
Factory Configuration String Alarm
Name: FactoryConfigStringAlarm
Description: There was a problem with the factory
config string that was read in. User must verify all factory
configuration parameters.
Type: Fault
Activate: FactoryConfigError is Active.
Upon active:
• Alarm type is Fault which causes unit shutdown
• Unit state goes to 'Off Alarm
• Alarm is indicated on the LUI
• Fault relay is energized
• LED output alarm indication is activated
• Space fan is immediately de-energized
• Compressor is immediately de-energized
• Outdoor fan is immediately de-energized
• Outside air damper is forced closed
• All electric heat stages are de-energized
• Face and bypass damper is positioned to 100% face
• Heat/cool valves are fully opened to the coil
Deactivate: none
Reset: Manual
Control Temp Alarm
Name: ControlTempAlarm
Description: Neither Space Temp nor Return Temp is
available.
Type: Fault
Activate: Space and return/room air temperature are out of
range.
Upon active:
• Unit state goes to 'Off Alarm'
• Alarm is indicated on the LUI
• Compressor is immediately de-energized
• Fault relay is energized
• LED output alarm indication is activated
• Space fan is immediately de-energized
• Compressor is immediately de-energized
• Outdoor fan is immediately de-energized
• Outside air damper is forced closed
• All electric heat stages are de-energized
• Face and bypass damper is positioned to 100% face
• Heating/chilled water valve is fully opened to the coil (2
pipe)
• Chilled water valve is fully closed to the coil (4 pipe)
Deactivate: Space or return/room air temperature are in range
and the alarm is reset from the network, LUI, or room sensor.
Reset: Manual
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Diagnostics and Service
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