www.DaikinApplied.com 59 OM 1280-2 • MICROTECH UNIT CONTROLLER
Can’t Heat Alarm
Name: CantHeatAlarm
Description: The unit is trying to heat, but conditions do not
allow this (entering water temperature is too low to heat and no
other form of heating is available), or an ASHP has a call for
heating but the compressor is locked out because of low OAT,
Type: Problem
Activate: All of the following are true:
• Heating is required
• Compressor heat is unavailable
• Entering water is too cold for hydronic heating
•
Upon active:
• Alarm is indicated on the LUI
•
FAULTPROB
• LED output alarm indication is activated
Deactivate: Compressor heating becomes available or the
entering water temperature becomes warm enough to provide
heat.
Reset: Auto
Discharge Air Temperature Low Limit
Name: DATLLAlarm
Description: The discharge air temperature is below the
Economizer Low Limit setpoint and heating capacity is at 100%
for longer than the discharge air temperature low limit alarm
timer. This alarm can occur from any state except compressor
or hydronic cooling.
Type: Problem
Activate
economizer low limit setpoint AND it’s not in compressor or
hydronic cooling and all heat stager are on.
Upon active:
• State: Any non-cooling mode go to Low Limit State
— OA reduced
• State: Any cooling mode go to Reheat State
— Heating increased
•
FAULTPROB
• LED output alarm indication is activated
Deactivate
economizer low limit setpoint + 1.8°F and the outdoor air
damper position has returned to its calculated minimum
position.
Reset: Auto
Brownout (Future)
Name: BrownoutAlarm
Description: 24VAC input voltage is more than 20% below
nominal.
Type: Problem
Activate
Upon active:
• Compressor is immediately de-energized
•
FAULTPROB
• LED output fault indication is activated
Deactivate
Reset: Auto
High Voltage (Future)
Name: HighVoltageAlarm
Description: 24VAC input voltage is more than 20% above
nominal.
Type: Problem
Activate
Upon active:
• Compressor is immediately de-energized
•
FAULTPROB
• LED output alarm indication is activated
Deactivate
Reset: Auto
Change Filter Indication
Name: ChangeFilterAlarm
Description: The indoor fan has been running for longer than
dirty:
Type: Warning
Activate
Upon active:
• Alarm is indicated on the LUI
Deactivate: Filter reset command is sent from the network or
LUI keypad.
Upon De-active:
• Set Filter Change Hours to 0
Reset: Auto.
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