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MUA-SVP01A-EN • Direct-Fired Indoor and Outdoor Units 37
Diagnostics
– Yes. Clear and continue.
– No. Continue.
3. Is the airflow switch setpoint properly adjusted?
– No. Adjust setpoint.
– Yes. Continue.
4. Are the wires connected to the air pressure switch's normally open contact?
– No. Rewire switch and continue.
– Yes. Continue.
5. Is the air pressure switch's normally open contact open?
– No. Disconnect the sensing tubes and recheck. Replace the switch if
contacts do not open.
– Yes. Continue.
6. Find the clogged filter switch on the electrical schematic and identify the
control panel terminals to which it is connected. Disconnect the wire from
these terminals. Does this clear the alarm?
– Yes. There is short in the wiring between the terminal strip and the switch.
Determine cause and rectify.
– No. Continue.
7. Unplug the connector from the controller that is connected to the multiplexed
input. Does this clear the alarm?
– Yes. There is short in the wiring of the multiplexed resistors. Determine
cause and rectify.
– No. There is an internal short in the controller. Replace the controller.
FAULT CODE:Energy Save Mode 1
PROBLEM: The controller has turned off the burner enable output because it
determined the mixed air temperature is equal to or greater than the minimum
discharge air temperature setpoint, and the room air temperature is 5°F above
the room air temperature setpoint. See the Energy Savings Mode 1 section of this
manual for more information.
SOLUTION:If setpoints are misadjusted
1. Is the mixed air temperature (MA Temp), displayed on the BACview remote,
greater than or equal to the minimum discharge air temperature setpoint?
– Yes. Increase the HTG MIN DAT setpoint. See Heating Mode - General
Burner Control section of this manual for more information.
– No. Continue.
2. Is the room temperature more than 5°F above the room air temperature
setpoint?
– Yes. I ncrease the HTG OCCUPIED setpoint. See Heating Mode - General
Burner Control section of this manual for more information.