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38 Direct-Fired Indoor and Outdoor Units • MUA-SVP01A-EN
Diagnostics
– No. Continue.
SOLUTION:If setpoints are not misadjusted
1. Is there a prior alarm such as Insufficient OA?
– Yes. See the Diagnostic section for the previous alarm.
– No. Continue.
2. Is the discharge air temperature (DA Temp), displayed on the BACview
remote, reading 150°F or more?
– Yes. That sensor circuit or the sensor itself is shorted. Unplug the input
jack from the AdaptAire controller. Did the display change to -40°F or less?
– No. There is a short in the controller input. Replace the controller.
– Yes. Disconnect the sensor wiring at the sensor. Connect an ohmmeter
to the sensor. If it is shorted replace the sensor. At 70°F the resistance
should be 10K?. See thermistor output curve for other temperatures. If
it is not shorted, there is a short in the wiring between the sensor and
the input plug. Determine cause and rectify. Refer to Appendix II for a
typical 10K? thermistor output curve.
– No. Contact factory.
FAULT CODE:Energy Save Mode 2
PROBLEM: The controller has turned off the burner enable output because it
determined the burner's minimum firing rate exceeds the allowable equivalent
temperature rise. See the Energy Savings Mode 2 section of this manual for more
information.
SOLUTION: If OAT, RoomT or DAT are such that heat is required
1. Are the outside air hood filters or bird screen or any associated outside air
ductwork obstructed?
– Yes. Clear obstruction or change filters.
– No. Continue.
2. Are the outside air and return air dampers and actuators working properly?
– Yes. Continue.
– No. Make necessary adjustments and force the unit to recalibrate. See
Calibrate in the Resets Section of this manual.
3. If equipped, are the flow measuring station pitot tubes and pressure tubing
clear?
– Yes. Continue.
– No. Clean and force the unit to recalibrate. See Calibrate in the Resets
Section of this manual.
4. Do the dampers track with a change in the %OA setpoint? The dampers
utilized on the unit are not linear with respect to airflow and openness, and as
such, the proportion of outside air to damper movement will not be exactly