Table 42. TROUBLESHOOTING FOR UNIT MAINTENANCE
TEST OR INSPECTION
Step 6. Refer to wiring diagram (FO-1). Check for broken and loose connections.
3. LlTTLE OR NO HEATING IN LOW HEAT MODE
Step 1. Check that controls are properly positioned for LO HEAT operation
Position controls for LO heat operation.
Step 2. Check for air movement out of air outlet louver and into return air inlet.
This unit can operate in temperatures as low as 50F (10 C). However, depending on
shelter or van size, heat loss, and amount of heat generated by equipment, heat output
in the LO HEAT mode may or may not heat shelter or van to a comfortable level.
Remove obstructions from air inlets/outlets.
Step 3. Compare discharge air temperature to return air temperature by:
Turn mode selector switch to LO HEAT and temperature selector to maximum
After operating for 5 minutes, measure return air temperature and discharge air
Discharge air temperature should be at least 10F (12.2C) above return air temperature.