Kees DFG (DIRECT FIRED GAS) MAKE-UP AIR UNITS - Manual (Page 10)

9
TROUBLE SHOOTING GUIDE
If a service problem should occur, the following guide can be used to isolate and correct
the problem.
IMPORTANT:
Before this heater will operate, the following conditions must be met and, therefore,
should be checked before proceeding to the steps of the "Trouble Shooting" section
herein.
1. Adequate supply of air into intake of the unit -- check for obstructions in intake
hood and filters.
2. Proper fuel pressure -- all supply valves open and proper gas pressure supplied
as stated on unit identification plate.
3. All circuit breakers and disconnects turned on and adequate electrical power to
unit.
A. BLOWER MOTOR FAILS TO START. REMEDY
Probable 1. Fuse blown in unit disconnect. Replace fuse.
Cause:
2. Motor starter out on overload. Press red reset button overload.
3. Remote switch in OFF position. Turn to summer or winter position.
4. Unit shut down on flame safety. Press reset button on flame
safety relay.
5. Unit shut down on low Re-energize power to low
temperature safety. Temperature limit by turning
power “OFF” and then “ON”.
6. Defective motor. Replace motor.
7. No power to motor starter Check preceding controls
coil. for open circuit.