Service manual

NO FAN OPERATION ON DJM-3
Dip switch #5 should be in off position.
24 VAC on T
1
T
2
Yes No
Is heat call light SOLID ON upon
call for heat?
Yes No
Fan will start 30 seconds
but fan doesn’t start
No Yes
If burner fires for 30 seconds
but fan doesn’t start
Fan should start after 30 seconds
Yes No
- Restore power
- Check line voltage
Unit is in night mode and
fan operation is
intermittent. Fans runs with
respect to room heat call
Normal Operation
Replace DJM-3
- Units is in OFF position
- Restore unit to ON status
Problem is external to DJM-3. Check
fan motor contractor or motor may be
faulty. Check other interrupting contact
as per unit internal wiring diagram.
Is 24 VAC on N to K terminals?
Yes No
Is 24 VAC on N to FS terminals?
Yes No
Fan should start after 30 seconds
Yes No
Is power 24 VAV on N to SA?
Yes No