Greenheck DGK (468695) - Manual (Page 12)

12
24 VAC on the secondary of the
main transformer (TR1)
(measure across A1-A2 on
supply blower contactor)
Check Main Voltage
(See Blower Start-Up Step #1)
Main Disconnect (DS1) Off
(Turn Main Disconnect DS1 On)
Main Transformer (TR1) Defective
(Replace Transformer TR1)
Supply starter (ST1) energized?
Supply Fan Overload (ST1 OL) Tripped
(Reset and check motor amps, reference Blower Start-Up Step #4)
One or more legs of 3 phase is out
(Restore missing legs)
Supply Starter Defective
No
No
Yes
Note: At this time the supply contactor (ST1) should pull in passing
power to the supply motor and the blower should start.
Yes
Blower Does Not Operate
Broken Fan Belt
(Replace. Reference V-Belt Drives in Maintenance section)
Defective motor or capacitor
(Repair/Replace)
Internal motor overload tripped (optional)
(Check motor amps, reference Blower Start-Up Step #4)
Is power passing through the
heating inlet air sensor (TS1)?
Heating Inlet Air Senor (TS1) Holding
(Adjust TS1 setting, reference Blower Start-Up Step #6)
Is power passing through
the high limit (HLC1)?
High Limit (HLC1) Tripped
(Reset/Replace High Limit (HLC1))
(Check on cause of control loss)
Is power passing through the
airflow switch (PS2)?
Airflow Switch (PS2) Holding for Proper Airflow
(Correct airflow across burner, reference Direct Gas Start-Up Step #2)
No
No
No
Yes
Yes
Yes
At this time the heater should attempt to light
Heater Does Not Operate
Does not attempt to light. No visible spark.
Troubleshooting
Model DGK Make-Up Air
®