Heater - Greenheck DGX Installation, Operation And Maintenance Manual

Troubleshooting
Heater Does Not Operate
Does not attempt to light (No visible spark)
24 VAC between
terminals W1 and X?
Yes
115 VAC between
terminals 102 and 101?
Yes
115 VAC between
terminals 103 and 101?
Yes
115 VAC between
terminals 104 and 101?
Yes
115 VAC between
terminals 106 and 101?
Yes
Continuity between
terminals 107 and 108?
Yes
®
No
No
Main Transformer (TR4) Defective
No
(Optional) Inlet Air Sensor (TS4) Holding
(Adjust TS4 setting. Reference Blower Start-Up – Step #6)
The power light on the flame safeguard should
blink approximately every 5 seconds as it
performs a self-diagnostics check.
No
No
(Optional) High/Low Gas Pressure Switch(es)
(Reference Direct Gas Start-Up – Steps #2 and #3)
No
Airflow Switch (PS2) Holding for Proper Airflow
(Reference Direct Gas Start-Up – Step #4a or 4b)
At this time the heater should attempt to light.
(The pilot light on the flame safeguard should illuminate).
Heat Switch (S4) Off
(Turn Heat Switch (S4) On)
Heat Switch Not Wired
(Wire Heat Switch (S4))
Primary Fuses Blown
(Replace Fuses)
(Replace Transformer)
Heat Relay (RH) Defective
(Replace Heat Relay (RH))
High Limit (HLC1) Tripped
(Reset/Replace High Limit (HLC1))
(Check on cause of control loss)
(PS3 and PS4) Tripped
(Correct gas pressure and reset)
(Correct airflow across burner)
DGX Industrial Space Heating 21