Greenheck DGK (468695) - Manual (Page 14)

14
No
Check for proper pilot pressure.
(Direct Gas Start-Up)
Check inlet gas pressure.
(Direct Gas Start-Up)
Note: The minimum and maximum gas pressures
for your unit are shown on the direct gas label.
Gas pressure between the
min and max shown on
the direct gas label? Correct gas pressure
(Reference Direct Gas Start-Up Step #1)
Proper spark?
Crossed flame and spark wires
(Uncross wires and reconnect)
Incorrect spark plug gap
(Set spark plug gap to 0.062 inches)
Defective spark plug
(Replace spark plug)
Pressure drop across the burner
between 0.625 and 0.675 in. wc?
Adjust burner baffles
(Reference Direct Gas Start-Up Step #2)
Check for proper airflow
(Direct Gas Start-Up)
Note: The airflow may satisfy the airflow switch, but may
make lighting the pilot difficult. Adjust the pressure drop
across the burner to between 0.625 and 0.675 in. wg as
shown in Direct Gas Start-Up Step #2
Air in the gas line?
Purge gas line
(Verify gas at the pilot, reference Direct Gas Start-Up Step #3)
No
No
Yes
No
No
Yes
Yes
Yes
Yes
No
Note: A high pilot pressure will make lighting more difficult. Lower
the pilot pressure in increments until the unit lights. Then set the
pilot per the instruction in Direct Gas Start-Up Step #3)
Yes
Adjust the pilot pressure
(Reference Direct Gas Start-Up section)
Heater Does Not Operate — DGK-H25
Attempts to light but no visible pilot. Visible spark.
Pilot pressure correct?
Yes
With proper airflow, gas pressure and spark,
the unit should light.
If problems remain, consult the factory.
Troubleshooting
Model DGK Make-Up Air
®