Greenheck DG / DGX with Direct Spark (470652) - Manual (Page 30)

Direct Spark Ignition Make-Up Air 30
®
Heater Does Not Operate
Attempts to light, but no flame (Visible spark)
Troubleshooting
Check inlet gas pressure.
(Direct Gas Start-Up Step #1)
Is the low fire set properly
(Direct Gas Start-Up Step #6)
Gas pressure between the
minimum and maximum 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 in.)
Defective spark plug
(Replace spark plug)
Pressure drop across the burner
between 0.625 and 0.675 in. wg?
Adjust burner baffles
(Reference Direct Gas Start-Up Step #3)
Check burner pressure drop
(Direct Gas Start-Up Step #3)
Air in the gas line?
Purge gas line
No
Yes
No
No
Yes
Yes
No
Yes
With proper airflow, gas pressure and spark,
the unit should light.
If problems remain, consult the factory
Adjust the low fire setting
(Reference Direct Gas Start-Up Step #6)
No
Yes