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Troubleshooting, Heater does not operate – Greenheck DG / DGX with Direct Spark (470652) User Manual

Page 30

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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