Vulcan-Hart VHX24G5, MHB24G manual Spark Verification Test

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

Spark Verification Test

1.Turn the power switch OFF.

2.Check to ensure that all electrical terminal connections on the ignition control module and the ignitor rod are clean and tight. If the ignition cable appears to be damaged, replace it and re-try lighting burner.

3.Verify that the ignition control module and the burner ground have a good ground connection.

A.If loose connections are found, make the necessary adjustments and check for proper operation.

B.If connections are ok but sparking does not occur, proceed to step 4.

4.Remove ignition cable boot from the ignitor rod terminal and check ignitor position in the burner head assembly.

A.Measure distance ignitor terminal extends past ignitor nut, approximately 3/4" to 7/8". See diagram 5898 "COMPLETE BURNER ASSEMBLY" under "MAIN BURNER IGNITION CHECKS”.

NOTE: Touch ignitor terminal only and not the ceramic insulator.

1)If distance is ok, proceed to step 5 and perform steps B thru E.

2)If distance is other than stated, loosen ignitor nut, set the ignitor position.

3)Re-connect ignition cable.

B.Turn the power switch ON and allow the boiler to fill.

C.Press reset switch to start the ignition process.

1)If pilot lights, then ignition system is working properly.

2)If ignitor does not spark, proceed to step 5.

5.Turn the power switch OFF.

A.Remove ignition cable boot from the ignitor rod terminal.

B.Grasp the ignitor terminal and rotate the ignitor approximately 45°.

NOTE: Touch ignitor terminal only and not the ceramic insulator.

C.Re-connect ignition cable.

D.Turn the power switch ON and allow the boiler to fill.

E.Press reset switch to start the ignition process.

1)If pilot lights, then ignition system is working properly.

2)If ignitor does not spark, repeat steps E thru this step until rod has been rotated 360°.

3)If ignitor still does not spark, proceed to step 6.

WARNING: SHUT OFF THE GAS BEFORE SERVICING THE UNIT.

6.Turn the power switch OFF.

7.Remove the burner head assembly as outlined under "BURNER HEAD ASSEMBLY" in

"REMOVAL AND REPLACEMENT OF PARTS" and check the following:

A.The gap between the spark probe and the ground pin should be approximately 0.090" to 0.100". Adjust as necessary. See diagram 5899 "BURNER HEAD ASSEMBLY" under "MAIN BURNER IGNITION CHECKS".

B.Inspect the ceramic flame rod insulator for cracks or evidence of exposure to extreme heat, which can permit leakage to ground. If either of these conditions exist, then replace ignitor rod and re-test.

1)If replacing ignitor rod, loosen the ignitor rod mounting nut and remove the ignitor rod from the burner head assembly.

WARNING: THE FOLLOWING STEPS REQUIRE POWER TO BE APPLIED TO THE UNIT DURING THE TEST. USE EXTREME CAUTION AT ALL TIMES.

8.Verify spark at electrode.

A.Place the assembly on the floor and attach a temporary ground wire from the burner ground on the heat exchanger to the burner head assembly.

B.Turn the power switch ON and press the reset switch.

C.Observe spark condition from ignitor.

1)If a good spark from ignitor is present then the ignition system is working properly.

2)If ignitor is still not sparking, replace the ignition control module and repeat steps 8A and 8B to check for proper operation.

3)After making the necessary component adjustments or replacements, re-assemble and check for proper operation.

F24700 (October 2001) Page 38 of 68