Vulcan-Hart VHX24G5, MHB24G manual Spark Verification Test

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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)

 

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Contents VHX Boiler Base Series High Efficiency GAS Steamers VHX24G ShownTable of Contents VHX Series Steamers General InstallationMaintenance Cleaning Introduction Boiler Control Styles Water Supply Water Conditioning SpecificationsSystem ElectricalStandard ToolsGas Supply SpecialCooking Compartment Controls Steamer OperationCabinet Base Boiler VHX Series Steamers OperationBoiler Blowdown Steamer Shut OFF Blowdown/Drain Component FunctionVHX Series Steamers Component Function Ignition Control ModuleWater Inlet Valve manual Steam Header AssemblyWater Level Pressure Relief ValveManifold Pressure Gauge Compartment Pressure SwitchSteam Solenoid Valve Steam Supply ManifoldComponent Locations Removal and Replacement of PartsVHX Series Steamers Removal and Replacement of Parts Cabinet Base Boiler ControlsCabinet Base Boiler Controls Cooking Compartment Controls Water Level Controls Main or Auxiliary LlcoRelay Board Boiler Assembly Water Level Gauge AssemblyPressure Switches Pilot GAS Valve Main GAS Valve Boiler Fill and Cold Water Condenser Solenoid ValvesBurner Head Assembly Complete Burner AssemblyHeat Exchanger VHX Series Steamers Removal and Replacement of Parts Gasket Cooking Compartment DoorsRemoval Latch Assembly HandleBoiler Service Procedures and AdjustmentsClean-Out InspectionWater Level Probe Housing Blowdown Descaler Cathodic ProtectorWater Level Controls TestAuxiliary Low level Cut-Off Control High Limit CyclingFill and Cold Water Solenoid Valves Small incrementsInline Water Strainer Cleaning Boiler BLOWDOWN/DRAIN Solenoid ValvePressure Switch Adjustment Main Burner Ignition ChecksGAS Manifold Pressure Adjustment VHX Series Steamer Service Procedures and Adjustments AIR Pressure Switch Adjustment GAS Pilot Pressure Adjustment Pressure Readings Inches W.C GAS Manifold Pressure Adjustment Ignition Control Module Checks TerminalsSpark Verification Test Cooking Compartment Intake Shut-Off Valve Adjustment Steam FlowDoor Sealing Adjustment Cooking Compartment DoorsDoor Latch Adjustment VHX Series Steamer Electrical OperationElectrical Operation Low Level Cut-Off & Differential ControlAuxiliary Low Level Cut-Off Board Layout and LED Legend LED LegendInitial Conditions State a Boiler Operational Status LED IndicatorReset Engaged State C Aux Water Level Satisfied State BK51 Close Air Pressure Switch Satisfied State DK32 Close Burner ON, Boiler Heating to generate steam State EInitial Fill and Preheat Sequence of OperationNEW Style Controls Boiler HL-LEDN9, N10, N11, N12, N13 go out N14, N16, N17 go outWater Refill After Initial Fill Boiler Blowdown/drainVHX Series Steamer Electrical Operation Cooking Compartment Controls This page Intentionally Left Blank Schematics Models Built After 5/25/00 New Style Boiler ControlsVHX Series Steamer Electrical Operation Models Built Before 5/25/00 Old Style Boiler Controls Cooking Compartment Controls Wiring Diagrams VHX Series Steamer Electrical Operation Models Built Before 5/25/00 Old Style Boiler Controls VHX Series Steamer Electrical Operation Cooking Compartment Controls Boiler Base Controls TroubleshootingVHX Series Steamer Troubleshooting Symptom Possible Causes Adjustments Boiler blowdown solenoid valve clogged and not fully closing Boiler Base Procedures and Adjustments VHX Series Steamer NEW Style Controls only VHX24G, VHX24G5, MHB24G Condensed Spare Parts ListVHX Series Steamer Condensed Spare Parts List
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