Vulcan-Hart MHB24G, VHX24G5 manual GAS Manifold Pressure Adjustment

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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

a.If ignitor sparks and pilot lights, proceed to step 7.

b.If ignitor does not spark, proceed to step "5)" below.

5)Restart power ON sequence by "rapidly" turning the power switch OFF then back ON. A rapid switching is needed to keep the boiler from starting automatic blowdown.

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

b.Re-connect ignition cable.

6)Press the reset switch to start the ignition process.

a.If ignitor sparks and pilot lights, proceed to step 7.

b.If ignitor does not spark, repeat steps "5)" through this step until rod has been rotated 360°.

7.Verify main burner ignition.

A.If main burner lights and remains lit with no intermittent problems, then burner is functioning properly.

B.If main burner does not light or shows intermittent problems, then check the main burner pressure setting as outlined under

"GAS MANIFOLD PRESSURE ADJUSTMENT".

1)If pressure is ok but intermittent burner problems continue, then the following components must be examined.

2)Turn the power switch OFF and allow the boiler to blowdown.

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

WARNING: SHUT OFF THE GAS BEFORE SERVICING THE UNIT.

3)Remove burner head assembly as outlined under "BURNER HEAD ASSEMBLY" in "REMOVAL AND REPLACEMENT OF PARTS".

4)The complete or intermittent loss of burner ignition or a burner operation that is loud and noisy may indicate the burner tube insulation or heat exchanger casting is damaged.

Verify the burner tube insulation and heat exchanger casting are intact.

NOTE: The suggested method for inspection is to mount a small mirror to a 2 foot long rod and insert the mirror inside the burner tube and use a flashlight to illuminate the area.

NOTE: If necessary, the complete burner tube assembly can be removed to aid in performing the measurement and inspections.

a.Inspect the ceramic insulation for damage at the area around the burner head inside the burner tube.

b.Measure ceramic insulation insertion depth/location from the end of the insulation that surrounds the burner head to the opposite end of the burner tube (end plate mounting flange). The dimension should measure approximately 23 5/8 inches ±1/8. See diagram 5898

"COMPLETE BURNER ASSEMBLY" at the end of this procedure.

c.Verify that casting debris is not clogging the "heat transfer fins" at the end of heat exchanger casting and that the fins have not eroded away.

d.Inspect the interior of heat exchanger casting for signs of water leakage. Also, signs of water leakage into the heat exchanger casting may be determined by examining the bottom area of the flue transition piece and floor.

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F24700 (October 2001)

 

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Contents VHX24G Shown VHX Boiler Base Series High Efficiency GAS SteamersTable of Contents VHX Series Steamers Maintenance Cleaning Introduction InstallationGeneral Boiler Control Styles Electrical Water Conditioning SpecificationsSystem Water SupplySpecial ToolsGas Supply StandardVHX Series Steamers Operation Steamer OperationCabinet Base Boiler Cooking Compartment ControlsBoiler Blowdown Steamer Shut OFF Ignition Control Module Component FunctionVHX Series Steamers Component Function Blowdown/DrainPressure Relief Valve Steam Header AssemblyWater Level Water Inlet Valve manualSteam Supply Manifold Compartment Pressure SwitchSteam Solenoid Valve Manifold Pressure GaugeCabinet Base Boiler Controls Removal and Replacement of PartsVHX Series Steamers Removal and Replacement of Parts Component LocationsCabinet Base Boiler Controls Relay Board Water Level Controls Main or Auxiliary LlcoCooking Compartment Controls Pressure Switches Water Level Gauge AssemblyBoiler Assembly Boiler Fill and Cold Water Condenser Solenoid Valves Pilot GAS Valve Main GAS ValveComplete Burner Assembly Burner Head AssemblyHeat Exchanger VHX Series Steamers Removal and Replacement of Parts Removal Cooking Compartment DoorsGasket Handle Latch AssemblyInspection Service Procedures and AdjustmentsClean-Out BoilerDescaler Cathodic Protector Water Level Probe Housing BlowdownTest Water Level ControlsAuxiliary Low level Cut-Off Control Cycling High LimitSmall increments Fill and Cold Water Solenoid ValvesBoiler BLOWDOWN/DRAIN Solenoid Valve Inline Water Strainer CleaningMain Burner Ignition Checks Pressure Switch AdjustmentGAS 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 Terminals Ignition Control Module ChecksSpark Verification Test Cooking Compartment Doors Intake Shut-Off Valve Adjustment Steam FlowDoor Sealing Adjustment Cooking CompartmentVHX Series Steamer Electrical Operation Door Latch AdjustmentLow Level Cut-Off & Differential Control Electrical OperationAuxiliary Low Level Cut-Off LED Legend Board Layout and LED LegendAux Water Level Satisfied State B Boiler Operational Status LED IndicatorReset Engaged State C Initial Conditions State aBurner ON, Boiler Heating to generate steam State E Air Pressure Switch Satisfied State DK32 Close K51 CloseHL-LED Sequence of OperationNEW Style Controls Boiler Initial Fill and PreheatN14, N16, N17 go out N9, N10, N11, N12, N13 go outBoiler Blowdown/drain Water Refill After Initial FillVHX Series Steamer Electrical Operation Cooking Compartment Controls This page Intentionally Left Blank Models Built After 5/25/00 New Style Boiler Controls SchematicsVHX 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 VHX Series Steamer Troubleshooting TroubleshootingBoiler Base Controls Symptom Possible Causes Adjustments Boiler blowdown solenoid valve clogged and not fully closing Boiler Base Procedures and Adjustments VHX Series Steamer VHX Series Steamer Condensed Spare Parts List Condensed Spare Parts ListNEW Style Controls only VHX24G, VHX24G5, MHB24G
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