Vulcan-Hart VHX24G5, MHB24G manual Pilot GAS Valve Main GAS Valve

Page 17

VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS

a.From the bottom right side, raise the boiler two to three inches so it tilts to the left. When the remaining water has drained out, lower the boiler before. proceeding.

B.Remove the drain/scale clean-out plug from the bottom of the boiler.

6.Slide the boiler forward and remove it from base frame.

7.Install a new boiler and secure it to frame.

8.Refer to "HEAT EXCHANGER" and perform steps 13 through 15.

9.Reconnect all steam, water, drain and power connections and check for proper operation.

BOILER FILL AND COLD WATER CONDENSER SOLENOID VALVES

WARNING: ALL GAS JOINTS DISTURBED DURING SERVICING MUST BE CHECKED FOR LEAKS. CHECK WITH A SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME.

NOTE: Gas combination control valves are not serviceable and should not be disassembled. Once the problem has been isolated to this component, replace it. Do not attempt to repair the assembly.

1.Open the cabinet door to access the Pilot gas valve.

2.Disconnect the lead wires.

3.Remove pilot gas tubing from the top of the valve (outlet side).

4.Remove the valve from the gas supply piping.

5.Reverse procedure to install and adjust pilot pressure as outlined under "GAS PILOT PRESSURE ADJUSTMENT" in "SERVICE PROCEDURES AND ADJUSTMENTS".

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.

1.Turn off the water supply to the steamer.

2.Open the cabinet base door and remove the cover from the pressure switch control box to access the solenoid valves. Both solenoid valves are located side by side at the rear of the box with the boiler fill near the bottom and the cold water condenser near the middle. Refer to "CABINET BASE BOILER CONTROLS" under "COMPONENT LOCATIONS" in “REMOVAL AND REPLACEMENT OF PARTS”.

3.Disconnect the power lead wires from the solenoid valve being serviced.

4.Disconnect the water lines for the valve being serviced and remove the valve.

5.Reverse procedure to install.

PILOT GAS VALVE

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.

MAIN GAS VALVE

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 SUPPLY BEFORE SERVICING THE UNIT.

WARNING: ALL GAS JOINTS DISTURBED DURING SERVICING MUST BE CHECKED FOR LEAKS. CHECK WITH A SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME.

NOTE: Gas combination control valves are not serviceable and should not be disassembled. Once the problem has been isolated to this component, replace it. Do not attempt to repair the assembly.

1.Open the cabinet base door to access the main gas valve.

2.Disconnect the lead wires.

3.Separate the union above the gas valve (outlet side).

4.Remove the valve from the gas supply piping.

5.Reverse procedure to install and adjust manifold pressure as outlined under "GAS MANIFOLD PRESSURE ADJUSTMENT" in

"SERVICE PROCEDURES AND ADJUSTMENTS".

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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 General InstallationMaintenance Cleaning Introduction Boiler Control Styles System Water Conditioning SpecificationsWater Supply ElectricalGas Supply ToolsStandard SpecialCabinet Base Boiler Steamer OperationCooking Compartment Controls VHX Series Steamers OperationBoiler Blowdown Steamer Shut OFF VHX Series Steamers Component Function Component FunctionBlowdown/Drain Ignition Control ModuleWater Level Steam Header AssemblyWater Inlet Valve manual Pressure Relief ValveSteam Solenoid Valve Compartment Pressure SwitchManifold Pressure Gauge Steam Supply ManifoldVHX Series Steamers Removal and Replacement of Parts Removal and Replacement of PartsComponent Locations 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 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 Gasket Cooking Compartment DoorsRemoval Handle Latch AssemblyClean-Out Service Procedures and AdjustmentsBoiler InspectionDescaler 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 Door Sealing Adjustment Intake Shut-Off Valve Adjustment Steam FlowCooking Compartment Cooking Compartment DoorsVHX Series Steamer Electrical Operation Door Latch AdjustmentLow Level Cut-Off & Differential Control Electrical OperationAuxiliary Low Level Cut-Off LED Legend Board Layout and LED LegendReset Engaged State C Boiler Operational Status LED IndicatorInitial Conditions State a Aux Water Level Satisfied State BK32 Close Air Pressure Switch Satisfied State DK51 Close Burner ON, Boiler Heating to generate steam State ENEW Style Controls Boiler Sequence of OperationInitial Fill and Preheat HL-LEDN14, 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 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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