Vulcan-Hart MHB24G, VHX24G5 Water Level Gauge Assembly, Pressure Switches, Boiler Assembly

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VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS

WATER LEVEL GAUGE

ASSEMBLY

1)Remove the mounting screws on the back side of the control box and lift out the pressure switch. Proceed to step 5.

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.Open the cabinet base door and remove the right side panel.

2.Close the valve at the top and at the bottom of the gauge assembly.

3.Unscrew the packing nuts at the top and bottom of the glass tube.

4.Slide the glass tube upwards until the bottom of the tube is clear of the fitting and lift it out.

NOTE: Clean tube if dirty or clogged and replace if damaged or broken.

NOTE: Do not over tighten the packing nuts or gauge glass may break.

5.Install the tube using new sealing washers.

6.Open the top and bottom valves.

7.Turn the power switch ON and allow boiler to come up to pressure.

8.Check gauge glass for water/steam leaks and if necessary, gradually tighten packing nuts until leak stops.

PRESSURE SWITCHES

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.Open the cabinet base door and remove the left side panel.

2.Remove the cover from the pressure switch control box to access the pressure switches. Refer to "CABINET BASE BOILER CONTROLS" under "COMPONENT LOCATIONS" in "REMOVAL AND REPLACEMENT OF PARTS".

3.The pressure switches are located at the bottom of the box. The pressure switch on the left is the cycling or primary control; the one on the right is the high limit control.

4.If replacing:

A.Cycling control - remove cover from pressure switch and disconnect the lead wires.

B.High limit control - disconnect the lead wires.

5.Disconnect the pressure fittings at the bottom of the switch.

6.Preset the new pressure switch to the approximate cut-out (OFF) and cut-in (ON) set points before installing. Refer to "PRESSURE SWITCHES" in "SERVICE PROCEDURES AND ADJUSTMENTS".

7.Reverse procedure to install.

8.Adjust the pressure switch(s) final set points as outlined under "PRESSURE SWITCHES" in

"SERVICE PROCEDURES AND ADJUSTMENTS".

BOILER ASSEMBLY

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.

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.

1.Blowdown the boiler and, if necessary, allow to cool.

2.Disconnect the steam supply line, power leads and drain lines from the cooking compartment top to the boiler base.

3.Refer to "HEAT EXCHANGER" and perform steps 3 through 12A.

4.Remove bolts securing the boiler to frame.

5.Drain any remaining water from the boiler. A. The suggested methods are:

1)Where the drain line exits the boiler on the lower left side, separate the drain line union.

2)Remove the access panel between the boiler and the cooking compartment on the right side.

3)Disconnect the steam supply hose from the cooking compartment steam manifold.

F24700 (October 2001)

 

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Contents VHX Boiler Base Series High Efficiency GAS Steamers VHX24G ShownTable of Contents VHX Series Steamers Maintenance Cleaning Introduction InstallationGeneral Boiler Control Styles Water Conditioning Specifications SystemWater Supply ElectricalTools Gas SupplyStandard SpecialSteamer Operation Cabinet Base BoilerCooking Compartment Controls VHX Series Steamers OperationBoiler Blowdown Steamer Shut OFF Component Function VHX Series Steamers Component FunctionBlowdown/Drain Ignition Control ModuleSteam Header Assembly Water LevelWater Inlet Valve manual Pressure Relief ValveCompartment Pressure Switch Steam Solenoid ValveManifold Pressure Gauge Steam Supply ManifoldRemoval and Replacement of Parts VHX Series Steamers Removal and Replacement of PartsComponent Locations Cabinet Base Boiler ControlsCabinet Base Boiler Controls Relay Board Water Level Controls Main or Auxiliary LlcoCooking Compartment Controls Pressure Switches Water Level Gauge AssemblyBoiler Assembly 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 Removal Cooking Compartment DoorsGasket Latch Assembly HandleService Procedures and Adjustments Clean-OutBoiler 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 Intake Shut-Off Valve Adjustment Steam Flow Door Sealing AdjustmentCooking Compartment 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 LegendBoiler Operational Status LED Indicator Reset Engaged State CInitial Conditions State a Aux Water Level Satisfied State BAir Pressure Switch Satisfied State D K32 CloseK51 Close Burner ON, Boiler Heating to generate steam State ESequence of Operation NEW Style Controls BoilerInitial Fill and Preheat 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 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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