Water Level Controls Main or Auxiliary Llco | Vulcan-Hart MHB24G

VHX SERIES STEAMERS - REMOVAL AND REPLACEMENT OF PARTS

Cooking Compartment Controls

WATER LEVEL CONTROLS (MAIN OR AUXILIARY LLCO)

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.

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

3.Disconnect lead wires from the board being replaced.

4.Compress the locking tab on the board mounting "standoffs" and remove the water level control.

5.Reverse procedure to install and check for proper operation.

RELAY BOARD

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.

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

3.Disconnect all lead wires from the board.

4.Compress the locking tab on the board mounting "standoffs" and remove the relay board.

5.Reverse procedure to install and check for proper operation.

Page 15 of 68		F24700 (October 2001)

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Vulcan-Hart MHB24G, VHX24G5 manual Water Level Controls Main or Auxiliary Llco, Relay Board, Cooking Compartment Controls

Contents

VHX24G Shown VHX Boiler Base Series High Efficiency GAS Steamers Table of Contents VHX Series Steamers Installation Maintenance Cleaning IntroductionGeneral Boiler Control Styles Electrical Water Conditioning SpecificationsSystem Water Supply Special ToolsGas Supply Standard VHX Series Steamers Operation Steamer OperationCabinet Base Boiler Cooking Compartment Controls Boiler Blowdown Steamer Shut OFF Ignition Control Module Component FunctionVHX Series Steamers Component Function Blowdown/Drain Pressure Relief Valve Steam Header AssemblyWater Level Water Inlet Valve manual Steam Supply Manifold Compartment Pressure SwitchSteam Solenoid Valve Manifold Pressure Gauge Cabinet Base Boiler Controls Removal and Replacement of PartsVHX Series Steamers Removal and Replacement of Parts Component Locations Cabinet Base Boiler Controls Water Level Controls Main or Auxiliary Llco Relay BoardCooking Compartment Controls Water Level Gauge Assembly Pressure SwitchesBoiler Assembly Boiler Fill and Cold Water Condenser Solenoid Valves Pilot GAS Valve Main GAS Valve Complete Burner Assembly Burner Head Assembly Heat Exchanger VHX Series Steamers Removal and Replacement of Parts Cooking Compartment Doors RemovalGasket Handle Latch Assembly Inspection Service Procedures and AdjustmentsClean-Out Boiler Descaler Cathodic Protector Water Level Probe Housing Blowdown Test Water Level Controls Auxiliary Low level Cut-Off Control Cycling High Limit Small increments Fill and Cold Water Solenoid Valves Boiler BLOWDOWN/DRAIN Solenoid Valve Inline Water Strainer Cleaning Main Burner Ignition Checks Pressure Switch Adjustment GAS 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 Checks Spark Verification Test Cooking Compartment Doors Intake Shut-Off Valve Adjustment Steam FlowDoor Sealing Adjustment Cooking Compartment VHX Series Steamer Electrical Operation Door Latch Adjustment Low Level Cut-Off & Differential Control Electrical Operation Auxiliary Low Level Cut-Off LED Legend Board Layout and LED Legend Aux Water Level Satisfied State B Boiler Operational Status LED IndicatorReset Engaged State C Initial Conditions State a Burner ON, Boiler Heating to generate steam State E Air Pressure Switch Satisfied State DK32 Close K51 Close HL-LED Sequence of OperationNEW Style Controls Boiler Initial Fill and Preheat N14, N16, N17 go out N9, N10, N11, N12, N13 go out Boiler Blowdown/drain Water Refill After Initial Fill VHX Series Steamer Electrical Operation Cooking Compartment Controls This page Intentionally Left Blank Models Built After 5/25/00 New Style Boiler Controls Schematics VHX 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 Troubleshooting VHX Series Steamer TroubleshootingBoiler Base Controls Symptom Possible Causes Adjustments Boiler blowdown solenoid valve clogged and not fully closing Boiler Base Procedures and Adjustments VHX Series Steamer Condensed Spare Parts List VHX Series Steamer Condensed Spare Parts ListNEW Style Controls only VHX24G, VHX24G5, MHB24G