Boiler Base | Vulcan-Hart VHX24G5, MHB24G manual

VHX SERIES STEAMER - TROUBLESHOOTING

SYMPTOM			POSSIBLE CAUSES

Steam output low or slow cooking.	1.	Cooking Compartment.
		A. Blocked steam injector ports. (Open door, press door
			switch button and verify good steam flow into
			compartment).
		B. Steam solenoid valve not fully opening or blocked.
		C. Steam intake shut-off valve closed or out of adjustment.
			See "INTAKE SHUT-OFF VALVE ADJUSTMENT (STEAM
			FLOW)" in "SERVICE PROCEDURES AND
			ADJUSTMENTS".
	2.	Boiler Base.
		A. Cycling pressure switch malfunction or needs adjustment.
		B. Steam header line (supply) blockage.
		C. Heavy amount of condensate in the pressure controls
			steam supply line.
		D. Pressure relief valve leaking.
		E. Steam supply lines leaking badly.

Steamer leaks water.	1.	Loose water, steam or drain line connections (top or base).
	2.	Heat exchanger gasket not sealing.
	3.	Leak at gauge glass.

Boiler water level too high.	1.	Fill solenoid does not shut off.
	2.	Lime scale build-up (moist) on High level probe (open circuit).
	3.	Water level control malfunction.

Boiler does not fill.	1.	Water supply not on.
	2.	Fill solenoid not opening or plugged.
	3.	Water level control malfunction.

Burner won’t light.	1.	Gas not on.
	2.	Power/reset switch assembly malfunction.
	3.	Boiler not filling - check fill solenoid for power, clogging or
		malfunction.
	4.	Air pressure switch:
		A. Not mounted in true vertical position.
		B.	Incorrect pressure setting.
		C.	Malfunctioning switch.
	5.	Ignition module not receiving power.
	6.	Steamer not properly grounded and/or polarity of incoming
		power is incorrect on spark ignition systems.
	7.	Ignition module malfunction.
	8.	Gas valve malfunction.
	9.	Water too "pure" for probes to properly conduct electricity.
	10.	Cycling pressure switch open or set too high. Steamer is
		cycling on high limit.
	11.	High limit pressure switch open and not re-setting
		(malfunction).
	12.	Water level control malfunction.
	13.	Aux. water level control malfunction.

Page 65 of 68		F24700 (October 2001)

Image 65

Vulcan-Hart VHX24G5, MHB24G manual Boiler Base

Contents

VHX24G Shown VHX Boiler Base Series High Efficiency GAS Steamers Table of Contents VHX Series Steamers General InstallationMaintenance Cleaning Introduction Boiler Control Styles System Water Conditioning SpecificationsWater Supply Electrical Gas Supply ToolsStandard Special Cabinet Base Boiler Steamer OperationCooking Compartment Controls VHX Series Steamers Operation Boiler Blowdown Steamer Shut OFF VHX Series Steamers Component Function Component FunctionBlowdown/Drain Ignition Control Module Water Level Steam Header AssemblyWater Inlet Valve manual Pressure Relief Valve Steam Solenoid Valve Compartment Pressure SwitchManifold Pressure Gauge Steam Supply Manifold VHX Series Steamers Removal and Replacement of Parts Removal and Replacement of PartsComponent Locations Cabinet Base Boiler Controls Cabinet 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 Valve Complete Burner Assembly Burner Head Assembly Heat Exchanger VHX Series Steamers Removal and Replacement of Parts Gasket Cooking Compartment DoorsRemoval Handle Latch Assembly Clean-Out Service Procedures and AdjustmentsBoiler Inspection 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 Door Sealing Adjustment Intake Shut-Off Valve Adjustment Steam FlowCooking Compartment Cooking Compartment Doors 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 Reset Engaged State C Boiler Operational Status LED IndicatorInitial Conditions State a Aux Water Level Satisfied State B K32 Close Air Pressure Switch Satisfied State DK51 Close Burner ON, Boiler Heating to generate steam State E NEW Style Controls Boiler Sequence of OperationInitial Fill and Preheat HL-LED 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 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