Manuals / Vulcan-Hart / Kitchen Appliance / Electric Steamer

Vulcan-Hart ML-126852, ML-126857 Vhx Series Steamer - Troubleshooting, Symptom, Possible Causes

Models: ML-126852 MHB24E VHX24E5 ML-126853 ML-126857

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VHX SERIES STEAMER - TROUBLESHOOTING

SYMPTOM		POSSIBLE CAUSES

Steamer on, boiler will not heat. Reset	1.	Reset switch malfunction.
switch activated, low water light and high	2.	Water Level Control malfunction.
pressure light not lit, ready light lit.	3.	Cycling pressure switch out of adjustment or malfunction.
	3.	Cycling pressure switch out of adjustment or malfunction.
	4.	High limit pressure switch out of adjustment or malfunction.
	5.	K3, K4 relays malfunction.
	6.	Relay board malfunction.
	7.	Contactor(s) malfunction.
	8.	Interconnecting wiring malfunction.

Pressure relief valve opening or leaking.	1.	Pressure relief valve malfunction.
	2.	Cycling pressure switch out of adjustment or malfunction.
	3.	High limit pressure switch out of adjustment or malfunction.

Steam output low or slow cooking.	1.	Cooking Compartments.
		A. Blocked steam injector ports. Open door, press door switch
		button and verify good steam flow into compartment.
		B. Steam solenoid valve clogged or malfunction.
		C. Steam intake shut-off valve not adjusted properly.
	2.	Boiler Base.
		A. Cycling pressure switch out of adjustment or malfunction.
		B. Steam header line (supply) blockage.
		C. Excessive amount of water in condensate tube loop from
		boiler to pressure controls.
		D. Pressure relief valve leaking.
		E. Excessive steam supply line leaks.

Steamer leaks water.	1.	Water, steam or drain line connections loose (top or base).
	2.	Heating element gasket not sealing.
	3.	Heating element mounting plate not sealing.
	4.	Gauge glass fittings loose.

Boiler water level too high, more than 1"	1.	Boiler fill valve malfunction.
visible in sight glass.	2.	Water level probes not wired correctly.
	3.	Lime scale build-up on HL probe.
	4.	Water level control malfunction.

Boiler does not fill or is slow to fill.	1.	Boiler fill water off or filtering system clogged.
	2.	Manual blowdown valve on water level probe housing open.
	3.	Boiler fill valve not receiving power, clogged or malfunction.
	4.	Boiler blowdown/drain valve clogged and not fully closing.
	5.	Air equalization tubes clogged.
	6.	Water level control malfunction.

F25154 (February 2004)		Page 44 of 48

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Vulcan-Hart ML-126852, ML-126857, ML-126853, VHX24E5, MHB24E Vhx Series Steamer - Troubleshooting, Symptom, Possible Causes

Contents

VHX BOILER BASE SERIES HIGH EFFICIENCY ELECTRIC STEAMERVHX24E SHOWN NOTICE VHX24E ML-126852 VHX24E5 ML-126853TABLE OF CONTENTS VHX SERIES STEAMERS VULCANPage 3 of F25154 FebruaryINSTALLATION, OPERATION AND CLEANING GENERALINTRODUCTION Steam CookingSPECIFICATIONS WATER CONDITIONINGBoiler Code Descriptions Boiler PressureTOOLS ElectricalStandard SpecialREMOVAL AND REPLACEMENT OF PARTS PRESSURE SWITCH CONTROL BOX COMPONENTSMAIN CONTROL BOX COMPONENTS WATER LEVEL GAUGE ASSEMBLY LEFT SIDE VIEW SHOWNHEATING ELEMENTS HEATING ELEMENT MOUNTING PLATE LEFT SIDE VIEW SHOWN BOILER ASSEMBLYRIGHT SIDE VIEW SHOWN LEFT SIDE VIEW SHOWN DESCALER Cathodic ProtectorLEFT SIDE VIEW SHOWN COOKING COMPARTMENT DOORS RemovalGasket HandleLatch Assembly SERVICE PROCEDURES AND ADJUSTMENTS Clean-OutBOILER InspectionMain Water Level Control WATER LEVEL PROBE HOUSING BLOWDOWNWATER LEVEL CONTROLS TEST Auxiliary Low level Cut-OffControl CYCLING PRESSURE SWITCH ADJUSTMENT HIGH LIMIT PRESSURE SWITCH ADJUSTMENT COLD WATER CONDENSER THERMOSTAT ADJUSTMENT COOKING COMPARTMENT Intake Shut-OffValve Adjustment Steam FlowHEATING ELEMENT TEST Door Sealing Adjustment Door Latch AdjustmentReset Switch Manual Cycling Pressure SwitchHigh Limit Pressure Switch ELECTRICAL OPERATIONCompartment Pressure Switch COOKING COMPARTMENT CONTROLSBlowdown/Drain Steam Solenoid ValveCOMPONENT LOCATIONS Boiler Base ControlsBoiler Base Controls Continued VHX SERIES STEAMER - ELECTRICAL OPERATIONPage 27 of F25154 FebruaryCooking Compartment Controls VHX SERIES STEAMER - ELECTRICAL OPERATIONF25154 February Page 28 ofWATER LEVEL CONTROLS Low Level Cut-Off& Differential ControlAuxiliary Low Level Cut-Off Layout, Legend & Diagnostic Test Points RELAY BOARDSchematic VHX SERIES STEAMER - ELECTRICAL OPERATIONF25154 February Page 32 ofSEQUENCE OF OPERATION Initial Fill and PreheatWater Refill After Initial Fill Boiler Blowdown/drain4.Time expires on timer 5.Timer manually turned off A.Contacts 1/4 openB.Alarm Buzzer de-energizedand stops buzzing VHX SERIES STEAMER - ELECTRICAL OPERATIONSCHEMATICS VHX SERIES STEAMER - ELECTRICAL OPERATIONBoiler Base Controls F25154 FebruaryVHX SERIES STEAMER - ELECTRICAL OPERATION Cooking Compartment ControlsPage 37 of F25154 FebruaryWIRING DIAGRAMS VHX SERIES STEAMER - ELECTRICAL OPERATIONBoiler Base Controls F25154 FebruaryF25154 February VHX SERIES STEAMER - ELECTRICAL OPERATIONPage 39 of Heating Element Circuits VHX SERIES STEAMER - ELECTRICAL OPERATIONF25154 February Page 40 ofVHX SERIES STEAMER - ELECTRICAL OPERATION Cooking Compartment ControlsPage 41 of F25154 FebruaryTROUBLESHOOTING SYMPTOMBOILER BASE CONTROLS POSSIBLE CAUSESPOSSIBLE CAUSES VHX SERIES STEAMER - TROUBLESHOOTINGSYMPTOM POSSIBLE CAUSES VHX SERIES STEAMER - TROUBLESHOOTINGSYMPTOM POSSIBLE CAUSES COOKING COMPARTMENT CONTROLSSYMPTOM Page 46 of VHX SERIES STEAMERF25154 February F25154 February VHX SERIES STEAMERPage 47 of CONDENSED SPARE PARTS LIST VHX24E, VHX24E5, MHB24EPART NUMBER DESCRIPTION