Manuals / Vulcan-Hart / Kitchen Appliance / Electric Steamer

Vulcan-Hart ML-126857, VHX24E5 Cooking Compartment Controls, Blowdown/Drain, Steam Solenoid Valve

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

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Blowdown/Drain

VHX SERIES STEAMER - ELECTRICAL OPERATION

Supply Voltage Transformer . . . . Provides 120VAC to the boiler control and cooking compartment control circuits.

Cycling Contactors B & D . . . . . . Supplies line voltage to one side of heating elements thru cycling pressure switch N.C. contacts and LLCO-1 N.O. contacts.

Auxiliary Contactors A & C . . . . . Supplies line voltage to energize the heating elements thru relay K3 & K4 N.O. contacts.

Heating Elements . . . . . . . . . . . . . Heats water in boiler to generate steam.

Blowdown/Drain

Solenoid Valve . . . . . . . . . . . . . . . N.O. valve that closes when energized by the power switch to allow boiler to fill and pressurize. When de-energized, valve opens to blowdown and drain the boiler contents.

COOKING COMPARTMENT CONTROLS

The upper section of the steamer consists of two separate cooking compartments. Each compartment functions independently with its own set of controls. Power is supplied to the controls only after the steam pressure rises above the compartment pressure switch setting to close the N.O. contacts.

Ready Light (Green)	When lit, indicates steamer is ready to cook.
Cooking Light (Red)	When lit, indicates steamer is in a cooking cycle.
Cooking Timer	Use to set cooking time between 0-60 minutes. When timer is set, energizes
	the steam solenoid valve to allow steam into the cooking compartment.
	When time expires, energizes buzzer until turned off.
Buzzer	Signals end of a cook cycle, must be turned off manually.
Door Switch	Removes power to cooking timer. If time is dialed on cooking timer and
	compartments are steaming, removes power to steam solenoid valve when
	compartment door is opened.
Steam Solenoid Valve	When energized, opens to allow steam into the cooking compartment
	(normally closed valve).
Compartment Pressure Switch . .	Supplies power to cooking compartment controls, after steam pressure rises
	above approximately 3 psi to close the pressure switch. The pressure switch
	remains closed as long as steam pressure is above the stated pressure.

Page 25 of 48		F25154 (February 2004)

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Vulcan-Hart ML-126857 Cooking Compartment Controls, Blowdown/Drain, Steam Solenoid Valve, Compartment Pressure Switch

Contents

ELECTRIC STEAMER VHX BOILER BASE SERIES HIGH EFFICIENCYVHX24E SHOWN NOTICE VHX24E ML-126852 VHX24E5 ML-126853TABLE OF CONTENTS VULCAN VHX SERIES STEAMERSPage 3 of F25154 FebruaryGENERAL INSTALLATION, OPERATION AND CLEANINGINTRODUCTION Steam CookingWATER CONDITIONING SPECIFICATIONSBoiler Code Descriptions Boiler PressureElectrical TOOLSStandard SpecialPRESSURE SWITCH CONTROL BOX COMPONENTS REMOVAL AND REPLACEMENT OF PARTSMAIN CONTROL BOX COMPONENTS LEFT SIDE VIEW SHOWN WATER LEVEL GAUGE ASSEMBLYHEATING ELEMENTS HEATING ELEMENT MOUNTING PLATE RIGHT SIDE VIEW SHOWN BOILER ASSEMBLYLEFT SIDE VIEW SHOWN LEFT SIDE VIEW SHOWN DESCALER Cathodic ProtectorLEFT SIDE VIEW SHOWN Removal COOKING COMPARTMENT DOORSGasket HandleLatch Assembly Clean-Out SERVICE PROCEDURES AND ADJUSTMENTSBOILER InspectionWATER LEVEL CONTROLS TEST WATER LEVEL PROBE HOUSING BLOWDOWNMain Water Level Control Auxiliary Low level Cut-OffControl CYCLING PRESSURE SWITCH ADJUSTMENT HIGH LIMIT PRESSURE SWITCH ADJUSTMENT COLD WATER CONDENSER THERMOSTAT ADJUSTMENT HEATING ELEMENT TEST Intake Shut-OffValve Adjustment Steam FlowCOOKING COMPARTMENT Door Latch Adjustment Door Sealing AdjustmentCycling Pressure Switch Reset Switch ManualHigh Limit Pressure Switch ELECTRICAL OPERATIONCOOKING COMPARTMENT CONTROLS Compartment Pressure SwitchBlowdown/Drain Steam Solenoid ValveBoiler Base Controls COMPONENT LOCATIONSVHX SERIES STEAMER - ELECTRICAL OPERATION Boiler Base Controls ContinuedPage 27 of F25154 FebruaryVHX SERIES STEAMER - ELECTRICAL OPERATION Cooking Compartment ControlsF25154 February Page 28 ofLow Level Cut-Off& Differential Control WATER LEVEL CONTROLSAuxiliary Low Level Cut-Off RELAY BOARD Layout, Legend & Diagnostic Test PointsVHX SERIES STEAMER - ELECTRICAL OPERATION SchematicF25154 February Page 32 ofInitial Fill and Preheat SEQUENCE OF OPERATIONBoiler Blowdown/drain Water Refill After Initial Fill5.Timer manually turned off A.Contacts 1/4 open 4.Time expires on timerB.Alarm Buzzer de-energizedand stops buzzing VHX SERIES STEAMER - ELECTRICAL OPERATIONVHX SERIES STEAMER - ELECTRICAL OPERATION SCHEMATICSBoiler Base Controls F25154 FebruaryCooking Compartment Controls VHX SERIES STEAMER - ELECTRICAL OPERATIONPage 37 of F25154 FebruaryVHX SERIES STEAMER - ELECTRICAL OPERATION WIRING DIAGRAMSBoiler Base Controls F25154 FebruaryPage 39 of VHX SERIES STEAMER - ELECTRICAL OPERATIONF25154 February VHX SERIES STEAMER - ELECTRICAL OPERATION Heating Element CircuitsF25154 February Page 40 ofCooking Compartment Controls VHX SERIES STEAMER - ELECTRICAL OPERATIONPage 41 of F25154 FebruarySYMPTOM TROUBLESHOOTINGBOILER BASE CONTROLS POSSIBLE CAUSESSYMPTOM VHX SERIES STEAMER - TROUBLESHOOTINGPOSSIBLE CAUSES SYMPTOM VHX SERIES STEAMER - TROUBLESHOOTINGPOSSIBLE CAUSES SYMPTOM COOKING COMPARTMENT CONTROLSPOSSIBLE CAUSES F25154 February VHX SERIES STEAMERPage 46 of Page 47 of VHX SERIES STEAMERF25154 February VHX24E, VHX24E5, MHB24E CONDENSED SPARE PARTS LISTPART NUMBER DESCRIPTION