Manuals / Vulcan-Hart / Kitchen Appliance / Electric Steamer

Vulcan-Hart ML-126853, ML-126857, VHX24E5 Relay Board, Layout, Legend & Diagnostic Test Points

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

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VHX SERIES STEAMER - ELECTRICAL OPERATION

RELAY BOARD

Layout, Legend & Diagnostic Test Points

The relay board provides a centralized location for wire harness connections and power transfer through board relays (K1-K4) to the other steamer controls. Also, provides for condition or component troubleshooting by utilizing seven voltage test points (T1-T7) on the board to verify the voltage status for the condition or component in the operating sequence. When the condition for the component<s voltage measurement is satisfied or activated, 120VAC can be measured between T1 (ref.) and T2 thru T7 test points to indicate whether the condition or component is receiving voltage to energize and operate. If the voltage is not present, then the condition or component has not been energized or is not activated.

Page 31 of 48		F25154 (February 2004)

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Vulcan-Hart ML-126853, ML-126857, VHX24E5, MHB24E, ML-126852 manual Relay Board, Layout, Legend & Diagnostic Test Points

Contents

VHX24E ML-126852 VHX24E5 ML-126853 VHX BOILER BASE SERIES HIGH EFFICIENCYELECTRIC STEAMER VHX24E SHOWN NOTICETABLE OF CONTENTS F25154 February VHX SERIES STEAMERSVULCAN Page 3 ofSteam Cooking INSTALLATION, OPERATION AND CLEANINGGENERAL INTRODUCTIONBoiler Pressure SPECIFICATIONSWATER CONDITIONING Boiler Code DescriptionsSpecial TOOLSElectrical StandardPRESSURE 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 Handle COOKING COMPARTMENT DOORSRemoval GasketLatch Assembly Inspection SERVICE PROCEDURES AND ADJUSTMENTSClean-Out BOILERWATER 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 AdjustmentELECTRICAL OPERATION Reset Switch ManualCycling Pressure Switch High Limit Pressure SwitchSteam Solenoid Valve Compartment Pressure SwitchCOOKING COMPARTMENT CONTROLS Blowdown/DrainBoiler Base Controls COMPONENT LOCATIONSF25154 February Boiler Base Controls ContinuedVHX SERIES STEAMER - ELECTRICAL OPERATION Page 27 ofPage 28 of Cooking Compartment ControlsVHX SERIES STEAMER - ELECTRICAL OPERATION F25154 FebruaryLow Level Cut-Off& Differential Control WATER LEVEL CONTROLSAuxiliary Low Level Cut-Off RELAY BOARD Layout, Legend & Diagnostic Test PointsPage 32 of SchematicVHX SERIES STEAMER - ELECTRICAL OPERATION F25154 FebruaryInitial Fill and Preheat SEQUENCE OF OPERATIONBoiler Blowdown/drain Water Refill After Initial FillVHX SERIES STEAMER - ELECTRICAL OPERATION 4.Time expires on timer5.Timer manually turned off A.Contacts 1/4 open B.Alarm Buzzer de-energizedand stops buzzingF25154 February SCHEMATICSVHX SERIES STEAMER - ELECTRICAL OPERATION Boiler Base ControlsF25154 February VHX SERIES STEAMER - ELECTRICAL OPERATIONCooking Compartment Controls Page 37 ofF25154 February WIRING DIAGRAMSVHX SERIES STEAMER - ELECTRICAL OPERATION Boiler Base ControlsPage 39 of VHX SERIES STEAMER - ELECTRICAL OPERATIONF25154 February Page 40 of Heating Element CircuitsVHX SERIES STEAMER - ELECTRICAL OPERATION F25154 FebruaryF25154 February VHX SERIES STEAMER - ELECTRICAL OPERATIONCooking Compartment Controls Page 41 ofPOSSIBLE CAUSES TROUBLESHOOTINGSYMPTOM BOILER BASE CONTROLSSYMPTOM 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 DESCRIPTION CONDENSED SPARE PARTS LISTVHX24E, VHX24E5, MHB24E PART NUMBER