Vulcan-Hart MHB24G Steam Solenoid Valve, Compartment Pressure Switch, Manifold Pressure Gauge

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VHX SERIES STEAMERS - COMPONENT FUNCTION

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 desired cooking cycle time between 0-60 minutes. When a
	timer is set, the steam supply solenoid valve is energized to allow steam
	into the cooking compartment but only after the boiler has reached its
	operating pressure. Also, energizes the buzzer when time expires.
Buzzer	Signals end of a cook cycle, must be turned off manually.
Door Switch	Removes electrical power to the timer. If time is dialed on the cooking
	timer and compartments are steaming, removes power to the steam
	solenoid valve when the 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 the controls only after the steam pressure rises above
	approximately 3 psi to close the compartment pressure switch. The
	switch remains closed as long as steam pressure stays above this
	pressure.
Manifold Pressure Gauge	Indicates the amount of steam pressure in manifold. The intake shut-off
	valve should be adjusted so manifold pressure remains at 9 psi with both
	compartments on.
Steam Supply Manifold	Main steam supply line from the boiler for each cooking compartment.
	Supplies steam up to the steam solenoid valve.
Intake Shut-Off Valve	Main steam supply shut-off from the boiler to the steam supply manifold.
	This valve should NOT be left fully OPEN to boiler steam supply. See
	“INTAKE SHUT-OFF VALVE ADJUSTMENT (STEAM FLOW)" in
	“SERVICE PROCEDURES AND ADJUSTMENTS".

F24700 (October 2001)		Page 12 of 68

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Contents VHX Boiler Base Series High Efficiency GAS Steamers VHX24G ShownTable of Contents VHX Series Steamers Installation Maintenance Cleaning IntroductionGeneral Boiler Control Styles Water Conditioning Specifications SystemWater Supply ElectricalTools Gas SupplyStandard SpecialSteamer Operation Cabinet Base BoilerCooking Compartment Controls VHX Series Steamers OperationBoiler Blowdown Steamer Shut OFF Component Function VHX Series Steamers Component FunctionBlowdown/Drain Ignition Control ModuleSteam Header Assembly Water LevelWater Inlet Valve manual Pressure Relief ValveCompartment Pressure Switch Steam Solenoid ValveManifold Pressure Gauge Steam Supply ManifoldRemoval and Replacement of Parts VHX Series Steamers Removal and Replacement of PartsComponent Locations Cabinet Base Boiler ControlsCabinet Base Boiler Controls Water Level Controls Main or Auxiliary Llco Relay BoardCooking Compartment Controls Water Level Gauge Assembly Pressure SwitchesBoiler Assembly Pilot GAS Valve Main GAS Valve Boiler Fill and Cold Water Condenser Solenoid ValvesBurner Head Assembly Complete Burner AssemblyHeat Exchanger VHX Series Steamers Removal and Replacement of Parts Cooking Compartment Doors RemovalGasket Latch Assembly HandleService Procedures and Adjustments Clean-OutBoiler InspectionWater Level Probe Housing Blowdown Descaler Cathodic ProtectorWater Level Controls TestAuxiliary Low level Cut-Off Control High Limit CyclingFill and Cold Water Solenoid Valves Small incrementsInline Water Strainer Cleaning Boiler BLOWDOWN/DRAIN Solenoid ValvePressure Switch Adjustment Main Burner Ignition ChecksGAS 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 Ignition Control Module Checks TerminalsSpark Verification Test Intake Shut-Off Valve Adjustment Steam Flow Door Sealing AdjustmentCooking Compartment Cooking Compartment DoorsDoor Latch Adjustment VHX Series Steamer Electrical OperationElectrical Operation Low Level Cut-Off & Differential ControlAuxiliary Low Level Cut-Off Board Layout and LED Legend LED LegendBoiler Operational Status LED Indicator Reset Engaged State CInitial Conditions State a Aux Water Level Satisfied State BAir Pressure Switch Satisfied State D K32 CloseK51 Close Burner ON, Boiler Heating to generate steam State ESequence of Operation NEW Style Controls BoilerInitial Fill and Preheat HL-LEDN9, N10, N11, N12, N13 go out N14, N16, N17 go outWater Refill After Initial Fill Boiler Blowdown/drainVHX Series Steamer Electrical Operation Cooking Compartment Controls This page Intentionally Left Blank Schematics Models Built After 5/25/00 New Style Boiler ControlsVHX 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