Vulcan-Hart VHX24G5, MHB24G Steamer Operation, Cabinet Base Boiler, Cooking Compartment Controls

Page 8

VHX SERIES STEAMERS - OPERATION

STEAMER OPERATION

CABINET BASE BOILER

Ensure that all utility connections to the steamer have been made and are turned ON and that the knob on the main gas valve is in the ON position.

The VHX Series steamers are CSD-1 compliant and are equipped with amber colored lights on the boiler control panel for High Pressure and Low Water level that illuminate and stay on until the boiler is full and the manual reset switch pressed.

1.Turn power switch ON.

A.Amber colored lights on the boiler control panel for High Pressure and Low Water level will illuminate. and stay on until the boiler is full and the reset switch is pressed.

B.Water will begin filling the boiler and the blowdown solenoid valve will close. The boiler should fill, in four to eleven minutes.

C.As water fills the boiler, observe water level gauge glass to verify that water is in boiler. See "WATER LEVEL GAUGE ASSEMBLY" in "COMPONENT FUNCTION” and COMPONENT LOCATION “ under "REMOVAL AND REPLACEMENT OF PARTS".

D.Once the water in the boiler reaches the minimum level, the green ready light on the boiler control panel will illuminate.

NOTE: If the fill has stopped, one visible inch of water should be in the gauge glass.

2.Press the reset switch on the boiler control panel.

A.Low water level safety circuit will be reset and the Low Water level light (amber) will turn off.

B.High pressure safety circuit will be reset and the High Pressure light (amber) will turn off.

C.Sparking will begin three seconds later to light the pilot burner.

1)If the pilot burner lights, a signal is sent back through the ignition cable indicating the presence of pilot burner flame and sparking stops.

2)If pilot burner flame is not established immediately, sparking will continue for 90 seconds. After that duration, the ignition control module will lock out and needs to be reset to start the pilot and main burner lighting cycle again.

New Style Controls - Power to the Pilot gas valve operates on a "timer" circuit allowing gas flow to the pilot for approximately 15 seconds, during ignition trial, then turns off.

D.Main gas valve opens, burner ignites and begins to heat the water in the boiler. After approximately 15 minutes, steam should be present for cooking product. Observe that the boiler pressure gauge indicates a steam pressure of 8-10 psi before the burner shuts OFF.

3.The cycling pressure switch will maintain steam pressure in the boiler by cycling the main burner ON and OFF.

COOKING COMPARTMENT

CONTROLS

When the steam pressure in the cooking compartment manifold reaches approximately 3 psi, the cooking compartment pressure switch closes, suppling power to the other cooking compartment controls. The ready lights will illuminate and after approximately one minute, the steam pressure in the boiler will reach the upper limit of 10 psi. If the pressure drops below approximately 3 psi, the pressure switch will open, removing power from the controls.

NOTE: On initial startup, if a cooking timer is set immediately after the ready light comes on, steam solenoid chattering will be heard (oil canning) and the ready lights will flash for several seconds. This condition is caused by the manifold steam pressure being on the “fringe” of the pressure switch set point. When a cook timer is set, the compartment steam solenoid valve opens causing the manifold steam pressure to drop, slightly below the pressure switch set point. At the same time, steam pressure is still increasing in the boiler. This opposing condition causes a pressure “bounce” to occur. After the steam pressure passes approximately 4 psi this condition subsides. During normal operation, this condition will not be seen.

F24700 (October 2001)

 

Page 8 of 68

 

Page 7 Page 9
Image 8
Page 7 Page 9
Contents VHX Boiler Base Series High Efficiency GAS Steamers VHX24G ShownTable of Contents VHX Series Steamers General InstallationMaintenance Cleaning Introduction 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 Cooking Compartment Controls Water Level Controls Main or Auxiliary LlcoRelay Board Boiler Assembly Water Level Gauge AssemblyPressure Switches 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 Gasket Cooking Compartment DoorsRemoval 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 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
Top Page Image Contents