Vulcan-Hart ML-126852, ML-126857, ML-126853, VHX24E5, MHB24E manual Symptom Possible Causes

Page 44

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.

 

 

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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Contents VHX Boiler Base Series High Efficiency Electric Steamer VHX24E ShownTable of Contents VHX Series Steamers Model Number of Pans PAN Depth PER Compartment Inches INSTALLATION, Operation Cleaning IntroductionGeneral Specifications 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 Heating ElementsBoiler Assembly Right Side View ShownDescaler Cathodic Protector Cooking Compartment Doors RemovalGasket HandleLatch Assembly Service Procedures and Adjustments BoilerMain Water Level Control Water Level Probe Housing BlowdownWater Level Controls Test Auxiliary Low level Cut-Off Control Cycling Pressure Switch Adjustment High Limit Pressure Switch Adjustment Boiler Fill and Cold Water Condenser Solenoid ValvesCold Water Condenser Thermostat Adjustment Cooking Compartment Intake Shut-Off Valve Adjustment Steam FlowHeating Element Test Door Sealing Adjustment Door Latch AdjustmentReset Switch Manual Electrical OperationComponent Function Cold Water CondenserSteam Solenoid Valve Compartment Pressure SwitchBlowdown/Drain Component Locations Boiler Base ControlsBoiler Base Controls Cooking Compartment Controls Water Level Controls Low Level Cut-Off & Differential ControlAuxiliary Low Level Cut-Off Layout, Legend & Diagnostic Test Points Relay BoardSchematic Sequence of Operation Initial Fill and PreheatWater Refill After Initial Fill Boiler Blowdown/drainVHX Series Steamer Electrical Operation Schematics Cooking Compartment Controls Wiring Diagrams VHX Series Steamer Electrical Operation Heating Element Circuits Cooking Compartment Controls Boiler Base Controls TroubleshootingSymptom Possible Causes Symptom Possible Causes Symptom Possible Causes Cooking Compartment Controls VHX Series Steamer VHX Series Steamer Part Number Description Condensed Spare Parts ListVHX24E, VHX24E5, MHB24E
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