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

Page 43

VHX SERIES STEAMER - TROUBLESHOOTING

SYMPTOM

 

POSSIBLE CAUSES

 

 

 

Condenser drain box leaking.

1.

Grommets or cover panel gasket not sealing.

 

2.

Clog in drain line plumbing.

 

3.

Drain restricted due to drain pipe size below 1-1/4" NPT.

 

4.

Drain extension plumbing not at the proper slope or plumbing

 

 

too lengthy.

 

5.

Steamer drain not plumbed to an open air gap drain.

 

6.

Steamer draining while under pressure and relief valve opening

 

 

at the same time (flooding drain box).

 

7.

Cold water condenser spray is over spraying.

 

8.

Cold water condenser cycling thermostat out of adjustment or

 

 

malfunction.

 

 

 

Excessive steam vapors exiting from

1.

Water supply for cold water condenser line off or inline strainer

drain.

 

clogged.

 

2.

Cold water condenser solenoid not receiving power, clogged or

 

 

malfunction.

 

3.

Clogged spray nozzle (condenser drain box).

 

4.

Water supply pressure high; or high pressure in line due to

 

 

water hammer, causing improper valve operation.

 

5.

Cold water condenser thermostat out of adjustment or

 

 

malfunction.

 

 

 

Heat coming on without water in boiler

1.

Lime scale build-up on water level probes.

(Dry firing).

2.

Retention of water in probe housing (three probe assembly or

 

 

single AUX LLCO probe).

 

3.

Air equalization tubes clogged.

 

4.

Water level control malfunction.

 

5.

Auxiliary water level control malfunction.

 

6.

Reset switch malfunction.

 

7.

K1, K2, K3, K4 relays malfunction.

 

8.

Relay board malfunction.

 

 

 

Excessive time for boiler to reach

1.

Supply voltage incorrect.

operating pressure (over 15 min.).

2.

Heating elements not wired correctly.

 

3.

Contactor(s) malfunction.

 

4.

Water supply off or low pressure, filtering system clogged,

 

 

boiler fill valve clogged or malfunction.

 

5.

Manual blowdown valve on water level probe housing open.

 

6.

Boiler blowdown/drain solenoid valve clogged and not fully

 

 

closing.

 

7.

Steam trap malfunction (stuck open).

 

8.

Pressure relief valve leaking (pressure below 15PSI).

 

9.

Cooking compartment steam solenoid valve clogged and not

 

 

fully closing.

 

10.

Excessive load on boiler due to other equipment connected to

 

 

steam line (outlet from boiler).

 

11.

A heavy build-up of scalants has coated the interior of the

 

 

boiler, creating an insulating effect.

 

 

 

Page 43 of 48

 

F25154 (February 2004)

 

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Page 42 Page 44
Contents VHX24E Shown VHX Boiler Base Series High Efficiency Electric SteamerTable of Contents VHX Series Steamers General INSTALLATION, Operation Cleaning IntroductionModel Number of Pans PAN Depth PER Compartment Inches Boiler 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 Elements Heating Element Mounting PlateRight Side View Shown Boiler AssemblyDescaler Cathodic Protector Handle Cooking Compartment DoorsRemoval GasketLatch Assembly Boiler Service Procedures and AdjustmentsWater Level Controls Test Water Level Probe Housing BlowdownMain Water Level Control Auxiliary Low level Cut-Off Control Cycling Pressure Switch Adjustment Boiler Fill and Cold Water Condenser Solenoid Valves High Limit Pressure Switch AdjustmentCold Water Condenser Thermostat Adjustment Heating Element Test Intake Shut-Off Valve Adjustment Steam FlowCooking Compartment Door Latch Adjustment Door Sealing AdjustmentCold Water Condenser Reset Switch ManualElectrical Operation Component FunctionBlowdown/Drain Compartment Pressure SwitchSteam Solenoid Valve Boiler Base Controls Component LocationsBoiler Base Controls Cooking Compartment Controls Low Level Cut-Off & Differential Control Water Level ControlsAuxiliary Low Level Cut-Off Relay Board Layout, Legend & Diagnostic Test PointsSchematic Initial Fill and Preheat Sequence of OperationBoiler Blowdown/drain Water Refill After Initial FillVHX Series Steamer Electrical Operation Schematics Cooking Compartment Controls Wiring Diagrams VHX Series Steamer Electrical Operation Heating Element Circuits Cooking Compartment Controls Symptom Possible Causes TroubleshootingBoiler Base Controls Symptom Possible Causes Symptom Possible Causes Cooking Compartment Controls VHX Series Steamer VHX Series Steamer VHX24E, VHX24E5, MHB24E Condensed Spare Parts ListPart Number Description
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