Vulcan-Hart VHX24E service manual Auxiliary Low level Cut-Off Control

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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

1)Verify wire color connections are correct at probe numbers 50, 51 & 52, and at the water level control board.

2)Turn power switch off.

3)Remove probe assembly, clean lime scale build-up from the probes and compare probe lengths to drawing.

4)Disconnect 3/8” flexible line (air equalization tube) from probe housing assembly and from boiler tee. Check flex line for obstructions and remove as necessary.

5)Disconnect 3/8” flexible line (pressure switch tube) from boiler tee. Remove boiler tee and check for obstructions in the tee and in the mounting hole. Remove obstructions as necessary.

NOTE: When replacing, boiler tee must be mounted vertical to prevent a blockage due to condensate build-up.

4.Test LLCO circuit on water level control board.

A.Turn power switch on and allow boiler to fill. Do not press the reset switch to start heating.

B.Turn water supply off and open the ball valve on probe housing assembly. This will allow boiler water to drain.

C.When water level is no longer visible in sight glass and is below LLCO probe; LLCO LED should turn off, LLCO relay should de-energize and return LLCO relay contacts to there shelf state.

D.Repeat at least twice to verify correct LLCO operation.

Auxiliary Low level Cut-Off Control

5.Turn power switch off.

6.Disconnect lead wire from Aux LLCO probe.

A.Set VOM to read resistance (ohms) and connect meter leads to Aux LLCO probe and boiler. If there is any measurable resistance, remove and clean the Aux LLCO probe.

B.Replace the probe and check resistance again. If resistance is still present, install a replacement probe.

C.Verify resistance measurement with new probe installed.

7.Turn power switch on and allow boiler to begin filling. Do not press the reset switch to start heating.

8.With water below the lowest visible level in sight glass (below Aux LLCO probe) and boiler in initial fill state:

A.Verify Aux LLCO LED is not lit on the Aux water level control board.

F25154 (February 2004)

 

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Contents VHX Boiler Base Series High Efficiency Electric Steamer VHX24E ShownTable of Contents VHX Series Steamers INSTALLATION, Operation Cleaning Introduction GeneralModel Number of Pans PAN Depth PER Compartment Inches Boiler Code Descriptions SpecificationsWater Conditioning Boiler PressureStandard ToolsElectrical 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 Gasket Cooking Compartment DoorsRemoval HandleLatch Assembly Service Procedures and Adjustments BoilerWater Level Probe Housing Blowdown Water Level Controls TestMain Water Level Control 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 Intake Shut-Off Valve Adjustment Steam Flow Heating Element TestCooking Compartment Door Sealing Adjustment Door Latch AdjustmentComponent Function Reset Switch ManualElectrical Operation Cold Water CondenserCompartment Pressure Switch Blowdown/DrainSteam Solenoid Valve 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 Troubleshooting Symptom Possible CausesBoiler Base Controls Symptom Possible Causes Symptom Possible Causes Cooking Compartment Controls VHX Series Steamer VHX Series Steamer Condensed Spare Parts List VHX24E, VHX24E5, MHB24EPart Number Description
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