Vulcan-Hart MHB24G, VHX24G manual Water Level Probe Housing Blowdown, Descaler Cathodic Protector

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VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

WARNING: READ AND FOLLOW THE INSTRUCTIONS FOR THE DE-LIMING CHEMICAL BEING USED. USE PLASTIC OR RUBBER GLOVES TO AVOID SKIN CONTACT. IF THE CHEMICAL COMES IN CONTACT WITH SKIN, RINSE WITH CLEAN WATER.

5.Mix deliming solution according to the instructions for the chemical being used.

NOTE: Boiler water capacity is approximately seven gallons.

NOTE: If deliming solution comes in contact with steamer components, lightly rinse off with clean water.

A.Turn OFF water supply.

B.Turn power switch ON to close the drain valve.

C.Pour deliming solution into the boiler shell.

6.Install a new gasket on the hand hole plate then position and tighten the plate to the boiler.

7.Ensure cooking compartment timers are OFF.

8.Turn power switch ON and open water supply valve.

9.Allow the boiler to reach operating pressure and run for 90 minutes or per the instructions for the deliming chemical in use.

A.Turn power switch OFF and allow the boiler to completely drain.

B.Turn power switch ON to refill boiler and allow to heat until fully pressurized.

10.Steps 9A and 9B must be repeated three times to thoroughly rinse the boiler.

11.Steamer is now ready for normal operation.

Descaler (Cathodic Protector)

Two descalers are installed inside the boiler shell and are used to as a preventative measure to:

•Reduce scale deposit buildup

•Help remove existing scale deposits

•Inhibit boiler and component corrosion

The type of descaler used has a coiled wire (Cathode) wrapped around a solid cylindrical core (Anode) that hangs by an open loop from the front horizontal support rod inside the boiler.

The descaler materials serve as a sacrificial "Anode" and "Cathode" combination that chemically reacts with the contents of the boiler to meet the three objectives outlined above.

If the coiled wire has eroded away or if the cylindrical core of the descaler has eroded away to approximately half its original diameter, a new descaler should be installed. The size of a new descaler is approximately: 1 3/8" diameter and 3 3/4" long at the core.

NOTE: While the diameter of the descaler decreases through erosion, the length of the descaler will increase. If the descaler has increased to a length that is touching the bottom of the boiler shell, the descaler should be replaced.

The descalers are accessible through the "heat exchanger" opening in the boiler only. For removal of the heat exchanger refer to "HEAT EXCHANGER" under "REMOVAL AND REPLACEMENT OF PARTS".

To install a new descaler, stretch the coiled wire at the top to elongate the wire and form an open loop. Hang the descaler on the front horizontal support rod so that its core will be completely below the minimum water level in the boiler but hanging free. The descaler must not contact the boiler shell or the heat exchanger casting.

WATER LEVEL PROBE

HOUSING BLOWDOWN

The water contained in the probe housing, being under pressure, should be "blown through" this manual valve and be noticeably visible exhausting out the steamer drain. The probe housing blowdown should be performed in a time frame dependant on the quality of the local water supply and steamer usage. In hard water areas or for steamers heavily

F24700 (October 2001)

 

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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
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