Vulcan-Hart VHX24G5 Service Procedures and Adjustments, Boiler, Inspection, Clean-Out, Deliming

Page 23

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRES ELECTRICAL TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

BOILER

Inspection

It is recommended the boiler be inspected for excessive lime scale build up in a time frame dependant on the quality of the local water supply and steamer usage. In hard water areas or for steamers heavily used, a frequent interval should be used. This inspection consists of an internal examination and cleaning of the boiler, an examination of the two hanging descalers, and for lime build up on the water level probes. Also, a check of all boiler controls, including the pressure switches.

Periodic service must be performed as outlined in these procedures. See “WATER CONDITIONING” under “GENERAL”.

Clean-Out

1.Turn power switch OFF.

A.Boiler should automatically start blowdown/drain cycle.

2.Remove the burner assembly and heat exchanger as outlined under "HEAT EXCHANGER" in "REMOVAL AND REPLACEMENT OF PARTS".

NOTE: Access to the interior of the boiler through the hand hole cover is very limited on this model and is recommended to be removed for deliming purposes only.

3.Remove old descalers (cathodic protectors).

4.With a wire brush or equivalent:

A.Dislodge and remove all loose scale from boiler shell. The loose material must be scooped from the boiler or flushed through the washout drain.

B.Remove all loose scale form the heat exchanger.

C.Clean the mating surfaces of the heat exchanger and boiler.

5.Check probe housing and water level probes for scale build up and clean as necessary. Refer to "WATER LEVEL CONTROLS TEST".

6.Check the drain line exiting the boiler for obstructions.

A.Remove the strainer clean out plug, turn the steamer on and allow the boiler "fill water" to flush-out the drain line. Turn the steamer off, remove the cap and strainer screen and clean, if necessary, before replacing the screen and clean-out plug.

7.Inspect condition of the descalers as outlined under "DESCALER (Cathodic Protector)" in this section, and replace if necessary.

8.Install a new gasket and replace the burner assembly and heat exchanger by reversing the removal procedure from step 2.

9.Delime the boiler as outlined under "DELIMING" in this section.

Deliming

Boiler deliming 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 used, a frequent interval should be used. See “WATER CONDITIONING” under “GENERAL”.

On steamers using a water treatment system, follow the instructions for that system to delime the boiler. Only use the type of chemical recommended or described in the instructions for deliming with this type of system.

If a water treatment system is not used, follow the instructions for deliming the boiler as outlined in the steps below.

1.Turn power switch OFF.

A.Boiler should automatically start blowdown/drain cycle.

2.Remove hand hole plate and gasket (top front) from the boiler by removing the nut and clamp, then tap the cover lightly to free it. Hold the stud in the plate while tapping to prevent the plate from dropping into boiler.

3.Clean the mating surfaces of the hand hole opening and plate.

4.Delime the boiler:

A.If the boiler was delimed through a water treatment system, proceed to step 7.

B.If the boiler has not been delimed, proceed to step 5.

Page 23 of 68

 

F24700 (October 2001)

 

Page 22 Page 24
Image 23
Page 22 Page 24
Contents VHX24G Shown VHX Boiler Base Series High Efficiency GAS SteamersTable of Contents VHX Series Steamers General InstallationMaintenance Cleaning Introduction Boiler Control Styles Electrical Water Conditioning SpecificationsSystem Water SupplySpecial ToolsGas Supply StandardVHX Series Steamers Operation Steamer OperationCabinet Base Boiler Cooking Compartment ControlsBoiler Blowdown Steamer Shut OFF Ignition Control Module Component FunctionVHX Series Steamers Component Function Blowdown/DrainPressure Relief Valve Steam Header AssemblyWater Level Water Inlet Valve manualSteam Supply Manifold Compartment Pressure SwitchSteam Solenoid Valve Manifold Pressure GaugeCabinet Base Boiler Controls Removal and Replacement of PartsVHX Series Steamers Removal and Replacement of Parts Component LocationsCabinet Base Boiler Controls Cooking Compartment Controls Water Level Controls Main or Auxiliary LlcoRelay Board Boiler Assembly Water Level Gauge AssemblyPressure Switches Boiler Fill and Cold Water Condenser Solenoid Valves Pilot GAS Valve Main GAS ValveComplete Burner Assembly Burner Head AssemblyHeat Exchanger VHX Series Steamers Removal and Replacement of Parts Gasket Cooking Compartment DoorsRemoval Handle Latch AssemblyInspection Service Procedures and AdjustmentsClean-Out BoilerDescaler Cathodic Protector Water Level Probe Housing BlowdownTest Water Level ControlsAuxiliary Low level Cut-Off Control Cycling High LimitSmall increments Fill and Cold Water Solenoid ValvesBoiler BLOWDOWN/DRAIN Solenoid Valve Inline Water Strainer CleaningMain Burner Ignition Checks Pressure Switch AdjustmentGAS 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 Terminals Ignition Control Module ChecksSpark Verification Test Cooking Compartment Doors Intake Shut-Off Valve Adjustment Steam FlowDoor Sealing Adjustment Cooking CompartmentVHX Series Steamer Electrical Operation Door Latch AdjustmentLow Level Cut-Off & Differential Control Electrical OperationAuxiliary Low Level Cut-Off LED Legend Board Layout and LED LegendAux Water Level Satisfied State B Boiler Operational Status LED IndicatorReset Engaged State C Initial Conditions State aBurner ON, Boiler Heating to generate steam State E Air Pressure Switch Satisfied State DK32 Close K51 CloseHL-LED Sequence of OperationNEW Style Controls Boiler Initial Fill and PreheatN14, N16, N17 go out N9, N10, N11, N12, N13 go outBoiler Blowdown/drain Water Refill After Initial FillVHX Series Steamer Electrical Operation Cooking Compartment Controls This page Intentionally Left Blank Models Built After 5/25/00 New Style Boiler Controls SchematicsVHX 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