Vulcan-Hart MHB24G, VHX24G5 manual K32 Close, K51 Close, Air Pressure Switch Satisfied State D

Page 45

VHX SERIES STEAMER - ELECTRICAL OPERATION

LED

STATUS

DESCRIPTION

ELECTRICAL COMPONENTS CONDITION

 

 

ON

OFF

 

 

 

 

 

 

 

 

N1

X

 

same as “state A”

 

 

 

 

 

 

N2

X

 

same as "state B"

 

 

 

 

 

 

N3

X

 

same as “state A”

 

 

 

 

 

 

N4

X

 

same as "state B

 

 

 

 

 

 

N5

X

 

Reset switch is/was momentarily

K3 energized - K3(1) CLOSE (locking circuit)

 

energized

 

 

 

 

 

 

 

 

 

N6

 

X

Aux Water level is satisfied.

K3 energized - K3(1) OPEN

 

(Amber WATER light OFF)

 

 

 

 

 

 

 

 

 

N7

X

 

Reset switch is/was momentarily

K4 energized - K4(1) CLOSE (locking circuit)

 

energized

 

 

 

 

 

 

 

 

 

N8

 

X

High Limit is satisfied.

K4 energized - K4(1) OPEN

 

(Amber HIGH PRESS OFF)

 

 

 

 

 

 

 

 

 

N9

X

 

same as “state A”

 

 

 

 

 

 

N10

X

 

High limit is satisfied and reset

K3(2) CLOSE

 

switch energized

 

 

 

 

 

 

 

 

 

N11

X

 

Aux Water level is satisfied and

K4(2) CLOSE, K5 energized

 

reset switch energized

 

 

 

 

 

 

 

 

 

N12

X

 

Air intake blower receiving power

K5(1) CLOSE

 

 

 

 

 

N13-N17 remain OFF

 

 

 

 

 

 

 

Air Pressure Switch Satisfied: (STATE D)

Assume water level control “LLCO” is satisfied (LLCO contacts closed)

N1 thru N12 same as “Reset Engaged: (state C)"

LED

STATUS

DESCRIPTION

ELECTRICAL COMPONENTS CONDITION

 

 

ON

OFF

 

 

 

 

 

 

 

 

N13

X

 

Air pressure switch satisfied

24V to ignition module (term 6)

 

 

 

 

 

N14

X

 

Ignition module PV coil energized

PV CLOSE, 24V to K7

 

 

 

 

 

 

 

 

Pilot gas valve is energized.

K7 energized K7(1) CLOSE, relay board timer

N15

X

 

Note: N15 and the pilot gas valve will

circuit energized and starts time count. K6

 

be ON for approximately 15 seconds,

energized K6(1) CLOSE, pilot gas valve coil

 

 

 

 

 

 

then turn OFF.

energized for 15 sec. only.

 

 

 

 

 

N16

X

 

Ignition module PV coil energized,

MV CLOSE, 24V to water level board LLCO

 

pilot ignition flame is detected

contacts

 

 

 

 

 

 

 

 

 

 

 

Water level board LLCO is satisfied

Main gas valve coil energized, main burner

N17

X

 

and main gas valve is receiving

 

lights and flame continues to be detected.

 

 

 

power.

 

 

 

 

 

 

 

 

 

Burner ON, Boiler Heating to generate steam: (STATE E)

All LED’s ON except N6 & N8, N15 (still OFF from state D)

Burner OFF, Boiler Pressure Satisfied: (STATE F)

These LED’s should be OFF - N6, N8, N9, , N10, N11, N12, N13, N14, N15 (still OFF from state D) N16 & N17 These LED’s should be ON - N1 thru N5, N7

Page 45 of 68

 

F24700 (October 2001)

 

Page 44 Page 46
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Contents VHX24G Shown VHX Boiler Base Series High Efficiency GAS SteamersTable of Contents VHX Series Steamers Installation Maintenance Cleaning IntroductionGeneral Boiler Control Styles System Water Conditioning SpecificationsWater Supply ElectricalGas Supply ToolsStandard SpecialCabinet Base Boiler Steamer OperationCooking Compartment Controls VHX Series Steamers OperationBoiler Blowdown Steamer Shut OFF VHX Series Steamers Component Function Component FunctionBlowdown/Drain Ignition Control ModuleWater Level Steam Header AssemblyWater Inlet Valve manual Pressure Relief ValveSteam Solenoid Valve Compartment Pressure SwitchManifold Pressure Gauge Steam Supply ManifoldVHX Series Steamers Removal and Replacement of Parts 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 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 Cooking Compartment Doors RemovalGasket Handle Latch AssemblyClean-Out Service Procedures and AdjustmentsBoiler InspectionDescaler 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 Door Sealing Adjustment Intake Shut-Off Valve Adjustment Steam FlowCooking Compartment Cooking Compartment DoorsVHX Series Steamer Electrical Operation Door Latch AdjustmentLow Level Cut-Off & Differential Control Electrical OperationAuxiliary Low Level Cut-Off LED Legend Board Layout and LED LegendReset Engaged State C Boiler Operational Status LED IndicatorInitial Conditions State a Aux Water Level Satisfied State BK32 Close Air Pressure Switch Satisfied State DK51 Close Burner ON, Boiler Heating to generate steam State ENEW Style Controls Boiler Sequence of OperationInitial Fill and Preheat HL-LEDN14, 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 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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