Vulcan-Hart ML-52163 Service Manual Download Page 82

Page: 82 / 82

SYMPTOM

POSSIBLE CAUSES

Ceramic flame rod insulator on ignitor cracked or
damaged from extreme heat.

Ignition module not receiving power.

Ignition module malfunction.

VSX BOILER BASE SERIES CONVECTION STEAMERS - TROUBLESHOOTING

F24627 (0916)

Page 82 of 82

Summary of Contents for ML-52163

Page 1: ...procedure you wish to perform to determine if you have the necessary tools instruments and skills required to perform the procedure Procedures for which you do not have the necessary tools instrument...

Page 2: ...RE ADJUSTMENT 24 HEAT ELECTRIC MODELS 24 HEAT DIRECT STEAM MODELS 26 HEAT REGENERATED STEAM MODELS STEAM COIL 26 COOKING COMPARTMENT 27 CONTROLS 27 STEAM SUPPLY SOLENOID 27 WATER ACCUMULATING IN COMPA...

Page 3: ...TS VSX24E 36E AND 42ET 71 SCHEMATIC DIRECT STEAMERS CABINET BASE VSX24D 36D AND 42DT 73 WIRING DIAGRAM DIRECT STEAMERS CABINET BASE VSX24D 36D AND 42DT 74 WIRING DIAGRAMS REGENERATED STEAMERS BOILER C...

Page 4: ...codes are listed below Cal Code Construction Redundant controls in the electrical safety circuits that if tripped must manually be reset after the condition causing the trip subsides These controls co...

Page 5: ...re rapid heat up of heavy cold loads the steam supply line must be sized to maintain pressure as outlined below DIRECT STEAM STEAMERS POTABLE REGENERATED STEAM STEAMERS NON POTABLE Supply Pressure 15...

Page 6: ...temperature of these surfaces the precipitated minerals bake onto them and become very difficult to remove This causes several problems 1 Reduce the heat transfer efficiency of the heating system 2 C...

Page 7: ...wait 5 minutes before relighting C Turn knob on gas combination control valve to ON If the water level in the boiler has reached the minimum level burners will ignite and begin to heat the water in t...

Page 8: ...er 1 Open the cabinet door and turn main power switch ON The pilot light will illuminate NOTE On older models equipped with a manual ball type blowdown valve the valve must be closed for the boiler to...

Page 9: ...ately 3 psi the pressure switch will open removing power from the cooking compartment controls 1 With both timer knobs at the off position open the compartment doors and observe that no steam has ente...

Page 10: ...d its parts are hot Use care when operating cleaning or servicing the steamer The cooking compartment contains live steam Stay clear when opening each door Cabinet Base Boiler Controls For detailed in...

Page 11: ...ness in the water indicates inadequate water quality and will cause failure of controls and the steamer Warranty does not cover malfunction due to poor water conditions Blowdown and or clean out the b...

Page 12: ...ners A strainer is used in the water inlet line to prevent foreign matter from becoming lodged in the fill or cold water condenser solenoid valves and to keep unwanted particles out of the system A Y...

Page 13: ...dicates steamer is in a cooking cycle Cooking Timer Used to set desired cooking cycle time between 0 60 minutes When a timer is set the steam supply solenoid valve is energized to allow steam into the...

Page 14: ...and remove all loose scale from boiler shell The loose material must be either scooped from the boiler or flushed through the drain 5 Check probe canister and float valve assembly regenerated models...

Page 15: ...into the port Close the deliming assembly valve and proceed to Step 3 3 Top compartments are to be in the OFF position Turn the boiler switch ON and open water valve if necessary 4 Allow boiler to op...

Page 16: ...actor should be replaced CAUTION Be careful to note the location of each probe and the number of the wire connected to it Incorrectly connected wires will cause the controls to malfunction 3 Remove th...

Page 17: ...ers with four heating elements the thermostat is located between the center pair of elements at the top of the elements Inspect the high limit thermostat and mounting surfaces as follows 1 Remove ther...

Page 18: ...ect power leads off the solenoid valve being serviced NOTE It is recommended that the valve be removed from the unit for cleaning to prevent damage to the lines and fittings when the stem is removed f...

Page 19: ...ove any debris found on the sealing surfaces 5 Reassemble and reinstall the valve 6 If valve still malfunctions replace it and recheck for proper operation BLOWDOWN SOLENOID VALVE DOES NOT DRAIN The p...

Page 20: ...ller Clean as needed If clogging reappears the orifice should be removed cleaned and reinstalled Remove any other foreign objects that appear to be obstructing the gas orifice or air shutters Electric...

Page 21: ...he thermocouple tip The flame should be about one inch long with half its length extending beyond the outer edges of the pilot shield If the pilot flame does not appear to be this length and color the...

Page 22: ...finger tight 7 Check for proper operation Shut off the gas before servicing the unit All gas joints disturbed during servicing must be checked for leaks Check with a soap and water solution bubbles Do...

Page 23: ...Burner 5 Ground 24VAC Neutral 6 24VAC Input 7 High Voltage This signal is supplied to spark electrode The pilot flame current is sensed by the module via the spark electrode high voltage wire and ter...

Page 24: ...sure reading again If a pressure drop of inch water column or more is observed then the gas supply needs to be checked by the gas line installer or the local gas company for adequate sizing 7 If no ot...

Page 25: ...terminals and verify it against the data plate voltage A If voltage is correct then proceed to Step 2 B If voltage is not correct check the following Fuses or breaker blown Power to contactor coils C...

Page 26: ...tall A Look at the flange and tube mounting surfaces B If required clean the flange and tube mounting surfaces C Install a new gasket on the heating element D Inset the heating element in the unit and...

Page 27: ...not easily accessible disconnect power and follow lockout tagout procedures attach test equipment and reapply power to the test CONTROLS For access to compartment controls remove the right side compar...

Page 28: ...NNOT BE ACTIVATED When the power switch on boiler control box is ON set the timer knob to 2 minutes Both READY lights should go off COOKING lights should come on and steam should be entering both comp...

Page 29: ...n screws until screw head touches gasket plate and at that point begin counting turns D Tighten all screws approximately two turns E Close the door and check unit for proper operation F If necessary t...

Page 30: ...ove the side edge screws Fig 21 that secure the latch mechanism in the door E Remove the latch from the door Fig 21 2 Install A Place the latch in the door and align the mounting holes B Use screws to...

Page 31: ...s base using a rag and vise grips F Tighten the striker nut hand tight plus a quarter turn Be careful not to damage the striker slot when tightening or door may not latch properly Fig 22 VSX BOILER BA...

Page 32: ...LED With the HL 3 contacts close the boiler fill solenoid is energized and water begins filling the boiler Fig 24 When the water level reaches the LLCO probe the LLCO relay energizes and turns on the...

Page 33: ...et switch contacts to energize the heat source auxiliary control ELECTRO MECHANICAL LOW LEVEL CUT OFF AND DIFFERENTIAL CONTROL The steamer is equipped with three water level sensing probes High Level...

Page 34: ...n to shut off the heat source in case the water level drops below the LLCO probe A single LLCO probe identical to the LLCO probe on the main low level cut off control is connected to the auxiliary con...

Page 35: ...valve ON Gas supply valve ON Gas combination control valve ON Control cycling pressure switch CLOSED High limit pressure switch CLOSED CWC thermostat OPEN Blowdown solenoid valve drain OPEN Boiler em...

Page 36: ...nergized and LLCO LED S will remain ON until the water level drops below the LLCO probes or the power switch is turned OFF 4 Water reaches LL probe Power to terminal 2 on the water level control is pr...

Page 37: ...e gas flow to the burners and the high limit failure light will come on This light will stay lit until the pressure drops below the lower limit set point of 6 PSI and the manual re set switch is press...

Page 38: ...ts except CWC thermostat and CWC solenoid valve The CWC thermostat cycles as necessary to lower the discharge temperature of the water and condense steam going into the drain ELECTRIC MODELS This sequ...

Page 39: ...pressure reaches 3 PSI approximately 14 minutes Green READY light turns ON NOTE If a cooking timer is set immediately after the green READY light comes on a loud clanking sound will be heard oil canin...

Page 40: ...e cooking heating elements can go off The boiler is able to re pressurize to the upper set point even with both compartments in cook mode NOTE The CWC thermostat remains closed and CWC solenoid stays...

Page 41: ...iler blowdown sequence starts The blowdown solenoid valve N O is de energized and valve opens to drain the boiler Power is removed from all components except CWC thermostat and solenoid valve The CWC...

Page 42: ...Schematics Gas Steamers Boiler Controls VSX24G 36G and 42GT MANUAL IGNITION STANDARD CONTROLS VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 42 of 82...

Page 43: ...ELECTRONIC IGNITION STANDARD CONTROLS VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 43 of 82 F24627 0916...

Page 44: ...MANUAL IGNITION CSD 1 CODE CONTROLS VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 44 of 82...

Page 45: ...ELECTRONIC IGNITION CSD 1 CODE CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 45 of 82 F24627 0916...

Page 46: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 46 of 82...

Page 47: ...Wiring Diagrams Gas Steamers Boiler Controls VSX24G 36G and 42GT MANUAL IGNITION STANDARD CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 47 of 82 F24627 0916...

Page 48: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 48 of 82...

Page 49: ...ELECTRONIC IGNITION STANDARD CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 49 of 82 F24627 0916...

Page 50: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 50 of 82...

Page 51: ...MANUAL IGNITION CSD 1 CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 51 of 82 F24627 0916...

Page 52: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 52 of 82...

Page 53: ...ELECTRONIC IGNITION CSD 1 CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 53 of 82 F24627 0916...

Page 54: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 54 of 82...

Page 55: ...Schematics Electric Steamers Boiler Controls VSX24E 36E and 42ET AUTO BLOWNDOWN STANDARD CONTROLS Fig 42 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 55 of 82 F24627 0916...

Page 56: ...AUTO BLOWNDOWN CAL CODE CONTROLS Fig 43 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 56 of 82...

Page 57: ...AUTO BLOWNDOWN STANDARD CONTROLS Fig 44 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 57 of 82 F24627 0916...

Page 58: ...AUTO BLOWNDOWN CAL CODE CONTROLS Fig 45 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 58 of 82...

Page 59: ...Wiring Diagrams Electric Steamers Boiler Controls VSX24E 36E and 42ET AUTO BLOWDOWN STANDARD CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 59 of 82 F24627 0916...

Page 60: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 60 of 82...

Page 61: ...AUTO BLOWDOWN CAL CODE CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 61 of 82 F24627 0916...

Page 62: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 62 of 82...

Page 63: ...AUTO BLOWDOWN STANDARD CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 63 of 82 F24627 0916...

Page 64: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 64 of 82...

Page 65: ...AUTO BLOWDOWN STEP DOWN TRANSFORMER STANDARD CONTROLS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 65 of 82 F24627 0916...

Page 66: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 66 of 82...

Page 67: ...AUTO BLOWDOWN STEP DOWN TRANSFORMER CAL CODE CONTROLS 2 CONTACTORS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 67 of 82 F24627 0916...

Page 68: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 68 of 82...

Page 69: ...AUTO BLOWDOWN STEP DOWN TRANSFORMER CAL CODE CONTROLS 4 CONTACTORS Sheet 1 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 69 of 82 F24627 0916...

Page 70: ...Sheet 2 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 70 of 82...

Page 71: ...ng Diagrams Electric Heater Circuits VSX24E 36E and 42ET STANDARD AND CAL CODE CSD 1 CONTROLS NEWER MODELS Fig 58 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 71 of 82 F24627 0...

Page 72: ...STANDARD AND CAL CODE CONTROLS OLDER MODELS Fig 59 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 72 of 82...

Page 73: ...3 PHASE 4 WIRE OLDER MODELS Fig 60 Schematic Direct Steamers Cabinet Base VSX24D 36D and 42DT VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 73 of 82 F24627 0916...

Page 74: ...s Compartment Controls Wiring Diagram Direct Steamers Cabinet Base VSX24D 36D and 42DT See Wiring Diagram All Models Compartment Controls VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATIO...

Page 75: ...Wiring Diagrams Regenerated Steamers Boiler Controls VSX36R and 42RT Older Models MANUAL BLOWDOWN Fig 61 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 75 of 82 F24627 0916...

Page 76: ...AUTO BLOWDOWN Fig 62 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 76 of 82...

Page 77: ...Schematic All Models Compartment Controls Fig 63 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION Page 77 of 82 F24627 0916...

Page 78: ...Wiring Diagram All Models Compartment Controls Fig 64 VSX BOILER BASE SERIES CONVECTION STEAMERS ELECTRICAL OPERATION F24627 0916 Page 78 of 82...

Page 79: ...to an open drain Steam generated inside compartment when timer is off Steam supply solenoid not fully closing clogged or dirty Replace the steam valve see FILL AND COLD WATER SOLENOID VALVES Timer co...

Page 80: ...ply line Pressure relief valve leaking Steam supply lines leaking badly Steam trap malfunction Unit leaks water Loose water steam or drain line connections top or base Boiler hand hole gasket not seal...

Page 81: ...y lit Gas pressure low See Manifold Pressure Adjustment Ignition module malfunction Check gas orifice for obstruction Pilot not lit or goes out Gas not on Low incoming gas pressure Check thermopile mi...

Page 82: ...Ceramic flame rod insulator on ignitor cracked or damaged from extreme heat Ignition module not receiving power Ignition module malfunction VSX BOILER BASE SERIES CONVECTION STEAMERS TROUBLESHOOTING F...

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