Vulcan-Hart VSX24D Service Manual
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Vulcan-Hart VSX24D Service Manual

Vsx boiler base series convection steamers
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VSX24G SHOWN
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified. If you have attended a Vulcan Service School for this
product, you may be qualified to perform all the procedures
described in this manual.
This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its entirety, the repair 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, instruments and skills should be
performed by a trained Vulcan Service Technician.
Reproduction or other use of this Manual, without the express
written consent of Vulcan, is prohibited.
A product of VULCAN-HART
Form 24627 (12/98)
SERVICE MANUAL
VSX BOILER BASE SERIES
CONVECTION STEAMERS
(GAS, ELECTRIC, DIRECT AND REGENERATED)
VSX24G
ML-52163
VSX36G
ML-52360
VSX42GT ML-52376
VSX24E
ML-52164
VSX36E
ML-52829
VSX42ET
ML-52833
- NOTICE -
VSX24D
ML-52827
VSX36D
ML-52830
VSX42DT
ML-52834
VSX36R
ML-52831
VSX42RT
ML-52835
LOUISVILLE, KY 40201-0696

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Summary of Contents for Vulcan-Hart VSX24D

  • Page 1 ML-52833 VSX24G SHOWN - NOTICE - This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. If you have attended a Vulcan Service School for this product, you may be qualified to perform all the procedures described in this manual.

  • Page 2: Table Of Contents

    VSX SERIES STEAMERS TABLE OF CONTENTS GENERAL ................4 Introduction .
  • Page 3 VSX24D, 36D and 42DT ........

  • Page 4: General

    VSX SERIES STEAMERS - GENERAL GENERAL Boiler Code Descriptions INTRODUCTION Vulcan-Hart incorporates redundant controls in compliance with California Code (Cal-Code) and General CSD-1 as an option on steam equipment when required by state and/or local building code This manual is applicable for all models listed on the requirements.

  • Page 5: Specifications

    VSX SERIES STEAMERS - GENERAL SPECIFICATIONS Gas Steamers LINE PRESSURE MANIFOLD INPUT AMPS (INCHES W.C.) PRESSURE (BTU/HR) LOAD (MAX) (INCHES W.C.) NATURAL PROPANE (WATTS) 120V MODEL NAT. PROP. NAT. PROP. RECOMMEND RECOMMEND 60HZ VSX24G 200,000 200,000 10.0 11.0 11.0 200,000 200,000 10.0 11.0...

  • Page 6: Water Supply

    Special prevented by furnishing the boiler with soft water. CLR Treatment Kit - Used to remove Vulcan recommends the water contain less than Calcium/Lime/Rust from a boiler (Contact 60ppm of “total dissolved solids” (TDS) and have a Vulcan Authorized Service Centers ).

  • Page 7: Steamer Operation

    VSX SERIES STEAMERS - OPERATION STEAMER OPERATION WARNING: THE STEAMER AND 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. On Models with Automatic Ignition - CABINET BASE BOILERS The knob on the gas combination control valve has two positions (On-Off) for...

  • Page 8: Electrically Powered Steam Boiler

    VSX SERIES STEAMERS - OPERATION Electrically Powered Steam Boiler BOILER BLOWDOWN AND Open the cabinet door and turn main power switch STEAMER SHUT OFF ON. The red light will illuminate, water will begin filling the boiler and the blowdown solenoid valve Turn the steamer off at least once daily and blow will close.

  • Page 9: Cooking Compartment Controls

    VSX SERIES STEAMERS - OPERATION When timer knobs reach "0", buzzers will COOKING COMPARTMENT sound, steam generation will cease, cooking CONTROLS lights will go off and ready lights will come on. To silence buzzers, turn timer knobs to off position. When the steam pressure in the cooking compartment manifold reaches approximately 3 psi, During a cooking cycle, the heating system will...

  • Page 10: Component Function And Location

    VSX SERIES STEAMERS - COMPONENT FUNCTION AND LOCATION COMPONENT FUNCTION AND LOCATION Cycling Pressure Switch - controls boiler pressure CABINET BASE BOILER between prescribed limits by turning the heat source CONTROLS on and off. High Limit Pressure Switch - a switch of identical design to the cycling pressure switch but used as a WARNING: THE STEAMER AND ITS PARTS ARE high limit.
  • Page 11 VSX SERIES STEAMERS - COMPONENT FUNCTION AND LOCATION Pressure Gauge - indicates boiler steam pressure. Normal operating pressures are listed below. STEAMER TYPE 8 -10 Electric 11 - 13 Direct 10 - 12 Regenerated 10 - 12 Drain - drains steam condensate and water from cooking compartments and boiler.
  • Page 12 VSX SERIES STEAMERS - COMPONENT FUNCTION AND LOCATION Page 12 of 80...
  • Page 13 VSX SERIES STEAMERS - COMPONENT FUNCTION AND LOCATION Page 13 of 80...

  • Page 14: Cooking Compartment Controls

    VSX SERIES STEAMERS - COMPONENT FUNCTION AND LOCATION Steam Solenoid Valve - when energized, opens to COOKING COMPARTMENT allow steam into the cooking compartment (normally CONTROLS closed valve). Compartment Pressure Switch - supplies power to the controls only after the steam pressure rises WARNING: THE STEAMER AND ITS PARTS ARE above 2.3 psi to close the compartment pressure HOT.

  • Page 15: Service Procedures

    VSX SERIES STEAMER - SERVICE PROCEDURES SERVICE PROCEDURES 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.

  • Page 16: Descaler

    VSX SERIES STEAMER - SERVICE PROCEDURES 10. Cooking compartment timers are to be in the OFF position. Turn the boiler switch ON and open water valve if necessary. 11. Boiler is to operate under pressure for 90 minutes or per the instructions for the chemical in use.

  • Page 17: Water Level Gauge Assembly

    VSX SERIES STEAMER - SERVICE PROCEDURES Does the HL LED go out and the HL relay Clean probe thoroughly, removing ALL deposits de-energize, allowing the contact state to from the insulator. Do not use an abrasive on switch back to its starting condition after the insulator;...

  • Page 18: High Limit Thermostat

    VSX SERIES STEAMER - SERVICE PROCEDURES Remove the remaining plumbing and electrical High Limit Thermostat connections from the boiler to the controls. Remove WARNING: DISCONNECT THE ELECTRICAL the bolts securing the boiler to the frame and lift it POWER TO THE MACHINE AT THE MAIN out.

  • Page 19: Water Not Being Supplied To Boiler

    VSX SERIES STEAMER - SERVICE PROCEDURES Remove the stem locking nut to remove the Newer steamer models use a plunger type rod that stem from the valve body. raises and lowers to permit steam/water flow out of boiler. If debris has accumulated around the water All parts are now accessible for inspection and orifice, the plunger may not seat properly to close cleaning.

  • Page 20: Steamer Achieves Pressure Slower Than Normal

    VSX SERIES STEAMER - SERVICE PROCEDURES Gas orifice clogged or obstructed around Steamer Achieves Pressure Slower Than Normal air shutter. It is possible for debris to If the boiler requires more than 15 minutes (20 become lodged in the small gas orifice minutes for regenerated models) to achieve normal opening over time.

  • Page 21: Inlet Water Strainer

    VSX SERIES STEAMER - SERVICE PROCEDURES Inlet Water Strainer NOTE: If adjustments in gas or pilot pressure settings are made, always replace the adjustment The in-line Y strainer should be located upstream of cover screw to assure proper gas control operation. the fill valve solenoid.

  • Page 22: Automatic Ignition Systems

    VSX SERIES STEAMER - SERVICE PROCEDURES Check the thermocouple output voltage (DC High voltage is sent from terminal nine to the spark electrode and an output of 24 volts is sent from millivolts) with a VOM. If a meter is not available, terminals two and three to the pilot coil in the replace the thermocouple with a new one and combination valve, allowing gas to flow to the pilot.

  • Page 23: Gas Combination Control Valve Replacement

    VSX SERIES STEAMER - SERVICE PROCEDURES Check the ignition cable for tightness or Spark Ignition Control Test damaged insulation. If the ignition control module does not appear Check unit for proper operation. to be sparking to ignite gas, perform the following checks.

  • Page 24: Electric Models

    VSX SERIES STEAMER - SERVICE PROCEDURES If other appliances are connected to the Once the correct pressure has been set, turn same gas line, turn them all ON and check the power switch OFF, replace the adjustment manometer pressure reading again. If a screw cap and 1/8 inch NPT plug (pressure tap) pressure drop of ½...
  • Page 25 VSX SERIES STEAMER - SERVICE PROCEDURES Remove the lead wires from the heating element and check the element resistance using a VOM. If resistance readings are not correct, replace heating element. To replace an element, drain water from boiler shell. Remove cover of contactor box, remove electric wires to that element's terminals, remove bolts through flange of element and pull element forward.

  • Page 26: Direct Steam Models

    VSX SERIES STEAMER - SERVICE PROCEDURES Ensure that voltage is reaching control circuit DIRECT STEAM MODELS through compartment pressure switch, when These models consist of a pressure regulator and the main power switch is turned ON. gauge that run off a buildings potable steam supply. On electric heat models with a transformer, The maximum input pressure to the regulator should check step down transformer for proper...

  • Page 27: Water Accumulating In Compartment

    VSX SERIES STEAMER - SERVICE PROCEDURES Monitor gauge reading 1 to 2 cycles to ensure Water Accumulating in Compartment - Water pressure is set correctly. accumulation on the bottom of the cooking compartment(s) is primarily condensed steam. Once the valve is set, turn both cooking timers Failure to drain out quickly and completely, may be off and reinstall right side control panel.
  • Page 28 VSX SERIES STEAMER - SERVICE PROCEDURES Sealing Adjustment NOTE: When installing the spacers, the smaller diameter fits into the slot in the door and the latch Check the door gasket quality. If damaged or lever must rest on top of the handle latch screw. worn, replace as outlined in “REMOVAL”...
  • Page 29 VSX SERIES STEAMER - SERVICE PROCEDURES Open the door and check the strikers’ slot for Latch Adjustment horizontal alignment. The slot on the striker Should the cooker door jam and can not be opened, must be kept horizontal in order for the door DO NOT FORCE OR PRY the door as damage will latch to catch it properly and latch.

  • Page 30: Electrical Operation

    VSX SERIES STEAMER - ELECTRICAL OPERATION ELECTRICAL OPERATION When the water level drops below the low level (LL) WATER LEVEL CONTROLS probe, power is removed from the inverse latching relay, the HL relay energizes through ILR-2 and HL contacts change state. The fill solenoid is energized Solid State - through HL-3 to refill the boiler and the HL LED is lit.
  • Page 31 VSX SERIES STEAMER - ELECTRICAL OPERATION Solid State - Auxiliary Low Level Cut-Off This control serves as a safety backup to the main water level control (WLC) board to meet Cal-Code and CSD-1 code requirements. The operation of the auxiliary control is identical to the low level cut-off (LLCO) function of the main WLC board but performs a single function: 1) Provide auxiliary low level cut-off protection to shut off the heat source in...

  • Page 32: Electro Mechanical - Low Level Cut-Off & Differential Control

    VSX SERIES STEAMER - ELECTRICAL OPERATION Electro Mechanical - Low level Cut-Off & Differential Control The steamer is equipped with three water level sensing probes (high, low and low level cut-off), a differential level control (1G1GO) and a low level cut-off control (1D1DO). The low-level cut-off is an additional control that is identical to the differential level control but serves as the safety backup to shut off the heat source in case the water level drops below the low level cut-off (LLCO) probe.
  • Page 33 VSX SERIES STEAMER - ELECTRICAL OPERATION Electro Mechanical - Auxiliary Low Level Cut-Off This control serves as a safety backup to the main low level cut-off (LLCO) control to meet Cal-Code requirements. The operation of the auxiliary control is identical to the main low level cut-off control but performs a single function: 1) Provide auxiliary low level cut-off protection to shut off the heat source in case the water level drops below the low level cut-off (LLCO) probe.

  • Page 34: Sequence Of Operation

    VSX SERIES STEAMER - ELECTRICAL OPERATION NOTE: The high pressure indicator light will remain SEQUENCE OF OPERATION on and the safety circuit de-energized until boiler steam pressure is within operational limits (high limit pressure switch closed) and the manual reset button GAS MODELS is pressed.
  • Page 35 VSX SERIES STEAMER - ELECTRICAL OPERATION Power to terminal 9 on the water level Auxiliary gas solenoid valve is energized control. and opens to allow gas flow. LLCO relay energizes, LLCO-2 (N.O.) As long as the ignition control module is contacts close and LED lights.
  • Page 36 VSX SERIES STEAMER - ELECTRICAL OPERATION Boiler steam pressure is maintained by the NOTE: Burners will re-light after the boiler pressure cycling of the pressure switch between the drops below the low pressure set point limit (8 psi) upper and lower set point limits. The and will stay on until the high pressure set point (10 cycling pressure switch continues to psi) is reached.

  • Page 37: Electric Models

    VSX SERIES STEAMER - ELECTRICAL OPERATION The inverse latching relay of the water L2 (NEUTRAL) to in-line fuse (10 level control is energized, changing the amp.); to the other side of the primary state of ILR-1 (N.O.) and ILR-2 (N.C.) on the step down transformer (H2);...
  • Page 38 VSX SERIES STEAMER - ELECTRICAL OPERATION Cycling pressure switch opens, heater NOTE: LLCO relays will remain energized and contactors de-energize and power to LLCO LED’S will remain lit until the water level heating elements is removed. drops below the LLCO probes or the power switch is turned off.
  • Page 39 VSX SERIES STEAMER - ELECTRICAL OPERATION Ready light (green) is lit. The inverse latching relay is de- energized, returning ILR-1 (N.O.) and Product is inserted into steamer. ILR-2 (N.C.) contacts back to their Door is closed. original state. Timer is dialed on timer. HL relay is energized.
  • Page 40 VSX SERIES STEAMER - ELECTRICAL OPERATION PAGE PURPOSELY LEFT BLANK Page 40 of 80...

  • Page 41: Schematics, Gas Steamers, Boiler Controls Vsx24G, 36G And 42Gt

    VSX SERIES STEAMER - ELECTRICAL OPERATION SCHEMATICS, GAS STEAMERS, BOILER CONTROLS VSX24G, 36G AND 42GT Manual Ignition, Standard Controls Page 41 of 80...

  • Page 42: Electronic Ignition, Standard Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Electronic Ignition, Standard Controls Page 42 of 80...

  • Page 43: Manual Ignition, Csd-1 Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Manual Ignition, CSD-1 Code Controls Page 43 of 80...

  • Page 44: Electronic Ignition, Csd-1 Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Electronic Ignition, CSD-1 Code Controls Page 44 of 80...
  • Page 45 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 45 of 80...

  • Page 46: Wiring Diagrams, Gas Steamers, Boiler Controls Vsx24G, 36G And 42Gt

    VSX SERIES STEAMER - ELECTRICAL OPERATION WIRING DIAGRAMS, GAS STEAMERS, BOILER CONTROLS VSX24G, 36G AND 42GT Manual Ignition, Standard Controls Page 46 of 80...
  • Page 47 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 47 of 80...

  • Page 48: Electronic Ignition, Standard Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Electronic Ignition, Standard Controls Page 48 of 80...
  • Page 49 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 49 of 80...

  • Page 50: Manual Ignition, Csd-1 Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Manual Ignition, CSD-1 Code Controls Page 50 of 80...
  • Page 51 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 51 of 80...

  • Page 52: Electronic Ignition, Csd-1 Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Electronic Ignition, CSD-1 Code Controls Page 52 of 80...
  • Page 53 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 53 of 80...

  • Page 54: Schematics, Electric Steamers, Boiler Controls Vsx24E, 36E And 42Et

    VSX SERIES STEAMER - ELECTRICAL OPERATION SCHEMATICS, ELECTRIC STEAMERS, BOILER CONTROLS VSX24E, 36E AND 42ET Auto Blowdown, Standard Controls Page 54 of 80...

  • Page 55: Auto Blowdown, Cal-Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Cal-Code Controls Page 55 of 80...

  • Page 56: Auto Blowdown, Standard Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Standard Controls Page 56 of 80...

  • Page 57: Auto Blowdown, Cal-Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Cal-Code Controls Page 57 of 80...

  • Page 58: Wiring Diagrams, Electric Steamers, Boiler Controls Vsx24E, 36E And 42Et

    VSX SERIES STEAMER - ELECTRICAL OPERATION WIRING DIAGRAMS, ELECTRIC STEAMERS, BOILER CONTROLS VSX24E, 36E AND 42ET Auto Blowdown, Standard Controls Page 58 of 80...
  • Page 59 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 59 of 80...

  • Page 60: Auto Blowdown, Cal-Code Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Cal-Code Controls Page 60 of 80...
  • Page 61 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 61 of 80...

  • Page 62: Auto Blowdown, Standard Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Standard Controls Page 62 of 80...
  • Page 63 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 63 of 80...

  • Page 64: Auto Blowdown, Step Down Transformer, Standard Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Step Down Transformer, Standard Controls Page 64 of 80...
  • Page 65 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 65 of 80...

  • Page 66: Auto Blowdown, Step Down Transformer, Cal-Code Controls (2 Contactors)

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Step Down Transformer, Cal-Code Controls (2 contactors) Page 66 of 80...
  • Page 67 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 67 of 80...

  • Page 68: Auto Blowdown, Step Down Transformer, Cal-Code Controls (4 Contactors)

    VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown, Step Down Transformer, Cal-Code Controls (4 contactors) Page 68 of 80...
  • Page 69 VSX SERIES STEAMER - ELECTRICAL OPERATION Page 69 of 80...

  • Page 70: Wiring Diagrams, Electric Heater Circuits Vsx24E, 36E And 42Et

    VSX SERIES STEAMER - ELECTRICAL OPERATION WIRING DIAGRAMS, ELECTRIC HEATER CIRCUITS VSX24E, 36E AND 42ET Standard and Cal-Code/CSD-1 Controls (Newer Models) Page 70 of 80...
  • Page 71 VSX SERIES STEAMER - ELECTRICAL OPERATION Standard and Cal-Code Controls (Older Models) Page 71 of 80...
  • Page 72 VSX SERIES STEAMER - ELECTRICAL OPERATION 3 Phase, 4 Wire (Older Models) Page 72 of 80...

  • Page 73: Schematic, Direct Steamers, Cabinet Base Vsx24D, 36D And 42Dt

    VSX SERIES STEAMER - ELECTRICAL OPERATION SCHEMATIC, DIRECT STEAMERS, CABINET BASE VSX24D, 36D AND 42DT See “SCHEMATIC ALL MODELS - COMPARTMENT CONTROLS” WIRING DIAGRAM, DIRECT STEAMERS, CABINET BASE VSX24D, 36D AND 42DT See “WIRING DIAGRAM ALL MODELS - COMPARTMENT CONTROLS”...

  • Page 74: Wiring Diagrams, Regenerated Steamers, Boiler Controls Vsx36R And 42Rt (Older Models)

    VSX SERIES STEAMER - ELECTRICAL OPERATION WIRING DIAGRAMS, REGENERATED STEAMERS, BOILER CONTROLS VSX36R AND 42RT (OLDER MODELS) Manual Blowdown Page 74 of 80...
  • Page 75 VSX SERIES STEAMER - ELECTRICAL OPERATION Auto Blowdown Page 75 of 80...

  • Page 76: Schematic All Models - Compartment Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION SCHEMATIC ALL MODELS - COMPARTMENT CONTROLS Page 76 of 80...

  • Page 77: Wiring Diagram, All Models - Compartment Controls

    VSX SERIES STEAMER - ELECTRICAL OPERATION WIRING DIAGRAM, ALL MODELS - COMPARTMENT CONTROLS Page 77 of 80...

  • Page 78: Troubleshooting

    VSX SERIES STEAMER - TROUBLESHOOTING TROUBLESHOOTING ALL MODELS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TESTS 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.
  • Page 79 VSX SERIES STEAMER - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES Steam output low or slow cooking. Blocked steam injector ports. (Open door, press door switch button and verify good steam flow into compartment) Steam solenoid valve not fully opening or blocked. Steam intake shut-off valve closed or out of adjustment. See “INTAKE SHUT-OFF VALVE ADJUSTMENT (STEAM FLOW)”...
  • Page 80 VSX SERIES STEAMER - TROUBLESHOOTING GAS MODELS ONLY SYMPTOM POSSIBLE CAUSES Burner won’t light. Gas not on. Ignition control module reset switch in the OFF position or malfunctioning. Ignition module not receiving power. Check ignition module transformer for 24VAC output to module on automatic ignition systems.

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