Vulcan-Hart C24GA6 ML-136021 Service Manual
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Vulcan-Hart C24GA6 ML-136021 Service Manual

C24ga series convection steamers
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See also: Operation & Installation Manual
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.
For additional information on Vulcan-Hart or to locate an authorized parts and
service provider in your area, visit our website at www.vulcanhart.com
VULCAN-HART
DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC
WWW.VULCANHART.COM
SERVICE MANUAL
C24GA SERIES
CONVECTION
STEAMERS
C24GA6
C24GA10
- NOTICE -
MODELS
ML-136021
ML-136022
3600 NORTH POINT BLVD.
BALTIMORE, MD 21222
F35425 (February 2006)

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Summary of Contents for Vulcan-Hart C24GA6 ML-136021

  • Page 1 Vulcan Service Technician. Reproduction or other use of this Manual, without the express written consent of Vulcan, is prohibited. For additional information on Vulcan-Hart or to locate an authorized parts and service provider in your area, visit our website at www.vulcanhart.com VULCAN-HART 3600 NORTH POINT BLVD.

  • Page 2: Table Of Contents

    C24GA SERIES CONVECTION STEAMERS TABLE OF CONTENTS GENERAL ................................4 Introduction ............................... 4 Installation ................................ 4 Operation ................................4 Cleaning ................................4 Specifications ..............................4 Gas Line Pressures ..........................4 Burner Pressure ............................4 Electrical ..............................4 Water Supply ............................4 Tools .................................
  • Page 3 Cooking Cycle Cannot be Activated ......................33 Steamer Achieves Pressure Slower Than Normal ..................33 Troubleshooting Sequence Of Operation ......................34 TROUBLESHOOTING CHART ..........................35 CONDENSED SPARE PARTS LIST ........................38 ©VULCAN 2005 Page 3 of 40 F35425 (February 2006)

  • Page 4: General

    C24GA SERIES CONVECTION STEAMERS - GENERAL GENERAL INTRODUCTION TOOLS Procedures in this manual will apply to all models Standard unless specified. Pictures and illustrations can be of • Standard set of hand tools. any model unless the picture or illustration needs to be model specific.

  • Page 5: Removal And Replacement Of Parts

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS Cooking Compartment Left Side Panel COVERS AND PANELS Remove the screws then remove the left side WARNING: DISCONNECT THE panel from the compartment. ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES.

  • Page 6: Cabinet Base Left Side Panel

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Cabinet Base Left Side Panel Cabinet Base Rear Panel Remove the screws then remove the left side Remove the screws then remove the rear panel panel from the cabinet base. from the cabinet base.

  • Page 7: Door Gasket

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Door Gasket Open the door. Remove screws from the gasket guard and gasket plate. Remove the gasket guard and the gasket plate. Remove the plate, nuts, washers and spacers from the handle screws and remove the door handle from the door.

  • Page 8: Door Latch Assembly

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Door Latch Assembly COMPARTMENT CONTROLS Open the door. WARNING: DISCONNECT THE Remove screws from the top and bottom of the ELECTRICAL POWER TO THE door. MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES.

  • Page 9: Main Burner

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Gas combination control valves are not serviceable MAIN BURNER and should not be disassembled. Once the problem has been isolated to this control, replace it. Do not WARNING: DISCONNECT THE attempt to repair the assembly.
  • Page 10 C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Drain the generator and allow steamer to cool, if necessary. Disconnect wires to burner assembly. Disconnect wires from gas combination control valve. Remove the nuts securing the burner to generator. Drop blower end of burner assembly slightly down to clear control box and push all wires out of the way so that burner can be pulled out of...

  • Page 11: Fill And Cold Water Solenoid Valves

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS 19. Move any interfering components out of the way, then push generator slightly forward to disengage feet and remove generator from rear of cabinet. 20. Reverse procedure to install generator. FILL AND COLD WATER SOLENOID VALVES WARNING: DISCONNECT THE...

  • Page 12: Pilot Spark/Probe Flame Sensor

    C24GA SERIES CONVECTION STEAMERS - REMOVAL AND REPLACEMENT OF PARTS Disconnect the water lines for the solenoid valve being serviced and remove the solenoid valve from the unit. Reverse procedure to install solenoid valve. PILOT/SPARK PROBE FLAME SENSOR Remove main burner assembly as outlined under MAIN BURNER in REMOVAL AND REPLACEMENT OF PARTS.

  • Page 13: Service Procedures And Adjustments

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASURE- MENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

  • Page 14: Pilot Burner Adjustment

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS The screw head should not extend out past PILOT BURNER ADJUSTMENT the screw housing. Shut the gas off at combination gas valve. If gas valve energizes, proceed to step 5. Remove cover from manifold pressure tap. If gas valve does not energize, check Install a barb fitting and connect manometer.

  • Page 15: Operating Pressure Switch

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS Turn the power on and let the generator come up to pressure. After the ready light comes on, turn one of the cooking compartment timers on to exhaust steam from the generator. 16.

  • Page 16: Thumb Wheel Adjustment

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS Thumb Wheel Adjustment Inlet Water/Steam Strainer The thumb wheel directly below the microswitch changes both the cut-out (off) and the cut-in (on) points of the operating Pressure Switch. Turn the thumb wheel to obtain the proper cut-out (off) setting.

  • Page 17: Automatic Ignition Systems

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS Spark Ignition Control Test AUTOMATIC IGNITION SYSTEMS The ignition control module and ignition control When the main power switch is turned on and the module transformer are located in the electronics water level is above LLCO, the ignition control module enclosure behind the generator base front cover.

  • Page 18: Ignition Test

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS If 24VAC is present, then replace ignition MANIFOLD PRESSURE control module and retest. It may take up to ADJUSTMENT 3 seconds for the module to reset if main power is turned off then back on. WARNING: DISCONNECT THE If 24VAC is not present, then ensure that ELECTRICAL POWER TO THE...

  • Page 19: Cooking Compartment

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS Verify burner air pressure is 0.35" to 0.4" W.C. Check wiring for damaged insulation (no short circuit). Turn the gas combination control valve on and wait until main burner lights. Check that all connections and terminals are securely fastened (no open circuits).

  • Page 20: Striker Adjustment

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS Striker Adjustment • Safety goggles or face shield. Reinstall the striker with the slot pointing • Measuring cup. upwards and hand tighten nut only. • 1 gallon container for mixing deliming solution. Close the door to center the striker in the oval •...

  • Page 21: Cooking Cycle Test

    C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS 10. After 40 minutes, turn power switch off and allow 10. Observe the floor drain to ensure that live steam steam generator to completely drain, 5 minutes. from the compartments is being cooled by cold water from the cold water condenser solenoid 11.

  • Page 22: Electrical Operation

    C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION ELECTRICAL OPERATION contacts open, the generator fill solenoid is de- WATER LEVEL CONTROLS energized, stopping the flow of water into the generator. Low Level Cut-Off and Differential Control When the water level drops below the low level (LL) The steamer is equipped with three water level probe, power is removed from the inverse latching sensing probes (high, low and low level cut-off) and a...
  • Page 23 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION Turn power switch on. Voltage is removed from: Timer de-energized. Air pressure switch. Operating voltage applied to control Blower motor. compartment after cavity relay is Step-down transformer which latched on. removesvoltage from ignition Water level control (WLC) energized.
  • Page 24 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION Compartment control (Units after Dec. 1, 2005) Refer to schematic diagrams 00855693 & 00856656. Compartment door closed causing door switch to close and Ready Light to illuminate. 120 VAC applied through door switch to timer contact 11 and 21.

  • Page 25: Schematics

    C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION SCHEMATIC DIAGRAMS Generator Schematic Diagram Page 25 of 40 F35425 (February 2006)
  • Page 26 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION Schematic Diagram - Compartment Controls (Standard) F35425 (February 2006) Page 26 of 40...
  • Page 27 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION Schematic Diagram - Compartment Controls (Constant Steam) Page 27 of 40 F35425 (February 2006)

  • Page 28: Component Location Cabinet Base Generator

    C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION COMPONENT LOCATION CABINET BASE GENERATOR F35425 (February 2006) Page 28 of 40...

  • Page 29: Component Function Cabinet Base Generator

    C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION COMPONENT FUNCTION CABINET BASE GENERATOR Water Level Control and Level Sensing Probes....The Water Level Control circuit board and Level Sensing Probe Assembly allow water to enter the generator to fill and maintain the proper water level. These probes will also shut off the heat source to the generator if the water level drops too low.
  • Page 30 C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION Hold Thermostat......The Hold Thermostat energizes the Generator Slow Fill Solenoid Valve when generator temperature reaches the non-adjustable setpoint at 190°F. Drain..........The Drain is located on the lower right of the base and removes steam conden- sate and water from cooking compartments and generator.

  • Page 31: Component Location Cooking Compartment

    C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION COMPONENT LOCATION COOKING COMPARTMENT Page 31 of 40 F35425 (February 2006)

  • Page 32: Component Function Cooking Compartment

    C24GA SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION COMPONENT FUNCTION COOKING COMPARTMENT General The upper section of the steamer consists of two separate cooking compartments. Each compartment functions independently with its own set of controls. Power is supplied to the controls only after the steam pressure rises above 4 psi to energize the compartment latching relay.

  • Page 33: Troubleshooting

    C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING TROUBLESHOOTING General Water Accumulating in Compartment The following paragraphs provide descriptive information Water accumulation on the bottom of the cooking of the most common troubles that can occur in the compartment(s) is primarily condensed steam. Failure steamer.

  • Page 34: Troubleshooting Sequence Of Operation

    C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING TROUBLESHOOTING SEQUENCE OF OPERATION STEP FUNCTION DESCRIPTION Power On Power Switch is switched to the on position. Fill Stage 1 Boiler fills with fast fill water valve, (3.7 GPM). Low Level Probe Confirmation Low Level Probe, (LLCO), is confirmed then power is applied to burner system, fast fill valve is turned off.

  • Page 35: Troubleshooting Chart

    C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING TROUBLESHOOTING CHART SYMPTOM POSSIBLE CAUSES Compartment leaks steam or water Steamer not level. around door. Worn or damaged gasket. Cavity rear strainer clogged. Drain line obstructed. Drain not to an open gap drain. Cold water condenser not operating properly. Cold water condenser solenoid inoperative or plugged.
  • Page 36 C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES Generator does not fill. Water supply not on. Fill solenoid not opening or plugged. Water level control malfunction. Filter clogged. Timer motor does not run. Door open. Door switch inoperative. Timer not getting power. Timer motor inoperative.
  • Page 37 C24GA SERIES CONVECTION STEAMERS - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES Spark igniter not sparking. Incorrect spark gap setting. Poor ground between pilot bracket and burner. Loose, broken or damaged lead wires (including ground) from ignition module to ignitor. Ignitor boot on ignition cable loose, damaged or missing causing excessive ignition voltage leakage.

  • Page 38: Condensed Spare Parts List

    C24GA SERIES CONVECTION STEAMERS - CONDENSED SPARE PARTS LIST CONDENSED SPARE PARTS LIST C24GA SERIES CONVECTION STEAMERS PART NO. DESCRIPTION 419315 POWER CORD 419359 CABLE, IGNITOR, HIGH VOLTAGE 842049 DOOR SWITCH 411500-12 TRANSFORMER 120V/24V 411690-1 TIMER COMPARTMENT 416535-4 SWITCH RELAY 416535-6 RELAY CAVITY COLD WATER CONDENSATE 423813-3...
  • Page 39 Page 39 of 40 F35425 (February 2006)

This manual is also suitable for:

C24ga10C24ga6Ml-136022

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