Vulcan-Hart VCE10F 126179 Service Manual
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Vulcan-Hart VCE10F 126179 Service Manual

Vulcan-hart electric combi ovens service manual
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VCE10F SHOWN ON STAND
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-Hart, is prohibited
A product of VULCAN-HART
Form 24659 (September 1999)
SERVICE MANUAL
ELECTRIC
MODEL
VCE6H
VCE10H
VCE10F
VCE20H
VCE20F
- NOTICE -
.
COMBI
OVENS
ML
126177
126178
126179
126172
126173
LOUISVILLE, KY 40201-0696

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  • Page 1 Vulcan Service Technician. Reproduction or other use of this Manual, without the express written consent of Vulcan-Hart, is prohibited A product of VULCAN-HART Form 24659 (September 1999)

  • Page 2: Table Of Contents

    TABLE OF CONTENTS GENERAL ................4 Introduction .
  • Page 3 ELECTRICAL OPERATION ............. . 37 Component Function .

  • Page 4: General

    INTRODUCTION General The procedures in this manual apply to all models unless otherwise specified. All of the information, illustrations and specifications contained in this manual are based on the latest product information available at the time of printing. Combi Ovens The Electric Combi ovens provide convection heat, steam heat or a combination of both in a single compartment cooking chamber.

  • Page 5: Electrical

    Electrical MODEL VCE6H VCE10H VCE10F VCE20H VCE20F NOTES: CONVECTION HEAT MODEL ELEMENTS VCE6H VCE10H VCE10F VCE20H VCE20F NOTES: 1. Amperage values in the table are nominal. Tolerance is +5/-10%. 2. Convection heater currents must be measured in full power convection heat mode.

  • Page 6: Oven Controls

    ELECTRIC COMBI OVENS - GENERAL OVEN CONTROLS PROGRAMMABLE DELUXE MANUAL STANDARD MANUAL Page 6 of 68...

  • Page 7: Water Conditioning

    WATER CONDITIONING Furnishing the steam generator with treated water to reduce scale formation is important. Scale formation will reduce steam output, cause premature component failure, and shorten equipment life. Most water supplies contain scale producing minerals such as Calcium and Magnesium. As steam is generated, the minerals remain and dissolve into the water.

  • Page 8: Removal And Replacement Of Parts

    REMOVAL AND REPLACEMENT OF PARTS RACK GUIDE/FILTER/EXHAUST ASSEMBLY Turn the oven off. Remove the racks (if equipped). Push the rack guide to rear of oven to remove the rack guide tabs from slots in the exhaust assembly (10 level). Lift the rear of the rack guide up and pull the guide out of the oven cavity.

  • Page 9: Oven Temperature Probe

    Rear Panel Remove the screws from the rear oven panel. Hold the panel in place before removing the last panel screw. Access the inside edge of the panel at the bottom left and disconnect the ground wire (if present). Lower the panel to remove from oven. Reverse procedure to install.

  • Page 10: Programable Oven Control

    PROGRAMABLE OVEN CONTROL WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. CAUTION: Certain components in this system are subject to damage by electrostatic discharge during field repairs.

  • Page 11: Manual Oven Controls

    Remove the display/keypad board from the control panel by removing the mounting nuts. Reverse procedure to install. MANUAL OVEN CONTROLS WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 12: Blower And Motor

    Release the clips on the back of the mounting rail. Reverse procedure to install. BLOWER AND MOTOR WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 13: Blower Motor Shaft Seal

    Installation Mount the motor to the back of the oven. Tighten the bolts enough to hold the motor in place, but allow some movement. Ensure that the motor shaft is centered (use shaft centering tool) in the motor shaft hole and tighten mounting bolts.

  • Page 14: Thermal Fuse(S)

    Steam Generator Turn off the water supply to the steam generator. Remove the right side panel as outlined under “COVERS AND PANELS”. Remove the thermal fuse and protective sleeve from the heater thermowell. Disconnect the heating element lead wire connections. Remove the heating element from the steam generator by removing the mounting nuts.

  • Page 15: Steam Generator Drain Pump

    STEAM GENERATOR DRAIN PUMP Turn off the oven and allow the steam generator to drain. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 16: Water Level Sensors And Water Equalization Tube

    Sealing Washer Remove the right side panel as outlined under “COVERS AND PANELS”. Open the oven door and remove the rack guide, filter and exhaust assembly as outlined under “RACK GUIDE/FILTER/EXHAUST ASSEMBLY”. WARNING: THE FOLLOWING STEPS REQUIRE POWER TO BE APPLIED TO THE UNIT DURING THE ADJUSTMENT.

  • Page 17: Steam Generator Tank

    Remove the water equalization tube. Reverse procedure to install. STEAM GENERATOR TANK Turn the oven off and allow the steam generator tank to drain. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 18: Oven Door

    OVEN DOOR WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Removal Remove the left and right side panels as outlined under “COVERS AND PANELS”. Disconnect the lead wires to the lamp on the power supply board terminal block and route them so they can be pulled through the hole in...

  • Page 19: Door Lamp

    DOOR LAMP WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Remove the screws holding the cover and gasket. Pull the lamp and socket assembly out from the door.

  • Page 20: Door Magnetic Reed Switch

    DOOR MAGNETIC REED SWITCH WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Remove the right side panel as outlined under “COVERS AND PANELS”. Remove the nuts that secure the door switch mounting bracket to the bottom of the control panel.

  • Page 21: Oven Cavity Seal

    Remove the spring and positioning plate from the locking arm. Reverse procedure to install and adjust as outlined under “OVEN DOOR ADJUSTMENT” in “SERVICE PROCEDURES AND ADJUSTMENTS”. Disassembly Remove the three screws that secure the motor and switch assembly. Remove the motor, gear box and switch assembly from the locking mechanism.

  • Page 22: Power Supply Board And Transformer

    POWER SUPPLY BOARD AND TRANSFORMER WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Remove the right side panel as outlined under “COVERS AND PANELS”. Disconnect lead wire connections and ribbon cable from the board.

  • Page 23: Oven Cavity Drain

    OVEN CAVITY DRAIN WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Open the oven cavity door. Lift up the oven cavity drain grate to remove. Unscrew t-bar nut to release drain at the front.

  • Page 24: Service Procedures And Adjustments

    SERVICE PROCEDURES AND ADJUSTMENTS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE 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. CONFIGURATION MODE - PROGRAMABLE CONTROL WARNING: DISCONNECT THE ELECTRICAL...

  • Page 25: Diagnostic Test Mode - Programable Control

    NOTE: The temperature selected in the table below will also be the highest starting point temperature available, when the steam mode is selected. ELEVATION TEMPERATURE (FT) (°F) Sea level to 500 500 to 1000 1,000 to 2,000 2,000 to 3,000 3,000 to 4,000 4,000 to 5,000 5,000 to 6,000...

  • Page 26: Configuration Mode - Manual Controls

    The DISPLAY and LED test consists of flashing all displays and LED’s. The word “test” will flash intermittently as the temperature display is tested. Verify all the DISPLAYS and LED’s are flashing. This test will continue until a key is pressed to advance to the next step.
  • Page 27 dSCL is displayed in the time display and the number of clean cycles completed (deliming of steam generator) is displayed in the temperature display. The number cannot be changed or modified. Press the TIME key to advance to the next step. The EPROM revision level is displayed in the time display and “Conf”...

  • Page 28: Diagnostic Test Mode - Manual Controls

    CONVECTION FAN MOTOR CONVECTION FAN MOTOR TYPE POSITION 1 (MINIMUM) 1 motor Leroy-Somer (Hanning) 1 motor Brook-Crompton * 2 motors Leroy-Somer (Hanning) 2 motors Brook-Crompton 1 motor Leroy-Somer (Hanning) and 1 motor Brook-Crompton (*) Ovens are shipped from the factory with this NOTE: motor and the oven control is configured accordingly.

  • Page 29: Service Error Lights

    CODE RELAY COMPONENT door motor cavity vent motor K3, K6 contactor KM1 (half power, full speed) cooling fan(s) and door light only K3, K4 water injection solenoid (humidifier) drain pump K3, K5 water fill solenoid contactor KM2 (half power, half speed); K3, K7 on 20 levels only, contactor KM3 and drain cool down solenoid.

  • Page 30: Heating Elements

    HEATING ELEMENTS WARNING: THE FOLLOWING STEPS REQUIRE POWER TO BE APPLIED TO THE UNIT DURING THE TEST. USE EXTREME CAUTION AT ALL TIMES. Measure the voltage at the heating element terminals and verify it against the data plate voltage. If voltage is incorrect, find the source of the problem.
  • Page 31 Position the door roller against the “striking” edge of the locking arm but do not close the door. Observe the position of the door roller to the locking arm. Adjust the door roller so it mates at the “striking edge” (bottom of the sloped edge) of the locking arm.

  • Page 32: Buzzer Adjustment - Programable Control

    If the space is larger at the hinge end, remove shim(s) from behind the hinges or from in front of the door locking mechanism. If the space is smaller at the hinge end, add shim(s) behind the hinges or in front of the door locking mechanism.

  • Page 33: Clean Cycle Mode - Steam Generator Deliming

    To adjust the buzzer volume, turn the buzzer volume adjustment screw until the desired volume is obtained. Once the buzzer frequency and volume are set to the desired levels, press the START key to save the setting and exit the configuration mode.
  • Page 34 If there is no water treatment system installed in the water line to the steam generator, then add an amount of vinegar equal to the tank volume for the combi model. See table below. Add the vinegar to the steam generator through the opening in the oven cavity.

  • Page 35: Battery Backup - Programable Control

    BATTERY BACKUP - PROGRAMABLE CONTROL The battery backup module allows the SRAM (static ram) to retain the configuration and program information in memory if there is a power loss. The battery backup may come in a two piece configuration of an SRAM chip mounted onto a battery module or a one piece SRAM and battery module combination.
  • Page 36 Battery Replacement WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. NOTE: When removing and replacing the SRAM/Battery module, it is recommended that a 28 pin EPROM extraction tool and a 28 pin EPROM insertion tool be used.

  • Page 37: Electrical Operation

    ELECTRICAL OPERATION COMPONENT FUNCTION 1A Relay Board ....2A Oven Control ....3A Display/Keypad Board ..F1 Fuse .
  • Page 38 2SOL Drain Cool Down Solenoid Valve ..3SOL Water Fill Solenoid Valve ....1SW Door Magnetic Reed Switch ....2SW Door Mech Switch .
  • Page 39 KM5 (5CON) ....KM6 (6CON) ....KM7 (7CON) ....1HTR Heating Element .

  • Page 40: Component Location

    ELECTRIC COMBI OVEN - ELECTRICAL OPERATION COMPONENT LOCATION Page 40 of 68...
  • Page 41 ELECTRIC COMBI OVEN - ELECTRICAL OPERATION Page 41 of 68...

  • Page 42: Sequence Of Operation

    SEQUENCE OF OPERATION The convection and steam heating theory outlined below, covers the programable and manual oven controls unless otherwise stated. Heating Mode and Cavity Fan Speeds KM1 = 1/2 power and full speed cavity fan(s). KM2 = 1/2 power and half speed cavity fan(s). KM1 + KM2 = Full power and full speed cavity fan(s).

  • Page 43: Steam Pre-Heat

    On 20 level machines (half and full size) the heating mode regulation is the same but with these additional points to remember: Top and bottom heating elements operate independently and correspond to the top and bottom cavity temperature probes. Display always shows the lowest temperature. If the cavity temperature exceeds the set point temperature, the heating elements will not turn on until both cavity temperature probes sense a...

  • Page 44: Water Injection (Humidifier)

    Water Injection (Humidifier) Water can be injection onto the convection heating elements in the oven cavity and is used in these three ways: Automatic Cooling (Programable & Manual Controls) - If the steam mode is selected after cooking in convection or combi mode and the cavity temperature is above 302°F, water is injected intermittently to cool the oven cavity.

  • Page 45: Programable Oven Control

    Programable Oven Control This sequence of operation is written for the combi oven models that use the programable oven control. The three heating modes outlined below (convection, steam and combi) are for manual operation of the oven. The automatic cooking methods (timed, temperature probe and delta t) are then outlined.
  • Page 46 Press the temp key to set the operating temperature (default setting is 302°F; adjustable range is 35 to 518°F). Press the temperature up or down keys to adjust the setting. Start/Stop key is pressed to begin the cooking cycle. Start/Stop LED on. Convection heating elements energized and cycle as described under “HEATING REGULATION”.
  • Page 47 Start/Stop LED off. Steam generator heating elements de- energized. Cavity fan motor(s) de-energized. Steam mode remains selected with LED Cavity vent remains closed. The operating temperature remains as entered unless the heating mode or operating temperature setting is changed or the oven is turned off. Combi Mode Conditions exist as described in “POWERING CONTROL”.
  • Page 48 Cooking time expires. Buzzer sounds for approximately 10 seconds on and 45 seconds off. The buzzer continues to cycle at these times until the Start/Stop key is pressed. Convection and/or steam generator heating elements de-energized. Cavity fan motor(s) remain energized. Press the Start/Stop key to end the cooking cycle.

  • Page 49: Manual Oven Controls

    Press the temp up or down keys to set the Delta T differential. Press probe key. Press the time up or down keys to set the final product temperature. Press Start/Stop key to begin the cooking cycle. NOTE: The Delta T differential can not be adjusted without stopping and starting the cycle again.
  • Page 50 Cavity vent open. 240VAC supplied to relay board. Steam generator empty. Water supply on. Rotate the selector knob to one of the cooking modes (Heat, Steam or Combi) to turn the oven on. Oven control runs a self diagnostic test. “HHH”...
  • Page 51 Steam Mode Conditions exist as described in “POWERING CONTROL”. With the selector knob rotated to STEAM, the cooking cycle begins.. Time LED is on and “- -:- - “ is displayed in the time display. Cavity set point temperature (default) is displayed in the temperature display.
  • Page 52 Drain cool down solenoid energized. NOTE: Whenever steam generator heating elements are on, the drain cool down solenoid is energized. Cavity fan motor(s) energized. Press the temp key to set the operating temperature (the last temperature that was set is displayed; adjustable range is 35 to 518°F). The temperature symbol (°F or °C) will flash in the temperature display to indicate the cavity set point temperature can be adjusted.
  • Page 53 NOTE: To display the actual probe temperature for 5 seconds, press and hold the probe key. Press Start key to begin the cooking cycle. Start LED on. NOTE: The probe temperature can be adjusted throughout the cooking cycle by pressing the probe key and rotating the adjustment.

  • Page 54: Wiring Diagrams

    ELECTRIC COMBI OVEN - ELECTRICAL OPERATION WIRING DIAGRAMS 6 Level Page 54 of 68...
  • Page 55 ELECTRIC COMBI OVEN - ELECTRICAL OPERATION Page 55 of 68...

  • Page 56: Level

    ELECTRIC COMBI OVEN - ELECTRICAL OPERATION 10 Level Page 56 of 68...
  • Page 57 ELECTRIC COMBI OVEN - ELECTRICAL OPERATION Page 57 of 68...

  • Page 58: 20 Level

    ELECTRIC COMBI OVEN - ELECTRICAL OPERATION 20 Level Page 58 of 68...
  • Page 59 ELECTRIC COMBI OVEN - ELECTRICAL OPERATION Page 59 of 68...

  • Page 60: Electric Heater Circuits

    ELECTRIC COMBI OVEN - ELECTRICAL OPERATION ELECTRIC HEATER CIRCUITS Page 60 of 68...
  • Page 61 ELECTRIC COMBI OVEN - ELECTRICAL OPERATION Page 61 of 68...
  • Page 62 ELECTRIC COMBI OVEN - ELECTRICAL OPERATION Page 62 of 68...

  • Page 63: Troubleshooting

    WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE 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. Before performing any of the troubleshooting checks listed below, run the oven control in “DIAGNOSTIC TEST MODE”...
  • Page 64 SYMPTOM Convection heat error light and steam heat error light on. Cavity fan motor inoperative and cavity fan error light on. Oven inoperative and displays are blank. One or more service error light(s) at bottom of keypad come on. Convection heaters inoperative. POSSIBLE CAUSES Cavity high temperature limit(s) open (manual reset).
  • Page 65 SYMPTOM No steam generation but cavity fan operates. Oven displays “888F” or “888C” in the temperature display. Oven displays “999F" or “999C" in the temperature display. POSSIBLE CAUSES Cavity temperature is above steam temperature set point and oven is performing automatic cooling before steam generation can start.
  • Page 66 SYMPTOM Temperature display for cavity or cooking probe does not change after starting a cook cycle. Cooking probe temperature displays “32” in the time display. After approximately 10 minutes, “00"or “32” flashes and the buzzer sounds intermittently. Oven will not operate in probe mode.
  • Page 67 SYMPTOM Heating mode selector switch, adjustment knob or keypad button(s) inoperative (manual control). Door will not lock. “HHH” in the time display and “025” in the temperature display. (Programable control only) Water in component area. Water in bottom of cavity. Cavity vent not operating.
  • Page 68 SYMPTOM Inner door glass breaks. Steam generator drains continually. Cavity fan motor squeaks. Cavity lamp not working. Steam leaks around door. Form 24659 (September 1999) POSSIBLE CAUSES Glass installed incorrectly with conductive side toward oven cavity. See “OVEN DOOR” under “REMOVAL AND REPLACEMENT OF PARTS”.

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