SERVICE MANUAL VC4E & VC6E SERIES FULL SIZE ELECTRIC CONVECTION OVENS MODEL ML VC4ES 126743 VC4ED 126744 VC4EC 126745 VC6ES 126746 VC6ED 126747 VC6EC 126748 VC4ED 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.
FULL SIZE ELECTRIC CONVECTION OVENS TABLE OF CONTENTS GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FULL SIZE ELECTRIC CONVECTION OVENS Computer Control Operational Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ELECTRICAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL GENERAL INTRODUCTION Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of any model unless the picture or illustration needs to be model specific. Models MODEL VC4ES 4 VC4ED VC4EC VC6ES 4 VC6ED VC6EC NOTES: FEATURES CAVITY TEMPERATURE DOORS COOK DEPTH CONTROL (50/50) TIMER 26.5" Mechanical (KX) Independent 1, 2 1-Hour Dial 1-Hour Dial 26.5" Solid State Independent 1, 3 1, 3 24-Hour Digital 26.
FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL SPECIFICATIONS Electrical AMPERAGE - 3 PHASE/ 60HZ MODEL VC4ES VC4ED VC4EC VC6ES VC6ED VC6EC NOTES: TOTAL POWER (KW) 12.5 RECOMMENDED CIRCUIT PROTECTION 2 PER LINE 1 208V 240V 480V 208V 240V 480V 35 33 15 45 40 20 1. Amperage values in the table are nominal. Tolerance is +5/-10%. 2. Complied in accordance with National Electric Code, ANSI/NFPA 70, latest edition.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS Top Front Cover 1. The top front cover is secured with four (4) screws, two on each side of cover. Remove these screws then remove the cover from the oven. NOTE: If the oven has a mechanical (KX type) thermostat, it must be removed from the control panel first, before removing the control panel. 2. Disconnect the temperature probe leads from the solid state temperature control. 3.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS Left Side Panel 1. Remove the screws which secure the left side of the top front cover, bottom front cover and control panel. 2. Remove the seven screws securing the left side panel. 3. Pull the left side panel out at the bottom then down to remove. 4. Reverse the procedure to install. CONTROL PANEL COMPONENTS Removable Components 1. Remove the control panel as outlined under COVERS AND PANELS. 2.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS COMPONENT PANEL COMPONENTS Removable Components 1. Remove the right side panel as outlined under COVERS AND PANELS. NOTE: If right side panel is not accessible, this component can be serviced by removing the control panel as outlined under COVERS AND PANELS. 2. Disconnect the wire leads to the component being replaced. 3. Remove the component. 4.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS A. 4. 5. Measure the current draw of the heating elements as outlined under HEATING ELEMENT TEST in SERVICE PROCEDURES AND ADJUSTMENTS. From inside the oven cavity, remove the perforated panel from the same side of the element being replaced. Remove probe by pushing it through the oven wall and into the control panel area.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS LEFT SIDE ELEMENTS SHOWN 4. A. Remove the top panel and pull back the insulation to expose the element terminals. B. Remove the lead wires from the element being replaced. From the same element, remove the two clamps holding the element vertical, the screw's securing mounting bracket at the top, and then remove the element. NOTE: The mounting bracket is sealed with RTV which may still hold the element after the screws are removed.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS 1) B. 4. Reverse procedure to install and adjust blower position as outlined under BLOWER ADJUSTMENT in SERVICE PROCEDURES AND ADJUSTMENTS. 10. Reconnect lead wires at the motor, replace conduit and junction box cover. NOTE: Check data plate on motor for wiring schematic. The motor must rotate clockwise when viewed from the shaft end. Motor - perform step 3A and continue procedure.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS A. 4. If replacing window on the left door, remove the handle from the front of the door then remove door seal from the inside edge of the door. 1) Lift out the inner door panel and window assembly. 2) If replacing window on the right door, remove the screws along the inside edge (if applicable) of the door then remove the inner door panel and window assembly. 4.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS 8. Reverse procedure to install door assembly and check for proper adjustment as outlined under DOOR ADJUSTMENT and DOOR SWITCH ADJUSTMENT in SERVICE PROCEDURES AND ADJUSTMENTS. OVEN DOORS (SIMULTANEOUS DOORS) 3. Remove the lower door seal strip to expose the mounting screws of the door assembly. 4. Remove the two (2) lower sill bolts by the lower door shaft and the four (4) counter-sunk screws from the lower sill.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS NOTE: The door assembly is heavy and will drop down once the last screw is removed. If removing door assembly with-out assistance, use caution. ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) 5. Lift up on the door assembly and swing the right side out then move the assembly to the left to clear the slots in the upper door sill. 6. Lay the door assembly on a flat cushioned surface for disassembly. 7.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS NOTE: The hole in the oven cavity wall does not line up straight with the oven cavity outer shell, therefore the probe must be removed at an angle. 5. Reverse the procedure to install. 6. Adjust the thermostat as outlined under MECHANICAL (KX) THERMOSTAT CALIBRATION in SERVICE PROCEDURES AND ADJUSTMENTS. HIGH LIMIT THERMOSTAT 3. Reverse procedure to install. 4.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS NOTE: Remove the old RTV sealer from the cover and mating surfaces inside the oven cavity and apply new high temperature RTV sealer before installing. 4. Reverse procedure to install. 8. Check for proper operation. COOLING FAN INTERIOR LIGHTS 1. NOTE: If right side panel is not accessible, this component can be serviced by removing the control panel as outlined under COVERS AND PANELS. Lamp 1. Remove the racks. 2.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS 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 and follow lockout / tagout procedures, attach test equipment and reapply power to test. B. SOLID STATE TEMPERATURE CONTROL CALIBRATION 1.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS NOTE: Allow the oven to cycle at least two times between adjustments before performing the calculation. a) C. 7. If the average temperature still differs more than 10 °F from the dial setting, adjust the thermostat calibration until the average temperature is within tolerance.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS A. B. A. Turn the power switch OFF. 1) If input voltage to the internal relay is correct, proceed to step 8. If input voltage to the internal relay is not present, problem is not with the temperature control. See TROUBLESHOOTING. 2) If output voltage from the internal relay is correct proceed to step 8.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS TEMPERATURE PROBE TEST (SOLID STATE CONTROL) HEATING ELEMENT TEST The following steps require power to be applied to the unit during the test. Use extreme caution at all times. 1. Turn the power switch ON and set the oven temperature control to the highest setting. 2. Measure the voltage at the heating element terminals and verify it against the data plate voltage.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS BLOWER ADJUSTMENT 1. Remove the blower motor and mounting assembly by following steps 1 through 7 as outlined under BLOWER AND MOTOR in REMOVAL AND REPLACEMENT OF PARTS. 2. Loosen the motor mounting bolts. 3. Adjust the motor position until the blower is parallel to and 1/4 inch away from the motor mounting plate. Check for squareness of the blower to the motor mounting plate at the top, bottom, left and right of the blower. A.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS DOOR ADJUSTMENT 1. 2. 3. Check the doors to make sure they have an equal gap between them and that the vertical edge of the door is parallel to the vertical door seal. If the doors are not positioned in this manner, adjust the doors as described. DOOR STRIKE ADJUSTMENT (INDEPENDENT DOORS) NOTE: For units with serial number starting with 48 made after 8/12/07 and serial number starting with 54 made after 8/26/07. 1.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS DOOR CATCH ROLLER ADJUSTMENT (INDEPENDENT DOORS) 5. NOTE: For units with serial number starting with 48 made before 8/13/07 and serial number starting with 54 made before 8/27/07. 6. Close the doors and check them for proper alignment. A. Doors should be centered and parallel at the top and bottom, in the oven cavity opening. See DOOR ADJUSTMENT.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS DOOR CHAIN ADJUSTMENT (SIMULTANEOUS DOORS) Introduction When the oven doors are in proper adjustment, as the doors come together, the right door will lead the left door in closing by about 1/4 inch. The doors will feel like they are self closing the last 1/2 inch of travel. Procedure 1. Remove the lower sill cover as outline under COVERS AND PANELS in REMOVAL AND REPLACEMENT OF PARTS. 2.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 5. 6. C. Tighten right turnbuckle. D. Tighten locknuts on both turnbuckles. After the last Parameter and Data is viewed, press the Rack 1 key a final time to exit the setup mode and return to operations mode. The current set point temperature will be displayed. • After 1 minute of no key activations, the control will return to operation mode. If the right door leads the left door by more than 3/8 inch: A.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS A. If voltage is correct, SSR is functioning properly. B. If no voltage is present on the load side of SSR terminal 2, the SSR is not functioning properly. 7. Turn the power switch OFF. 8. Replace the SSR and check for proper operation. COMPUTER CONTROL TEMPERATURE CALIBRATION 1. Remove the right side panel as outlined under COVERS AND PANELS. 2. Turn the power switch ON. A. B. 3. 4. 1.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 1) 2) 3) 7. If the thermocouple reading is higher than set point temperature, press the down arrow key and enter a negative offset value that is equal to the number of degrees above the 5°F tolerance. Listed below are the parameters and data you should find in the calibration Mode.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS B. NOTE: If the control was calling for heat when the calibration mode was entered, heating will resume after exiting the test mode. 7. Press the Rack 1 key to accept the default "no" under the "CALY" (calibrate) parameter and advance the display menu to the "LgOt" (logic output) test. In this mode, the control and logic outputs can be turned ON for testing only. A.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Power Switch (S1) . . . . . . . . . . . . . Determines the mode of operation; ON, OFF, or COOL DOWN. Oven Light Switch (S2) . . . . . . . . . Controls the oven cavity lights. Fan Speed Switch (S3) . . . . . . . . . . Controls blower motor speed between High and Low settings (VC4ES/6ES and VC4ED/6ED only). Alarm/Buzzer . . . . . . . . . . . . . . . . .
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION Temperature Probe . . . . . . . . . . . . Senses the oven temperature for the solid state temperature control or the computer control. On oven models using the solid state control, converts the temperature into a resistance valve which is monitored by the temperature control board. The probe is an RTD (resistance temperature detector) of the Thermistor type. As temperature increases the resistance value decreases.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ES/6ES with Mechanical KX thermostat - Plug, Socket and Components Page 31 of 60 F25105 (Rev.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ED/6ED with Solid State Control - Plug, Socket and Components F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION Cook Cycle SEQUENCE OF OPERATION VC4ES, VC6ES with Mechanical KX Thermostat 1. Schematic diagram 6532 will be used to explain the electrical sequence of operation. Cook Cycle 1. 2. Conditions. A. Oven connected to correct voltage and is properly grounded. B. Power switch (S1) OFF. C. Temperature dial set to lowest temperature (fully CCW). D. High limit thermostat CLOSED. E. Oven doors closed (door switch contacts CLOSED). F.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION 1. With the power switch turned ON, power is supplied to "Cook" timer terminal 1. 2. Set "Cook" timer to desired time . A. 3. Cook Cycle 1. Contacts 1 & 3 close, timer motor is energized and timing "down" begins. Time expires on "Cook" timer . A. Contacts 1 & 3 open, timer motor is deenergized and timing stops. B. Contacts 1 & 4 close. 1) 2. Conditions. A. Oven is ON. B. Oven cavity temperature needs to be lowered. 4. B.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION 4. Oven reaches set point temperature. A. Computer control de-activates the output from pin C3-2. 1) 2CON coil de-energized. a. 5. 4. The display flashes HOLD as the oven enters HOLD mode. This is also considered second stage cooking (oven heating stops but product continues to cook on residual heat). A. Power removed from heating elements and heating stops. 5. B. Oven "Heat Light" on the control goes out. C.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION SCHEMATICS VC4ES, VC6ES with Mechanical (KX) Controls, 208-240V Page 37 of 60 F25105 (Rev.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ES, VC6ES with Mechanical (KX) Controls, 480V F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ED, VC6ED with Solid State Temperature Control, 480V F25105 (Rev.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4EC, VC6EC Computer Control, 208-240V (Roast & Hold Standard) Page 41 of 60 F25105 (Rev.
FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4EC, VC6EC Computer Control, 480V (Roast & Hold Standard) F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION WIRING DIAGRAMS F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ES, VC6ES with Mechanical (KX) Control, 480V F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ED, VC6ED with Solid State Temperature Control, 208-240V F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4ED, VC6ED with Solid State Temperature Control, 480V F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4EC, VC6EC Computer Control, 208-240V (Roast & Hold Standard) F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - ELECTRICAL OPERATION VC4EC, VC6EC Computer Control, 480V (Roast & Hold Standard) F25105 (Rev.
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FULL SIZE ELECTRIC CONVECTION OVENS - TROUBLESHOOTING TROUBLESHOOTING 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 and follow lockout / tagout procedures, attach test equipment and reapply power to test. ALL MODELS SYMPTOMS POSSIBLE CAUSES Blower motor doesn’t run with power switch in "ON" "COOL DOWN" or position. 1. 2. 3. 4. 5.
FULL SIZE ELECTRIC CONVECTION OVENS - TROUBLESHOOTING SYMPTOMS POSSIBLE CAUSES No power to oven controls. 1. 2. 3. 4. Main circuit breaker OPEN. Control circuit fuses OPEN. Power switch (S1) inoperative. Transformer (T2) inoperative (480V only). No heat, convection fan motor runs. 1. 2. 3. 4. High limit thermostat OPEN. Heating element malfunction. Contactor malfunction. Temperature control malfunction. No power to temperature control. 1. 2. Power switch (S1) in "Cool Down".
FULL SIZE ELECTRIC CONVECTION OVENS - TROUBLESHOOTING Error Codes In the display window, the error code will alternate between the code and the oven cavity temperature or dashes if the oven is calling for heat (heat light on). The exact error code displayed will depend on the priority assigned to the problem in the EPROM'S software. The lower the error code number, the higher the priority.
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FULL SIZE ELECTRIC CONVECTION OVENS F25105 (Rev. A, October 2007) Printed in U.S.A.
