SERVICE MANUAL VEC CONVEYOR OVENS ELECTRIC CONVEYOR OVENS MODEL ML VEC3018 10KW 15KW 126198 126401 VEC4018 126199 VEC3624 114836 VEC3632 114837 VEC3624 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. This manual is not intended to be all encompassing.
ELECTRIC CONVEYOR OVENS TABLE OF CONTENTS GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRIC CONVEYOR OVENS - GENERAL GENERAL GENERAL SPECIFICATIONS 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. INSTALLATION NOMINAL AMPS PER LINE WIRE MODEL 3018 Generally, installations are made by the dealer or others contracted by the dealer or owner. Detailed installation instructions are included in the "Instructions" manual which is sent with each unit.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS CONTROL PANEL COMPONENTS WARNING: UNPLUG UNIT BEFORE SERVICING. Front Panel The following are located in the control panel: 1. Lift up on the panel handle. • Solid state relays. 2. Pull out on the bottom of the panel. • Transformer. 3. Reverse the procedure to install. • Power switch and pilot light. Air Distribution Panels • Speed control. 1.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS 5. Position the end of the probe as indicated in chart. MODEL DIMENSION “A” 3018 2-1/4" 9-1/4" 1/2" 4018 2-1/4" 10-5/8" 1/2" 3632 / 3624 1-3/4" 15-3/4" 1-3/16" 6. DIMENSION “B” A. Remove the nuts from the mounting studs. B. Push down on the rear of the motor to dislodge the front sheet metal shield from the slot in the air chamber. C. Pull the motor assembly from the air chamber.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS HIGH LIMIT THERMOSTAT COOLING FANS WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: UNPLUG UNIT BEFORE SERVICING. 1. Remove back panel from control housing. 1. 2. Pull off thermostat cover and remove screws securing thermostat to mounting bracket. Remove the rear motor housing panel if replacing that fan, or the rear control housing panel if replacing that fan. 3.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS 4. Pull the entire conveyor assembly from the oven. 4. Remove splicing strands by unhooking ends and squeezing ends together and withdrawing thru link. 5. Assemble in reverse order. Adjust conveyor belt tension as outlined in “CONVEYOR BELT TENSION”. NOTE: Conveyor will need to be lifted so crumb tray slides will clear as assembly is pulled out. 5. To replace conveyor, reverse the procedure. Conveyor Belt 1.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS CONVEYOR BELT SPLICING Install the conveyor belt so that it always runs with the closed end of the loops in the direction of travel as indicated by arrow. NOTE: The arrows in the belt illustrate the movement of the splicing strand between steps. When bending the splicing strand, try to limit bending to straight portions of the strand rather than in the “Z” bend area. Splice one side completely before starting the other side.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS CONVEYOR DRIVE MOTOR CONVEYOR DRIVE CHAINS WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: UNPLUG UNIT BEFORE SERVICING. 1. Perform steps 1 thru 3 in “CONVEYOR DRIVE CHAINS”. 1. Remove the motor housing as outlined under “COVERS AND PANELS”. 2. Note location of sprocket on motor shaft and remove sprocket. 2. 3. Remove socket head screws securing motor and remove motor.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS HEAT ELEMENTS 4. Identify and remove power leads from elements. 5. Remove screws securing heater assembly. 6. Carefully pull heater assembly out of chamber. 7. Replace elements. WARNING: UNPLUG UNIT BEFORE SERVICING. 1. Remove the control housing as outlined under “COVERS AND PANELS”. Models 3018 and 4018 1. Remove two screws securing component mounting assembly. 2. Swing out component mount assembly. 3. Remove insulation and cover.
ELECTRIC CONVEYOR OVENS - REMOVAL AND REPLACEMENT OF PARTS Models 3624 and 3632 WARNING: UNPLUG UNIT BEFORE SERVICING. 1. Remove the control housing as outlined under “COVERS AND PANELS”. 2. Remove oven back panel and insulation. 3. Remove high limit thermostat sensing bulb. 4. Identify and remove bottom wires. 5. Remove inside panel. 6. Carefully pull out element tray. 7. Replace elements. 8. Reverse procedure to install.
ELECTRIC CONVEYOR OVENS - 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. 7. BLOWER ADJUSTMENT WARNING: UNPLUG UNIT BEFORE SERVICING. 1.
ELECTRIC CONVEYOR OVENS - SERVICE PROCEDURES AND ADJUSTMENTS A. This is done by holding the “S” key in while pressing the arrow keys to raise or lower the temperature. Otherwise the display shows the current measured temperature. 4. Allow the heat to stabilize at the set point. The heat should be occasionally turning off and on. 5. Subtract the temperature tester measured value from 500 and write down the subtracted value. This is the offset value that will be entered into the controller soon. 6.
ELECTRIC CONVEYOR OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 2. If cooking is not even, adjust the air directional screw on top of the conduit. A. Loosen the lock nut. B. Turn the screw clockwise to shift the air from front to back C. Counterclockwise to shift the air from back to front. D. Tighten the lock nut. 3. Loosen sprocket setscrews and move sprockets as necessary for straight chain tracking. 4.
ELECTRIC CONVEYOR OVENS - SERVICE PROCEDURES AND ADJUSTMENTS CONVEYOR BELT TENSION HEAT ELEMENT TEST WARNING: UNPLUG UNIT BEFORE SERVICING. WARNING: UNPLUG UNIT BEFORE SERVICING. Conveyor must be tight enough so that when loaded with product and running, its links do not catch on the conveyor guides at the drive end of the conveyor. 1. Access heat elements as outlined in REMOVAL AND REPLACEMENT OF PARTS. 2. Disconnect wires to individual elements and test according to chart. 1.
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Power Switch . . . . . . . . . Pilot Light . . . . . . . . . . . High Limit Thermostat . Speed Control . . . . . . . . Temperature Control . . . DC Drive Motor . . . . . . . Cooling Fan . . . . . . . . . . Solid State Relays . . . . . Blower Motor . . . . . . . . . Temperature Probe . . . . Power Supply Module . . Transformer . . . . . . . . . . Heat Elements . . . . . . . .
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION COMPONENT LOCATION Page 17 of 24
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION OVEN SEQUENCE OF OPERATION 1. 2. 3. 4. 5. Conditions A. Power switch off. B. Belt switch off C. Speed selection switch to desired position. D. High limit thermostat closed. E. Oven below set point. F. Correct voltage supplied to oven. Power switch turned on. A. 110VAC control voltage to motor and fan solid state relay, high limit thermostat, temperature control, speed control and DC power supply module.
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION SCHEMATIC DIAGRAM Page 19 of 24
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION WIRING DIAGRAMS Page 20 of 24
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION Page 21 of 24
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION Page 22 of 24
ELECTRIC CONVEYOR OVENS - ELECTRICAL OPERATION Page 23 of 24
ELECTRIC CONVEYOR OVENS - TROUBLESHOOTING TROUBLESHOOTING 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. SYMPTOMS POSSIBLE CAUSES 1. 2. 3. 4. 5. 6. 1. 2. 3. 4. Line voltage incorrect. Master switch malfunction. Fuse open. Solid state relay inoperative. Motors inoperative.
