SERVICE MANUAL VC3ED FULL SIZE ELECTRIC CONVECTION OVEN VC3ED ML-137013 - NOTICE This Manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. 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.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN TABLE OF CONTENTS GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL GENERAL INTRODUCTION FEATURES MODEL CAVITY DEPTH TEMPERATURE CONTROL DOORS (50/50) COOK TIMER VC3ED 26.5" Solid State Independent 1-Hour Dial NOTE: Stainless steel doors with window (standard) • INSTALLATION HUSKEY™ TF-1000 grease or equivalent high temperature non-stick grease. Refer to OPERATORS MANUAL for procedures related to Installation, Operation and Cleaning.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL AMPERAGE - 1 PHASE/ 60HZ MODEL VC3ED NOTES: RECOMMENDED CIRCUIT PROTECTION 2 TOTAL POWER (KW) 208V 240V 480V 208V 240V 480V 12.5 60 52 26 80 70 35 PER LINE 1 1 Amperage 2 Complied values in the table are nominal. Tolerance is +5/-10%. in accordance with National Electric Code, ANSI/NFPA 70, latest edition.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS REMOVAL AND REPLACEMENT PARTS COVERS AND PANELS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Bottom Front Cover 1. The bottom front cover is secured with four (4) screws, two on each side of cover. Remove these screws then remove cover from oven. Fig. 1 2. Reverse procedure to install. Verify bottom cover is seated under front plate. Control Panel Cover 2.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS 2. Loosen screws on left side of front panel and top cover screw. 3. Remove screws along right side and bottom of front panel. Fig. 5 5. Slide right side rear panel up and to the right to remove. 6. Reverse procedure to install. Fig. 4 4. Slide right side front panel out. 5. Reverse procedure to install. Disconnect the electrical power to the machine and follow lockout / tagout procedures.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS CONTROL PANEL COMPONENTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Removable Components 1. Remove the CONTROL PANEL. 2. Remove the component being replaced. 3. Reverse the procedure to install the replacement component, then check oven for proper operation. Fig. 6 4. Lift up and pull away to remove. 5. Reverse procedure to install.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS Fig. 10 5. Remove probe by pushing it through the oven wall and down through upper panel into the control panel area. Fig. 8 2. Remove upper panel and pull out insulation cutaway. Fig. 11 6. Reverse the procedure to install the replacement probe. 7. Adjust the temperature control as outlined under SOLID STATE TEMPERATURE CONTROL CALIBRATION under Service Procedures and Adjustments. HEATING ELEMENTS Fig. 9 3.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS BLOWER AND MOTOR Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Take out the racks and rack supports. 2. Lift off FAN COVER. 3. If replacing: A. Blower Only - Loosen bolts on blower hub and using a bearing puller, remove blower from motor shaft. 1) Fig. 12 3. Remove racks from cavity. 4. Remove FAN COVER. B. Loosen element screws on side wall. 4. 5.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS 8. Remove motor mounting bolts and flat washers then lift the motor from the mounting plate. 9. Position the replacement motor on the motor mounting plate and install mounting bolts and washers. Hand tighten mounting bolts only. 14. Replace the baffle panel. 15. Remove cardboard from the bottom of the oven cavity. 16. Check oven for proper operation then replace rack guides and racks.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) 3. HIGH LIMIT THERMOSTAT Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Remove the screws that attach roller latch assembly to door. Reverse the procedure to install the replacement door and check oven for proper operation. Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Take out racks from the oven.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS INTERIOR LIGHTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Do not touch the Halogen lamp with bare hands. If lamp is exposed to oil from the skin, the life will be reduced. Ensure lamp is free from oil and dirt before replacing. Bulb Replacement 1. Pull lamp cover off. 2. Grasp lamp using a clean cloth and remove from lamp assembly. Fig. 22 4. Disconnect wires. 5.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS Fig. 23 3. Loosen the tab screw holding the fan to the component panel. Rotate the tab so that the fan will clear and remove the fan. 4. Reverse the procedure to install the replacement fan and check for proper operation. NOTE: The fan must be installed so air is pulled from outside the rear of the oven and blown into the control area.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS SOLID STATE TEMPERATURE CONTROL TEST Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures. If test points are not easily accessible, disconnect power and follow Lockout/Tagout procedures, attach test equipment and reapply power to test. 1.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS 2) 8. If output voltage from the internal relay is correct proceed to step 8. If output voltage from the internal relay is not correct, check temperature probe as outlined under TEMPERATURE PROBE TEST (SOLID STATE CONTROL). Set the temperature control to the minimum setting. NOTE: Oven temperature must be above 300°F. 9. NOTE: If right side panel is not accessible, this component can be serviced by removing CONTROL PANEL. 2.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS 7. A. If the control differential is less than 20°F, the temperature control circuit is functioning properly. Proceed to step 7. B. If the control differential is more than 20°F, check the temperature probe as outlined under Temperature Probe Test. C. If the control differential is more than 20°F and the probe passes the test parameters, then temperature controller is malfunctioning.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS HEATING ELEMENT VALUES HEATING ELEMENT TEST VOLT. Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures. If test points are not easily accessible, disconnect power and follow Lockout/Tagout procedures, attach test equipment and reapply power to test. 1.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS Fig. 26 Fig. 28 2. Open and close the doors several times while observing the roller latch and strike plate operation. A. 3. Fig. 27 4. Reverse the procedure to install. DOOR STRIKE ADJUSTMENT INDEPENDENT DOORS) 1. Open the doors and inspect door strike for proper shape. A. Bend strike plate.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Power Switch (S1) . . . . Determines the mode of operation; ON, OFF, or COOL down. Oven Light Switch (S3) . . . . . . . . . . . . . . . . . . . Controls the oven cavity lights. Fan Speed Switch (S2) . . . . . . . . . . . . . . . . . . . Controls blower motor speed between High and Low settings. Alarm/Buzzer . . . . . . . . . Signals the end of a "Cook" cycle when cooking time expires.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION COMPONENT LOCATION Fig.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION Fig.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION Fig. 31 SEQUENCE OF OPERATION Cook Cycle 1. 2. Conditions. E. Oven doors closed (door switch contacts CLOSED). F. Oven cavity temperature below 140°F. Power switch (S1) turned ON. A. Power ON light (Amber) comes ON. B. Solid state temperature control energized. A. Oven connected to correct voltage and is properly grounded. B. Power switch (S1) OFF. 1) C. Temperature dial set to lowest temperature (fully CCW).
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION C. Blower motor energized. B. NOTE: Motor speed (Hi/Low) depends on position of fan speed switch (S2). 3. 4. D. Component cooling fan energized. E. Power to oven cavity light switch (S3) wire #1. Turns cavity lights ON/OFF; does not affect "Cook" cycle. 5. 1) Buzzer energized and sounds. NOTE: The buzzer continues to sound until the timer dial is set to the OFF position or additional time is set. Cool Down Cycle 1.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION SCHEMATICS AND WIRING DIAGRAMS VC3ED 208-240V Wire Diagram F45534 (0415) Page 24 of 31
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION VC3ED 208-240V WIRE DIAGRAM TABLE ITEM DESCRIPTION A SWITCH, TOGGLE S.P.S.T B FAN SWITCH, TOGGLE D.P.D.T C LIGHT, 250V, CLEAR C1 LIGHT, 250V, CLEAR D WIRE SET, LIMIT SWITCH E TEMP. CONTROL - NCC F TIMER, 230 VOLT (1-HR, 60 HZ.) (5-HR, 60 HZ.) G BUZZER 230 VOLT H DOOR SWITCH, 2HP J BLOCK,PORCELIAN ASSEMBLY K LIMIT CONTROL 550F L ELEMENT ASSY, 12.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION VC3ED 208-240V SCHEMATIC F45534 (0415) Page 26 of 31
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION VC3ED 480V Wire Diagram VC3ED 480V WIRE DIAGRAM TABLE ITEM DESCRIPTION A SWITCH, TOGGLE S.P.S.T B FAN SWITCH, TOGGLE D.P.D.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION VC3ED 480V WIRE DIAGRAM TABLE F45534 (0415) ITEM DESCRIPTION E TEMP. CONTROL - NCC F TIMER, 230 VOLT (1-HR, 60 HZ.) (5-HR, 60 HZ.) G BUZZER 230 VOLT H DOOR SWITCH, 2HP J BLOCK,PORCELIAN ASSEMBLY K LIMIT CONTROL 550F L LCOE ELEMENT ASSY, 12.5 KW (208 VOLT) (240 VOLT) P PROBE,THERMISTOR R FUSE & HOLDER 15A S TERMINAL BLOCK 3 POLE T CONTACTOR 40A 3 POLE V MOTOR 1/2 HP. 2 SPEED G.E. X SWITCH, TOGGLE D.P.D.T.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION VC3ED 480V SCHEMATIC Page 29 of 31 F45534 (0415)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - 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 and follow Arc Flash procedures. If test points are not easily accessible, disconnect power and follow Lockout/Tagout procedures, attach test equipment and reapply power to test.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - TROUBLESHOOTING SYMPTOMS Uneven Cooking. Intermittent operation problems. Oven will not turn on. No heat, convection fan motor runs. No power to temperature control. Door does not seal or shut properly POSSIBLE CAUSES 1. Convection Fan motor speed/direction. 2. Air flow Baffles missing or damaged. 3. Line voltage incorrect. 4. High limit thermostat malfunction. 5. Contactor malfunction. 6. Heating element(s) malfunction. 7.