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VC4G & VC6G SERIES FULL SIZE

CONVECTION OVENS

VC4GS ML-126610

VC4GD ML-126611

VC4GC ML-136494

VC6GS ML-126612

VC6GD ML-126613

VC6GC ML-136495

- 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. Procedures for which you do

not have the necessary tools, instruments and skills should be

performed by a trained Vulcan Service Technician.

The reproduction, transfer, sale or other use of this Manual,

without the express written consent of Vulcan, is prohibited.

This manual has been provided to you by ITW Food Equipment

Group LLC ("ITW FEG") without charge and remains the property

of ITW FEG, and by accepting this manual you agree that you will

return it to ITW FEG promptly upon its request for such return at

any time in the future.

SERVICE MANUAL

A product of Vulcan-Hart 3600 North Point Blvd Baltimore, MD 21222

F24682 Rev. C (0315)

Summary of content (74 pages)

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SERVICE MANUAL VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS VC4GS VC4GD VC4GC VC6GS VC6GD VC6GC ML-126610 ML-126611 ML-136494 ML-126612 ML-126613 ML-136495 - 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.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS TABLE OF CONTENTS SERVICE UPDATES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SERVICE UPDATES - VC4G / VC6G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PROBE TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE UPDATES SERVICE UPDATES SERVICE UPDATES - VC4G / VC6G March 2015 Updated Photos Added to the Following Data Modules • GAS BURNER • GAS ORIFICE • GAS SOLENOID VALVE • ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) • HIGH LIMIT THERMOSTAT • GAS PRESSURE ADJUSTMENT (units up to February 2015) Added New Data Module • GAS VALVE PRESSURE CHECK (units after February 2015) VC4GC AND VC6GC Serial Number Breaks • SPECIFICATIONS Updated Data Module • SOLID
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - 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 FEATURES MODEL CAVITY DEPTH OPTIONS TEMPERTURE DOORS CONTROL COOK (50/50) TIMER COOK TIMER COOK OR & HOLD TIMER HOLD BLOWER 208/240/60/1 VC4GS 26.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - GENERAL Units after Serial Number Break (VC4GD 481835388, VC6GD 481835406, VC4GD 541077665) Natural Gas - 50,000 BTU input at 5.0 in. W.C. Propane Gas - 44,000 BTU input at 10.0 in. W.C. Units after Serial Number Break (VC4GD 481835394 & 541077965, VC6GD 481835429) Propane Gas 50,000 BTU input at 10.0 in. W.C. Gas Line Pressures Natural - Recommend (in. W.C.) 7.0, Min 5.0 Natural - Recommend (in W.C.) 8.0, Min 6.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT. 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. Fig.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS CONTROL PANEL COMPONENTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Removable Components Procedure 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 Fig. 5 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 7 Fig. 8 COMPONENT PANEL COMPONENTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Removable Components Procedure 1. Remove the Right Side Panel. NOTE: If right side panel is not accessible, this component can be serviced by removing the Control Panel. 2. Disconnect the wire leads to the component being replaced. 3. Remove the component. 4.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 10 Fig. 9 TEMPERATURE PROBE (VC4GD/ 6GD) Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Remove the Right Side Panel. NOTE: If right side panel is not accessible, this component can be serviced by removing the Control Panel. F24682 Rev. C (0315) 2. Disconnect the probe leads from the solid state temperature control. 3. Remove the racks and right rack support. 4.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 11 5. Remove probe by pushing it through the oven wall and into the control panel area. Fig. 13 3. Fig. 12 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. 6. Reverse the procedure to install the replacement probe. 7.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 6. Reverse procedure to install the replacement burner. NOTE: Ensure that burner positioning bracket (U shaped end) is inserted into slot at the rear of the burner chamber. NOTE: When installing current production burner covers: • Lay cover flat over burner with openings aligned behind ignitor. • Push burner into unit and flip cover 90° up and align mounting holes. Fig. 19 4.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS FIRST GENERATION UNIT SHOWN (Before April 2005) CURRENT PRODUCTION SHOWN (After February 2015) 4. Loosen the bolts securing the valve and bracket assembly then remove the screws securing the valve to the bracket. SECOND GENERATION UNIT SHOWN (After April 2005 thru February 2015) FIRST GENERATION UNIT SHOWN (Before April 2005) Page 13 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 6. Verify gas pressure as outlined under GAS PRESSURE ADJUSTMENT (for units before February 2015) and GAS VALVE PRESSURE CHECK (for units after February 2015) and check for proper operation. IGNITION CONTROL MODULE Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT. SECOND GENERATION UNIT SHOWN (After April 2005 thru February 2015) 1.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS NOTE: Check to ensure the spark gap distance is approximately 1/8". If the gap appears to be excessive or poor sparking is occurring then adjust. PREVOUS PRODUCTION SHOWN Fig. 27 4. Remove the ignition module board from the mounting bracket. 5. Reverse the procedure to install the replacement ignition module board.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 33 Fig. 31 3. 6. Remove screws securing baffle panel and remove the panel. Fig. 34 Fig. 32 4. B. 5. 7. Blower Only - Loosen set screws on blower hub and using a bearing puller, remove blower from motor shaft. Place a piece of cardboard on the bottom of the oven cavity to protect its surface from any damage during motor assembly removal. 8.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 12. Reconnect lead wires at the motor, replace conduit and junction box cover. OVEN DOORS (SIMULTANEOUS DOORS) NOTE: Check data plate on motor for wiring schematic. The motor must rotate clockwise when viewed from the shaft end. Disconnect the electrical power to the machine and follow lockout / tagout procedures. Assembly Removal 1. Remove the Top Front Cover and Bottom Front Cover. 2. Remove the door switch lever. Fig.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - 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. 5. OVEN DOORS AND BEARINGS (INDEPENDENT DOORS) 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.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 4. Adjust the ball catch as outlined under DOOR CATCH BALL ADJUSTMENT (INDEPENDENT DOORS). ROLLER LATCH ASSEMBLY (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. Fig. 42 C. 8. Disconnect the electrical power to the machine and follow lockout / tagout procedures.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS Fig. 45 2. Independent doors: A. Remove the door handle then remove the outer door panel. B. Lift out the inner door panel and window assembly. NOTE: Left door only - remove door seal from the inside edge of the door. 3. Simultaneous doors: 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.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS HIGH LIMIT THERMOSTAT Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Take out racks from the oven. 2. Remove the high limit thermostat cover/mounting plate from inside the oven cavity at the top. Fig. 47 4. Reverse procedure to install the replacement switch and check for proper adjustment as outlined under DOOR SWITCH ADJUSTMENT.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS INTERIOR LIGHTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. 3. Depress the retaining tabs and pull the socket out from the oven, far enough to disconnect the lead wires. 4. Remove the socket from the oven. 5. Attach the lead wires to the replacement socket. 6. Insert the socket into the hole in the oven and push until the socket is held in place by the retaining tabs. Lamp 1.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS NOTE: The fan must be installed so air is pulled from the rear of the oven and blown into the control area. The arrow on the fan body indicates “air flow” direction and should be pointing toward the controls. NOTE: Ensure fan is seated “squarely” against the air tube and the oven bottom. NOTE: The air deflector should be angled upwards at approximately 30 degrees to properly direct the air flow. Page 23 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE 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 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. SOLID STATE TEMPERATURE CONTROL CALIBRATION (VC4GD/ 6GD) 7.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS a) C. 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. 8. Calculate the average temperature by adding the temperature indicated when the lamp goes out to the temperature indicated when the lamp comes on and dividing this answer by 2. [Temp. (lamp off) + Temp. (lamp on)] ÷ 2 = Average Temp.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 6. Calculate the differential by subtracting the temperature indicated when heat lamp goes out from temperature indicated when heat lamp comes on. Differential = Heat lamp OFF - Heat lamp ON Example: 360° (lamp off) - 340° (lamp on) 20° A. The differential calculated should be less than 30°F. 1) If the differential is less than 30°F, the thermostat is functioning properly. a.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS NOTE: If oven is equipped with "Cook and Hold" option, set to Cook (normal cooking) before continuing. 3. Set the temperature control to the maximum setting. 4. Check machine data plate for correct voltage to oven. Refer to diagram below for proper terminal locations and voltages before checking the control. Use the correct terminals for the corresponding voltage. 5. Turn the power switch to ON. 8.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS type. As temperature increases the resistance value decreases. 1. Remove the Right Side Panel. NOTE: If right side panel is not accessible, this component can be serviced by removing the Control Panel. 2. Place a shielded thermocouple in the geometric center of the oven cavity and determine the temperature in the oven cavity. 3. Remove the probe lead wires from the solid state temperature control. 4.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 8. Turn the set screw to obtain the proper gas pressure (clockwise = pressure increase; counterclockwise = pressure decrease). NOTE: Accurate gas pressure adjustments can only be made with the gas on and the burner lit. PRESSURE READING (IN W.C.) GAS TYPE MANIFOLD Natural 3.5 7.0 5 14 Propane 10 11.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 4. Install hose barb adapter and attach manometer tube. 5. Turn gas supply to the oven back on. 6. Plug the unit in and turn the power switch ON. 7. Set the temperature control to its highest setting and allow burner to ignite. NOTE: The burner must be lit during test. NOTE: Accurate gas pressure readings can only be made with the gas on and the burner lit. PRESSURE READING (IN W.C.) GAS TYPE MANIFOLD Natural 5.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 3. DOOR SWITCH ADJUSTMENT Disconnect the electrical power to the machine and follow lockout / tagout procedures. 1. Remove the Top Front Cover. 2. Door operation: 3. A. Independent doors - The switch actuator should be operated by the switch lever when the right door is between 1" and 1 ½" from being closed. B.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 4. Move the door until proper alignment is achieved then tighten the screws on the upper door bearing hardware. 5. Repeat step 3 and 4 on the opposite door, if necessary. 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.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 4. Each oven door should open with a force of 8 to 25 pounds when pulled at the handle. The adjustments must allow the doors to remain closed during normal operation and allow opening without exertion by the user. 4. Apply lubricant at the top of the door catch assembly to lubricate the internal spring. See LUBRICATION.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 1) Turn set screw inside the catch assembly housing clockwise to increase tension on catch ball and counterclockwise to decrease tension on catch ball. 3. E. When the doors are opened, the turnbuckles will move away from each other. F. The stop cable must be positioned where it moves freely and does not get pinched. Position door chain assembly to factory setting if the conditions in step 2 are not met. Fig.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS COMPUTER CONTROL (VC4GC/ VC6GC) Operation Refer to the Instructions Manual for specific operating instructions. Setup Mode NOTE: Use the setup mode to verify that the control is configured to the factory settings which result in the proper operation of the oven. If the CAL1 parameter is other than zero, determine if it is still needed before resetting to zero. See COMPUTER CONTROL CALIBRATION (VC4GC/VC6GC).
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 2. Press the set key then temperature key to enter the temperature set mode. A. The display will alternate between the term "StPt" (set point) and the current oven temperature setting. B. Press the up or down arrow keys to make the proper selection. C. Press the set key again to save the change and exit the temperature set mode. 3. Allow the oven temperature to stabilize (normally 3 cycles). 4.
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VC4G & VC6G SERIES FULL SIZE 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 Hi/ Low (S3) . . . . . . . . . . . . . Controls blower motor speed between Hi and Low settings. Available on standard models VC4GS/6GS or VC4GD/6GD.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION SSR1 & SSR2 (VC4GC/ 6GC) . . . . . . . . . . . . . . . . . When SSR1 is energized by computer control, connects power to blower motor for Hi fan speed operation in normal ROAST mode. In ROAST & HOLD Mode only, SSR1 is deenergized and SSR2 is energized by computer control and connects power to blower motor for Low fan speed operation. Ignition Control Module . . . . . . . . . . . . . . .
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION VC4GS/6GS - Plug, Socket and Components (Standard Controls) Page 39 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION VC4GD/6GD - Plug, Socket and Components (Standard Controls) F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION VC4GS/6GS, VC4GD/6GD - Plug, Socket and Components (Roast & Hold Option) Page 41 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION VC4GC/6GC - Plug, Socket and Components (Roast & Hold Standard) F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION SEQUENCE OF OPERATION VC4GS, VC6GS With Roast & Hold Option (Mechanical KX Thermostat) Schematic diagram 5304 will be used to explain the electrical sequence of operation for both the Normal ROAST cycle (normal cooking) and the ROAST & HOLD cycle. Normal Roast Cycle 1. Conditions. A. L1 (HOT) to power switch (S1).
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION a) b. Power is connected through the function switch (S3) contacts and the convection fan motor is energized (fan speed Hi). When the convection fan motor reaches operating speed, the centrifugal switch on the motor closes. The heat relay (R3) is then energized, R3 relay contacts normally open (N.O.) close and the heating circuit is powered. a) Ignition control module is energized.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION H. Control thermostat in the OFF position (OPEN). I. High limit switch CLOSED. J. Roast timer (normal cooking) in the OFF position.. K. Roast and Hold timer in the OFF position. L. Oven doors Closed. 1) M. 2. 2) a. Door switch contacts CLOSED. 3) Oven cavity temperature below 140°F. Set controlling thermostat to desired ROAST then Hold temperature (Roast & Hold cooking). 3. Internal contacts close.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION If a flame is not "sensed" after 7 seconds of sparking, the "no ignition" light comes back on, 2nd valve (main) on the gas valve is de-energize and gas flow to the burner stops. Ignition trial cycle repeats after a 15 second purge between cycles for two additional tries before locking out. To reset after a lockout, turn power switch (S1) OFF then ON. 4. A. 3. Contacts 1 & 3 close, timer motor is energized and timing "down" begins.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION a. Heat relay (R3) contacts (N.O.) close and the heating circuit is powered. a) Ignition control module is energized. b) No ignition light (red) comes ON, module performs a self diagnostic test for 4 seconds, 2nd valve (main) on the gas valve is energized. Gas starts to flow to the burner, sparking begins, the "no ignition" light goes out and burner lights. Sparking continues for up to 7 seconds or until a flame is established.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION 3. Power switch (S1) turned ON. 3) A. Component cooling fan energized. B. Power ON light (Amber) comes ON. C. Power to one side of the following components: Normal ROAST timer terminal 1, ROAST & HOLD timer terminal 1, transformer primary (T1). a. NOTE: Power is available to the oven light switch (wire #20) to turn the oven cavity lights ON when the light switch is turned ON; and power is available to the normally open N.O.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION 1) Heat light goes out. B. Oven properly grounded. 2) Power removed from heat relay (R3). C. Gas supply valve ON. a. D. Gas combination control valve ON. E. Power switch (S1) OFF. F. Function switch (S3) set to ROAST & HOLD cycle. G. Oven light switch (S2) ON/OFF (position has no affect on the function of the ROAST & HOLD cycle). H. Temperature control dial set to lowest temperature (fully counterclockwise).
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION NOTE: Gas does not flow to the burner until the 2nd valve (main) is energized. 2) d) With door switch closed, power is applied to motor speed (Hi/Low) relay (R1) normally open (N.O.) contacts and hold relay (R2) common (C). a. Motor speed relay (R1) is energized through hold relay (R2) normally closed contacts (N.C.). Relay contacts (R1) change state and the normally open (N.O.) set of contacts close.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION occurs: ROAST & HOLD timer is turned OFF; function switch (S3) is turned back to Normal ROAST (normal cooking) or Power switch (S1) is turned to the OFF or COOL DOWN position.. 1. With the power switch turned ON, power is supplied to timer. 2. Set ROAST & HOLD timer to desired time (Roast & Hold cooking). 4. 3. A. Heat light comes ON. B. Motor speed relay (R1) is energized, (R1) contacts change state and the normally open (N.O.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION B. Power removed from heat relay (R3) and the contacts open (N.O.). 1) Ignition control module de-energized. a. C. 6. Power removed from 2nd valve (main) on the gas valve and gas flow to the burner stops. Power is also removed from motor speed relay (R1). 1) a. Convection fan motor de-energized and fan stops rotating.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION VC4GC, VC6GC (Roast & Hold Standard on Computer Model) Schematic diagram 10437 will be used to explain the electrical sequence of operation for both the ROAST cycle (normal cooking) and the ROAST & HOLD cycle. Roast Cycle (Normal Cooking) 1. B. D. Component cooling fan energized. E. Transformer (T1) is energized. Oven connected to correct voltage. 1) L1 (HOT) to power switch (S1).
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION 3) With the 120VAC output from the control activated and the centrifugal switch on the convection fan motor closed, power is applied to the heat relay coil (R1). a. Heat relay coil (R1) is energized, (R1) contacts (N.O.) close and the heating circuit is powered. b. Oven "Heat Light" on the control comes ON. c. Ignition control module is energized.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION 5. After the oven temperature drops below 150°F, the heat comes back ON and cycles as needed, to maintain the "Hold" temperature of 150°F. A. 6. Convection fan motor energized. The oven continues to cycle in this manner until one of the following occurs: A. The ROAST & HOLD mode is turned OFF. B. Power switch (S1) is turned to the OFF or COOL DOWN position. Cool Down Cycle (Computer Control Model) 1. Conditions. A. Oven is ON.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SCHEMATICS SCHEMATICS VC4GS, VC6GS Mechanical (KX) Controls F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SCHEMATICS VC4GS, VC6GS Mechanical (KX) Controls, Roast & Hold Option Page 57 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SCHEMATICS VC4GD, VC6GD Solid State Temperature Control F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SCHEMATICS VC4GD, VC6GD Solid State Temperature Control, Roast & Hold Option Page 59 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SCHEMATICS VC4GC, VC6GC Computer Control (Roast & Hold Standard) F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS WIRING DIAGRAMS VC4GS, VC6GS Mechanical (KX) Controls Fig. 82 Page 61 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS Fig. 83 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS VC4GS, VC6GS Mechanical (KX) Controls, Roast & Hold Option Fig. 84 Page 63 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS Fig. 85 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS VC4GD, VC6GD Solid State Temperature Control Fig. 86 Page 65 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS Fig. 87 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS VC4GD, VC6GD Solid State Temperature Control, Roast & Hold Option Fig. 88 Page 67 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS Fig. 89 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS VC4GC, VC6GC Computer Control (Roast & Hold Standard) Fig. 90 Page 69 of 74 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - WIRING DIAGRAMS Fig. 91 F24682 Rev.
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VC4G & VC6G SERIES FULL SIZE 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 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. ALL MODELS SYMPTOMS POSSIBLE CAUSES 1. 2.
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - TROUBLESHOOTING SYMPTOMS POSSIBLE CAUSES Excessive or low heat. 1. Temperature probe malfunction on models HGC5/5X. (Thermostat malfunction on models DGC5) 2. Temperature control board malfunction. 3. Gas pressure Insufficient. 4. Gas orifice plugged or obstructed. 1. Interconnecting wiring malfunction. Mechanical Timer inoperative or not functioning properly. 2. Cook mode OK, no Hold mode. (Cook & Hold models only).
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES 1. Probe malfunction. 2. Control range high (rH1) setting to low. SETUP MODE under COMPUTER CONTROL (VC4GD, VC6GD). 3. Control malfunction. Oven not hot enough. 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).
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VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - TROUBLESHOOTING CODE & PROBLEM Er11 - Open sensor error Er12 - Shorted sensor F24682 Rev. C (0315) PROBABLE CAUSE Open sensor SOLUTION • Check the InP1 setup parameter. Verify it matches your sensor. • Check sensor and connections for a reversed or open sensor. If the condition causing the error is resolved, the error will clear. • Check the InP1 setup parameter. Verify it matches your sensor.