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. 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.
A product of Vulcan-Hart
3600 North Point Blvd Baltimore, MD 21222
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
GENERAL
INTRODUCTION
FEATURES
TEMPERATURE
CONTROL
MODEL
CAVITY DEPTH
DOORS (50/50)
COOK TIMER
VC3ED
26.5"
Solid State
Independent
1-Hour Dial
NOTE: Stainless steel doors with window (standard)
•
HUSKEY™ TF-1000 grease or equivalent high
temperature non-stick grease.
INSTALLATION
Refer to OPERATORS MANUAL for procedures
related to Installation, Operation and Cleaning.
TOOLS
Standard
OPERATION
•
Standard set of hand tools
•
VOM with ability to measure micro amp current.
VOM with minimum of NFPA-70E CAT III 600V,
UL/CSA/TUV listed. Sensitivity of at least 20,000
ohms per volt. Meter leads must also be rated at
CAT III 600V.
Refer to OPERATORS MANUAL for procedures
related to Installation, Operation and Cleaning.
CLEANING
Refer to OPERATORS MANUAL for procedures
related to Installation, Operation and Cleaning.
•
•
•
•
Gear Puller to remove blower
Temperature tester (thermocouple type)
Manometer
LUBRICATION
RTV sealant, 736 DOW silicone high temp (P/N
542133) or equivalent
•
Cavity blower motor has sealed bearings and
requires no additional lubrication.
SPECIFICATIONS
AMPERAGE - 3 PHASE/ 60HZ
RECOMMENDED CIRCUIT
TOTAL
POWER
(KW)
PER LINE
PROTECTION
MODEL
208V
240V
480V
208V
45
240V
480V
20
VC3ED
12.5
35
33
15
40
1
2
Amperage values in the table are nominal. Tolerance is +5/-10%.
Complied in accordance with National Electric Code, ANSI/NFPA 70, latest edition
NOTES:
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
AMPERAGE - 1 PHASE/ 60HZ
RECOMMENDED CIRCUIT
TOTAL
POWER
(KW)
PER LINE
PROTECTION
MODEL
208V
240V
480V
208V
240V
480V
VC3ED
12.5
60
52
26
80
70
35
1
2
Amperage values in the table are nominal. Tolerance is +5/-10%.
Complied in accordance with National Electric Code, ANSI/NFPA 70, latest edition.
NOTES:
SPECIFICATION SHEET
F45534 (0415)
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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. Disconnect temperature probe leads from solid
state temperature control.
3. Disconnect fuse wires.
4. Unplug wire harness connector to control panel
components.
Fig. 2
5. Reverse procedure to install.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Control Panel
1. Remove three (3) screws on the right side which
secure the control panel then left up and pull
away.
Right Side - Front Panel
1. Loosen two screws near front of oven, which
secure bottom front cover.
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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.
Disconnect the
Left Side Panel
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove screws along right side, middle left side,
and bottom on left side panel.
2. Loosen screws on top and bottom on left side of
panel.
Right Side - Rear Panel
1. Remove two middle screws along right side of
rear panel.
3. Loosen two screws near front of oven, which
secure bottom front cover.
2. Remove screws along left side of rear panel.
3. Remove bottom screws on rear panel.
4. Loosen top and bottom screw along right side of
rear panel.
F45534 (0415)
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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
2. Remove the component being replaced.
3. Reverse the procedure to install the replacement
component, then check oven for proper
operation.
Fig. 6
COMPONENT PANEL
4. Lift up and pull away to remove.
COMPONENTS
5. Reverse procedure to install.
Disconnect the
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
follow lockout / tagout procedures.
electrical power to the machine and
Fan Cover
Removable Components
1. Remove racks.
2. Lift fan cover up and out of oven.
NOTE: If right side panel is not accessible, this
component can be serviced by removing the
2. Disconnect the wire leads to the component
being replaced.
3. Remove the component.
4. Reverse the procedure to install the replacement
component and check oven for proper operation.
TEMPERATURE PROBE
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Fan Cover Removal
3. Reverse procedure to install.
NOTE: If right side - front panel is not accessible, this
component can be serviced by removing the
Disconnect the probe leads from the solid state
temperature control.
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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 cut-
away.
Fig. 11
6. Reverse the procedure to install the replacement
probe.
7. Adjust the temperature control as outlined under
Adjustments.
HEATING ELEMENTS
Fig. 9
Disconnect the
3. Remove the racks from inside cavity.
electrical power to the machine and
follow lockout / tagout procedures.
4. Remove the probe guard.
2. Disconnect element wire connectors.
F45534 (0415)
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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.
3. If replacing:
A. Blower Only - Loosen bolts on blower hub
and using a bearing puller, remove blower
from motor shaft.
1) Reverse procedure to install and adjust
blower position as outlined under
Service Procedures and Adjustments.
Fig. 12
3. Remove racks from cavity.
B. Motor - perform step 3A and continue
procedure.
Loosen element screws on side wall.
4. Remove bolts that secure the motor mounting
plate to the rear wall.
5. Remove screws on back wall holding brackets.
6. Pull elements forward, then away from right wall.
Heating Element
7. Reverse the procedure to install the replacement
heating element.
Fig. 14
5. Place a piece of cardboard on the bottom of the
oven cavity to protect its surface from any
damage during motor assembly removal.
6. Pull the motor assembly into the oven cavity and
place it on the cardboard.
7. Remove the junction box cover from the motor,
disconnect lead wires and remove the conduit.
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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.
14. Replace the baffle panel.
15. Remove cardboard from the bottom of the oven
cavity.
9. Position the replacement motor on the motor
mounting plate and install mounting bolts and
washers. Hand tighten mounting bolts only.
16. Check oven for proper operation then replace
rack guides and racks.
DOOR SWITCH
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
2. Unscrew nut holding door switch.
3. Pull door switch and washer out through bottom
panel opening.
Fig. 15
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.
Fig. 16
11. Slide blower onto motor shaft until hub is flush
with end of shaft then tighten bolts.
12. Adjust motor position until blower is parallel to
motor mounting plate as outlined under
Procedures and Adjustments.
Fig. 17
4. Disconnect the lead wires to the door switch.
13. Position motor mounting plate on the rear wall
and secure with screws and washers.
5. Reverse procedure to install the replacement
switch.
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS
3. Reverse the procedure to install the replacement
ROLLER LATCH ASSEMBLY
door and check oven for proper operation.
(INDEPENDENT DOORS)
HIGH LIMIT THERMOSTAT
Disconnect the
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove the screws that attach roller latch
assembly to door.
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. 18
2. Reverse procedure to install.
DOOR REMOVAL
1. Open door to a 90° angle.
2. Lift door up off hinges to remove.
Fig. 20
3. Disconnect lead wires from high limit thermostat.
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.
Fig. 19
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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. Reverse procedure to install new lamp assembly.
COOLING FAN
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
NOTE: If right side - front panel is not accessible, this
component can be serviced by removing the
Fig. 21
3. Reverse procedure to install new bulb.
Lamp Assembly Replacement
1. Remove racks in cavity.
2. Remove wire nuts from fan wire connections.
2. Pull lamp cover off.
Insert screw driver and push lamp assembly out
into cavity.
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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. The arrow on the fan body indicates "air flow"
direction and should be pointing toward the controls.
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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.
Fig. 24
NOTE: If right side panel is not accessible, this
component can be serviced by removing CONTROL
6. Check for proper voltage across terminals COM
AC to 120VAC or COM AC to 208-240VAC for
power to the control.
2. Place a thermocouple in the geometric center of
the oven cavity.
A. If correct, proceed to step 7.
NOTE: Oven temperature must be below 450°F.
B. If incorrect, problem is not with the
temperature control. See
NOTE: If oven is equipped with "Cook and Hold"
option, set to Cook (normal cooking) before
continuing.
7. Check relay voltages on the board:
3. Set the temperature control to the maximum
setting.
A. For 120VAC controls - check across
OUTPUT RELAY terminal (left side) to 120
VAC terminal for input to the internal relay.
Check across OUTPUT RELAY terminal
(right side) to 120 VAC for output from the
internal relay.
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.
B. For 208-240VAC controls - check across
OUTPUT RELAY terminal (left side) to
208-240 VAC terminal for input to the
internal relay. Check across OUTPUT
RELAY terminal (right side) to 208-240 VAC
for output from the internal relay.
5. Turn the power switch to ON.
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
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
2) 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
NOTE: If right side panel is not accessible, this
component can be serviced by removing CONTROL
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.
8. Set the temperature control to the minimum
setting.
4. Test the probe with an multimeter.
NOTE: Oven temperature must be above 300°F.
A. If the measured resistance values are inside
the given tolerance then the probe is
functioning properly.
9. Check for zero (0) volts AC across terminals
OUTPUT RELAY terminal (right side) to 120 VAC
or OUTPUT RELAY terminal (right side) to
208-240 VAC for no output from the internal
relay.
B. If the measured resistance values are
outside the given tolerance then replace the
probe and retest.
A. If correct, temperature control is functioning
properly.
1) Check oven for proper operation.
5. Reverse procedure to install.
B. If incorrect, check temperature probe as
outlined under TEMPERATURE PROBE
TEMP (°F)
77
90,000
4,077
3,016
2,266
1,726
1,332
1,041
360
380
400
425
450
475
822
656
529
424
334
266
1) If temperature probe is OK:
a. Turn the power switch OFF.
240
260
280
Disconnect the
300
electrical power to the machine and
follow lockout / tagout procedures.
320
340
b. Replace the temperature control
and check calibration as outlined
under SOLID STATE
* Resistance in ohms ± 10%
SOLID STATE TEMPERATURE
CONTROL CALIBRATION
TEMPERATURE PROBE TEST
(SOLID STATE CONTROL)
Calibration Steps
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Set the ON / OFF / OVEN COOL switch to ON.
3. Set the temperature controller dial to 350°F.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
4. Allow the oven temperature to stabilize
(minimum three heating cycles).
NOTE: The temperature probe used in conjunction
with the Solid State Temperature control is an RTD
(resistance temperature detector) of the Thermistor
type. As temperature increases the resistance value
decreases.
5. Record the temperature at which the Heat lamp
comes ON (heating starts) and goes OFF
(heating stops). This is the control differential.
Heat lamp OFF temp - Heat lamp ON temp =
Control Differential.
6. The nominal control differential should be less
than 20°F.
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
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. Install a new temperature
controller and run calibration steps again.
7. Calculate the average oven temperature by
adding the actual minimum temperature to the
actual maximum temperature and dividing by 2.
EXAMPLE:
Oven set to 350°F.
Fig. 25
Actual minimum oven temperature = 335°F
9. Monitor the internal oven temperature and
Control turns on at 334°F
determine at what temperature the control should
turn on to give you the required minimum
temperature (Example: 350-341=9; 334+9=341.
341°F is the temperature at which you would wish
the controller to turn on).
Actual maximum oven temperature = 347°F
Control turns off at 340°F
335 + 347 = 682
10. After allowing the oven to operate through
several cycles (minimum 3 cycles), monitor the
temperature as it falls to the desired turn on point.
Using a small screw driver, adjust the calibration
adjustment until the controller turns on at the
desired turn on temperature.
682/ 2 = 341 (the control is 9°F out of calibration)
340 - 334 = 6°F Control Differential
347 - 335 = 12°F Oven Temperature Differential.
A. If the average oven temperature is within +/-
5°F from the dial setting, no calibration is
necessary.
11. The calibration control is adjusted clockwise in
order to increase the set temperature and
counter clockwise to decrease the set
temperature.
B. If the average oven temperature is not within
+/- 5°F, calibration is recommended.
8. Loosen the set screw on the temperature
controller and carefully remove the knob from the
shaft, without rotating the shaft. This will expose
the calibration adjustment control access hole in
the front panel.
12. The controller has only +/- 25°F of adjustment.
1/4 turn of the calibration adjustment represents
approximately 20°F shift in calibration.
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
HEATING ELEMENT VALUES
HEATING ELEMENT TEST
AMPS PER
ELEMENT
KW PER
OHMS PER
ELEMENT
VOLT.
ELEMENT
Certain procedures in
1 PH
3 PH
19
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.
208
240
480
4
4
4
19
16.5
8
10
14.5
57
16.5
8
1. Values in the table are nominal.
Tolerance is +5/-10%.
NOTES: 2. Voltage values are @ 60HZ.
3. Resistance values (ohms) are @
room temperature.
1. Turn the power switch ON and set the oven
temperature control to the highest setting.
BLOWER ADJUSTMENT
2. Measure the voltage at the heating element
terminals and verify it against the data plate
voltage.
Disconnect the
A. If voltage is incorrect, find the source of the
problem.
electrical power to the machine and
follow lockout / tagout procedures.
B. If voltage is correct, check current draw
(amps) through the heating element lead
wires.
1. Remove the blower motor and mounting
assembly by following steps 1 through 7 as
outlined under BLOWER AND MOTOR under
Removal and Replacement of Parts.
NOTE: This method is preferred over a resistance
check when a clamp on type amp meter is available.
1) If current draw is correct then heating
element is functioning properly. See
Heating Element Values table.
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.
2) If current draw is not correct, turn the
power switch OFF and disconnect the
electrical supply to the oven.
a. Replace heating element, then
proceed to step 3.
A. If the blower is square then tighten motor
mounting bolts and proceed to step 4.
C. If unable to check current draw, a resistance
check may indicate a malfunctioning
element.
B. If the blower is not square continue
adjusting until proper spacing is achieved
then tighten motor mounting bolts.
1) Turn the power switch OFF and
disconnect the electrical supply to the
oven.
NOTE: If necessary, place shims between motor and
frame.
2) Remove the lead wires from the
heating element and check resistance
(ohms). See Heating Elements
3. Check for proper operation.
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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. Replace roller latch if malfunctioning as
outlined under ROLLER LATCH
and adjust as outlined in this procedure.
3. 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.
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.
F45534 (0415)
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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
Controls the oven cavity lights.
(S3) . . . . . . . . . . . . . . . . . . .
Fan Speed Switch
Controls blower motor speed between High and Low settings.
(S2) . . . . . . . . . . . . . . . . . . .
Alarm/Buzzer . . . . . . . . . Signals the end of a "Cook" cycle when cooking time expires.
Cook Timer . . . . . . . . . . . Counts the "Cook" time of the product and signals the buzzer at the end of the cycle.
Door Switch . . . . . . . . . . Allows the oven to operate when the doors are closed but stops the oven from operating
when the doors are opened.
Blower Motor . . . . . . . . . Operates the oven cavity blower (convection fan).
Transformer . . . . . . . . . . Provides 240VAC power to the oven control circuit and blower motor (480VAC models
only).
Solid State
Temperature
Monitors temperature sensor and regulates the oven cavity temperature by controlling
1CON to energize the heating elements when the control calls for heat.
Control . . . . . . . . . . . . . . .
High Limit
Protects the oven from temperatures above 550°F by removing power from the heating
Thermostat . . . . . . . . . . . circuit. Auto resets at 500°F.
1C . . . . . . . . . . . . . . . . . . . . Provides power to heating elements when energized. 1C is energized by the temperature
control when a call for heat is made.
Power ON Light . . . . . . . Lit whenever the power switch (S1) is turned to ON or Cool Down mode.
Heat Light . . . . . . . . . . . . Lit whenever temperature control is calling for heat.
Temperature Probe . . . Senses the oven temperature for the solid state temperature control or 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.
Cooling Fan . . . . . . . . . . Circulates cooler air from outside the oven to cool components in the control area.
Fuses . . . . . . . . . . . . . . . . . Protect control circuit.
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
Fig. 30
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
Fig. 31
E. Oven doors closed (door switch contacts
SEQUENCE OF OPERATION
CLOSED).
F. Oven cavity temperature below 140°F.
2. Power switch (S1) turned ON.
A. Power ON light (Amber) comes ON.
B. Solid state temperature control energized.
Cook Cycle
1. Conditions.
A. Oven connected to correct voltage and is
properly grounded.
B. Power switch (S1) OFF.
1) Heating elements powered and
heating starts.
C. Temperature dial set to lowest temperature
(fully CCW).
2) 1C coil energized.
D. High limit thermostat CLOSED.
3) Heat light (Clear) comes on.
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
C. Blower motor energized.
B. Contacts 1 & 4 close.
NOTE: Motor speed (Hi/Low) depends on position of
1) Buzzer energized and sounds.
fan speed switch (S2).
NOTE: The buzzer continues to sound until the timer
D. Component cooling fan energized.
dial is set to the OFF position or additional time is set.
E. Power to oven cavity light switch (S3) wire
#1. Turns cavity lights ON/OFF; does not
affect "Cook" cycle.
Cool Down Cycle
1. Conditions.
A. Oven is ON.
3. Set temperature dial to desired "Cook"
temperature.
B. Oven cavity temperature needs to be
lowered.
4. Oven reaches set temperature.
C. Doors are open (door switch contacts
OPEN).
A. Temperature control de-energizes internal
relay and the normally open (N.O.) contacts
OPEN.
D. Fan speed switch (S2) set to "Hi".
2. Power Switch (S1) turned to COOL DOWN.
A. Power ON light (Amber) goes out.
B. Convection fan motor energized.
1) Heat light goes out.
2) 1C coil de-energized.
a. Power removed from heating
elements and heating stops.
3. If doors are CLOSED (door switch contacts
CLOSED):
5. The oven will continue to cycle on the
temperature control until the doors are opened or
power switch (S1) is turned to the OFF or COOL
down position.
A. Power ON light (Amber) comes ON.
B. Component cooling fan energized.
C. Power is supplied to:
Timer Cycle, Cooking
NOTE: The "Cook" timer operates independently of
the heating cycle. Additional time can be set or the
timer can be turned OFF throughout the cooking cycle.
1) "Cook" timer terminal 1. If a time is
dialed, timer will operate and buzzer
will sound when timer reaches zero.
1. With the power switch turned ON, power is
supplied to "Cook" timer terminal 1.
2) Oven cavity light switch (S3) wire #1.
Turns cavity lights ON/OFF; does not
affect Cool down cycle.
2. Set "Cook" timer to desired time.
4. The oven will remain in this condition until the
power switch (S1).
A. Contacts 1 & 3 close, timer motor is
energized and timing "down" begins.
3. Time expires on "Cook" timer.
A. Contacts 1 & 3 open, timer motor is de-
energized and timing stops.
Page 23 of 31
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
VC3ED 208-240V WIRE DIAGRAM TABLE
ITEM
A
DESCRIPTION
SWITCH, TOGGLE S.P.S.T
FAN SWITCH, TOGGLE D.P.D.T
LIGHT, 250V, CLEAR
B
C
C1
D
LIGHT, 250V, CLEAR
WIRE SET, LIMIT SWITCH
TEMP. CONTROL - NCC
E
F
TIMER, 230 VOLT (1-HR, 60 HZ.) (5-HR, 60 HZ.)
BUZZER 230 VOLT
G
H
DOOR SWITCH, 2HP
J
BLOCK,PORCELIAN ASSEMBLY
LIMIT CONTROL 550F
K
L
ELEMENT ASSY, 12.5 KW (240 VOLT) (208 VOLT)
PROBE,THERMISTOR
P
R
FUSE & HOLDER 15A
S
TERMINAL BLOCK 3 POLE
CONTACTOR 40A 3 POLE
MOTOR 1/2 HP. 2 SPEED G.E.
SWITCH, TOGGLE D.P.D.T. (CO)
OVEN LAMP, 40W, 230V
T
V
X
Y
AB
WIRE NUT BLUE
Page 25 of 31
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
VC3ED 208-240V SCHEMATIC
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
VC3ED 480V Wire Diagram
VC3ED 480V WIRE DIAGRAM TABLE
ITEM
A
DESCRIPTION
SWITCH, TOGGLE S.P.S.T
FAN SWITCH, TOGGLE D.P.D.T
LIGHT, 250V, CLEAR
B
C
C1
LIGHT, 250V, CLEAR
Page 27 of 31
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
VC3ED 480V WIRE DIAGRAM TABLE
ITEM
E
DESCRIPTION
TEMP. CONTROL - NCC
F
TIMER, 230 VOLT (1-HR, 60 HZ.) (5-HR, 60 HZ.)
BUZZER 230 VOLT
G
H
DOOR SWITCH, 2HP
J
BLOCK,PORCELIAN ASSEMBLY
LIMIT CONTROL 550F
K
L
LCOE ELEMENT ASSY, 12.5 KW (208 VOLT) (240 VOLT)
PROBE,THERMISTOR
P
R
FUSE & HOLDER 15A
S
TERMINAL BLOCK 3 POLE
CONTACTOR 40A 3 POLE
MOTOR 1/2 HP. 2 SPEED G.E.
SWITCH, TOGGLE D.P.D.T. (CO)
OVEN LAMP, 40W, 230V
T
V
X
Y
AB
AC
AD
WIRE NUT BLUE
WIRE SET, LIMIT SWITCH
TRANSFORMER, 480 TO 240V
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
VC3ED 480V SCHEMATIC
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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
SYMPTOMS
POSSIBLE CAUSES
1. Line voltage incorrect.
2. Fuse.
3. Power switch (S1) malfunction.
4. Fan speed switch (S2) malfunction.
5. Interconnecting wiring malfunction.
6. Motor inoperative.
Blower motor doesn’t run with power switch in "ON"
"COOL DOWN" or position.
1. Door switch malfunction.
2. Fan speed switch (S2) malfunction.
3. Interconnecting wiring malfunction.
4. Motor inoperative.
Blower motor doesn’t run with power switch "ON", but
oven heats.
1. Power switch (S1) malfunction.
2. Interconnecting wiring malfunction.
1. Temperature probe malfunction.
2. Temperature control not calibrated.
3. Contactor malfunction.
Blower motor doesn’t run in "Cool Down", but runs OK in
"ON" position.
Excessive Heat in oven.
4. Heating element(s) malfunction.
1. Line voltage incorrect.
2. High limit thermostat OPEN.
3. Contactor malfunction.
Low heat in oven.
4. Heating element(s) malfunction.
5. Temperature probe malfunction.
6. Temperature calibration.
1. Interconnecting wiring malfunction.
2. Timer malfunction.
Timer inoperative or not functioning properly.
Component cooling Fan does not run.
1. Interconnecting wiring malfunction.
2. Fan motor inoperable.
F45534 (0415)
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VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - TROUBLESHOOTING
SYMPTOMS
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.
Uneven Cooking.
6. Heating element(s) malfunction.
7. Doors out of adjustment.
8. Door roller out of adjustment or broken.
9. Door seals damaged.
1. Cooling fan malfunction.
Intermittent operation problems.
Oven will not turn on.
2. Wiring connections loose.
3. High ambient temperatures.
1. Line voltage incorrect.
2. Control circuit fuses OPEN.
3. Power switch (S1) inoperative.
4. Transformer inoperative (480V only).
1. High limit thermostat OPEN.
2. Temperature probe malfunction.
3. Heating element malfunction.
4. Contactor malfunction.
No heat, convection fan motor runs.
5. Temperature control malfunction.
1. Power switch (S1) in "Cool Down".
2. Door switch malfunction.
No power to temperature control.
Door does not seal or shut properly
1. Doors out of adjustment.
2. Door catch roller out of adjustment or broken
(independent doors).
3. Door seals damaged.
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