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)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN
TABLE OF CONTENTS
GENERAL .................................................................................................. 3
INTRODUCTION ....................................................................................... 3
INSTALLATION ........................................................................................ 3
OPERATION ........................................................................................... 3
CLEANING ............................................................................................. 3
LUBRICATION ......................................................................................... 3
TOOLS ................................................................................................. 3
SPECIFICATIONS ...................................................................................... 3
REMOVAL AND REPLACEMENT PARTS ................................................................... 5
COVERS AND PANELS ................................................................................ 5
CONTROL PANEL COMPONENTS ..................................................................... 7
COMPONENT PANEL COMPONENTS ................................................................. 7
TEMPERATURE PROBE ............................................................................... 7
HEATING ELEMENTS .................................................................................. 8
BLOWER AND MOTOR ................................................................................ 9
DOOR SWITCH ....................................................................................... 10
ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) ............................................... 11
DOOR REMOVAL ..................................................................................... 11
HIGH LIMIT THERMOSTAT ........................................................................... 11
INTERIOR LIGHTS .................................................................................... 12
COOLING FAN ........................................................................................ 12
SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 14
SOLID STATE TEMPERATURE CONTROL TEST ..................................................... 14
TEMPERATURE PROBE TEST (SOLID STATE CONTROL) ........................................... 15
SOLID STATE TEMPERATURE CONTROL CALIBRATION ............................................ 15
HEATING ELEMENT TEST ............................................................................ 17
BLOWER ADJUSTMENT .............................................................................. 17
DOOR STRIKE ADJUSTMENT INDEPENDENT DOORS) .............................................. 18
ELECTRICAL OPERATION ................................................................................ 19
COMPONENT FUNCTION ............................................................................ 19
COMPONENT LOCATION ............................................................................. 20
SEQUENCE OF OPERATION ......................................................................... 22
SCHEMATICS AND WIRING DIAGRAMS .............................................................. 24
TROUBLESHOOTING ..................................................................................... 30
VC3ED ................................................................................................ 30
© VULCAN 2015
F45534 (0415) Page 2 of 31
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
GENERAL
INTRODUCTION
FEATURES
MODEL CAVITY DEPTH
VC3ED 26.5" Solid State Independent 1-Hour Dial
NOTE: Stainless steel doors with window (standard)
INSTALLATION
TEMPERATURE
CONTROL
• HUSKEY™ TF-1000 grease or equivalent high
DOORS (50/50) COOK TIMER
temperature non-stick grease.
Refer to OPERATORS MANUAL for procedures
related to Installation, Operation and Cleaning.
OPERATION
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.
LUBRICATION
• Cavity blower motor has sealed bearings and
requires no additional lubrication.
Standard
• 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.
• Gear Puller to remove blower
• Temperature tester (thermocouple type)
• Manometer
• RTV sealant, 736 DOW silicone high temp (P/N
542133) or equivalent
TOOLS
SPECIFICATIONS
AMPERAGE - 3 PHASE/ 60HZ
TOTAL
MODEL
VC3ED 12.5 35 33 15 45 40 20
NOTES:
POWER
(KW)
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
208V 240V 480V 208V 240V 480V
PER LINE
1
RECOMMENDED CIRCUIT
PROTECTION
2
Page 3 of 31 F45534 (0415)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
AMPERAGE - 1 PHASE/ 60HZ
RECOMMENDED CIRCUIT
PROTECTION
MODEL
TOTAL
POWER
(KW)
PER LINE
1
208V 240V 480V 208V 240V 480V
VC3ED 12.5 60 52 26 80 70 35
1
NOTES:
Amperage values in the table are nominal. Tolerance is +5/-10%.
2
Complied in accordance with National Electric Code, ANSI/NFPA 70, latest edition.
SPECIFICATION SHEET
2
F45534 (0415) Page 4 of 31
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.
Fig. 2
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Control Panel
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.
5. Reverse procedure to install.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove three (3) screws on the right side which
secure the control panel then left up and pull
away.
Page 5 of 31 F45534 (0415)
Right Side - Front Panel
1. Loosen two screws near front of oven, which
secure bottom front cover.
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. 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.
Right Side - Rear Panel
1. Remove two middle screws along right side of
rear panel.
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.
Fig. 5
5. Slide right side rear panel up and to the right to
remove.
6. Reverse procedure to install.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Left Side Panel
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.
3. Loosen two screws near front of oven, which
secure bottom front cover.
F45534 (0415) Page 6 of 31
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS
Fig. 6
4. Lift up and pull away to remove.
5. Reverse procedure to install.
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.
COMPONENT PANEL
COMPONENTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Fan Cover
1. Remove racks.
2. Lift fan cover up and out of oven.
Fan Cover Removal
3. Reverse procedure to install.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Removable Components
1. Remove the RIGHT SIDE - FRONT 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. 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.
1. Remove the RIGHT SIDE - FRONT PANEL.
NOTE: If right side - front panel is not accessible, this
component can be serviced by removing the
CONTROL PANEL.
Disconnect the probe leads from the solid state
temperature control.
Page 7 of 31 F45534 (0415)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS
Fig. 8
2. Remove upper panel and pull out insulation cutaway.
Fig. 10
5. Remove probe by pushing it through the oven
wall and down through upper panel into the
control panel area.
6. Reverse the procedure to install the replacement
7. Adjust the temperature control as outlined under
Fig. 9
3. Remove the racks from inside cavity.
4. Remove the probe guard.
1. Remove RIGHT SIDE - REAR PANEL.
2. Disconnect element wire connectors.
F45534 (0415) Page 8 of 31
Fig. 11
probe.
SOLID STATE TEMPERATURE CONTROL
CALIBRATION under Service Procedures and
Adjustments.
HEATING ELEMENTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS
Fig. 12
3. Remove racks from cavity.
4. Remove FAN COVER.
Loosen element screws on side wall.
5. Remove screws on back wall holding brackets.
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) Reverse procedure to install and adjust
blower position as outlined under
BLOWER ADJUSTMENT under
Service Procedures and Adjustments.
B. Motor - perform step 3A and continue
procedure.
4. Remove bolts that secure the motor mounting
plate to the rear wall.
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.
Page 9 of 31 F45534 (0415)
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.
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.
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.
DOOR SWITCH
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove the BOTTOM FRONT COVER.
2. Unscrew nut holding door switch.
3. Pull door switch and washer out through bottom
panel opening.
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
BLOWER ADJUSTMENT under Service
Procedures and Adjustments.
13. Position motor mounting plate on the rear wall
and secure with screws and washers.
F45534 (0415) Page 10 of 31
4. Disconnect the lead wires to the door switch.
5. Reverse procedure to install the replacement
Fig. 17
switch.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT PARTS
ROLLER LATCH ASSEMBLY
(INDEPENDENT DOORS)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove the screws that attach roller latch
assembly to door.
3. Reverse the procedure to install the replacement
door and check oven for proper operation.
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. 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
Page 11 of 31 F45534 (0415)
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. 21
3. Reverse procedure to install new bulb.
Lamp Assembly Replacement
1. Remove racks in cavity.
2. Pull lamp cover off.
3. Remove RIGHT SIDE - REAR PANEL.
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.
1. Remove the
NOTE: If right side - front panel is not accessible, this
component can be serviced by removing the
CONTROL PANEL.
2. Remove wire nuts from fan wire connections.
RIGHT SIDE - FRONT PANEL.
Insert screw driver and push lamp assembly out
into cavity.
F45534 (0415) Page 12 of 31
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.
Page 13 of 31 F45534 (0415)
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. Remove the
NOTE: If right side panel is not accessible, this
component can be serviced by removing CONTROL
PANEL.
2. Place a thermocouple in the geometric center of
the oven cavity.
NOTE: Oven temperature must be below 450°F.
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.
RIGHT SIDE - FRONT PANEL.
Fig. 24
6. Check for proper voltage across terminals COM
AC to 120VAC or COM AC to 208-240VAC for
power to the control.
A. If correct, proceed to step 7.
B. If incorrect, problem is not with the
temperature control. See
TROUBLESHOOTING.
7. Check relay voltages on the board:
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.
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.
F45534 (0415) Page 14 of 31
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.
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
PROBE TEST (SOLID STATE
CONTROL).
8. Set the temperature control to the minimum
setting.
NOTE: Oven temperature must be above 300°F.
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.
A. If correct, temperature control is functioning
properly.
B. If incorrect, check temperature probe as
outlined under TEMPERATURE PROBE
TEST (SOLID STATE CONTROL).
1) If temperature probe is OK:
a. Turn the power switch OFF.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
b. Replace the temperature control
and check calibration as outlined
SOLID STATE
under
TEMPERATURE CONTROL
CALIBRATION.
NOTE: If right side panel is not accessible, this
component can be serviced by removing 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. Test the probe with an multimeter.
A. If the measured resistance values are inside
the given tolerance then the probe is
functioning properly.
B. If the measured resistance values are
outside the given tolerance then replace the
probe and retest.
1) Check oven for proper operation.
5. Reverse procedure to install.
TEMP (°F) OHMS * TEMP (°F) OHMS *
77 90,000 360 822
240 4,077 380 656
260 3,016 400 529
280 2,266 425 424
300 1,726 450 334
320 1,332 475 266
340 1,041
* Resistance in ohms ± 10%
SOLID STATE TEMPERATURE
CONTROL CALIBRATION
TEMPERATURE PROBE TEST
(SOLID STATE CONTROL)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
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.
1. Remove the RIGHT SIDE - FRONT PANEL.
Page 15 of 31 F45534 (0415)
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.
4. Allow the oven temperature to stabilize
(minimum three heating cycles).
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.
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.
Actual minimum oven temperature = 335°F
Control turns on at 334°F
Actual maximum oven temperature = 347°F
Control turns off at 340°F
335 + 347 = 682
9. Monitor the internal oven temperature and
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).
Fig. 25
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.
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.
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.
11. The calibration control is adjusted clockwise in
order to increase the set temperature and
counter clockwise to decrease the set
temperature.
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) Page 16 of 31
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
HEATING ELEMENT 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. 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.
A. If voltage is incorrect, find the source of the
problem.
B. If voltage is correct, check current draw
(amps) through the heating element lead
wires.
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) 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.
C. If unable to check current draw, a resistance
check may indicate a malfunctioning
element.
1) Turn the power switch OFF and
disconnect the electrical supply to the
oven.
HEATING ELEMENT VALUES
VOLT.
208 4 19 19 10
240 4 16.5 16.5 14.5
480 4 8 8 57
NOTES:
KW PER
ELEMENT
1. Values in the table are nominal.
Tolerance is +5/-10%.
2. Voltage values are @ 60HZ.
3. Resistance values (ohms) are @
room temperature.
AMPS PER
ELEMENT
1 PH 3 PH
OHMS PER
ELEMENT
BLOWER ADJUSTMENT
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove the blower motor and mounting
assembly by following steps 1 through 7 as
outlined under
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. If the blower is square then tighten motor
mounting bolts and proceed to step 4.
B. If the blower is not square continue
adjusting until proper spacing is achieved
then tighten motor mounting bolts.
NOTE: If necessary, place shims between motor and
frame.
BLOWER AND MOTOR under
2) Remove the lead wires from the
heating element and check resistance
(ohms). See Heating Elements
Values table.
3. Check for proper operation.
Page 17 of 31 F45534 (0415)
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
ASSEMBLY (INDEPENDENT DOORS)
and adjust as outlined in this procedure.
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.
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.
F45534 (0415) Page 18 of 31
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) ...................
Fan Speed Switch
(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
Blower Motor ......... Operates the oven cavity blower (convection fan).
Transformer .......... Provides 240VAC power to the oven control circuit and blower motor (480VAC models
Solid State
Temperature
Control ...............
High Limit
Thermostat ...........
1C .................... Provides power to heating elements when energized. 1C is energized by the temperature
Power ON Light ....... Lit whenever the power switch (S1) is turned to ON or Cool Down mode.
Controls the oven cavity lights.
Controls blower motor speed between High and Low settings.
when the doors are opened.
only).
Monitors temperature sensor and regulates the oven cavity temperature by controlling
1CON to energize the heating elements when the control calls for heat.
Protects the oven from temperatures above 550°F by removing power from the heating
circuit. Auto resets at 500°F.
control when a call for heat is made.
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.
Page 19 of 31 F45534 (0415)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
COMPONENT LOCATION
Fig. 29
F45534 (0415) Page 20 of 31
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
Fig. 30
Page 21 of 31 F45534 (0415)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
Fig. 31
SEQUENCE OF OPERATION
Cook Cycle
1. 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.
F45534 (0415) Page 22 of 31
2. Power switch (S1) turned ON.
E. Oven doors closed (door switch contacts
CLOSED).
F. Oven cavity temperature below 140°F.
A. Power ON light (Amber) comes ON.
B. Solid state temperature control energized.
1) Heating elements powered and
heating starts.
2) 1C coil energized.
3) Heat light (Clear) comes on.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
C. Blower motor energized.
NOTE: Motor speed (Hi/Low) depends on position of
fan speed switch (S2).
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.
3. Set temperature dial to desired "Cook"
temperature.
4. Oven reaches set temperature.
A. Temperature control de-energizes internal
relay and the normally open (N.O.) contacts
OPEN.
1) Heat light goes out.
2) 1C coil de-energized.
a. Power removed from heating
elements and heating stops.
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.
B. Contacts 1 & 4 close.
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. Conditions.
A. Oven is ON.
B. Oven cavity temperature needs to be
lowered.
C. Doors are open (door switch 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.
3. If doors are CLOSED (door switch contacts
CLOSED):
A. Power ON light (Amber) comes ON.
B. Component cooling fan energized.
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. With the power switch turned ON, power is
supplied to "Cook" timer terminal 1.
2. Set "Cook" timer to desired time.
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.
C. Power is supplied to:
1) "Cook" timer terminal 1. If a time is
dialed, timer will operate and buzzer
will sound when timer reaches zero.
2) Oven cavity light switch (S3) wire #1.
Turns cavity lights ON/OFF; does not
affect Cool down cycle.
4. The oven will remain in this condition until the
power switch (S1).
Page 23 of 31 F45534 (0415)
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, 12.5 KW (240 VOLT) (208 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. (CO)
Y OVEN LAMP, 40W, 230V
AB WIRE NUT BLUE
Page 25 of 31 F45534 (0415)
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.T
C LIGHT, 250V, CLEAR
C1 LIGHT, 250V, CLEAR
Page 27 of 31 F45534 (0415)
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - ELECTRICAL OPERATION
VC3ED 480V WIRE DIAGRAM TABLE
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. (CO)
Y OVEN LAMP, 40W, 230V
AB WIRE NUT BLUE
AC WIRE SET, LIMIT SWITCH
AD TRANSFORMER, 480 TO 240V
F45534 (0415) Page 28 of 31
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
SYMPTOMS POSSIBLE CAUSES
1. Line voltage incorrect.
2. Fuse.
Blower motor doesn’t run with power switch in "ON"
"COOL DOWN" or position.
Blower motor doesn’t run with power switch "ON", but
oven heats.
Blower motor doesn’t run in "Cool Down", but runs OK in
"ON" position.
Excessive Heat in oven.
Low heat in oven.
3. Power switch (S1) malfunction.
4. Fan speed switch (S2) malfunction.
5. Interconnecting wiring malfunction.
6. Motor inoperative.
1. Door switch malfunction.
2. Fan speed switch (S2) malfunction.
3. Interconnecting wiring malfunction.
4. Motor inoperative.
1. Power switch (S1) malfunction.
2. Interconnecting wiring malfunction.
1. Temperature probe malfunction.
2. Temperature control not calibrated.
3. Contactor malfunction.
4. Heating element(s) malfunction.
1. Line voltage incorrect.
2. High limit thermostat OPEN.
3. Contactor malfunction.
4. Heating element(s) malfunction.
5. Temperature probe malfunction.
6. Temperature calibration.
Timer inoperative or not functioning properly.
Component cooling Fan does not run.
F45534 (0415) Page 30 of 31
1. Interconnecting wiring malfunction.
2. Timer malfunction.
1. Interconnecting wiring malfunction.
2. Fan motor inoperable.
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.
Uneven Cooking.
Intermittent operation problems.
Oven will not turn on.
No heat, convection fan motor runs.
No power to temperature control.
5. Contactor malfunction.
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.
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.
5. Temperature control malfunction.
1. Power switch (S1) in "Cool Down".
2. Door switch malfunction.
1. Doors out of adjustment.
Door does not seal or shut properly
2. Door catch roller out of adjustment or broken
(independent doors).
3. Door seals damaged.
Page 31 of 31 F45534 (0415)
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