Vulcan-Hart ML-126743 User manual

VC4E & VC6E Series Full Size
Electric Convection Ovens
VC4ES ML-126743
VC4ED ML-126744
VC4EC ML-126745
VC6ES ML-126746
VC6ED ML-126747
VC6EC ML-126748
- 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
F25105 Rev. B (0217)

TABLE OF CONTENTS
SERVICE UPDATES ....................................................................................... 4
SERVICE UPDATES - VC4E / VC6E .................................................................... 4
GENERAL .................................................................................................. 5
INTRODUCTION ....................................................................................... 5
INSTALLATION ........................................................................................ 5
OPERATION ........................................................................................... 5
CLEANING ............................................................................................. 5
LUBRICATION ......................................................................................... 5
TOOLS ................................................................................................. 5
SPECIFICATIONS ...................................................................................... 6
REMOVAL AND REPLACEMENT OF PARTS ............................................................... 7
COVERS AND PANELS ................................................................................ 7
CONTROL PANEL COMPONENTS ..................................................................... 8
COMPONENT PANEL COMPONENTS ................................................................. 9
TEMPERATURE PROBE (SOLID STATE CONTROL) .................................................. 10
HEATING ELEMENTS ................................................................................ 10
BLOWER AND MOTOR ............................................................................... 12
DOOR SWITCH ....................................................................................... 13
DOOR WINDOW ...................................................................................... 13
OVEN DOORS AND BEARINGS (INDEPENDENT DOORS) ............................................ 14
OVEN DOORS (SIMULTANEOUS DOORS) ........................................................... 15
ROLLER LATCH ASSEMBLY (INDEPENDENT DOORS) ............................................... 16
DOOR CATCH ROLLER ASSEMBLY (INDEPENDENT DOORS) ....................................... 17
MECHANICAL (KX) THERMOSTAT ................................................................... 17
HIGH LIMIT THERMOSTAT ........................................................................... 17
INTERIOR LIGHTS .................................................................................... 18
COOLING FAN ........................................................................................ 19
SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 20
SOLID STATE TEMPERATURE CONTROL CALIBRATION ............................................ 20
MECHANICAL (KX) THERMOSTAT CALIBRATION .................................................... 22
SOLID STATE TEMPERATURE CONTROL TEST ..................................................... 23
TEMPERATURE PROBE TEST (SOLID STATE CONTROL) ........................................... 24
HEATING ELEMENT TEST ............................................................................ 25
BLOWER ADJUSTMENT .............................................................................. 25
DOOR ADJUSTMENT ................................................................................. 26
DOOR STRIKE ADJUSTMENT (INDEPENDENT DOORS) ............................................. 27
DOOR CATCH ROLLER ADJUSTMENT (INDEPENDENT DOORS) .................................... 27
DOOR SWITCH ADJUSTMENT ....................................................................... 28
DOOR CHAIN ADJUSTMENT (SIMULATANEOUS DOORS) ........................................... 29
COMPUTER CONTROL ............................................................................... 29
COMPUTER CONTROL TEMPERATURE CALIBRATION .............................................. 31
COMPUTER CONTROL OPERATIONAL TEST ........................................................ 32
ELECTRICAL OPERATION ................................................................................ 34
COMPONENT FUNCTION ............................................................................ 34
COMPONENT LOCATION ............................................................................. 35
SEQUENCE OF OPERATION - VC4ES, VC6ES WITH MECHANICAL KX THERMOSTAT .............. 39
SEQUENCE OF OPERATION - VC4ED, VC6ED WITH SOLID STATE TEMPERATURE CONTROL ..... 39
SEQUENCE OF OPERATION - VC4EC, VC6EC (COMPUTER CONTROL) ............................. 40
SCHEMATICS AND WIRING DIAGRAMS .............................................................. 42
TROUBLESHOOTING ..................................................................................... 61
ALL MODELS ......................................................................................... 61
COMPUTER CONTROL MODELS ONLY .............................................................. 62
VC4E & VC6E Series Full Size Electric Convection Ovens
F25105 Rev. B (0217) Page 2 of 64

VC4E & VC6E Series Full Size Electric Convection Ovens
© VULCAN 2017
Page 3 of 64 F25105 Rev. B (0217)

SERVICE UPDATES
SERVICE UPDATES - VC4E / VC6E
February 2017
Updated Data Module
• SOLID STATE TEMPERATURE CONTROL
CALIBRATION
VC4E & VC6E Series Full Size Electric Convection Ovens - SERVICE UPDATES
F25105 Rev. B (0217) Page 4 of 64

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.
FEATURES
MODEL CAVITY DEPTH TEMPERATURE
CONTROL DOORS (50/50) COOK TIMER
VC4ES 426.5" Mechanical (KX) Independent (see note 1,2) 1-Hour Dial
VC4ED 26.5" Solid State Independent (see note 1,3) 1-Hour Dial
VC4EC 26.5" Computer Independent (see note 1,3) 24-Hour Digital
VC6ES 430.5" Mechanical (KX) Independent (see note 1,2) 1-Hour Dial
VC6ED 30.5" Solid State Independent (see note 1,3) 1-Hour Dial
VC6EC 30.5" Computer Independent (see note 1,3) 24-Hour Digital
NOTES:
1 Simultaneous doors are optional (with or w/o window).
2 Stainless steel doors w/o window (standard).
3 Stainless steel doors with window (standard)
4 In February 2001, this model was discontinued.
OPTIONS
MODEL COOK TIMER ROAST & HOLD
VC4ES 45-Hour Dial N/A
VC4ED 5-Hour Dial N/A
VC4EC Built in Built in
VC6ES 45-Hour Dial N/A
VC6ED 5-Hour Dial N/A
VC6EC Built in Built in
INSTALLATION
Refer to the Instructions Manual F31159 for detailed
installation instructions on single or stacked ovens.
OPERATION
Refer to the Instructions Manual F31159 for specific
operating instructions.
CLEANING
Refer to the Instructions Manual F31159 for specific
cleaning instructions.
LUBRICATION
• Cavity blower motor has sealed bearings and
requires no additional lubrication.
• Huskey’s TF1000 grease or equivalent high
temperature non-stick grease.
TOOLS
Standard
• Standard set of hand tools
VC4E & VC6E Series Full Size Electric Convection Ovens - GENERAL
Page 5 of 64 F25105 Rev. B (0217)

• VOM with A.C. current tester (Any quality VOM
with a sensitivity of at least 20,000 ohms per volt
can be used)
• Gear Puller to remove blower
• Temperature tester (thermocouple type)
Special
• Manometer
• Clamp on amp meter
• Spring force gauge, pull type with a minimum 30
pound full scale range (purchase locally)
• RTV sealant, 736 DOW silicone high temp (P/N
542133) or equivalent
SPECIFICATIONS
AMPERAGE - 3 PHASE/ 60HZ
MODEL
TOTAL
POWER
(KW)
PER LINE 1RECOMMENDED CIRCUIT
PROTECTION 2
208V 240V 480V 208V 240V 480V
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
12.5 35 33 15 45 40 20
NOTES:
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
AMPERAGE - 1 PHASE/ 60HZ
MODEL
TOTAL
POWER
(KW)
PER LINE 1RECOMMENDED CIRCUIT
PROTECTION 2
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
12.5 60 52 26 80 70 35
NOTES:
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.
VC4E & VC6E Series Full Size Electric Convection Ovens - GENERAL
F25105 Rev. B (0217) Page 6 of 64

REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
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. 1
2. Reverse the procedure to install.
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 the cover from the oven.
Fig. 2
2. Reverse the procedure to install.
Control Panel
1. Remove three (3) screws on the right side which
secure the control panel then pull the panel away
from the oven.
Fig. 3
NOTE: If the oven has a mechanical (KX type)
thermostat, it must be removed from the control panel
first, before removing the control panel.
2. Disconnect the temperature probe leads from the
solid state temperature control.
3. Unplug the wire harness connector to the control
panel components.
4. Reverse the procedure to install.
Right Side Panel
1. Remove the two screws near front of oven, which
secure the bottom front cover and control panel.
2. Remove the remaining seven screws securing
the right side panel.
Fig. 4
3. Pull the right side panel out at the bottom then
down to remove.
4. Reverse the procedure to install.
Left Side Panel
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 7 of 64 F25105 Rev. B (0217)

1. Remove the screws which secure the left side of
the top front cover, bottom front cover and control
panel.
2. Remove the seven screws securing the left side
panel.
Fig. 5
3. Pull the left side panel out at the bottom then
down to remove.
4. Reverse the procedure to install.
CONTROL PANEL COMPONENTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
Removable Components
1. Remove the control panel as outlined under
COVERS AND PANELS.
2. Remove the component being replaced.
3. Reverse the procedure to install the replacement
component, then check oven for proper
operation
Fig. 6
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
F25105 Rev. B (0217) Page 8 of 64

Fig. 7
COMPONENT PANEL
COMPONENTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
Removable Components
1. Remove the right side panel as outlined under
COVERS AND PANELS.
NOTE: If right side panel is not accessible, this
component can be serviced by removing the control
panel as outlined under COVERS AND PANELS.
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.
Fig. 8
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 9 of 64 F25105 Rev. B (0217)

Fig. 9
TEMPERATURE PROBE (SOLID
STATE CONTROL)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the right side panel as outlined under
COVERS AND PANELS.
NOTE: If right side panel is not accessible, this
component can be serviced by removing the control
panel as outlined under COVER AND PANELS.
2. Disconnect the probe leads from the solid state
temperature control.
3. Remove the racks and right rack support.
4. Remove the probe guard or mounting clips.
Fig. 10
Fig. 11
5. Remove probe by pushing it through the oven
wall and into the control panel area.
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. Adjust the temperature control as outlined under
SOLID STATE TEMPERATURE CONTROL
CALIBRATION in SERVICE PROCEDURES
AND ADJUSTMENTS.
HEATING ELEMENTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
NOTE: Starting with production in October, 2001, the
top cavity panel will have 3/4" square holes for easier
element removal. Ovens manufactured prior to this
date have 1/2" round holes that sometimes make it
difficult to remove elements thru the cavity. A serial
number cut off will not be available. Follow the
procedures for element removal as outlined below.
Front Access
1. Remove the oven racks and rack supports.
2. Remove the "top" door seal from the oven.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
F25105 Rev. B (0217) Page 10 of 64

3. Determine if the heating element to replace is on
the left or right side in the oven cavity. The
element locations from front to back are: Right
side - R1, R2 & R3; Left side - R4, R5 & R6.
A. Measure the current draw of the heating
elements as outlined under HEATING
ELEMENT TEST in SERVICE
PROCEDURES AND ADJUSTMENTS.
4. From inside the oven cavity, remove the
perforated panel from the same side of the
element being replaced.
Fig. 12
A. If removing the right side panel, also remove
the probe guard or mounting clips.
B. Run the probe wire thru the panel opening
before lifting panel out.
5. From the element being replaced, remove the
hold down clamps, the mounting bracket screws
at the top, then remove the element.
Fig. 13
NOTE: The mounting bracket is sealed with RTV
which may still hold the element after the screws are
removed. Also, in some cases, the ring terminal
connected to the element may interfere with easy
removal. If access to the left side panel and/or the top
panel is available, see ALTERNATE ACCESS.
6. Disconnect the lead wires from the element.
7. Clean RTV residue from the mating surface
inside the oven, apply new high temperature RTV
to the heating element mounting bracket and
reverse procedure to install.
8. Check for proper operation.
Alternate Access
NOTE: If the heating element is not easy to remove
from inside the oven cavity, and access to the left side
panel and/or the top panel is available, this alternate
removal method may be used.
NOTE: On stacked ovens, if the bottom oven is being
serviced and the heating element to replace is on the
right side, the ovens must be unstacked to access the
heating element terminals through the top. Once
unstacked, follow the removal procedure below.
1. Perform steps 1 thru 4 under FRONT ACCESS.
2. If the element is on the left side:
A. the insulation at the top to expose the
element terminals.
B. Remove the lead wires from the element
being replaced. Proceed to step 4.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 11 of 64 F25105 Rev. B (0217)

3. If the element is on the right side:
A. Remove the top panel and pull back the
insulation to expose the element terminals.
B. Remove the lead wires from the element
being replaced.
4. clamps holding the element vertical, the screw's
securing mounting bracket at the top, and then
remove the element.
NOTE: The mounting bracket is sealed with RTV
which may still hold the element after the screws are
removed.
5. Clean RTV residue from the mating surface
inside the oven, apply new high temperature RTV
to the heating element mounting bracket and
reverse procedure to install.
6. Check for proper operation.
BLOWER AND MOTOR
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Take out the racks and rack supports.
2. Remove screws securing baffle panel and
remove the panel.
Fig. 14
3. If replacing:
A. Blower Only - Loosen set screws 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 in SERVICE
PROCEDURES AND
ADJUSTMENTS.
B. Motor - perform step 3A and continue
procedure.
4. Remove the nuts that secure the motor mounting
plate to the rear wall.
Fig. 15
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.
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.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
F25105 Rev. B (0217) Page 12 of 64

Fig. 16
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. 17
11. Slide blower onto motor shaft until hub is flush
with end of shaft then tighten set screws.
12. Adjust motor position until blower is parallel to
motor mounting plate as outlined under
BLOWER ADJUSTMENT in SERVICE
PROCEDURES AND ADJUSTMENTS.
13. Position motor mounting plate on the rear wall
and secure with nuts and washers.
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.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the top front cover as outlined under
COVERS AND PANELS.
2. Disconnect the lead wires to the door switch.
3. Remove the switch.
Fig. 18
4. Reverse procedure to install the replacement
switch and check for proper adjustment as
outlined under DOOR SWITCH ADJUSTMENT
in SERVICE PROCEDURES AND
ADJUSTMENTS.
DOOR WINDOW
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the screws at the top and bottom of
door.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 13 of 64 F25105 Rev. B (0217)

Fig. 19
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. 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.
1) Lift out the inner door panel and
window assembly.
2) If replacing window on the right door,
remove the screws along the inside
edge (if applicable) of the door then
remove the inner door panel and
window assembly.
4. Remove the screws securing the window "tabs"
to the door bracket and lift the window assembly
out from the door frame.
Fig. 20
5. Reverse procedure to install the replacement
window.
OVEN DOORS AND BEARINGS
(INDEPENDENT DOORS)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the top front cover and bottom front
cover as outlined under COVERS AND
PANELS.
2. Remove the door switch lever.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
F25105 Rev. B (0217) Page 14 of 64

Fig. 21
3. Remove the lower door seal strip to expose the
mounting screws of the door assembly.
4. Remove the two (2) lower sill bolts by the lower
door shaft and the four (4) counter-sunk screws
from the lower sill.
Fig. 22
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. Tilt the top of the door slightly forward and lift the
door up until the bottom of the door shaft clears
the opening in the sill.
6. Lay the door flat to prevent damage.
7. The top and bottom bearings are now accessible
for inspection and/or replacement if needed.
A. If bearings are ok, proceed to step 8.
B. If replacing the top bearing, remove the top
bearing retainer and top bearing.
Fig. 23
C. If replacing the bottom bearing, remove it
from the door shaft or the lower sill opening.
8. Reverse procedure to install door assembly and
check for proper adjustment as outlined under
DOOR ADJUSTMENT and DOOR SWITCH
ADJUSTMENT in SERVICE PROCEDURES
AND ADJUSTMENTS.
OVEN DOORS (SIMULTANEOUS
DOORS)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
Assembly Removal
1. Remove the top front cover and bottom front
cover as outlined under COVERS AND
PANELS.
2. Remove the door switch lever.
Fig. 24
3. Remove the top bearing retainers and top
bearings.
Fig. 25
4. Remove the lower door seal strip to expose the
mounting screws of the door assembly.
A. Remove the two (2) lower sill bolts by the
lower door shaft and the four (4) counter-
sunk screws from the lower sill.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 15 of 64 F25105 Rev. B (0217)

Fig. 26
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. 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. Reverse procedure to install door assembly and
check for proper adjustment as outlined under
DOOR ADJUSTMENT, DOOR CHAIN
ADJUSTMENT (SIMULTANEOUS DOORS) and
DOOR SWITCH ADJUSTMENT in SERVICE
PROCEDURES AND ADJUSTMENTS.
Disassembly
1. Remove the door assembly as outlined in OVEN
DOORS (SIMULTANEOUS) under ASSEMBLY
REMOVAL.
2. Remove the door chain by loosening one of the
turnbuckles.
3. Loosen the set screw on the sprocket of door
being replaced.
4. Drive out the spirol pin from the sprocket of door
being replaced.
5. Remove the door from lower sill bearings and
sprocket.
Fig. 27
A. Door assembly parts are now accessible for
inspection and/or replacement if necessary.
6. Reverse procedure to re-assemble the door
assembly parts and check for proper adjustment
as outlined under DOOR CHAIN ADJUSTMENT
(SIMULTANEOUS DOORS) in SERVICE
PROCEDURES AND ADJUSTMENTS.
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.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the screws that attach roller latch
assembly to door.
Fig. 28
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
F25105 Rev. B (0217) Page 16 of 64

2. Reverse procedure to install.
DOOR CATCH ROLLER ASSEMBLY
(INDEPENDENT DOORS)
NOTE: For units with serial number starting with 48
made before 8/13/07 and serial number starting with
54 made before 8/27/07.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the top front cover as outlined under
COVERS AND PANELS.
2. Remove the catch roller assembly.
Fig. 29
3. Reverse procedure to install.
4. Adjust the catch roller as outlined under DOOR
CATCH (ROLLER) ADJUSTMENT
(INDEPENDENT DOORS) in SERVICE
PROCEDURES AND ADJUSTMENTS.
MECHANICAL (KX) THERMOSTAT
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the racks and right rack support.
2. Remove the thermostat knob and mounting
screws from the control panel and then remove
the control panel.
3. Remove the probe guard from the oven cavity
wall.
Fig. 30
NOTE: When installing probe guard, the probe should
not extend beyond the guard.
4. Remove the thermostat bulb from the oven cavity
by pushing it through the oven wall and into the
control panel area.
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.
5. Reverse the procedure to install.
6. Adjust the thermostat as outlined under
MECHANICAL (KX) THERMOSTAT
CALIBRATION in SERVICE PROCEDURES
AND ADJUSTMENTS.
HIGH LIMIT THERMOSTAT
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Take out racks from the oven.
2. Remove the high limit thermostat cover/mounting
plate from inside the oven cavity at the top.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 17 of 64 F25105 Rev. B (0217)

Fig. 31
3. Disconnect lead wires from high limit thermostat
then remove high limit thermostat from cover/
mounting plate.
Fig. 32
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.
INTERIOR LIGHTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
Lamp
1. Remove the racks.
2. Unscrew the glass lens for the light being
replaced then unscrew the bulb.
Fig. 33
3. Replace bulb then reverse the procedure to
install.
Lamp Assembly
1. Remove the lens and bulb.
2. Remove the springs from the retaining tabs (2
places) on the socket.
Fig. 34
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.
7. Install the light bulb and lens.
8. Check for proper operation.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
F25105 Rev. B (0217) Page 18 of 64

COOLING FAN
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
There may be multiple circuits. Be sure
all circuits are disconnected.
1. Remove the right side panel as outlined under
COVERS AND PANELS.
NOTE: If right side panel is not accessible, this
component can be serviced by removing the control
panel as outlined under COVERS AND PANELS.
2. removing wire nuts.
3. Remove the screws securing the air deflector to
the fan then loosen the tab screw holding the fan
to the component panel. Rotate the tab so that
the fan will clear and remove the fan.
Fig. 35
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.
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.
VC4E & VC6E Series Full Size Electric Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS
Page 19 of 64 F25105 Rev. B (0217)

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
UNITS BEFORE JUNE 2013
1. Place a thermocouple in geometric center of
oven cavity.
2. Set ON-OFF-COOL DOWN switch to ON.
3. Set temperature control dial to 350°F.
4. Allow oven temperature to stabilize (normally 3
cycles).
5. Record temperature at which Heat lamp goes
OFF and comes ON for at least two complete
heating cycles.
6. Calculate differential by subtracting temperature
indicated when lamp goes out from temperature
indicated when lamp comes on.
Differential = Heat lamp OFF - Heat lamp ON
Example: 360° (lamp off) - 340° (lamp on) =
20°
A. Calculated differential should be less than
20°F.
1) If differential is less than 20°F,
temperature control circuit is
functioning properly.
a. Proceed to Step 7.
2) If differential is more than 20°F:
a. Check temperature probe as
outlined under TEMPERATURE
PROBE TEST (SOLID STATE
CONTROL).
b. If probe is functioning properly
then temperature control is
malfunctioning.
a) Install a replacement
temperature control and
check calibration.
7. Calculate average temperature by adding
temperature indicated when lamp goes out to
temperature indicated when lamp comes on and
dividing this answer by 2.
[Temp. (lamp off) + Temp. (lamp on)] ÷ 2 =
Average Temp. Example: (360° + 340°) ÷ 2 =
350°
A. If average temperature is less than 10°F
from dial setting, thermostat is properly
calibrated.
B. If average temperature is more than 10°F
from dial setting, thermostat calibration
must be adjusted.
1) Loosen temperature control knob set
screw and remove knob from stem.
2) Loosen temperature control mounting
screws only enough to rotate control.
a. Place thumb and forefinger on
mounting screw heads, apply
pressure and slightly rotate screw
heads (body of control) in slot.
Rotate clockwise to increase
temperature and
counterclockwise to decrease.
b. Center stem (Fig. 36) in opening
and re-tighten temperature
control mounting screws.
VC4E & VC6E Series Full Size Electric Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 Rev. B (0217) Page 20 of 64