Vulcan Materials Vc4Ec Users Manual
2015-02-05
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Page Count: 60
A product of VULCAN-HART LOUISVILLE, KY 40201-0696
F25105 (Rev. A, October 2007)
- NOTICE -
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly qualified.
If you have attended a Vulcan Service School for this product, you
may be qualified to perform all the procedures described in this
manual.
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.
Reproduction or other use of this Manual, without the express
written consent of Vulcan, is prohibited.
VC4ED SHOWN
SERVICE MANUAL
VC4E & VC6E
SERIES
FULL SIZE
ELECTRIC CONVECTION
OVENS
MODEL ML
VC4ES 126743
VC4ED 126744
VC4EC 126745
VC6ES 126746
VC6ED 126747
VC6EC 126748
FULL SIZE ELECTRIC CONVECTION OVENS
F25105 (Rev. A, October 2007) Page 2 of 60
TABLE OF CONTENTS
GENERAL ................................................................................ 4
Introduction ............................................................................ 4
Installation ............................................................................ 4
Operation ............................................................................. 4
Cleaning .............................................................................. 4
Lubrication ............................................................................ 4
Tools................................................................................. 4
Specifications .......................................................................... 5
REMOVAL AND REPLACEMENT OF PARTS .................................................... 6
Covers and Panels ...................................................................... 6
Control Panel Components ............................................................... 7
Component Panel Components ............................................................ 8
Temperature Probe (Solid State Control) ..................................................... 8
Heating Elements ....................................................................... 9
Blower and Motor ...................................................................... 10
Door Switch .......................................................................... 11
Door Window ......................................................................... 12
Oven Doors and Bearings (Independent Doors) .............................................. 12
Oven Doors (Simultaneous Doors) ......................................................... 13
Roller Latch Assembly .................................................................. 14
Door Catch Roller Assembly (Independent Doors) ............................................ 14
Mechanical (KX) Thermostat ............................................................. 15
High Limit Thermostat .................................................................. 15
Interior Lights ......................................................................... 16
Cooling Fan .......................................................................... 16
SERVICE PROCEDURES AND ADJUSTMENTS................................................. 17
Solid State Temperature Control Calibration ................................................. 17
Mechanical (KX) Thermostat Calibration .................................................... 18
Solid State Temperature Control Test ...................................................... 19
Temperature Probe Test (Solid State Control) ................................................ 20
Heating Element Test ................................................................... 20
Blower Adjustment ..................................................................... 21
Door Adjustment....................................................................... 22
Door Strike Adjustment (Independent Doors) ................................................. 22
Door Catch Roller Adjustment (Independent Doors) ........................................... 23
Door Switch Adjustment ................................................................. 24
Door Chain Adjustment (Simultaneous Doors) ................................................ 24
Computer Control ...................................................................... 25
Computer Control Temperature Calibration .................................................. 26
FULL SIZE ELECTRIC CONVECTION OVENS
F25105 (Rev. A, October 2007)Page 3 of 60
Computer Control Operational Test ........................................................ 27
ELECTRICAL OPERATION .................................................................. 29
Component Function ................................................................... 29
Component Location ................................................................... 30
Sequence of Operation .................................................................. 34
VC4ES, VC6ES with Mechanical KX Thermostat.......................................... 34
VC4ED, VC6ED with Solid State Temperature Control ..................................... 34
Timer Cycle, Cooking (KX Thermostat or Solid State Control)................................ 34
Cool Down Cycle (KX Thermostat or Solid State Control) ................................... 35
VC4EC, VC6EC (Computer Control) ................................................... 35
Temperature and Time Cycle (Cooking) ............................................. 36
Cook and Hold Cycle ........................................................... 36
Cool Down Cycle .............................................................. 36
Schematics ........................................................................... 37
VC4ES, VC6ES with Mechanical (KX) Controls, 208-240V .................................. 37
VC4ES, VC6ES with Mechanical (KX) Controls, 480V ..................................... 38
VC4ED, VC6ED with Solid State Temperature Control, 208-240V ............................ 39
VC4ED, VC6ED with Solid State Temperature Control, 480V ................................ 40
VC4EC, VC6EC Computer Control, 208-240V (Roast & Hold Standard) ........................ 41
VC4EC, VC6EC Computer Control, 480V (Roast & Hold Standard) ........................... 42
Wiring Diagrams ....................................................................... 44
VC4ES, VC6ES with Mechanical (KX) Control, 208-240V ................................... 44
VC4ES, VC6ES with Mechanical (KX) Control, 480V ...................................... 46
VC4ED, VC6ED with Solid State Temperature Control, 208-240V ............................ 48
VC4ED, VC6ED with Solid State Temperature Control, 480V ................................ 50
VC4EC, VC6EC Computer Control, 208-240V (Roast & Hold Standard) ........................ 52
VC4EC, VC6EC Computer Control, 480V (Roast & Hold Standard) ........................... 54
TROUBLESHOOTING ...................................................................... 56
All Models ............................................................................ 56
Computer Control Models Only ........................................................... 57
© Vulcan 2007
FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
F25105 (Rev. A, October 2007) Page 4 of 60
GENERAL
INTRODUCTION
Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of any model
unless the picture or illustration needs to be model specific.
Models
MODEL
FEATURES OPTIONS
CAVITY
DEPTH
TEMPERATURE
CONTROL
DOORS
(50/50)
COOK
TIMER
COOK
TIMER
COOK &
HOLD
VC4ES 426.5" Mechanical (KX) Independent 1, 2 1-Hour Dial 5-Hour Dial N/A
VC4ED 26.5" Solid State Independent 1, 3 1-Hour Dial 5-Hour Dial N/A
VC4EC 26.5" Computer Independent 1, 3 24-Hour Digital Built in Built in
VC6ES 430.5" Mechanical (KX) Independent 1, 2 1-Hour Dial 5-Hour Dial N/A
VC6ED 30.5" Solid State Independent 1, 3 1-Hour Dial 5-Hour Dial N/A
VC6EC 30.5" Computer Independent 1, 3 24-Hour Digital Built in Built in
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.
INSTALLATION
Refer to the Instructions Manual for detailed
installation instructions on single or stacked ovens.
OPERATION
Refer to the Instructions Manual for specific
operating instructions.
CLEANING
Refer to the Instructions Manual for specific cleaning
instructions.
LUBRICATION
!Cavity blower motor has sealed bearings and
requires no additional lubrication.
!Huskey’s TF1000 grease or equivalent high
temperature Teflon grease.
TOOLS
Standard
!Standard set of hand tools
!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
FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
F25105 (Rev. A, October 2007)Page 5 of 60
SPECIFICATIONS
Electrical
MODEL
TOTAL
POWER
(KW)
AMPERAGE - 3 PHASE/ 60HZ
PER LINE 1
RECOMMENDED
CIRCUIT
PROTECTION 2
208V 240V 480V 208V 240V 480V
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
12.5 353315454020
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.
MODEL
TOTAL
POWER
(KW)
AMPERAGE - 1 PHASE/ 60HZ
PER LINE 1
RECOMMENDED
CIRCUIT
PROTECTION 2
208V 240V 480V 208V 240V 480V
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
12.5 605226807035
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.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007) Page 6 of 60
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
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.
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.
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.
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.
3. Pull the right side panel out at the bottom then
down to remove.
4. Reverse the procedure to install.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007)Page 7 of 60
Left Side Panel
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.
3. Pull the left side panel out at the bottom then
down to remove.
4. Reverse the procedure to install.
CONTROL PANEL
COMPONENTS
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.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007) Page 8 of 60
COMPONENT PANEL
COMPONENTS
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.
TEMPERATURE PROBE
(SOLID STATE CONTROL)
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 probe leads from the solid state
temperature control.
3. Remove the racks and right rack support.
4. Remove the probe guard or mounting clips.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007)Page 9 of 60
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
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.
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.
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.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007) Page 10 of 60
LEFT SIDE ELEMENTS SHOWN
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
If the heating element is not removing easily 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. Remove the left side panel and pull back
the insulation at the top to expose the
element terminals.
B. Remove the lead wires from the element
being replaced. Proceed to step 4.
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. From the same element, remove the two
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
1. Take out the racks and rack supports.
2. Remove screws securing baffle panel and
remove the panel.
3. If replacing:
A. Blower Only - Loosen set screws on blower
hub and using a bearing puller, remove
blower from motor shaft.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007)Page 11 of 60
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.
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.
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.
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
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.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007) Page 12 of 60
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
1. Remove the screws at the top and bottom of
door.
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.
5. Reverse procedure to install the replacement
window.
OVEN DOORS AND BEARINGS
(INDEPENDENT DOORS)
1. Remove the top front cover and bottom front
cover as outlined under COVERS AND
PANELS.
2. Remove the door switch lever.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007)Page 13 of 60
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.
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.
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)
Assembly Removal
1. Remove the top front cover and bottom front
cover as outlined under COVERS AND
PANELS.
2. Remove the door switch lever.
3. Remove the top bearing retainers and top
bearings.
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.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007) Page 14 of 60
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.
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.
1. Remove the screws that attach roller latch
assembly to door.
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.
1. Remove the top front cover as outlined under
COVERS AND PANELS.
2. Remove the catch roller assembly.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007)Page 15 of 60
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
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.
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
1. Take out racks from the oven.
2. Remove the high limit thermostat
cover/mounting plate from inside the oven
cavity at the top.
3. Disconnect lead wires from high limit thermostat
then remove high limit thermostat from
cover/mounting plate.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
F25105 (Rev. A, October 2007) Page 16 of 60
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
Lamp
1. Remove the racks.
2. Unscrew the glass lens for the light being
replaced then unscrew the bulb.
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.
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.
COOLING FAN
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 lead wires to the fan motor by
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.
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.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007)Page 17 of 60
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. 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
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Set the power switch to ON.
3. Set the temperature control dial to 350 °F.
4. Allow the oven temperature to stabilize
(normally 3 cycles).
5. Record the temperature at which the Heat lamp
goes OFF and comes ON for at least two
complete heating cycles.
6. Calculate the differential by subtracting the
temperature indicated when the lamp goes out
from the temperature indicated when the lamp
comes on.
A. The differential calculated should be less
than 20 °F.
1) If the differential is 20 °F or less, the
temperature control circuit is
functioning properly.
a. Proceed to step 7.
2) If the differential is more than 20 °F:
a. Check the temperature probe as
outlined under "TEMPERATURE
PROBE TEST (SOLID STATE
CONTROL)".
b. If the probe is functioning
properly then temperature control
is malfunctioning.
a) Install a replacement
temperature control and
check calibration.
7. Calculate the average temperature by adding
the temperature indicated when the lamp goes
out to the temperature indicated when the lamp
comes on and dividing this answer by 2.
A. If the average temperature is 10 °F or
less, from the dial setting, the thermostat is
properly calibrated.
B. If the average temperature is more than
10 °F from the dial setting, the thermostat
calibration must be adjusted.
1) Loosen the temperature control knob
set screw and remove the knob from
the stem.
2) Loosen temperature control mounting
screws only enough to rotate the
control.
a. Place thumb and forefinger on
the head of the mounting screws,
apply pressure and slightly rotate
the screw heads (body of control)
in the slot. Rotate clockwise to
increase temperature and
counterclockwise to decrease.
b. Center the stem in the opening
and re-tighten the temperature
control mounting screws.
c. Replace knob and re-tighten set
screw.
d. Rotate the knob to the lowest
temperature setting then back to
350°F.
e. Repeat the average temperature
calculation in step 7.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007) Page 18 of 60
NOTE: Allow the oven to cycle at
least two times between
adjustments before performing
the calculation.
a) If the average temperature
still differs more than 10 °F
from the dial setting, adjust
the thermostat calibration
until the average
temperature is within
tolerance.
C. If the above adjustment cannot be
obtained:
1) Turn the power switch OFF.
2) Replace the temperature control and
check calibration.
MECHANICAL (KX)
THERMOSTAT CALIBRATION
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Set the power switch to ON.
3. Set the thermostat dial to 350 °F.
4. Allow the oven temperature to stabilize
(normally 3 cycles).
5. Record the temperature when the thermostat
cycles OFF and ON for at least three complete
cycles.
6. Calculate the differential by subtracting the
temperature indicated when heat lamp goes out
from temperature indicated when heat lamp
comes on.
A. The differential calculated should be less
than 30EF.
1) If the differential is 30 °F or less, the
thermostat is functioning properly.
a. Proceed to step 7.
2) If the differential is more than 30 EF,
the thermostat is malfunctioning.
a. Install a replacement thermostat
and check calibration.
7. Calculate the average temperature by adding
the temperature indicated when the heat lamp
goes out to the temperature indicated when the
heat lamp comes on and dividing this answer by
2.
A. If the average temperature is 15 EF or less
from the dial setting, the thermostat is
properly calibrated.
B. If the average temperature is more than
15 EF of the dial setting, the thermostat
calibration must be adjusted.
1) Remove the thermostat knob.
2) Hold the thermostat shaft and turn the
inner set screw clockwise to decrease
temperature or counterclockwise to
increase temperature (¼ turn = 35EF).
8. Replace the knob and verify the setting is still at
350°F.
9. Repeat step 7 until the average temperature is
within tolerance.
NOTE: Allow the oven to cycle at least two times
between adjustments before performing the
calculation.
A. After the final adjustment is made and the
average temperature is within tolerance,
remove the knob and apply a non-
permanent type sealer around the head of
the set screw.
10. If the above adjustment cannot be obtained:
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007)Page 19 of 60
A. Turn the power switch OFF.
B. Install a replacement thermostat and check
calibration.
SOLID STATE TEMPERATURE
CONTROL TEST
1. Remove the right side panel as outlined under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
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. Place a thermocouple in the geometric center of
the oven cavity.
NOTE: Oven temperature must be below 450°.
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.
6. Check for proper voltage across terminals 8 &
10 (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 208-240VAC controls - check across
terminals 7 & 10 for input to the internal
relay and 6 & 10 for output from the
internal relay.
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.
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 6 &
10 (208-240VAC) 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.
b. Replace the temperature control
and check calibration as outlined
under SOLID STATE
TEMPERATURE CONTROL
CALIBRATION.
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F25105 (Rev. A, October 2007) Page 20 of 60
TEMPERATURE PROBE TEST
(SOLID STATE CONTROL)
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 panel as outlined under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
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. 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 ohmmeter.
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%
HEATING ELEMENT TEST
The following steps require power
to be applied to the unit during the test. Use
extreme caution at all times.
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
table below for proper values.
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.
2) Remove the lead wires from the
heating element and check resistance
(ohms). See table below for proper
values.
3. Check for proper operation.
VOLTAGE KW PER
ELEMENT
AMPS PER
ELEMENT
LEAD
OHMS PER
ELEMENT
1 PH 3 PH
208 2603521
240 2523328
480 2 15 4 111
NOTES: 1. Values in the table are nominal.
Tolerance is +5/-10%.
2. Voltage values are @ 60HZ.
3. Resistance values (ohms) are @
room temperature.
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F25105 (Rev. A, October 2007)Page 21 of 60
BLOWER ADJUSTMENT
1. Remove the blower motor and mounting assembly by following steps 1 through 7 as outlined under BLOWER
AND MOTOR in 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.
4. Reverse the procedure to install.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007) Page 22 of 60
DOOR ADJUSTMENT
1. Check the doors to make sure they have an
equal gap between them and that the vertical
edge of the door is parallel to the vertical door
seal. If the doors are not positioned in this
manner, adjust the doors as described.
2. Remove the top front cover.
3. Loosen the screws that secure the upper door
bearings and related hardware, just enough to
allow door movement.
4. Move the door until proper alignment is
achieved then tighten the screws on the upper
door bearing hardware.
5. Repeat step 3 and 4 on the opposite door, if
necessary.
DOOR STRIKE ADJUSTMENT
(INDEPENDENT DOORS)
NOTE: For units with serial number starting with 48
made after 8/12/07 and serial number starting with
54 made after 8/26/07.
1. Remove top front cover as outline under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
2. Open the doors and inspect door strike for
proper shape.
A. Replace if bent. Do not bend strike plate.
B. If adjustment is necessary, loosen
fasteners, close doors and insure contact
between door inner surface and upper
horizontal seal. Slide door strike plate until
contact with roller latch is made. Tighten
strike plate fasteners
3. 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.
4. Each oven door should open with a force of 8 to
25 pounds when pulled at the handle. The
adjustments must allow the doors to remain
closed during normal operation and allow
opening without exertion by the user.
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F25105 (Rev. A, October 2007)Page 23 of 60
DOOR CATCH ROLLER
ADJUSTMENT
(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.
1. Remove the top front cover as outline under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
2. Open the doors and inspect the door strike for
proper shape.
A. Replace if bent and adjust as outlined in
this procedure.
3. Open and close the doors several times while
observing the catch roller operation.
A. Replace if malfunctioning and adjust as
outlined in this procedure.
NOTE: Shims may be required under the
door strike to raise it, before the proper
door tension adjustment can be set.
4. Apply lubricant around the spring. See
LUBRICATION under GENERAL.
5. Close the doors and check them for proper
alignment.
A. Doors should be centered and parallel at
the top and bottom, in the oven cavity
opening. See DOOR ADJUSTMENT.
6. With the doors closed, observe the position of
the catch roller "ball" in relation to the door
strike.
A. Ensure the catch roller "ball" is centered
(left to right) to the door strike.
1) Adjust alignment, if necessary.
B. Open the right side door and view the left
side door catch roller and strike. Ensure
the door catch roller "ball" is resting upon
the angular surface of the door strike.
Repeat on the opposite door.
1) If adjustment is necessary, loosen the
mounting screws then slide the door
strike from "front to back" until the
roller rests upon the angular surface
of the door strike. Tighten screws and
check operation.
2) If proper adjustment cannot be
achieved, add shims beneath the door
strike. Repeat step 6 thru this step.
DO NOT BEND THE DOOR STRIKE.
7. Each oven door should open with a force of 8 to
25 pounds when pulled at the handle. See
TOOLS under GENERAL.
A. Adjust catch roller tension as follows:
1) Turn the set screw inside the catch
assembly housing clockwise to
increase tension on the catch roller
and counterclockwise to decrease
tension on the catch roller.
NOTE: The amount of tension on the catch
roller determines the opening force of the
door.
2) Continue adjustment until proper door
operation is achieved.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007) Page 24 of 60
DOOR SWITCH ADJUSTMENT
1. Remove the top front cover as outlined under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
2. Door operation:
A. Independent doors - The switch actuator
should be operated by the switch lever
when the right door is between 1" and 1
1/2" from being closed.
B. Simultaneous doors - The switch actuator
should be operated by the switch lever
when the right door is 1/2" from being
closed.
3. If adjustment is necessary, bend the switch
actuator to obtain the proper setting.
4. Install the top front cover.
5. Apply power to the oven and check for proper
operation.
DOOR CHAIN ADJUSTMENT
(SIMULTANEOUS DOORS)
Introduction
When the oven doors are in proper adjustment, as
the doors come together, the right door will lead the
left door in closing by about 1/4 inch. The doors will
feel like they are self closing the last 1/2 inch of
travel.
Procedure
1. Remove the lower sill cover as outline under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
2. Close doors and check door chain for factory
setting.
A. Turnbuckles should be 5 to 5 1/2 inches
apart.
B. Short eye bolt should be connected to the
end of the chain that goes to the front of
the sprocket.
C. 2 links of the chain should not be engaged
at the rear of the sprocket.
D. Chain must be tight enough that the doors
move simultaneously when opened or
closed.
E. When the doors are opened, the
turnbuckles will move away from each
other.
F. The stop cable must be positioned where it
moves freely and does not get pinched.
3. Position door chain assembly to factory setting
if the conditions in step 2 are not met.
4. If right door does not lead the left door in
closing:
A. Loosen locknuts on both turnbuckles.
B. Loosen left turnbuckle.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007)Page 25 of 60
C. Tighten right turnbuckle.
D. Tighten locknuts on both turnbuckles.
5. If the right door leads the left door by more than
3/8 inch:
A. Loosen locknuts on both turnbuckles.
B. Loosen right turnbuckle.
C. Tighten left turnbuckle.
D. Tighten locknuts on both turnbuckles.
6. Check door for proper operation.
NOTE: The locknuts must be tight during testing or
the adjustment will not hold.
A. If doors do not close properly, repeat step
4, 5 and 6.
B. If doors operate properly, continue to step
7.
7. Install the lower front cover.
COMPUTER CONTROL
Operation
Refer to the Instructions Manual for specific
operating instructions.
Setup Mode
NOTE: Use the setup mode to verify that the control
is configured to the factory settings which result in
the proper operation of the oven. If the CAL1
parameter is other than zero, determine if it is still
needed before resetting to zero. See COMPUTER
CONTROL TEMPERATURE CALIBRATION.
Changing the C_F, InP1, rL1 & rH1
parameters will default all menus to the factory
settings.
1. Use this key sequence to access the setup
mode.
Up arrow; Rack 1; Temperature; Temperature;
Down arrow; Rack 1
2. Once in the setup mode the display will
alternate between the parameter and
programmed data.
• To change data to the factory setting, use
the arrow keys.
• To select the next parameter, press the
Rack 1 key.
• After the last Parameter and Data is
viewed, press the Rack 1 key a final time
to exit the setup mode and return to
operations mode. The current set point
temperature will be displayed.
• After 1 minute of no key activations, the
control will return to operation mode.
3. Listed are the parameters and data you should
find.
MENU
ALTERNATING ON
DISPLAY
PARAMETER DATA
Celsius_Fahrenheit C_F F
Guard Band gb 4000
Temperature
Compensation tcnP OFF
Input Type 1 InP1 J
Range Low 1 rL1 75
Range High 1 rH1 500
Hysteresis HYS1 3
Calibration Offset CAL1 0
Exit Setup Mode and
return to Operation
Mode.
set point temperature is
displayed or if call for
heat, dashes (----)
displayed.
Probe Test
If the oven is not heating or displaying the proper
temperature, the temperature probe may be
malfunctioning. Determine if the probe is good or
causing the operational problem. Temporarily,
disconnect the existing probe lead wires from the
computer control and connect the lead wires from a
known good "J" type thermocouple. Secure the
sensing end of the thermocouple near the probe.
Turn the power switch ON and set the dial to 350°F.
If the oven reaches the set temperature and cycles
with the temporary thermocouple, then the existing
probe is malfunctioning. Replace temperature probe
with the correct part and check for proper operation.
Solid State Relay Test
The solid state relays "SSR1 or SSR2" supply power
to the blower motor "high" or "low" fan speed
terminals when the SSR is energized by the output
voltage from the computer.
To test solid state relay "SSR1" (high fan speed), the
computer control should be in the "Normal Cooking
Mode". To test solid state relay "SSR2" (low fan
speed), the computer control should be in the "Cook
& Hold Mode".
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F25105 (Rev. A, October 2007) Page 26 of 60
1. Remove the right side panel as outlined under
COVERS AND PANELS.
2. Turn the power switch ON.
A. If the blower motor comes on, the SSR is
functioning properly.
B. If the blower motor does not come on,
proceed to step 3.
3. Check for +5 VDC on the input side of SSR
(terminals 3 & 4).
A. If +5 VDC is present, continue to step 4.
B. If no voltage is present, computer control is
not functioning properly.
4. Check for proper input voltage on the load side
of SSR terminal 1 and the power connection on
the other side of the supply.
A. On 208 & 240 volt ovens, the supply
connection is on the terminal block (L2 for
single phase, L3 for three phase).
The measured voltage should be identical
to the supply.
B. On 480 volt ovens, the supply connection
is on the secondary side of the 480V
transformer, terminal X4 (wire # 79).
The measured voltage should be 240 volts.
5. If input voltage is correct on the load side of
SSR terminal 1, proceed to step 6.
A. If input voltage is not correct, find the
source of the problem.
6. Check output voltage on the load side of SSR
terminal 2.
A. If voltage is correct, SSR is functioning
properly.
B. If no voltage is present on the load side of
SSR terminal 2, the SSR is not functioning
properly.
7. Turn the power switch OFF.
8. Replace the SSR and check for proper
operation.
COMPUTER CONTROL
TEMPERATURE CALIBRATION
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Turn the power switch ON.
A. If the set point temperature is 350°F,
proceed to step 4.
B. If the set point temperature is other than
350°F, proceed to step 3 to change the
temperature.
3. Press the set key then temperature key to enter
the temperature set mode.
A. The display will alternate between the term
"StPt" (set point) and the current oven
temperature setting.
B. Press the up or down arrow keys to make
the proper selection.
C. Press the set key again to save the change
and exit the temperature set mode.
4. Allow the oven temperature to stabilize
(normally 3 cycles).
5. Compare the controls set point temperature to
the thermocouple meter reading when the heat
light goes out.
A. A temperature variance more than 5°F
indicates an adjustment is needed.
1) To make the adjustment, proceed to
step 6.
2) If temperature variance is less than
5°F, computer control is functioning
properly.
6. Enter the setup mode as outlined in SETUP
MODE under COMPUTER CONTROL.
A. Advance through the menu until CAL1
(Calibration Offset) appears.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (Rev. A, October 2007)Page 27 of 60
1) If the thermocouple reading is higher
than set point temperature, press the
down arrow key and enter a negative
offset value that is equal to the
number of degrees above the 5°F
tolerance.
2) If the thermocouple reading is lower
than set point temperature, press the
up arrow key and enter a positive
offset value that is equal to the
number of degrees below the 5°F
tolerance.
3) Exit the setup mode.
7. Allow the oven to cycle at least two times
between adjustments.
A. If the temperature variance still differs
more than 5°F from the set point, verify the
correct calibration offset value was entered
and retained.
1) Adjust the calibration offset value as
outlined in step 6, until the cycling
temperature is within tolerance.
B. If the above adjustment cannot be
obtained:
C. Turn the power switch OFF.
D. Replace the computer control and check
for proper operation.
COMPUTER CONTROL
OPERATIONAL TEST
The computer controls "Calibration Mode" is used to
manually test:
• Outputs of the control
• Keypad functionality
• Verify display and LEDs functionality
Additionally, if a problem is encountered during the
output test, a "Restore Factory Settings" option is
available.
The calibration mode contains several
adjustable parameters that must not be changed.
For the "CALY" (Calibration) Parameter, the
default data option selected must be "no".
Listed below are the parameters and data you
should find in the calibration Mode.
MENU
ALTERNATING ON
DISPLAY
PARAMETER DATA
Calibrate (must
display no)CALY no
Logic Output Test
(see step 3)
LgOt*
*g displays as a 9 0
Logic Inputs "LI"
(Factory Only) LI 21
Keyboard (see
step 4) HEY 0
Display Test (All
segments of
display and the
LED’s are tested )
---
sequence
of
characters
in display
window
Exit Calibration
Mode and return
to Operation
Mode
Set point temperature is
displayed or if call for heat,
dashes (----) displayed.
NOTE: While in the calibration mode, on all
parameters except the Logic Output Test (LgOt), the
control outputs will be OFF.
• To change the programmed data, use the arrow
keys.
• To select the next parameter, press the Rack 1
key.
• At the end of the test, the control automatically
exits the Calibration Mode and returns to the
Operation Mode.
• After 1 minute of no key activations, the control
will return to operation mode.
5. Use this key sequence to access the calibration
mode.
Up arrow; Down arrow; Rack 1; Down arrow;
Temperature; Rack 1
6. Once in the calibration mode the display will
alternate between the parameter and
programmed data. The computer control
outputs are turned OFF.
A. Convection fan stops.
B. Heating stops.
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F25105 (Rev. A, October 2007) Page 28 of 60
NOTE: If the control was calling for heat when
the calibration mode was entered, heating will
resume after exiting the test mode.
7. Press the Rack 1 key to accept the default "no"
under the "CALY" (calibrate) parameter and
advance the display menu to the "LgOt" (logic
output) test. In this mode, the control and logic
outputs can be turned ON for testing only.
A. Use the arrow keys to change the display
to the appropriate number for testing. Each
test starts automatically, several seconds
after number is selected.
1) #0 - All control outputs are OFF
(fan & heat OFF).
#1 - Heat comes ON
(2CON is energized).
#5 - Convection fan comes ON
(High or Low speed SSR is
energized).
#8 - Electronic beeper (external)
sounds.
B. If the output tests are completed
successfully, proceed to step 4.
C. If the output tests are not completed
successfully, find the source of the
problem. If the problem cannot be repaired,
replace the component and check for
proper operation.
8. Press the Rack 1 key twice to advance past the
"LI" (Logic Inputs test) and reach the "HEY"
(keyboard) test.
A. Press the desired key to display the
corresponding hexadecimal code. This
code is used internally by the control to
identify the key being pressed. See table
below.
KEY CODE KEY CODE
Up Arrow 40 Start/Stop 4
Down Arrow 80 Temp 20
1/2 menu 800 Rack 1 10*
3/4 menu 4000 Rack 2 400
5/6 menu 2 Rack 3 2000
Set 200 Rack 4 1
Time 1000 Rack 5 8
Cook & Hold 8000
*displays 10 momentarily then alternates
between Hey and 0. If pressed again, advances
to the next test.
B. If the code displayed is not correct for the
key pressed, then the keyboard is
malfunctioning.
1) Turn the power switch OFF.
C. Replace the computer control and check
for proper operation.
9. Press the Rack 1 key to advance the display
menu to the "dISP" (display) test. A test
sequence automatically runs on the display and
control LEDs for a visual verification that all
segments in the LED display and the internal
LEDs are functioning.
10. At the end of the test, the control exits the
calibration mode and returns to the Operation
Mode.
Restore Factory Settings
NOTE: If the computer control does not appear to be
functioning properly, do not restore factory settings
until verifying the control is configured properly as
outlined in SETUP MODE under COMPUTER
CONTROL and performing the COMPUTER
CONTROL OPERATIONAL TEST as outlined in the
above section.
1. Enter the "Calibration Mode" by using the key
sequence stated in step 1 under COMPUTER
CONTROL OPERATIONAL TEST.
A. The computer control outputs are turned
OFF.
B. The display will alternate between "CALY"
and "no".
2. Press the up or down arrow key until the "rESt"
parameter displays.
3. Press the Rack 1 key and "no" displays.
4. Press the up or down arrow key to change the
display to "YES".
5. Press the Rack 1 key to select this data option
and then advance the menu to the "LgOt" (logic
output test).
NOTE: The "g" in LgOt displays as a "9".
6. Press the Rack 1 key twice to advance past the
"LI" (Logic Inputs test) and the "HEY"
(keyboard) test.
7. The "dISP" (display) test sequence
automatically runs.
8. At the end of the test, the control exits the
calibration mode and returns to the Operation
Mode.
9. Enter the "SETUP MODE" as outlined under
COMPUTER CONTROL and perform the
procedure.
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F25105 (Rev. A, October 2007)Page 29 of 60
ELECTRICAL OPERATION
COMPONENT FUNCTION
Power Switch (S1) ............. Determines the mode of operation; ON, OFF, or COOL DOWN.
Oven Light Switch (S2) ......... Controls the oven cavity lights.
Fan Speed Switch (S3).......... Controls blower motor speed between High and Low settings (VC4ES/6ES
and VC4ED/6ED only).
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 (VC4ES/6ES and VC4ED/6ED only).
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 (T1)............... Provides 24VAC power to the Computer Control (VC4EC/6EC only).
Transformer (T2)............... Provides 240VAC power to the oven control circuit and blower motor
(480VAC models only).
Solid State temperature
Control....................... Monitors temperature sensor and regulates the oven cavity temperature by
controlling 2CON to energize the heating elements when the control calls
for heat.
High Limit Thermostat .......... Protects the oven from temperatures above 550°F by removing power from
the heating circuit. Auto resets at 500°F.
Computer Control.............. Monitors temperature sensor and regulates the oven cavity temperature by
controlling 2CON to energize the heating elements when the control calls
for heat. Also, counts the "Cook" time (normal cooking) of the product and
signals the electronic alarm at the end of the cycle. If "Cook" & "Hold" mode
is selected, when the "Cook" (then hold) time expires, the oven heating
stops and the oven enters "Hold" mode. Once the oven cavity temperature
drops to 150°F, the heat comes back on and the oven cycles at this
temperature to hold the cooked product. Cook & Hold is standard on
computer models. The selected mode also determines the fixed blower
speed of High for "Cook" and Low for "Cook & Hold".
SSR1 & SSR2 ................. When SSR1 is energized by computer control, connects power to blower
motor for High fan speed operation in normal "Cook" mode. In "Cook &
Hold" Mode only, SSR1 is de-energized and SSR2 is energized by
computer control and connects power to blower motor for Low fan speed
operation (VC4EC/6EC only).
1CON & 2CON................. Provides power to heating elements when both are energized. 1CON is
energized when power switch is turned ON. 2CON 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.
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Temperature Probe ............ Senses the oven temperature for the solid state temperature control or the
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.
On oven models using the computer control, the probe is a "J" type
thermocouple.
Mechanical Temperature Control
KX thermostat................. Regulates the oven cavity temperature by controlling 2CON to energize the
heating elements when the control calls for heat (VC4ES/6ES only).
Cooling Fan................... Circulates cooler air from outside the oven to cool components in the
control area.
Fuses ........................ Protect control circuit.
COMPONENT LOCATION
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VC4ES/6ES with Mechanical KX thermostat - Plug, Socket and Components
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VC4ED/6ED with Solid State Control - Plug, Socket and Components
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VC4EC/6EC - Plug, Socket and Components (Cook & Hold Standard)
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F25105 (Rev. A, October 2007) Page 34 of 60
SEQUENCE OF OPERATION
VC4ES, VC6ES with Mechanical KX Thermostat
Schematic diagram 6532 will be used to explain the
electrical 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.
E. Oven doors closed (door switch contacts
CLOSED).
F. Oven cavity temperature below 140°F.
2. Power switch (S1) turned ON.
A. Power ON light (Amber) comes ON.
B. 1CON coil energized.
C. Blower motor energized.
NOTE: Motor speed (Hi/Low) depends on
position of fan speed switch (S3).
D. Component cooling fan energized.
E. Power to oven cavity light switch (S3) wire
#1. Turns cavity lights ON/OFF and does
not affect "Cook" cycle.
3. Set thermostat to desired "Cook" temperature
and thermostat CLOSES.
A. Heating light (Clear) comes ON.
B. 2CON coil energized.
1) Heating elements powered and
heating starts.
4. Oven reaches set temperature and thermostat
OPENS.
A. Heat light goes out.
B. 2CON coil de-energized.
1) Power removed from heating
elements and heating stops.
5. The oven will continue to cycle on the
thermostat until the doors are opened or the
power switch (S1) is turned to the OFF or
COOL DOWN position.
VC4ED, VC6ED with Solid State Temperature
Control
Schematic diagram 6534 will be used to explain the
electrical 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.
E. Oven doors closed (door switch contacts
CLOSED).
F. Oven cavity temperature below 140°F.
2. Power switch (S1) turned ON.
A. Power ON light (Amber) comes ON.
B. 1CON coil energized.
C. Solid state temperature control energized.
1) Heating light (Clear) comes ON.
2) 2CON coil energized.
a. Heating elements powered and
heating starts.
D. Blower motor energized.
NOTE: Motor speed (Hi/Low) depends on
position of fan speed switch (S3).
E. Component cooling fan energized.
F. 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) 2CON 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.
Timer Cycle, Cooking
(KX Thermostat or Solid State Control)
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.
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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.
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
(KX Thermostat or Solid State Control)
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 (S3) set to "Hi".
2. Power Switch (S1) turned to COOL DOWN.
A. Power ON light (Amber) goes out.
B. Convection fan motor energized.
NOTE: Fan speed switch (S3) can be set
to operate at high or low fan speed.
3. If doors are CLOSED (door switch contacts
CLOSED):
A. Power ON light (Amber) comes ON.
B. 1CON coil is energized but heating
elements are not powered.
C. Component cooling fan energized.
D. 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) is turned to the OFF or ON
position.
VC4EC, VC6EC (Computer Control)
Schematic diagram 6536 will be used to explain the
electrical sequence of operation or both the "Cook"
cycle and the "Cook and Hold" cycle.
Cook Cycle
1. Conditions.
A. Oven connected to correct voltage and is
properly grounded.
B. Power switch (S1) OFF.
C. Computer control is setup properly and
ready to use.
NOTE: The set point temperature of the
computer control will be the last
temperature that was set.
D. High limit thermostat CLOSED.
E. Oven doors closed (door switch contacts
CLOSED).
F. Oven cavity temperature below 140°F.
2. Power switch (S1) turned ON.
A. 1CON coil energized.
B. 24VAC transformer (T1) is energized.
1) Computer control is energized and
performs a power ON self test before
energizing outputs. If the control
passes self test, then the outputs are
energized and operation sequence
continues. If control does not pass self
test then the corresponding error code
is displayed.
C. Component cooling fan energized.
D. Power is connected to:
1) Terminal 1 on solid state relay 1
(SSR1 - load side) and solid state
relay 2 (SSR2 - load side).
2) Pin 3 (C3-3) on computer control
(input "IN-2").
3) Oven cavity light switch (S2). Turns
cavity lights ON/OFF; does not affect
"Cook" cycle.
3. Computer control senses oven cavity
temperature through probe input. With the oven
cavity temperature below set point, the output
from pin C3-2 is activated.
A. Oven "Heat Light" on the control comes
ON.
B. 2CON coil energized.
1) Heating elements powered and
heating starts.
C. The controls 5VDC output from pins C2-2
(-) and C2-8 (+) is activated and SSR1
relay is energized.
1) Convection fan motor is energized
(High speed).
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4. Oven reaches set point temperature.
A. Computer control de-activates the output
from pin C3-2.
1) 2CON coil de-energized.
a. Power removed from heating
elements and heating stops.
B. Oven "Heat Light" on the control goes out.
C. Oven "Ready Light" on the control comes
ON.
D. Electronic beeper sounds momentarily.
5. The oven will continue to cycle on the computer
control until the doors are opened or power
switch (S1) is turned to the OFF or COOL
DOWN position.
Temperature and Time Cycle (Cooking)
NOTE: The computers internal "Cook" timer
operates independently of the heating cycle.
Additional time can be set or the timer can be
stopped and re-started throughout the cooking cycle.
Refer to the Instructions Manual for specific
operating instructions of the oven Computer Control.
Cook and Hold Cycle
NOTE: For a detailed explanation of the "Cook &
Hold" mode, refer to the Instructions Manual as
outlined under SETTING THE OVEN FOR COOK &
HOLD and COOK & HOLD OPERATION.
In "Cook & Hold" mode, the operation of the
computer control is identical to the normal Cook
Cycle with these exceptions:
1. Oven "Cook & Hold" light on the control comes
ON.
2. Convection fan will operate at Low speed,
throughout the "Cook & Hold" cycle.
A. The computer control 5VDC output from
pins C2-2 (-) and C2-8 (+) is de-activated
and SSR1 relay is de-energized.
1) Power is removed from convection fan
motor high speed terminal.
B. The computer control 5VDC output from
pins C2-1 (-) and C2-8 (+) is activated and
SSR2 relay is energized.
1) Power is applied to the convection fan
motor low speed terminal.
3. At the end of the "Cook" time, the electronic
beeper sounds momentarily to indicate the end
of first stage cooking (oven operates normally at
the temperature and time selected until time
expires).
4. The display flashes HOLD as the oven enters
HOLD mode. This is also considered second
stage cooking (oven heating stops but product
continues to cook on residual heat).
A. Convection fan motor is de-energized.
5. After the oven temperature drops below 150°F,
the heat comes back ON and cycles as needed,
to maintain the "Hold" temperature of 150°F.
A. Convection fan motor energized (Low
speed).
6. The oven continues to cycle in this manner until
one of the following occurs:
A. The "Cook & Hold" mode is turned OFF.
B. Power switch (S1) is turned to the OFF or
COOL DOWN position.
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. Power switch (S1) set to either ON or OFF.
2. Power Switch (S1) turned to COOL DOWN.
A. Power is connected through power switch
(S1) to the convection fan motor high
speed terminal.
1) Convection fan motor energized (High
speed).
3. The oven will continue to operate in COOL
DOWN mode until the power switch (S1) is
turned to the OFF or ON position.
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SCHEMATICS VC4ES, VC6ES with Mechanical (KX) Controls, 208-240V
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F25105 (Rev. A, October 2007) Page 38 of 60
VC4ES, VC6ES with Mechanical (KX) Controls, 480V
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F25105 (Rev. A, October 2007)Page 39 of 60
VC4ED, VC6ED with Solid State Temperature Control, 208-240V
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F25105 (Rev. A, October 2007) Page 40 of 60
VC4ED, VC6ED with Solid State Temperature Control, 480V
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F25105 (Rev. A, October 2007)Page 41 of 60
VC4EC, VC6EC Computer Control, 208-240V (Roast & Hold Standard)
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F25105 (Rev. A, October 2007) Page 42 of 60
VC4EC, VC6EC Computer Control, 480V (Roast & Hold Standard)
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WIRING DIAGRAMS VC4ES, VC6ES with Mechanical (KX) Control, 208-240V
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VC4ES, VC6ES with Mechanical (KX) Control, 480V
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F25105 (Rev. A, October 2007)Page 47 of 60
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VC4ED, VC6ED with Solid State Temperature Control, 208-240V
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VC4ED, VC6ED with Solid State Temperature Control, 480V
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VC4EC, VC6EC Computer Control, 208-240V (Roast & Hold Standard)
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F25105 (Rev. A, October 2007)Page 53 of 60
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VC4EC, VC6EC Computer Control, 480V (Roast & Hold Standard)
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TROUBLESHOOTING
Certain procedures in this section require electrical test or measurements while power is
applied to the machine. Exercise extreme caution at all times. If test points are not easily accessible,
disconnect power and follow lockout / tagout procedures, attach test equipment and reapply power to
test.
ALL MODELS
SYMPTOMS POSSIBLE CAUSES
Blower motor doesn’t run with power switch in "ON"
"COOL DOWN" or position.
1. Line voltage incorrect.
2. Power switch (S1) malfunction.
3. Fan speed switch (S3) malfunction.
4. Interconnecting wiring malfunction.
5. Motor inoperative.
Blower motor doesn’t run with power switch "ON", but
oven heats.
1. Door switch malfunction.
2. Interconnecting wiring malfunction.
3. Motor inoperative.
Blower motor doesn’t run in "Cool Down", but runs ok
in "ON" position.
1. Power switch (S1) malfunction.
2. Fan speed switch (S3) malfunction.
3. Interconnecting wiring malfunction.
Excessive or low heat in oven. 1. Line voltage incorrect.
2. Heating element malfunction.
3. Contactor malfunction.
4. Convection Fan motor malfunction.
5. Temperature probe malfunction or mechanical
thermostat malfunction.
6. Temperature control not calibrated.
7. Temperature control malfunction.
Mechanical Timer inoperative or not functioning
properly.
1. Interconnecting wiring malfunction.
2. Line voltage incorrect.
3. Timer malfunction.
Component cooling Fan does not run. 1. Motor inoperable.
2. Interconnecting wiring malfunction.
Uneven Cooking. 1. Convection Fan motor speed/direction.
2. Air flow Baffles missing or damaged.
3. Line voltage incorrect.
4. Heating element(s) malfunction.
5. Contactor malfunction.
Intermittent operation problems. 1. High ambient temperatures.
2. Wiring connections loose.
3. Cooling fan malfunction.
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SYMPTOMS POSSIBLE CAUSES
F25105 (Rev. A, October 2007)Page 57 of 60
No power to oven controls. 1. Main circuit breaker OPEN.
2. Control circuit fuses OPEN.
3. Power switch (S1) inoperative.
4. Transformer (T2) inoperative (480V only).
No heat, convection fan motor runs. 1. High limit thermostat OPEN.
2. Heating element malfunction.
3. Contactor malfunction.
4. Temperature control malfunction.
No power to temperature control. 1. Power switch (S1) in "Cool Down".
2. Door or door switch open.
Door does not seal or shut properly 1. Doors out of adjustment.
2. Door chain out of adjustment or broken
(simultaneous doors).
3. Door catch roller out of adjustment or broken
(independent doors).
4. Door seals damaged.
COMPUTER CONTROL MODELS ONLY
SYMPTOM POSSIBLE CAUSES
Oven does not heat. 1. High limit switch open.
2. Temperature probe malfunction.
3. Computer control malfunction.
High limit thermostat shutting OFF heat. 1. Temperature probe malfunction.
2. Computer control malfunction.
Oven not hot enough. 1. Temperature probe malfunction.
2. Computer control range high (rH1) setting to low. See
SETUP MODE under COMPUTER CONTROL.
3. Computer control malfunction.
Blower motor doesn’t run with power
switch in "ON" or "COOL DOWN" position.
1. Line voltage incorrect.
2. Power switch (S1) malfunction.
3. Fan speed switch (S3) malfunction.
4. Solid sate relay (SSR) malfunction. See SOLID STATE
RELAY TEST under COMPUTER CONTROL.
5. Interconnecting wiring malfunction.
6. Motor inoperative.
7. Computer control malfunction. See COMPUTER CONTROL
OPERATIONAL TEST.
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Error Codes
In the display window, the error code will alternate between the code and the oven cavity temperature or dashes if
the oven is calling for heat (heat light on). The exact error code displayed will depend on the priority assigned to
the problem in the EPROM'S software. The lower the error code number, the higher the priority. If more than one
problem occurs at the same time, the error code assigned to the higher priority problem will be displayed. Refer to
the error code table below to solve the problem. If the lower priority problem still exists, the next error code will be
displayed. When the condition causing the error is resolved, normal oven operation can resume.
NOTE: To check a "Setup Parameter" and its corresponding "Data Value", see SETUP MODE under COMPUTER
CONTROL.
NOTE: If the cause of the error is not apparent, check for these conditions as they may also cause errors to occur:
Electrical noise or a noise event, excess environmental moisture or temperature, or vibration.
CODE & PROBLEM PROBABLE CAUSE SOLUTION
Er01 - ROM checksum error Internal ROM malfunction Cycle power
Er02 - RAM checksum error Internal RAM malfunction Cycle power
Er03 - Ambient sensor error Ambient temperature is below 32EF Check ambient temperature at the
control.
Er04 - Configuration error Microprocessor malfunction Cycle power
Er05 - EPROM error 1Power loss while storing data Cycle power
Er06 - Zone 1 A/D underflow error • Incorrect sensor type
• Measuring temperature outside
the sensor range
• Check the InP1 setup parameter.
Verify it matches your sensor.
• Check sensor and connections
for a reversed or open sensor. If
the condition causing the error is
resolved, the error will clear.
Er07 - Zone 1 A/D overflow error Open sensor • Check the InP1 setup parameter.
Verify it matches your sensor.
• Check sensor and connections
for a reversed or open sensor. If
the condition causing the error is
resolved, the error will clear.
Er10 - Stack overflow error Microprocessor malfunction • Cycle power
• Check sensor and connections
for a reversed or open sensor
Er11 - Open sensor error Open sensor • Check the InP1 setup parameter.
Verify it matches your sensor.
• Check sensor and connections
for a reversed or open sensor
Er12 - Shorted sensor • Incorrect sensor type
• Measuring temperature outside
the sensor range
• Check the InP1 setup parameter.
Verify it matches your sensor.
• Check sensor and connections
for a reversed or open sensor
NOTE: 1. Should only see when a new EPROM is installed and powered for the first time.
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- N O T E S -
FULL SIZE ELECTRIC CONVECTION OVENS
F25105 (Rev. A, October 2007) Printed in U.S.A.
