Vulcan-Hart VC6ED, VC4ES, VC4ED, VC6EC, VCIEC User Manual
...
SERVICE MANUAL
VC4E & VC6E
SERIES
FULL SIZE
ELECTRIC CONVECTION
OVENS
MODEL ML
VC4ES 126743
VC4ED 126744
VC4EC 126745
VC6ES 126746
VC4ED SHOWN
- NOTICE -
This Manual is prepared for the use of train ed Vulcan Service
Technicians and should not be used by those not properly
qualif ied. If you have att ended a Vu lcan Service School for this
product, you may be qualified to perform all the procedures
described in this man ual.
Thi s manu al i s no t i nten ded to be al l en comp assi ng . I f you have
not attende d a Vulcan S ervic e School for this produc t, you sho uld
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 th e necessary tools, instruments and skills should be
performed b y a trained Vu lcan Service Technician .
VC6ED 126747
VC6EC 126748
Reproduction or other use of this Manual, without the express
written consent of Vulcan, is prohibited
A product of VULCAN-HART LOUISVILLE , KY 40201-0696
.
F25105 (Decem ber 2001)
FULL SIZE ELECTRIC CONVECTION OVENS
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
Temperat ure Probe (Solid State Control) .................................................. 8
Heating Elements ................................................................... 9
Blower And Motor .................................................................. 10
Door Switch ....................................................................... 11
Door W indow ...................................................................... 12
Ov en Door s and Bear ings (Independent Doors) ............................................ 12
Ov en Door s (S imultaneous Doors) ...................................................... 13
Door Catch Roller Assembly (Independent Doors) .......................................... 14
Mechanical (KX) Thermostat .......................................................... 14
High Limit Thermostat ............................................................... 15
Interior Lights...................................................................... 15
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
Temperat ure Probe Test (Sol id State Contr ol) ............................................. 20
Heating Element Test ............................................................... 20
Blower Adjustment.................................................................. 21
Door Adjustment ................................................................... 22
Door Catch Roller Adjustment (Independent Doors) ......................................... 22
Door Switch Adjustment.............................................................. 23
Door Chain Adjustment (Simultaneous Doors) ............................................. 23
Computer Control .................................................................. 24
Computer Control Temperature Calibration ............................................... 26
Computer Cont rol Operational Test ..................................................... 26
ELECTRICAL OPERATION .............................................................. 29
Component Func tion ................................................................ 29
Component Locat ion ................................................................ 30
Sequence of O per ation .............................................................. 34
VC4ES, VC6ES wi th Mechanical K X Ther mostat ....................................... 34
VC4ED, VC6ED with Solid State Temperature Control................................... 34
Timer Cycle, Cooking (KX Thermostat or Solid State Control) ............................. 35
Cool Down Cycle (KX Thermostat or Solid State Control)................................. 35
VC4EC, VC6EC (Computer Control) ................................................ 35
Temperat ure and Tim e Cy c le (Cooking) .......................................... 36
Cook and Hold Cycl e ........................................................ 36
Cool Down Cycle ........................................................... 36
Schematics ....................................................................... 37
VC4ES, VC6ES wi th Mechanical ( K X) Cont r ols, 208-240V ................................ 37
VC4ES, VC6ES wi th Mechanical ( K X) Cont r ols, 480V ................................... 38
VC4ED, VC6ED wit h S olid Stat e Temperature Control, 208-240V .......................... 39
VC4ED, VC6ED wit h S olid Stat e Temperature Control, 480V .............................. 40
F25105 (Decem ber 2001) Page 2 of 60
FULL SIZE ELECTRIC CONVECTION OVENS
VC4EC, VC6EC Computer Control, 208-240V (Roast & Hol d S tandard) ...................... 41
VC4EC, VC6EC Computer Control, 480V (Roast & Hold S tandard) ......................... 42
Wiring Diagrams ................................................................... 44
VC4ES, VC6ES wi th Mechanical ( K X) Cont r ol, 208-240V ................................. 44
VC4ES, VC6ES wi th Mechanical ( K X) Cont r ol, 480V .................................... 46
VC4ED, VC6ED wit h S olid Stat e Temperature Control, 208-240V .......................... 48
VC4ED, VC6ED wit h S olid Stat e Temperature Control, 480V .............................. 50
VC4EC, VC6EC Computer Control, 208-240V (Roast & Hol d S tandard) ...................... 52
VC4EC, VC6EC Computer Control, 480V (Roast & Hold S tandard) ......................... 54
TROUBLESHOOTING .................................................................. 56
All Models ........................................................................ 56
Computer Cont rol Models Only ........................................................ 57
CONDENSED SPARE PARTS LIST ........................................................ 60
© Vulcan 2001
F25105 (Decem ber 2001)Page 3 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
GENERAL
INTRODUCTION
Procedures in this manual will apply to all models unless specified. Pictur es and illustrations can be of any model
unless the picture or illustration needs to be model specific.
Models
FEATURES OPTIONS
MODEL
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
NOTES
4
4
:
CAVITY
DEPTH
26.5" Mechanical (KX) Independent
26.5" Solid State Independent
26.5" Computer Independent
30.5" Mechanical (KX) Independent
30.5" Solid State Independent
30.5" Computer Independent
1. Sim ultaneous 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.
TEMPERATURE
CONTRO L
DOORS
(50/50)
TIMER
1, 2
1-Hour Dial 5-Hour Dial N/A
1, 3
1-Hour Dial 5-Hour Dial N/A
1, 3
24-Hour Digital Built in Built in
1, 2
1-Hour Dial 5-Hour Dial N/A
1, 3
1-Hour Dial 5-Hour Dial N/A
1, 3
24-Hour Digital Built in Built in
COOK
COOK
TIMER
COOK &
HOLD
INSTALLATION
Refer to the Instructions Manual for detailed
installation instr uc tions on single or stacked ovens.
OPERATION
Refer to the Instructions Manual for specific
operating i nst r uc tions.
CLEANING
Refer to the Instructions Manual for specific
cleaning instructions.
LUBRICATION
Cavity blower m otor has sealed bearings and
requires no addit ional lubrication.
Huskey’s TF1000 grease or equivalent high
temperat ure Teflon grease.
TOOLS
Standard
Standard set of hand tools
VOM with A. C. current tester ( A ny quality VOM
with a sensitivit y of at least 20,000 ohms per volt
can be used)
Gear Puller to rem ove blower
Temperat ure tester (thermocouple type)
Special
Manometer
Clamp on amp meter
Spring force gauge, pull type with a minimum 30
pound full scale range (purchase l oc ally)
RTV sealant, 736 DOW silicone high t emp
(P/N 542133) or equivalent
F25105 (Decem ber 2001) Page 4 of 60
Electrical
FULL SIZE ELECTRIC CONVECTION OVEN - GENERAL
SPECIFICATIONS
AMPERAGE - 3 PHASE/ 60HZ
MODEL
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
NOTES:
MODEL
TOTAL
POWER
(KW)
PER LINE
1
RECOMMENDED
CIRCUIT
PROTECTION
2
208V 240V 480V 208V 240V 480V
12.5 353315454020
1. Amperage values in the table are nominal.
Tolerance is +5/-10%.
2. Complied in accordance wi th National E lectric Code,
ANSI/NFPA 70, latest edition.
AMPERAGE - 1 PHASE/ 60HZ
TOTAL
POWER
(KW)
PER LINE
1
RECOMMENDED
CIRCUIT
PROTECTION
2
VC4ES
VC4ED
VC4EC
VC6ES
VC6ED
VC6EC
NOTES:
208V 240V 480V 208V 240V 480V
12.5 605226807035
1. Amperage values in the table are nominal.
Tolerance is +5/-10%.
2. Complied in accordance wi th National E lectric Code,
ANSI/NFPA 70, latest edition.
F25105 (Decem ber 2001)Page 5 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
Top Front Cover
1. The top f r ont cover is secured with four ( 4)
screws, two on each side of cover. Rem ove
these screws then remove the cover from the
oven.
2. Reverse the procedure to install.
Bottom Front Cover
1. The bottom front c over i s secured wit h four (4)
screws, two on each side of cover. Rem ove
these screws then remove the cover from the
oven.
DISCONNECT THE ELECTRICAL
NOTE:
thermostat, it must be removed fr om the control
panel first, bef ore removing the control panel.
2. Disconnect the temperature pr obe leads from
3. Unplug the wire harness connector to the
4. Reverse the procedure to install.
Right Side Panel
1. Remove the two screws near front of ov en,
2. Remove the remaining sev en scr ews securing
If t he oven has a mechanical (KX ty pe)
the solid stat e temperature c ontrol.
control panel components.
which secure the bottom front cover and c ontrol
panel.
the right side panel.
2. Reverse the procedure to install.
Control Panel
1. Remove three (3) screws on the right side
which secure the control panel then pul l the
panel away from the oven.
F25105 (Decem ber 2001) Page 6 of 60
3. Pull t he right side panel out at the bottom then
4. Reverse the procedure to install.
down to remove.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
Left Side Panel
1. Remove the screws which secure the left side
of the t op front cover, bot tom f r ont cover and
control panel.
2. Remove the seven screws securing t he left
side panel.
3. Pull t he left side panel out at the bottom then
down to remove.
4. Reverse the procedure to install.
CONTROL PANEL
COMPONENTS
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
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 operati on.
DISCONNECT THE ELECTRICAL
F25105 (Decem ber 2001)Page 7 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
COMPONENT PANEL
COMPONENTS
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
Removable Components
1. Remove the right side panel as outli ned under
"COVERS AND PANELS".
NOTE:
component can be servic ed by r emov ing the control
panel as outli ned under "COVERS AND PA NE LS " .
2. Disconnect the wir e leads to the component
being replaced.
3. Remove the component.
4. Reverse the procedure to install the
replacement component and check oven for
proper operati on.
DISCONNECT THE ELECTRICAL
If right side panel is not accessible, t his
TEMPERATURE PROBE
(SOLID STATE CONTROL)
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the right side panel as outli ned under
"COVERS AND PANELS".
NOTE:
component can be servic ed by r emov ing the control
panel as outli ned under "COVERS AND PA NE LS " .
2. Disconnect the pr obe leads from the solid state
temperat ure control.
3. Remove the racks and ri ght rack support.
4. Remove the probe guard or mounting clips.
DISCONNECT THE ELECTRICAL
If right side panel is not accessible, t his
F25105 (Decem ber 2001) Page 8 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
5. Remove probe by pushing it through the oven
wall and int o the control panel area.
A. Measure the current draw of the heating
element s as outlined under "HEAT ING
ELEMENT TEST" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
4. From inside the oven cavity, remove the
perforat ed panel from the same side of the
element being replaced.
NOTE:
line up straight with the oven cavity outer shell,
therefor e the probe must be removed at an angle.
6. Reverse the procedure to install the
7. Adjust the temperature control as outlined
The hole in the oven cavity wall does not
replacement probe.
under "SOLID STATE TEMP E RA TURE
CONTROL CALI B RA TION" in " S E RV ICE
PROCEDURES AND ADJUSTMENTS".
HEATING ELEMENTS
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
NOTE:
the top cavity panel will have 3/4" square holes for
easier element removal. Ovens m anufactured prior
to this date have 1/2" r ound holes that sometimes
make it difficult to remove elements thru the cavity.
A serial number cut off will not
the procedures f or element remov al as outlined
below.
DISCONNECT THE ELECTRICAL
Starti ng wi th production in October, 2001,
be available. Follow
A. If r emov ing the right side panel, also
remove the probe guard or mounting clips.
B. Run the probe wire t hr u the panel opening
before l ifting panel out.
5. From t he element being replaced, r emov e the
hold down clam ps, the mounti ng br ac k et
screws at the top, then remove the element .
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
element locations from front to back are: Right
side - R1, R2 & R3; Left side - R4, R5 & R6.
or right si de in the oven cavity. The
F25105 (Decem ber 2001)Page 9 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
LEFT SIDE ELEMENTS SHOWN
NOTE:
which may still hold the element after the screws are
removed. Also, in some cases, the ri ng terminal
connected to the element may interfere with easy
removal. I f access to the l eft side panel and/or the
top panel is available, see "ALTERNATE ACCESS".
6. Disconnect the lead wires from the elem ent.
7. Clean RTV residue from the mati ng surface
The mounting bracket i s sealed with RTV
inside the oven, apply new hi gh temperature
RTV to the heat ing element mounti ng bracket
and rever se proc edur e to install .
3. If t he element is on the right
A. Remove the top panel and pull back the
insulation to expose the el ement
terminals.
B. Remove the lead wires from the element
being replaced.
4. From t he same element, remove the two
clamps holding the element vertical, the
screw’s securing mounting brac k et at the top,
and then remove the el ement.
NOTE:
which may still hold the element after the screws are
removed.
5. Clean RTV residue from the mati ng surface
6. Check for proper operation.
The mounting bracket i s sealed with RTV
inside the oven, apply new hi gh temperature
RTV to the heat ing element mounti ng bracket
and rever se proc edur e to install .
side:
BLOWER AND MOTOR
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Take out the racks and rack supports.
2. Remove screws securing baffle panel and
remove the panel.
DISCONNECT THE ELECTRICAL
8. Check for proper operation.
Alternate Access
If t he heating element is not
inside the oven cavity, and ac cess to the left side
panel and/or the top panel is available, this al ternate
removal m ethod may be used.
NOTE:
being serv iced and the heating element to replace is
on the right side, the ovens must be unstacked to
access the heating el ement terminals through the
top. Once unstacked, fol low the removal procedur e
below.
1. Perform steps 1 thru 4 under "FRONT
2. If t he element is on the left
On stacked ovens, if the bottom oven is
ACCESS".
A. Remove the left side panel and pull back
the insulation at the top t o expose the
element terminals.
B. Remove the lead wires from the element
being replaced. Proceed to step 4.
removing easily from
side:
3. If replacing:
A. Blower Only
blower hub and using a bearing puller,
remove blower from motor shaft.
- Loosen set screws on
F25105 (Decem ber 2001) Page 10 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
1) Reverse procedure to install and
adjust blower position as outlined
under "BLOWER ADJUST MENT" in
"SERVICE PROCEDURES AND
ADJUSTMENTS".
B. Motor
4. Remove the nuts that secure the motor
mounti ng plate to the rear wall.
- perform step 3A and continue
procedure.
10. Reconnect lead wires at the motor, replace
conduit and j unction box cover.
NOTE:
schematic. The motor must rotate clockwise
viewed from t he shaft end.
Check data plat e on motor for wiring
when
5. Place a piece of cardboard on the bottom of
the ov en c avity to protect its surface from any
damage during motor assembl y r emov al.
6. Pull t he motor assembl y into the oven cavity
and place it on the cardboard.
7. Remove the junct ion box cover f r om the motor,
disconnect l ead wir es and remove the conduit.
8. Remove motor mounting bolts and flat washers
then lift the motor f r om the mounting plate.
9. Position the replacem ent motor on t he motor
mounti ng plate and install mount ing bolts and
washers.
Hand tighten mounting bolts only
11. Slide blower onto motor shaft until hub is flush
with end of shaft then ti ghten set screws.
12. Adjust motor position until blower is parallel to
motor mounting pl ate as outlined under
"BLOWER ADJUSTMENT" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
13. Position motor mounting pl ate on the rear wall
and secure with nuts and washers.
14. Replace t he baffle panel.
15. Remove cardboard from t he bottom of the
oven cavity.
16. Check oven for pr oper operation then replace
rack guides and racks.
DOOR SWITCH
.
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the top front cover as outlined under
"COVERS AND PANELS".
DISCONNECT THE ELECTRICAL
2. Disconnect the lead wires to the door switch.
3. Remove the switch.
F25105 (Decem ber 2001)Page 11 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
4. Reverse proc edur e to install the replacem ent
switch and check for proper adjustment as
outlined under "DOOR SWITCH
ADJUSTMENT " in "SERVICE P ROCEDURES
AND ADJUSTMENTS".
DOOR WINDOW
1) Lift out the inner door panel and
window assembly.
2) If replaci ng window on the right door,
remove the screws along the insi de
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 brack et and lift the window
assembly out from t he door frame.
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the screws at the top and bott om of
door.
2. Independent doors:
A. Remove the door handl e then remove the
B. Lift out the i nner door panel and window
DISCONNECT THE ELECTRICAL
outer door panel.
assembly.
5. Reverse proc edur e to install the replacem ent
window.
OVEN DOORS AND BEARINGS
(INDEPENDENT DOORS)
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the top front cover and bottom front
cover as outlined under "CO V E RS A ND
PANELS".
2. Remove the door switch lever.
DISCONNECT THE ELECTRICAL
NOTE:
the inside edge of the door.
3. Simultaneous doors:
A. If r eplacing window on the left door,
F25105 (Decem ber 2001) Page 12 of 60
Left door only - rem ove door seal from
remove the handle from t he front of the
door then remove door seal from the
inside edge of the door.
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
3. Remove the lower door seal strip to expose the
mounti ng scr ews 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:
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 l ift
6. Lay the door f lat to prevent dam age.
7. The top and bottom bearings are now
The door assembly is heavy and will drop
the door up until the bottom of the door shaft
clears the openi ng in the sill.
accessible for inspection and/or replacement if
needed.
OVEN DOORS
(SIMULTANEOUS DOORS)
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
Assembly Removal
1. Remove the top front cover and bottom front
cover as outlined under "CO V E RS A ND
PANELS".
2. Remove the door switch lever.
DISCONNECT THE ELECTRICAL
A. If bear ings are ok, proceed to step 8.
B. If r eplacing 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 proc edur e to install door assembly
and check for proper adjustment as outlined
under "DOOR ADJ US TMENT" and "DO OR
SWIT CH ADJUSTMENT" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
3. Remove the top beari ng r etainers and top
bearings.
4. Remove the lower door seal strip to expose the
mounti ng scr ews 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.
NOTE:
down once the last screw is removed. If removing
door assembly with- out assistance, use caution.
The door assembly is heavy and will drop
F25105 (Decem ber 2001)Page 13 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
5. Lift up on the door assembly and swing the
right side out then move the assembly to the
left to clear t he slots in the upper door sill.
6. Lay the door assembly on a flat c ushi oned
surface for disassembly.
7. Reverse proc edur e to install door assembly
and check for proper adjustment as outlined
under "DOOR ADJ US TMENT", "DOOR CHAIN
ADJUSTMENT (SIMULTANEOUS DOORS)"
and "DOOR SWITCH A DJ US TMENT" i n
"SERVICE PROCEDURES AND
ADJUSTMENTS".
Disassembly
1. Remove the door assembly as outlined in
"OVEN DOO R S ( S IMULTANEOUS) " 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 fr om the sprocket of
door being repl ac ed.
DOOR CATCH ROLLER
ASSEMBLY
(INDEPENDENT DOORS)
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the top front cover as outlined under
“COVERS AND PANELS”.
2. Remove the catch roller assembly .
DISCONNECT THE ELECTRICAL
5. Remove the door f r om lower sill bearings and
sprocket.
A. Door assembly par ts are now accessible
for i nspection and/or replacement if
necessary.
6. Reverse proc edur e to re-assemble the door
assembly parts and check for proper
adjustment as outlined under "DO OR CHAIN
ADJUSTMENT (SIMULTANEOUS DOORS)" in
"SERVICE PROCEDURES AND
ADJUSTMENTS".
3. Reverse proc edur e to install .
4. Adjust the catch roller as outlined under
“DOOR CATCH (ROLLER) ADJUSTME NT
(INDEPENDENT DOORS)” in “SERVICE
PROCEDURES AND ADJUSTMENTS”.
MECHANICAL (KX)
THERMOSTAT
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the racks and ri ght rack support.
2. Remove the thermostat knob and mount ing
screws from the c ontrol panel and t hen r emov e
the control panel.
3. Remove the probe guard from the oven cavity
wall.
DISCONNECT THE ELECTRICAL
F25105 (Decem ber 2001) Page 14 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
NOTE:
should not ext end beyond the guard.
4. Remove the thermostat bulb from the oven
NOTE:
line up straight with the oven cavity outer shell,
therefor e the probe must be removed at an angle.
5. Reverse the procedure to install.
6. Adjust the thermostat as outl ined under
When installing probe guard, the probe
cavity by pushing it through the oven wall and
into the control panel ar ea.
The hole in the oven cavity wall does not
"MECHANICAL (K X) T HE RM OSTAT
CALIBRATI ON " in "SERVICE PROCEDURES
AND ADJUSTMENTS".
HIGH LIMIT THERMOSTAT
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Take out rack s from the oven.
DISCONNECT THE ELECTRICAL
NOTE:
and mati ng surfaces inside the oven cavity and
apply new high temperature RTV seal er before
installing.
4. Reverse proc edur e to install .
Remove the old RTV seal er from the cover
INTERIOR LIGHTS
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
DISCONNECT THE ELECTRICAL
2. Remove the high l imit thermostat
cover /mounti ng plate fr om inside t he oven
cavity at the top.
3. Disconnect lead wi r es from hi gh limit
thermostat then remove high limit therm ostat
from cover /mounti ng plate.
Lamp
1. Remove the racks.
2. Unscrew the glass lens for the light bei ng
replaced then unscrew the bulb.
3. Replace bulb t hen reverse the pr oc edur e to
install.
Lamp Assembly
1. Remove the lens and bulb.
2. Remove the springs from the ret aining tabs (2
places) on the socket.
F25105 (Decem ber 2001)Page 15 of 60
FULL SIZE ELECTRIC CONVECTION OVEN - REMOVAL AND REPLACEMENT OF PARTS
3. Depress the retaini ng 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 repl ac ement
socket.
6. Insert the socket into the hole in the oven and
push until the sock et is held in place by the
retaini ng tabs.
7. Install the light bulb and lens.
8. Check for proper operation.
COOLING FAN
WARNING:
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the right side panel as outli ned under
"COVERS AND PANELS".
DISCONNECT THE ELECTRICAL
4. Reverse the procedure to install the
replacement fan and check for proper
operation.
NOTE:
from outside the rear of the oven and blown into t he
control ar ea. The arrow on the fan body indicates
“air f low” directi on and shoul d be pointing toward the
controls.
NOTE:
air tube and the oven bott om.
NOTE:
at approximatel y 30 degrees to properly direct the
air f low.
The fan must be installed so air is pulled
Ensure fan is seated “squarely” against the
The air deflector should be angled upwards
NOTE:
component can be servic ed by r emov ing the control
panel as outli ned under "COVERS AND PA NE LS " .
2. Disconnect the lead wires to the f an motor by
3. Remove the screws securing the air deflect or
F25105 (Decem ber 2001) Page 16 of 60
If right side panel is not accessible, t his
removing wire nut s.
to the f an then loosen the tab screw holdi ng the
fan to t he c omponent panel. Rotate the tab so
that the fan will clear and remove the fan.
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
SERVICE PROCEDURES AND ADJUSTMENTS
WARNING:
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 POI NT S ARE NOT EASI LY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST
EQUIPMENT AND REAPPLY POWER TO TEST .
SOLID STATE TEMPERATURE
CONTROL CALIBRATION
1. Place a thermocouple in the geometr ic center
of the oven cavity.
2. Set the power switch to O N.
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 heat ing cycles.
6. Calculat e the differenti al by subtracting the
temperat ure indicat ed when the lamp goes out
from the temper ature indic ated when the lamp
comes on.
A. If the average temperature is 10 °F or
, from the dial setting, t he thermostat
less
is properly c alibrated.
B. If the average temperature is more
than
10 °F from the dial setting, the therm ostat
calibration must
be adjusted.
1) Loosen the tem per ature control k nob
set screw and remove the knob fr om
the stem.
2) Loosen temperature control mounting
screws only enough to rotate t he
control.
a. Place thumb and forefinger on
the head of t he mounting
screws, apply pressure and
slightly rotate the screw heads
(body of control) i n the slot.
Rotate clockwise
to increase
temperat ure and
DifferentialHeat lamp OFFHeat lamp ON
Example
: 360((
lamp off
)340((
lamp on
)20
A. The differential calculated should be less
than 20 °F.
counterclockwise
(
b. Center the stem in the opening
and re-tighten the temper ature
control mounting screws.
to decrease.
1) If the differential is 20 °F or less
, the
temperat ure 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 "TEMPERAT URE
PROBE TEST (SOLID STATE
CONTROL)".
b. If t he pr obe is functioning
properly t hen temperature
control is malfunctioning.
a) Install a replacement
temperat ure control and
check calibration.
7. Calculat e the average temperatur e by adding
the temper ature indic ated when the lamp goes
out to the temperature i ndicated when the lamp
comes on and dividi ng this answer by 2.
[
Temp.(lamp off
)
Example
Temp.(lamp on
: 360
340(÷ 2350
(
)] ÷ 2
Average Temp
(
.
c. Replace knob and re-tighten set
screw .
F25105 (Decem ber 2001)Page 17 of 60
FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
d. Rotate the knob t o the lowest
temperat ure setting then back to
350°F.
e. Repeat the average temper ature
calculation in step 7.
NOTE:
Allow the oven to cycle
at least two times between
adjustment s before perf or ming
the calculation.
a) If the av erage temperat ur e
still differs more
than 10 °F
from the dial setting, adjust
the therm ost at calibration
until the average
temperat ure is within
tolerance.
C. If the above adjustment cannot be
obtained:
1) Turn the power switch O FF.
WARNING:
DISCONNECT THE ELECTRICAL
POWER TO T HE MACHINE AT THE MAIN
CIRCUIT BO X. P LA CE A TAG ON THE CI RCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
2) If the differential is more
than 30 (F,
the therm ost at is malfuncti oning.
a. Install a replacement thermostat
and check calibration.
7. Calculat e the average temperatur e by adding
the temper ature indic ated when the heat lamp
goes out to the temperature indicated when the
heat lam p c omes on and dividing t his answer
by 2.
[
Temp.(lamp off
)
Example
Temp.(lamp on
: 360
340(÷ 2350
(
)] ÷ 2
Average Temp
(
A. If the average temperature is 15 (F or less
from the dial setting, the t hermostat i s
properly calibrated.
B. If the average temperature is more
than
15 (F of t he dial setti ng, the thermostat
calibration must
be adjusted.
1) Remove the thermostat knob.
2) Hold the thermostat shaft and turn the
inner set screw clockwise
temperat ure or countercl oc k wise
to decrease
to
increase temperature (¼ turn =
35(F).
.
2) Replace the temperat ur e c ontrol and
check calibration.
MECHANICAL (KX)
THERMOSTAT CALIBRATION
1. Place a thermocouple in the geometr ic center
of the oven cavity.
2. Set the power switch to O N.
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. Calculat e the differenti al by subtracting the
temperat ure indicat ed when heat lamp goes out
from temperat ure indicat ed when heat lamp
comes on.
DifferentialHeat lamp OFFHeat lamp ON
Example
: 360((
A. The differential calculated should be less
than 30(F.
1) If the differential is 30 °F or less
lamp off
)340((
lamp on
)20
, the
thermostat is funct ioning properl y .
a. Proceed to step 7.
(
8. Replace the knob and verify the setting is stil l
at 350°F.
9. Repeat step 7 until the av er age temperatur e is
within tolerance.
NOTE:
Allow the oven to cycle at least two times
between adjustment s before perfor ming the
calculation.
F25105 (Decem ber 2001) Page 18 of 60
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