Hobart F-35521, F-40287, F-40182, F-45111, KA7E User Manual
...
SERVICE MANUAL
KA SERIES ELECTRIC ROTARY
OVENS
Information in this manual superceedes TSB 1406.
KA7E ML-137701 SELF-CLEAN, GLASS BACK
ML-137709 SELF-CLEAN, SOLID BACK
KA7EM ML-137710 MANUAL-CLEAN, GLASS
BACK WITH GREASE ASSIST
ML-137711 MANUAL-CLEAN, GLASS
BACK WITHOUT GREASE
ASSIST
ML-137713 MANUAL-CLEAN, SOLID BACK
WITH GREASE ASSIST
ML-137714 MANUAL-CLEAN, SOLID BACK
WITHOUT GREASE ASSIST
KA7E WITH STAND ACCESSORY SHOWN
This Manual is prepared for the use of trained Hobart Service
Technicians and should not be used by those not properly
qualified.
This manual is not intended to be all encompassing. If you have
not attended a Hobart 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 Hobart Service Technician.
The reproduction, transfer, sale or other use of this Manual,
without the express written consent of Hobart, is prohibited.
This manual has been provided to you by ITW Food Equipment
Group LLC ("ITW FEG") without charge and remains the property
of ITW FEG, and by accepting this manual you agree that you will
return it to ITW FEG promptly upon its request for such return at
any time in the future.
- NOTICE -
A product of Hobart Service 701 S. Ridge Ave Troy, OH 45374
F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS
TABLE OF CONTENTS
GENERAL .................................................................................................. 4
REFERENCE INFORMATION .......................................................................... 4
TSB'S & TSI'S ...................................................................................... 4
INSTRUCTIONS & SPECIFICATIONS .............................................................. 4
INTRODUCTION ....................................................................................... 4
ELECTRICAL SPECIFICATIONS ....................................................................... 5
WATER SUPPLY REQUIREMENTS (KA7E ONLY) ...................................................... 5
TOOLS ................................................................................................. 5
ACCESSORY STAND INSTRUCTIONS ................................................................. 5
KA7E SELF-CLEAN (ML-137701, ML-137709) ...................................................... 5
KA7EM WITH GREASE ASSIST (ML-137710, ML-137713) .......................................... 7
KA7EM WITHOUT GREASE ASSIST (ML-137711, ML-137714) ..................................... 8
TETHER BRACKET AND OVEN MOUNTING TO STAND (KA7E, KA7EM) ........................... 9
REMOVAL AND REPLACEMENT OF PARTS .............................................................. 10
COVERS .............................................................................................. 10
PUMP COVER .................................................................................... 10
RIGHT SIDE COVER .............................................................................. 10
LEFT SIDE COVER ............................................................................... 10
TOP COVER (CONTROL PANEL) ................................................................. 10
TOP COVER ...................................................................................... 10
FAN COVER ...................................................................................... 11
DOOR ................................................................................................ 11
DOOR ADJUSTMENT ............................................................................. 12
DOOR SWITCH ADJUSTMENT (KA7E ONLY; IF REQUIRED) ..................................... 12
DOOR SWITCH MAGNET (KA7E ONLY) .............................................................. 13
OUTER DOOR GLASS ................................................................................ 13
WASH ARM, STRAINER PANS, STRAIN PAN SUPPORT, DRAIN SHROUD (KA7E ONLY) ............. 13
LAMP ................................................................................................. 14
FAN MOTORS ASSEMBLY ............................................................................ 15
HEATING ELEMENTS ................................................................................ 17
HIGH LIMIT THERMOSTAT ........................................................................... 18
TEMPERATURE SENSOR ............................................................................ 18
CONTACTORS ....................................................................................... 19
POWER SWITCH AND MOMENTARY SWITCHES .................................................... 19
DISPLAY BOARD AND KEYPAD ...................................................................... 20
ROTOR STOP/START SWITCH ....................................................................... 21
MEAT PROBE MINI JACK ............................................................................. 22
CAPACITORS ........................................................................................ 22
WATER LEVEL CONTROL BOARD (KA7E ONLY) ..................................................... 23
WATER LEVEL SENSOR (KA7E ONLY) ............................................................... 24
CHEMICAL SENSOR (KA7E ONLY) ................................................................... 24
WASH PUMP RELAY (KA7E ONLY) ................................................................... 24
TRANSFORMER ...................................................................................... 25
CPU BOARD .......................................................................................... 25
PERISTALTIC PUMPS ................................................................................ 26
PUMP REMOVAL ................................................................................. 26
PROCEDURE TO REPLACE PUMP HOSE ........................................................ 26
WATER FILL VALVE (KA7E ONLY) .................................................................... 28
WASH PUMP (KA7E ONLY) ........................................................................... 28
DRAIN PUMP (KA7E ONLY) ........................................................................... 29
DRIVE MOTOR ASSEMBLY ........................................................................... 29
DRIVE MOTOR ADJUSTMENT .................................................................... 31
DRIVE MOTOR, SPEED REDUCER AND GEARBOX .................................................. 33
SERVICE PROCEDURES AND ADJUSTMENTS ........................................................... 36
SERVICE MODE - PROGRAMMING AND DIAGNOSTICS ............................................. 36
F25294 Rev. A (0412) Page 2 of 72
KA SERIES ELECTRIC ROTARY OVENS
PROCEDURE TO ENTER SERVICE MODE ....................................................... 36
PROCEDURE TO TOGGLE BETWEEN NO ID AND OPERATOR ID MODE ........................ 36
PROCEDURE TO TOGGLE BETWEEN 9 AND 99 PROGRAMS .................................... 36
SERVICE MODE PARAMETERS .................................................................. 36
DEMO MODE (KA7E ONLY) ........................................................................... 41
RETURN TO NORMAL MODE ..................................................................... 43
TEMPERATURE SENSOR TEST ...................................................................... 43
HEATING ELEMENT TEST ............................................................................ 44
PUMP, K3 RELAY COIL TESTS ....................................................................... 44
CONTROLS CALIBRATION ........................................................................... 44
CALIBRATION PROCEDURE ..................................................................... 44
ELECTRICAL OPERATION ................................................................................ 46
COMPONENT FUNCTION ............................................................................ 46
SEQUENCE OF OPERATION ......................................................................... 46
PROGRAMMED COOKING ....................................................................... 46
WASHING CYCLE SEQUENCE OF OPERATIONS ................................................ 47
USER PRESSES CLEAN BUTTON ................................................................ 47
CONTROLS EXPLANATION .......................................................................... 48
MODEL KA7E ..................................................................................... 48
MODEL KA7EM ................................................................................... 49
COMPONENT LOCATIONS ........................................................................... 50
MODEL KA7E ..................................................................................... 50
MODEL KA7EM ................................................................................... 52
WIRING DIAGRAMS .................................................................................. 54
KA7E - COMPONENT CONNECTIONS ............................................................ 54
KA7EM - COMPONENT CONNECTIONS .......................................................... 55
POWER CONNECTION ........................................................................... 56
SCHEMATIC DIAGRAMS ............................................................................. 57
MODEL KA7E ..................................................................................... 57
MODEL KA7EM ................................................................................... 59
PLUMBING DIAGRAMS (KA7E ONLY) ................................................................ 62
TROUBLESHOOTING ..................................................................................... 64
TROUBLESHOOTING ................................................................................. 64
TROUBLESHOOT ROTOR COMPONENTS ........................................................... 67
APPENDIX ................................................................................................ 69
REVERSING CONTROLS ............................................................................. 69
© HOBART SERVICE 2012
Page 3 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - GENERAL
GENERAL
Oven cleaners are corrosive and can cause chemical burns. Rubber gloves, goggles and protective
clothing are required. Read and follow the instructions for the oven cleaner.
Safety standards require that, when the rotary oven’s electric supply line is properly connected to the
electrical power supply, an adequate means must be provided to limit movement of the oven without applying stress
to the electrical conduit. This means that, as part of the installation, the oven must be secured to either the wall or
the floor to limit movement of the oven and, thus, preventing damage to the flexible electrical conduit during cleaning,
maintenance and service operations.
REFERENCE INFORMATION
TSB'S & TSI'S
NOTE: Links or references to the TSB's are provided
here and in the appropriate sections of service
manual.
TSB 1381 KA7E ROTARY OVEN SCRAMBLED VFD DISPLAY.
TSB 1383
TSB 1400 KA7E - LEAKS AT DRIVE ARM GASKET DURING WASH CYCLE.
TSB 1417 KA7E - CLOGGING AT INPUT AND OUTPUT OF PERISTALTIC PUMPS.
TSI
Instructions & Specifications
KA7E F-40182 F-35521
KA7EM F-40287 F-45111
ROTISSERIE OVENS HR5E, HR7E AND KA7E NEW DRIVE MOTOR
ASSEMBLIES.
HR7E AND KA7E ROTISSERIE OVEN ROTOR CRANK ARM DISENGAGING
FROM ROTOR.
Model Specifications Instructions Manual
INTRODUCTION
• Electronic control with message center, time,
temperature and program display features.
See Multimedia
section in TIS.
See Multimedia
section in TIS.
See Multimedia
section in TIS.
All pictures and illustrations shown are of a KA7E
unless otherwise specified. When specific model
number designations are needed for clarity, they are
added to the procedure or picture.
General
• Capacity of the KA series seven spit oven is 21
to 35 chickens.
• Stacking kit available to stack ovens.
• Refer to the Specifications sheet for oven
Installation details and Instructions manual for
operating and cleaning instructions.
KA7E - Model Description
• Rotisserie oven with automatic clean cycle.
F25294 Rev. A (0412) Page 4 of 72
• Pass through controls on the unload side to
• Equipped with grease assist and chemical
• Pump for automatic draining.
KA7EM - Model Description
• Rotisserie oven without automatic clean cycle
• Electronic control with time, temperature and
• Manual drain valve.
snooze cook cycle, silence beeper and stop cook
cycle.
cleaner peristaltic pumps.
features (manual cleaning).
program display features.
KA SERIES ELECTRIC ROTARY OVENS - GENERAL
• Equipped with grease assist and chemical
cleaner peristaltic pumps.
• Available with a grease assist peristaltic pump to
remove grease during a cook cycle (optional).
ELECTRICAL SPECIFICATIONS
KA7E AND KA7EM
VOLTS PHASE WATTAGE AMPERAGE
208 1 9,300 42.8
208 3 9,300 24.7
240 1 9,300 37.7
240 3 9,300 21.8
NOTE: Separate power supplies must be used when
stacking two ovens.
INSTALLATION NOTE:
Before putting oven into service, check to ensure
incoming power terminal block TB6 wire retaining
screws are tight.
• VOM with AC current tester (Any VOM with a
sensitivity of at least 20,000 ohms per volt can be
used.)
• Temperature Tester
• Field Service Grounding Kit
• Torque wrench capable of measuring up to 45 inlbs.
• Jewelers screwdriver
• Power switch and momentary switch removal
tool (two required) made locally to dimensions in
graphic below
NOTE: Material for tool can be aluminum, hard plastic
or any other hard material which can be easily
fabricated to dimensions.
Ovens mounted on casters or installed on stands with
casters must be provided with an adequate restraining
means to guard against transmission of strain to the
electric supply line. Instructions for tethering are
included in stacking kit instructions and with optional
oven stand. Disconnect the flexible electrical
conduit(s) before disconnecting the restraint.
WATER SUPPLY REQUIREMENTS
(KA7E ONLY)
NOTE: For proper operation, use only HOT water
supply. For installations at the end of a long hot water
line, a second pre-rinse may be required to be
programmed to prime the line.
Hot water supply:
• 3/4" hose bib fitting.
• 0.5 GPM @ 25-50 PSI.
• 120°F - 140°F.
• Recommended hardness, 4 - 6 grains.
• Minimum conductivity required, 30
MICROMHOS/CM.
Fig. 1
ACCESSORY STAND
INSTRUCTIONS
NOTE: Separate units can be lifted by means of a
forklift. To do this, open both doors. Remove fan
cover. Slide forks all of the way thru top of oven. Make
sure forks rest on the frame member and are spread
as far apart as possible. Stacked units must not be
lifted in this manner.
KA7E Self-Clean (ML-137701, ML-137709)
1. Remove Right Side Cover.
2. With oven lifted, remove drain plug and save it.
Drain hose is connected here and routed down
thru base.
3. Remove electric power cord blank and install
proper restraining fitting for power cord.
TOOLS
• Standard set of hand tools
Page 5 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - GENERAL
BOTTOM VIEW SHOWN
4. Remove screws securing water fill valve to utility
plate.
5. Remove screws securing drain manifold to utility
plate and utility plate to frame.
PREVIOUS CONSTRUCTION
6. Current construction - Remove strain relief nuts
securing chemical-in and grease-out hoses.
A. Remove hoses from strain relief fittings (pull
hoses through fittings but leave connected
to machine).
CURRENT CONSTRUCTION
7. Previous construction - Remove chemical-in and
grease-out hoses from 45 degree strain relief
fittings.
Fig. 5
8. Discard original utility plate, saving screws.
9. Slide mounting bracket off water fill valve.
10. Reinstall mounting bracket to water fill valve
F25294 Rev. A (0412) Page 6 of 72
Fig. 6
(rotated as shown).
KA SERIES ELECTRIC ROTARY OVENS - GENERAL
15. Route water supply through the bottom of the
stand and connect. (Fittings mate to ¾ inch male
hose bib, not supplied.)
Fig. 9
Fig. 7
11. Install water valve onto bracket on new utility
plate (supplied with stand).
Fig. 8
12. Install new utility plate onto oven using screws
removed earlier.
13. Install drain plug removed earlier.
16. Route water drain through the bottom of the
stand and connect. (Fittings mate to 1 inch
female NPT, not supplied.)
17. Route chemical-in and grease-out hoses down
through bottom of machine into stand. Connect
hoses to grease vessel and chemical container.
18. Route power cord thru base into oven and
connect to terminal block.
19. Proceed to Tether Bracket and Oven Mounting to
Stand (KA7E, KA7EM).
KA7EM with Grease Assist (ML-137710,
ML-137713)
1. Remove Right Side Cover.
2. Remove electric power cord blank. Install power
cord restraining fitting (not supplied) in the proper
hole E1.
14. Install new hoses supplied with oven and route
down into base.
Fig. 10
Page 7 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - GENERAL
3. Remove screws and valve bracket from factory
standard utility plate.
4. Save screws and bracket. Discard original
factory standard utility plate.
5. Remove grease-out hose from 45 degree strain
relief fitting.
Fig. 12
3. Remove screws from factory standard utility
plate.
Fig. 11
6. Install valve bracket from old plate onto new utility
plate (supplied with stand).
7. Install new utility plate assembly onto oven using
screws removed earlier.
8. Install ¾" MNPT to ¾" ID, 90 deg, Barb Hose
Fitting (not supplied) into P1 drain connection.
NOTE: P1 drain connection cannot drop through into
stand and must exit out the right side of the oven.
9. Route grease-out hose down through bottom of
machine into stand.
10. Route power cord through stand up into oven and
connect to terminal block.
11. Proceed to Tether Bracket and Oven Mounting to
Stand (KA7E, KA7EM).
KA7EM without Grease Assist (ML-137711,
ML-137714)
1. Remove Right Side Cover.
2. Remove electric power cord blank. Install power
cord restraining fitting (not supplied) in the proper
hole E1.
Fig. 13
4. Install ¾" MNPT to ¾" ID, 90 deg, Barb Hose
Fitting (not supplied) into P1 drain connection.
5. Install new utility plate (supplied with stand)
assembly onto oven using screws removed
earlier.
6. Install Plug Button (supplied with stand
accessory) into new utility plate.
F25294 Rev. A (0412) Page 8 of 72
KA SERIES ELECTRIC ROTARY OVENS - GENERAL
Fig. 14
7. Route power cord through stand up into oven and
connect to terminal block.
2. Using holes in oven's caster mounting plate,
secure oven to stand using 4 screws and 4
washers provided with stand accessory. Install
washers such that bolt does not slip through.
8. Proceed to Tether Bracket and Oven Mounting to
Stand (KA7E, KA7EM).
Tether Bracket and Oven Mounting to Stand
(KA7E, KA7EM)
1. Ensure that tether bracket is installed.
A. The bracket must be installed along with
one of the swivel casters to a corner as
shown using the caster hardware provided.
The remaining open hole in the center of the
tether bracket is to be used to secure one
end of the tether (locally supplied chain,
cable, etc.). The other end of the tether is to
be secured to an anchoring point in the wall
or floor when oven installation is complete.
Make sure that during oven movement, no
stress is applied to the flexible electrical
conduit(s).
Fig. 16
3. Install all removed covers.
4. Continue with installation per Instructions
Manual.
Fig. 15
Page 9 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
Due to use of chemical detergents, all interior replacement hardware must be stainless steel hardware
as listed in the parts catalog.
COVERS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Pump Cover
1. Remove two thumbscrews securing pump cover
and lift cover off.
2. Reverse procedure to install.
NOTE: Anytime service is performed requiring the
right side cover to be removed, check to ensure
incoming power terminal block wire retaining screws
are tight.
Right Side Cover
1. Remove Pump Cover.
2. Remove twelve screws securing right side cover
to frame.
Left Side Cover
1. Remove ten screws securing left side cover to
frame.
2. Loosen one screw securing top center of cover.
3. Loosen one screw securing top center of cover.
Fig. 17
4. Remove cover.
Fig. 18
3. Remove cover.
4. Reverse procedure to install.
Top Cover (Control Panel)
1. Remove screws securing top cover over controls
area.
2. Remove cover.
3. Reverse procedure to install.
Top Cover
1. Remove screws securing Top Cover (Control
Panel).
2. Remove cover.
3. Remove remaining screws securing top cover
and lift cover off.
5. Reverse procedure to install.
F25294 Rev. A (0412) Page 10 of 72
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
Fig. 19
4. Reverse procedure to install.
DOOR
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove Left Side Cover.
2. Open oven door and pull inner oven door to
overcome magnet hold to main door.
Fan Cover
1. Open door.
2. Remove nut securing fan cover to top of cavity.
3. Grab deflector edge and pivot edge toward you
to disengage cover from studs.
4. Slide cover off studs at opposite side and remove
cover.
NOTE: Fan cover can be removed thru either door in
the same manner.
Fig. 21
3. Lift inner door hinge pins out of hinge bushings
and lay door on a flat padded surface.
VIEW - AS LOOKING THROUGH DOOR GLASS
5. Reverse procedure to install.
NOTE: Make sure all six studs are engaged properly
and that the cover does not hang down.
Page 11 of 72 F25294 Rev. A (0412)
Fig. 22
4. Remove screws securing facade to oven.
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
8. Reverse procedure to install but leave nuts
securing hinge plate loose. Perform Door
Adjustment.
Door Adjustment
1. With top hinge plate mounting nuts loose, use an
object to shim handle end of door to make bottom
of door parallel to the sump facade.
Fig. 23
5. Close door.
6. Remove nuts securing top hinge to cabinet.
Fig. 24
7. Carefully remove hinge plate while supporting
hinge backing plate and lift door off lower hinge
pin.
Fig. 26
2. Tighten hinge plate nuts and check door
operation. Make sure there is no interference or
rubbing when door is operated. Door must not
contact sump facade when opening or closing.
3. Check Door Switch Adjustment (KA7E only; if
required). LED at CPU board input X22 should
be on when both doors are closed and both door
switches are closed.
Door Switch Adjustment (KA7E only; if required)
1. With oven top facade removed to access door
switch, loosen switch mounting screws and
adjust switch as required. LED at CPU board
input X22 should be on when both doors are
closed and both door switches are closed.
2. Install all covers and check for proper operation.
Fig. 25
F25294 Rev. A (0412) Page 12 of 72
Fig. 27
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
DOOR SWITCH MAGNET (KA7E
ONLY)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Open oven door and pull inner oven door to
overcome magnet hold to main door.
OUTER DOOR GLASS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove door as outlined under DOOR.
2. Lay door on a flat padded surface.
3. Remove screws securing glass and remove
glass.
4. Install new glass in same orientation as old glass.
NOTE: Avoid contact such as bumping or hitting, or
abrasion of glass edges.
5. Install in reverse order and adjust door as
outlined under Door Adjustment.
WASH ARM, STRAINER PANS,
STRAIN PAN SUPPORT, DRAIN
SHROUD (KA7E ONLY)
Fig. 28
2. Remove screws securing magnet housing and
remove magnet.
Fig. 29
3. Reverse procedure to install and check Door
Switch Adjustment (KA7E only; if required).
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Open oven door.
2. Use strainer pan handle and lift pan out of oven.
NOTE: Pan positions are not interchangeable.
Fig. 30
3. To remove wash arm, unscrew knurled part of
wash arm.
Page 13 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
Fig. 31
4. To remove strain pan support, lift end and
disengage other end from stud.
LAMP
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Do not touch the glass portion of the lamp
with your hands. The oil from your hands could affect
the operation of the lamp. Skin oil may be removed
with alcohol while the lamp is cold.
NOTE: Use a clean rag or paper towel to handle
replacement lamp.
1. Open door.
2. Remove screws securing facade to oven.
Fig. 32
5. To remove drain shroud, remove nuts and
washers securing shroud and lift shroud out of
oven.
Fig. 33
6. Reverse procedures to install.
Fig. 34
3. Remove two nuts securing lamp assembly to top
of oven.
Fig. 35
4. Lift lamp assembly out of oven and support it.
5. Loosen screws in terminal block securing lamp
wires and pull wires out of block.
F25294 Rev. A (0412) Page 14 of 72
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
Fig. 36
6. Work lamp with wires out of lamp brackets. Wires
can not be removed from lamp.
Fig. 37
7. Install and tighten insulators evenly to prevent
damage.
8. Reverse procedure to install.
FAN MOTORS ASSEMBLY
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Fig. 38
4. Remove washer from both shafts.
Fig. 39
5. Remove C clip from both shafts.
1. Remove
2. Remove wing nut securing each fan blade. Nut is
left hand thread, turn clockwise to remove.
3. Remove both fan blades.
Right Side Cover and Fan Cover.
Page 15 of 72 F25294 Rev. A (0412)
Fig. 40
6. Unscrew both fan mounting nuts.
NOTE: Check condition of o-ring on fan mounting nut
and replace if necessary.
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
C. Work pipe out of oven.
Fig. 41
7. KA7E only:
Fig. 42
A. Loosen hose clamp and remove hose from
control side nozzle and pipe assembly.
B. Remove screws and nuts securing control
side nozzle pipe assembly to top of oven.
NOTE: Check condition of o-rings on screw heads
and replace if necessary.
Fig. 44
8. Insert two large screwdrivers or similar objects
that can lift fan motor assembly enough for motor
shafts to clear inside ceiling.
Fig. 45
9. Identify and disconnect motor wires.
10. Carefully slide fan motor assembly out of cavity.
11. Remove screws securing fan motor assembly
and lift out.
Fig. 43
F25294 Rev. A (0412) Page 16 of 72
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
2. Disconnect lead wires from element being
replaced.
Fig. 46
12. Remove o-ring from old fan motor shaft and
install on new fan motor. If not in good condition,
install new o-ring.
Fig. 47
13. Reverse procedure to install.
14. After installing the fan blade, verify that it does
not rub the top of the cavity. If required, remove
fan blade and tighten fan mounting nut (shown in
Step 6 above).
Fig. 48
3. Use a wrench on element inside oven while
removing and installing mounting nut.
Fig. 49
4. Remove nuts securing element being replaced.
NOTE: If mounting nuts will not slide over wire lead
backup nuts, loosen them or remove them.
HEATING ELEMENTS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove Right Side Cover and Fan Cover.
Fig. 50
5. Remove screws securing element support
bracket to ceiling and remove bracket.
Page 17 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
Fig. 51
6. Slide element out of wall.
7. Clean off old gasket that may stick to wall or
washer and replace with new gasket (not
included with element).
Fig. 53
3. Disconnect wires from high limit thermostat.
4. Remove screws securing high limit to frame.
Fig. 52
8. Reverse procedure to install.
9. Torque element mounting nuts to 45in-lbs. Use
backup wrench on element inside oven to
prevent twisting and damage to element.
10. Torque nuts securing wires onto element to 1420in-lbs. Use a backup wrench on back nut to
prevent twisting and damage to element.
HIGH LIMIT THERMOSTAT
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove Right Side Cover.
2. Pull high limit probe out of hole located in top right
hand corner.
Fig. 54
5. Reverse procedure to install.
NOTE: Set the high limit thermostat to its maximum
clockwise position.
TEMPERATURE SENSOR
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove Right Side Cover.
2. Remove screw and nut securing temperature
sensor to mounting bracket.
F25294 Rev. A (0412) Page 18 of 72
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
POWER SWITCH AND
MOMENTARY SWITCHES
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
NOTE: Momentary switches on KA7E only.
Fig. 55
3. Disconnect wires from temperature sensor.
4. Pull temperature sensor out thru the opening in
oven wall.
5. Reverse procedure to install.
CONTACTORS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove
2. Disconnect lead wires from contactor being
replaced.
3. Push down on top of contactor and pull bottom of
contactor out then up to remove it from the din
rail.
Right Side Cover.
1. Remove
2. Disconnect wires from switch.
NOTE: There are four tabs (two at each end) that
must be depressed in order for switch to slide out of
bezel.
SWITCH DISASSEMBLED FOR VIEW
3. Use recommended tools to release locking tabs
at both top and bottom of switch body.
Right Side Cover.
PARTS REMOVED FOR VIEW
4. Reverse procedure to install.
NOTE: Picture below shows parts not installed in
oven for illustration purposes. It is recommended that
you fully insert tools and gently spread tool ends apart
as shown. Then gently pull switch out of bezel. Some
gentle prying may be necessary to start switch out of
bezel.
Page 19 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
2. Unplug ribbon cable from display board.
A. Spread retaining clips to extract plug from
socket.
Fig. 58
Fig. 60
3. Remove six nuts securing display panel with
display board attached and lift out of oven.
Fig. 59
4. Push switch out of bezel.
5. Reverse procedure to install.
DISPLAY BOARD AND KEYPAD
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Certain components in this system are
subject to damage by electrostatic discharge during
field repairs. A field service grounding kit is available
to prevent damage. The field service grounding kit
must be used anytime the control board is handled.
TSB 1381 KA7E ROTARY OVEN SCRAMBLED VFD
DISPLAY.
1. Remove
F25294 Rev. A (0412) Page 20 of 72
Right Side Cover.
Fig. 61
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
ROTOR STOP/START SWITCH
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove Right Side Cover.
2. Unscrew black knob and remove from switch.
Fig. 62
4. Unplug keypad cable from display board.
5. Remove eight nuts and washers securing board
to panel and lift board off studs.
Fig. 63
6. Remove spacers from studs on display panel.
Fig. 65
3. Unscrew mounting nut.
Fig. 66
Fig. 64
7. Reverse procedure to install.
4. Pull switch out of hole.
5. Identify and disconnect wires.
6. Reverse procedure to install.
Page 21 of 72 F25294 Rev. A (0412)
KA SERIES ELECTRIC ROTARY OVENS - REMOVAL AND REPLACEMENT OF PARTS
MEAT PROBE MINI JACK
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove Right Side Cover.
2. Mini jack is located under power switch.
Fig. 68
4. Identify and disconnect wires from mini jack
terminals.
Fig. 67
3. Use a small screwdriver or similar object to
carefully pry tabs out and work retainer clip off
jack.
NOTE: Jack shown removed from oven for view. Also
notice that wires are polarity sensitive and must be
connected properly for correct operation.
5. Reverse procedure to install.
CAPACITORS
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
1. Remove
2. Disconnect wires from capacitor being replaced.
3. Remove hardware securing capacitor being
replaced and remove capacitor.
Right Side Cover.
F25294 Rev. A (0412) Page 22 of 72
Fig. 69
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