Duke 59-E3L Guide

Installation, Operation,
Parts & Maintenance Manual
P/N 523513
Rev B 02/11/2021
ELECTRIC HALF-SIZE CONVECTION OVEN
LITTLE CAESARS
MODEL
59-E3L
This manual is Copyright © 2021 Duke Manufacturing Co. All rights reserved.
Reproduction without written permission is prohibited. Duke is a registered
trademark of the Duke Manufacturing Co.
CAUTION: Please read this manual completely before attempting
to install, operate or service this equipment
WARNING for CA residents: go to www.dukemfg.com/prop65 for prop 65 warning

Electric Half-Size
Convection Oven Manual
2
TABLE OF CONTENTS
Important Safety Instructions.......................................................................................................................................2-3
Pre-Installation Instructions ..............................................................................................................................................4
A. Qualied Personnel............................................................................................................................................4
B. Delivery & Inspection.........................................................................................................................................4
59-E3L Electrical Specications........................................................................................................................................5
Wiring Diagram......................................................................................................................................................................6
Installation Instructions ......................................................................................................................................................7
C. Location of Oven.................................................................................................................................................7
D. Electrical Connections.......................................................................................................................................7
E. Ventilation ..............................................................................................................................................................7
F. Electric Oven Assembly .....................................................................................................................................7
G. Adjustments Associated with Installation .................................................................................................8
Control Panel...........................................................................................................................................................................9
Operation .............................................................................................................................................................................. 10
A. Program Parameters ....................................................................................................................................... 10
B. Programming Instructions............................................................................................................................ 10
C. Operation of Oven........................................................................................................................................... 11
D. Cool Down Operation .................................................................................................................................... 12
Cleaning the Oven ............................................................................................................................................................. 13
Maintenance Instructions ............................................................................................................................................... 14
A. Adjustments....................................................................................................................................................... 14
B. Door Adjustments............................................................................................................................................ 14
C. Lubrication ......................................................................................................................................................... 14
D. Calibration Check............................................................................................................................................. 14
Trouble Shooting................................................................................................................................................................ 15
Repair Parts List and Corresponding Drawings.................................................................................................16-19
IMPORTANT SAFETY INSTRUCTIONS
Throughout this manual, you will nd the following safety words and symbols that signify
important safety risks with regards to operating or maintaining the equipment.
Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
Indicates Important Information
Indicates electrical shock hazard which, if not avoided, could
result in death or serious injury and/or equipment damage.
Indicates hot surface which, if not avoided, could result in
minor or moderate injury.
Never steam clean or hose down with water. Electric
component will fail due to moisture.

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Electric Half-Size
Convection Oven Manual
In addition to the warnings and cautions in this manual, use the following guidelines for
safe operation of the unit.
• Read all instructions before using equipment.
• For your safety, the equipment is furnished with a properly grounded cord connector. Do
not attempt to remove or disconnect the grounded connector.
• Install or locate the equipment only for its intended use as described in this manual.
• Do not use corrosive chemicals on this equipment.
• Do not operate this equipment if it has a damaged cord or plug, if it is not working
properly, or if it has been damaged or dropped.
• This equipment should be serviced by qualied personnel only. Contact the nearest
Duke authorized service facility for adjustment or repair.
• Do not block or cover any openings on the unit.
• Do not immerse cord or plug in water.
• Keep cord away from heated surfaces.
• Do not allow cord to hang over edge of table or counter.
The following warnings and cautions appear throughout this manual and should be
carefully observed.
• Turn the unit o, disconnect the power source and allow unit to cool down before
performing any service or maintenance on the unit.
• The procedures in this manual may include the use of chemical products. You must read
the Material Safety Data Sheets before using any of these products.
• The unit should be grounded according to local electrical codes to prevent the
possibility of electrical shock. It requires a grounded receptacle with dedicated electrical
lines, protected by fuses or circuit breaker of the proper rating, in accordance with all
applicable regulations.
• Disposal of the unit must be in accordance with local environmental codes and/or any
other applicable codes.
• This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance
by a person responsible for their safety.
• Do not store gasoline or other ammable liquids in the vicinity of this appliance.
• Improper installation, adjustment, service or maintenance can cause property damage,
injury or death. Read all installation, operating and maintenance instructions thoroughly
before installing or servicing this appliance.
IMPORTANT SAFETY INSTRUCTIONS

Electric Half-Size
Convection Oven Manual
4
QUALIFIED PERSONNEL
These installation instructions are for the use of qualied installation and service personnel only.
Installation or service by other than qualied personnel may result in damage to the oven and/or injury to
the operator.
Qualied installation personnel are those individuals, rms, companies or corporations which either in
person or through an agent are engaged in and responsible for:
• The installation of electrical wiring from the electric meter, main control box or service outlet to the
electrical appliance. Qualied installation personnel must be familiar with all precautions required and
have complied with all requirements of state and local authorities having jurisdiction. See: National
Electrical code, ANSI/NFPA 70-1990.
PREINSTALLATION INSTRUCTIONS
DELIVERY AND INSPECTION
Duke Manufacturing Co., does everything within its power to insure you receive your oven in good
condition. They are strapped down on heavy wooden skids and surrounded by heavy “tri-wall” cartons
to prevent shipping damage. They have all been carefully inspected before they were packaged and
consigned to the carrier.
Upon Delivery of your Duke oven:
• Look over the shipping container carefully noting any exterior damage on the delivery receipt which
must also be signed by the driver/delivery person.
• Un-crate and check for any damage which was not evident on the outside of the shipping container.
This is called concealed damage. The carrier must be notied within fteen (15) days of the delivery of
the oven and the carton, skid and all packaging materials must be retained for inspection.
Duke Manufacturing Co. cannot assume liability for loss or damage suered in transit. The carrier assumes
full responsibility for delivery in good order when the shipment was accepted. However, we are prepared to
assist you in ling any freight claim.

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Electric Half-Size
Convection Oven Manual
SPECIFICATIONS
Model
Depth Width Height Cube
ft.
crat-
ed
Weight
in. cm in. cm in. cm lbs. kg
59-E3 27.0 68.6 48 121.9 68.25 173.4 24.3 265 120.5
DIMENSIONS: Freight Class: 85
Electrical Specications - Per Section
208V
Amps
240V
Amps
KW
3 Phase 24.0 21.0 8.0
▲Electronic connection point
POWER SUPPLY CONNECTIONS
L
1
L
2
L
3
153213
Plug,
Ground
GROUND WIRES
SOURCE
WIRES
Block, Terminal 4 Pole
L1 & L2 (1PHASE)
L1, L2 & L3 (3PHASE)
14 1
2
"
12 1
8
"
2 1
8
"
48"
36"
25 3
4
"
4 3
4
"
68 1
4
"
42 1
8
"

Electric Half-Size
Convection Oven Manual
6
B
D
1
2
3
4
B
D
1
2
3
4
Centrifugal Switch
1-SPEED
CONV.
BLO WER
MOTOR
1-SPEED
CONV.
BLO WER
MOTOR
Motor
Junction Box
BRN
BRN
BLK YEL
ELC0445 WIRE DIAGRAM CCSI CONVECTION OVEN (Electric)
L1
L2
L3
N
CONTACTOR
Back up
Thermostat
FUSES
Heat Indicator
Light
D oo r Cl o sed
N.O.
N.C.
BLK
RED
RED
WHT w/ Red
WHT w/ Blk
YEL
BLK
RED
YEL
WHT
BLK
WHT
WHT w/ Red
WHT w/ Blk
BLK w/ Wht
BLK w/ Red
208Vac/240Vac 60Hz 3 Phase
POWE R
FUSES
T er min al
Block
Safety Earth
Ground
H1 H2 H3
CAVI TY TEM P SENSE
Front Control Panel
OVEN OFF
COOK
COOL
DOWN
LIGHT OFF
OVEN READY
5 2
15
4 7
10
8
13 14
1
11
5 2
15
4 7
10
8
13 14
1
11
5 2
15
4 7
10
8
13 14
1
11
5 2
15
4 7
10
8
13 14
1
11
Back Up
Digital
31
10
9
32
33
31
10
9
32
33
Back Up
Digital
31
10
9
32
33
Cool
Dow n
Cook
BLK (Contactor)
BLK (Controls)
RED (Contactor)
RED (Controls)
WHT w/Red (H2)
WHT w/Blk (H1)
YEL (Contactor)
WHT (H3)
L1
L2
L3
N
208Vac/240Vac
60Hz
Single Phase
BLK (Contactor)
BLK (Controls)
RED (Contactor)
RED (Controls)
WHT w/Red (H2)
WHT w/Blk (H1)
YEL (Contactor)
WHT (H3)
L1
L2
L3
N
208Vac/240Vac
60Hz
Single Phase
N.0.
COIL
N.0.
COIL
CAVI TY TEM P
10
9
11
5
19
6
10
9
10
9
31
31
33
3
COM
9
10 11
11
18 19
9
10 11
12
12
3
3
33
33
4
4
4
1
8 1 4
6 6 5 5
COILCOIL
2
2NC
1
1
20
Tr ansf or me r
1 2
5 6
7
8
11 12
Tr ansf or me r
1 2
5 6
7
8
11 12
32
32
20
20
10
9
11 22 33 44 551 2 3 4 5
BLK
BLK (Contactor)
BLK (Controls)
RED (Contactor)
RED (Controls)
WHT w/Red (H2)
WHT w/Blk (H1)
YEL (Contactor)
WHT (H3)
L1
L2
L3
N
220-240/380-415Vac
50/60Hz
3 Phase
4
19
11/18
10
18
9
Door
Switch
Relay
YEL
BRN
WHT
RED
RED
RED
RED
GRN
GRN
RED
RED
RED
RED
RED
RED
BRN
ORN
RED
W HT
BRN
Digital Control
Power Switch
Control Select Switch
Half Size Element
Connect ion s
H1 H2 H3
WIRE DIAGRAM

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Electric Half-Size
Convection Oven Manual
LOCATION OF THE OVEN
Proper planning and placement of the oven will give you the best results in terms of long term user
convenience and satisfactory performance. We urge you to give adequate thought in the placement of your
oven prior to its arrival.
• The oven should be placed in an area which is free from drafts and accessible for proper operation and
servicing.
• The area around the oven must be kept clear of combustible materials. A minimum of one (1) inch
from the left or right side, three (3) inches from the rear and eight (8) inches from the oor must be
maintained between the oven and any combustible or non-combustible surface.
It is also important not to obstruct the natural ow of ventilation air if the oven is to operate properly. Do
not place any objects on top of the oven. This oven should not be installed on a curb base or sealed to the
wall. Either condition can prevent proper ventilation of the blower motor. The blower motor has a thermal
protection device which will trip because of excessive ambient temperatures at the side of the oven. If
the device trips continually, this condition should be corrected immediately to avoid damaging the oven
permanently.
Before making any connections to the oven, check the rating plate to be sure the oven specications
concur with the voltage and phase to be supplied to the oven.
The rating plate and serial number data are located behind the motor access cover on the right side panel.
INSTALLATION INSTRUCTIONS
ELECTRICAL CONNECTIONS
Each section of the Duke 5/9 Half-Size Convection Ovens is rated at 8.0 kW.
Your oven is supplied for connection to a 208 or 240 volt, 1 phase or 3 phase grounded circuit.
The electric motor, indicator lights and control circuits are powered internally and do not have a
separate power supply.
Before making any connections to these units, check the rating plate to assure that the voltage
and phase rating of the oven is compatible with the electrical supply. When installing, all ovens
must be electrically grounded in accordance with local codes or in the absence of local codes,
with the National Electrical Code, ANSI/NFPA 70-1990 (in Canada - CSA Std. C22.1).
Wiring diagrams are located on the inside of the motor access panel, on the right side of the oven.
VENTILATION
Proper ventilation is very important for the proper function of your oven. A good ventilation system will
allow the oven to function properly as well as remove unwanted vapors. Not venting the ovens properly
can result in unsatisfactory baking results as well as the possibility of damaging your oven.
OVEN ASSEMBLY
Before assembling and installing the oven, please check to make sure that all necessary parts are present.
Please check the interior of all oven sections for the parts needed to assemble and install your oven(s).

Electric Half-Size
Convection Oven Manual
8
INSTALLATION INSTRUCTIONS
ADJUSTMENTS ASSOCIATED WITH INSTALLATION
Each oven section and all its components parts have been tested thoroughly and inspected before your
oven was shipped from the factory. However, it is sometimes necessary to further test or adjust the oven
once it has been installed. Such adjustments are the responsibility of the Dealer or Installer. These types of
adjustments are not considered defects, rather a normal and routine part of the proper installation of the
equipment.
These adjustments include but are not limited to:
• Adjustment and re-calibration of the controller
• Adjustment to the doors
• Leveling and tightening of fasteners.
NOTE: No installation should be considered complete without proper inspection and, if
necessary, any adjustments by qualied service or installation personnel.
LITTLE CAEARS OVEN CONTROL
LITTLE CAEARS CONTROLS
Main Power On/OFF Switch
Power On Light - Indicates elements are on. Light
will go out when set temperature has been reached
Display - Indicated Time and/or Temperature
Programing Buttons
Preprogrammed Buttons - for 1through 5 dierent
recipe settings
Fuses - 10 Amp Time Delay Protective

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Electric Half-Size
Convection Oven Manual
B. PROGRAMMING INSTRUCTIONS
Toadjustaparameter: cooktime,loadcontrolsettings,
duty cycle time- based, setpoint, oset, the following
process needs to be followed:
a. Select thedesiredmenu itembyholding downthe
MENU push button and pressing the UP/DOWN
buttons until the menu item is displayed (The
Menu items are numbered S1 through S7)
b. Select thedesiredmenu itembyholding downthe
MENU push button and pressing the UP/DOWN
buttons until the menu item is displayed (The
Menu items are numbered S1 through S7)
c. Press one of the following buttons:
Button 1 Pressed:
The display will show the number “2”.
1. Press the button that is to have its baking time
changed. The baking time for the particular switch
will be shown in the display. A baking time must
be programmed for selections 1, 2, 3 and 4. Use
the UP/DOWN buttons to change the baking time
to that desired.
NOTE: To change seconds hold in the start
switch for one tray, then use the UP/DOWN
switches.
2. Press the “Enter” switch to store the change.
Button 2 Pressed:
The setpoint temperature will be shown in the display.
1. Use the UP/DOWN switch to set the new setpoint.
2. Press the“ENTER”switch to store the new setpoint.
Button 3 Pressed:
The display will show the number “2”.
1. Press the switch that is to have its load control
changed. The load control “ON TIME” for that
particular switch will be shown on the display.
An“On Time”must be programmed for selections
1,2, 3 and 4.
2. Use the UP/DOWN switches to change the load
control setting.
3. Press the “ENTER” switch to store the new load
control setting.
Button 4 Pressed:
The Time Base will show in the display.
NOTE: The Time Base should never be
changed unless directed to do so by
Corporate headquarters
1. Use the UP/DOWN switch to change the Time
Base.
2. Press the “ENTER” switch to store the new Time
Base.
Button 5 Pressed:
The Oset will show in the display
1. Use the UP/DOWN switches to change the Oset
value.
# Trays 1 2 3 4 5
Cook Time 6:00 6:00 6:00 6:00 6:00
Temperature 375° 375° 375° 375° 375°
On Time 60 80 130 160 160
Duty Cycle 160 160 160 160 160
Oset 0 0 0 0 0
Rack Position 2 1,3 1,2,3 1,2,3,4 1,2,3,4,5
A. PROGRAM PARAMETERS
This unit comes pre-programmed from the factory
with the following parameters for Menu items S1
and S2
Menu Item S1
Crazy Bread
CHANGING OVEN PARAMETERS
Switch To Change
1Cooking Time
2Cooking Temperature (Setpoint)
3 Duty Cycle On-Time
4 Duty Cycle Time Base
5 Oset
NOTE: Rack position is based on counting
from the top rung downward.

Electric Half-Size
Convection Oven Manual
10
NOTE: pressing the DOWN switch until the
display goes past zero (0) will be negative
values, and will be indicated by a lighted
COLON.
1. Press the “ENTER” switch to store the new Oset.
NOTE: The Oset is used as a means to
calibrate the probe temperature to agree
with the temperature in the center of the
oven. The factory setting for Oset is 30.
CONTROLLER RESET
In rare situations, such as a lightening strike near the
restaurant, the computer may lose its program, or
become “locked up”. If this should happen, press the
RESET switch to reset the computer, or turn the power
to the oven o and back on. Resetting the computer
re-synchronizes its program ow.
CHANGING OVEN PARAMETERS  continued

11
Electric Half-Size
Convection Oven Manual
OPERATIONS
CONTROL FAILURE DIAGNOSTICS
There are two types of failures that will shut down
the oven and display numbers that indicate the
cause of the trouble.
1. INTERNAL MEASUREMENT FAILURE
Should the controller’s temperature measurement
malfunction the following occurs:
a. The oven turns o automatically.
b. The alarm begins beeping
c. The display will show four (4) nines (9999)
To silence the alarm press one of the ve MENU
buttons.
Oven servicing by an authorized agent is required.
NOTE: The overridding backup mode can
be used in the interm.
2. INTERNAL TEMPERATURE MEASUREMENT
ISSUE
Should the oven stays ON over fteen (15)
minutes with the controller receiving an improper
temperature signal, the following occurs.
a. The oven turns o automatically.
b. The alarm begins beeping
c. The display will show four (4) sevens (7777)
To silence the alarm press one of the ve MENU
buttons.
Operation:
1. Turn power switch to o position. Push the toggle
switch located on the right access panel of the
oven to the up position.
2. Turn power switch clockwise to cook position. The
oven will now maintain a temperature of 375° by
the back up thermostat.
NOTE:You will need to manually time your
bake cycle until the Bread are baked. No
display will be illuminated.
Call your local authorized service agent to render
repairs as soon as possible.
COOL DOWN OPERATION
The oven has a cool down feature to expedite
cooling of the oven interior so that it can be cleaned.
To initiate the cool down feature, turn the power
switch counter clockwise to the off position. Open
door and turn the power switch counter clockwise
to the cool down positions. The oven fan will only
operate, circulating cool air in the oven cavity.
When the oven interior is cooled sufficiently, turn
the power switch clockwise to the off position.
Begin the daily cleaning procedures.
EMERGENCY BACKUP SYSTEM
Your oven is equipped with an emergency back-up
system to be used should the computer controller
ever malfunction.
NOTE: It is intended only to be used to
keep you in operation until a service
agent arrives to provide repairs.
OPERATION OF THE OVEN
Operation of the computerized Auto Rack Load
Controller is quite simple.
Preheat: Close oven door and turn power knob
clockwise to “cook” position.
The digital display will illuminate and display a
temperature of 212° (The minimum displayed
temperature). The amber light will also be lit
indicating the oven is heating. When the oven
temperature begins to exceed 212°, the actual
oven temperatures will be displayed until the
temperature set point has been reached and the
oven ready light has gone off. At this point, the
display shows 6:00 minutes, the cook time for one
tray.
Baking: Open door and quickly load trays(s). (Slide
tray all the way to the back wall, then slide forward
one inch). Close door and press the switch that
corresponds to the number of trays to be loaded
(1, 2, 3, 4 or 5)
The pressed switch will illuminate, indicating baking
has begun. The time displayed begins counting
down. When bake cycle is complete, the switch you
originally pressed will flash and the alarm sounds.
Press the flashing switch to turn off alarm. Remove
the product.

Electric Half-Size
Convection Oven Manual
12
DAILY CLEANING INSTRUCTIONS
1. Clean the porcelain interior using a degreasing agent. For heavier deposits a
commercial oven cleaner can be used.
2. Clean exterior painted surfaces with warm water and a mild detergent. Moisten a cloth
and wipe down the oven while it is COLD.
3. Make sure that all parts are thoroughly rinsed before returning to use.
4. Clean Stainless steel on the oven with a good stainless steel cleaner.
WEEKLY
The racks and rack supports can be removed and soaked in a solution of ammonia and
water. Make certain that all parts are thoroughly rinsed before returning to use.
THREE MONTHS
Check the door gasket seal on the oven and proofer for leaks. See the section on Door
Adjustments and Gasket Maintenance for help.
CLEANING
CLEANING THE OVEN
The stainless steel on your oven can be kept clean with a good stainless steel cleaner. Other surfaces should
be wiped clean regularly with MILD detergent. Moisten a cloth and wipe down the oven while it is COLD.
Wiping down an oven while hot will cause streaking and otherwise unsatisfactory results.
The porcelin oven interior should be cleaned routinely using a degreasing agent. For heavier deposits a
commerical ocen cleaniner should be used. Care musr be taken to prevent any alkaline-type cleaners from
coming in contact with the blower wheel.
The racks and rack supports can be removed and soaked in a solution o f amonia and water if cleaning is
required.
Male certain that all parts are thoroughly rinsed before returning to use.
Never steam clean or hose down with water. Electric component will
fail due to moisture. Failure to comply will void warranty.
Never steam clean or hose down with water. Electric component will
fail due to moisture. Failure to comply will void warranty.
Do not use causic cleaners, acids, ammonia products or abrasive
cleaners or cloths. These can damage the stainless steel and door
gaskets.

13
Electric Half-Size
Convection Oven Manual
B. DOOR ADJUSTMENT
The door switch is located behind the lower
front cover, on the right or left side. (Fig.1) The
door switch (A) is activated by a cam (B) which is
mounted to the door’s hinge pin with a set screw.
Position the door so it is nearly closed but not
latched. To adjust the cam:
• Loosen the set screw and rotate the cam
until you hear the switch click.
• Tighten the set screw in the cam.
• Test the door to make certain the switch will
make contact with the doors closed.
• Torque setscrew to 60 in-lbs.
• Replace the compartment cover.
MAINTENANCE INSTRUCTIONS
D. BACKUP THERMOSTAT CALIBRATION CHECK:
• Turn the oven on by turning the Power Switch to
the ON position.
• Open the doors and place a thermocouple in
the center of the middle oven rack. A reliable
mercury-type thermometer can be substituted if
a pyrometer is not available.
• Turn the power switch to the o position.
• Turn the thermostat dial to 375ºF (177ºC). Allow
the oven to preheat ½ hour.
• Note the maximum and minimum temperatures
through several cycles.
• If the reading on the pyrometer (or
thermometer) is less than 10ºF dierent from
the setting of the thermostat, no adjustment
is needed. If this reading is more than 10ºF,
proceed with calibration procedure.
To Recalibrate:
• Remove the thermostat knob by loosening the
setscrew and pull the knob forward. Take care
not to rotate the thermostat stem, which will
change the setting.
• With a very small screwdriver, turn the screw
located in the bottom of the hollow of the
stem clockwise to lower the temperature of
counterclockwise to raise the temperature. DO
NOT allow the stem of the thermostat to rotate
as your turn the screw.
Caution: Maximum turn of screw “A” is 1-1/2
turns – clockwise or counter-clockwiase.
This thermostat is a direct-acting (opens on
temperature rise) device.
Fig 1
A. ADJUSTMENTS
Quite often malfunctions which are attributed
to defects may be repaired by adjusting certain
parts rather than replacing them.
C. LUBRICATION
The door plunger assembly requires periodic
lubrication by the operator to ensure smooth,
trouble-free operation.
Application of a Food Grade High Temperature
Lubricant such as Lubriplate FGL-1 is recommended
at least bimonthly. Apply lubricant to the plunger
and strike plate sparingly. If necessary, lubricate at
more frequent intervals.

Electric Half-Size
Convection Oven Manual
14
Oven Not Heating
1. Oven heating lamp is o.
2. Digital display in the controller is not lit. (Make
sure backup thermostat control switch is in the
down position.)
3. Check the 24VAC from the transformer. If voltage
is present, replace the controller.
4. If no voltage, check the transformer and
transformer input voltage. Make certain the
correct transformer input voltage taps are used.
Transformer Primary Voltage
Orange 240-L1
Red 208-L1
White 120-L1
Black L2
Transformer Secondary Voltage
Yellow-blue 12V (pin 4 & pin3)
Yellow-blue 12V (pin 2 & pin3)
Yellow-yellow 24V (pin 4 & pin 2)
DIGITAL DISPLAY IN THE CONTROLLER IS LIT,
OVEN NOT HEATING
A simple test.
1. Turn the oven off.
2. Disconnect the oven control connector to J1 on
the PCB
3. Insert a short insulated jumper wire between
pins 1 and 3 in the oven control connector. Make
sure the wire is insulated and bare wire cannot
touch ground or other metal parts. (CAUTION:
Line voltage present.)
4. Turn the oven on.
5. If the oven heats up, turn the oven off, remove
the jumper from the oven control connector, and
replace the oven control connector. Check the
controller’s setpoint. If the setpoint is correct,
replace the controller.
6. If the oven does not heat up, the problem is
within the oven.
7. Turn the oven off.
8. Remove the jumper wire and replace the
connector.
9. Oven Heating Lamp is on.The problem is within
the oven.
OVEN TOO HOT OVEN STAYS ON
1. Turn the oven o.
2. Disconnect the oven control connector (J1)
3. Turn the oven on.
4. If the oven heats up, the problem is within the
oven.
5. If the oven does not heat up, turn the oven o, and
replacetheovencontrolconnectoronJ1,thenturn
the oven back on. Proceed to 6.
6. Press the ENTER switch to read the oven’s
temperature.
7. Indicated temperature is obviously less than it
should be.
8. The thermocouple cable may be shorted, or,
9. The controller may be defective.
10. Replace the temperature probe.
11. If the temperature now indicates the correct
temperature, the problem was the temperature
probe.
12. If the temperature still indicates lower than
expected, replace the controller.
TROUBLE SHOOTING

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Electric Half-Size
Convection Oven Manual
OVEN NOT RECOVERING WHEN BAKING
1. Check the Duty Cycle ON-TIME setting.
2. Measure the actual ON-TIME and OFF-TIME
with a stopwatch or use the second hand of a
wristwatch or clock to see if the oven is being
controlled properly.
3. If the oventurns on and o at the propertimes,
the fault is within the oven. Check amp draw
to each element. Be certain oven is supplied
with proper voltage. (240 volt elements on
208 volt power supply, for instance.)
4. If the oven does not turn on and o at the
proper times, replace the controller.
BREAD TOO DARK OVER BAKED
1. Reduce the duty Cycle ONTIME until the Bread
are the correct brownness.
BREAD TOO LIGHT OVER BAKED
1. IncreasetheDutyCycleON-TIMEuntiltheBread
are the correct brownness.
CONTROL FAILURE DIAGNOSTICS
There are two types of failures that will shut down the
oven and display numbers that indicate the cause of
the trouble:
1. TEMPERATURE PROBE OPENS
Should the controller’s probe/cable become an
open circuit following occur:
A. The oven is turned o
B. The alarm begins beeping
C. The display will show four (4) nines (9999)
Press one of the ve START switches to turn o
the alarm.
Replace the probe/cable.
2. OVEN STAYS ON TOO LONG
If the oven stays ON for over fteen (15) minutes,
and this ON condition is caused by the controller
receiving an improper temperature signal, the
following will occur.
A. The oven is turned o.
B. The alarm begins beeping
C. The display will show four (4) sevens (7777)
Press one of the START switches to turn o the
alarm.
Check the probe’s temperature by pressing the
ENTER switch. If the indicated temperature is
less than the actual oven temperature, the probe
cable is probably shorted, causing a second
thermocouple at a lower temperature. Replace
the thermostat probe/cable.
If the temperature shown in the display is about
the same as that of the oven’s, the problem is
probably the Controller. Replace the controller.
TROUBLE SHOOTING  continued

Electric Half-Size
Convection Oven Manual
16
MODEL 59E3P HALFSIZE ELECTRIC CONVECTION OVEN
REPAIR PARTS LIST
Item # Part # Description Item # Part # Description
1 156333 Mylar 17 155113 Support, rack, oven
2 153142 Knob, control 18 155114 Rack, oven
3 153204 Light, oven ready, 208v/240v 19 155404 Handle, door
4 153200 Holder, fuse 20 155451* door, with glass hinged right
5 153201 Fuse, 10 amp 155454 door, with glass hinged left
6 600541 Kit, 3 Position Switch, rotary 21 155132 Glass only
7 600536 Kit, Transformer, Ch/Pop, 208V 22 155107 Actuator, door switch
600537 Kit, Transformer, Ch/Pop, 240V
155995* Transformer, 480/240V 2kVA 23 148077 Switch, micro, door
8 600108 Controller 24 153056 Bearing, door
9 155304 Probe 25 155007 Gasket, door top
10 120001 Terminal block 26 155006 Gasket, door bottom
11 600539 Kit, Contactor,
DP-style TO IEC-style
27 155008 Gasket, door side (2)
12 153034 Motor, 208/240V, 1-speed 28 153416 Catch, door
13 153093 Fan Wheel 29 153801 Latch, roller assembly
14
155079 Element, outer, 240V, 2.667 kW 30 155318 Switch, toggle, back up system
155076 Element, outer, 208V, 2.667 kW 31 149403 Thermostat, backup
255256 Element, outer, 230V, 2.667 kW 32 153142 Knob, backup thermostat
15
155078 Element, center, 240V, 2.667 kW 33 153588 Overlay, backup thermostat
155075 Element, center, 208V, 2.667 kW 34 600100 Kit, Flue Guard (Optional)
255255 Element, center, 230V, 2.667 kW 35 155309* Harness, Electronic Panel
16
155077 Element, inner, 240V, 2.667 kW
155074 Element, inner, 208V, 2.667 kW
255254 Element, inner, 230V, 2.667 kW
• Not Shown
Diagrams of parts on following pages
READING THE SERIAL NUMBER

17
Electric Half-Size
Convection Oven Manual
MODEL 59E3L OVEN CONTROLS
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

Electric Half-Size
Convection Oven Manual
18
INTERIOR OVEN COMPONENTS
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19
Electric Half-Size
Convection Oven Manual
MODEL 59E3L
DOOR ASSEMBLY
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




OVEN BACKUP
THERMOSTAT SYSTEM
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

FLUE GUARD


Electric Half-Size
Convection Oven Manual
20
Duke Manufacturing Co.
2305 N. Broadway
St. Louis, MO 63102
Phone: [phone]
Toll Free: 1-800-735-3853
Fax: [phone] www.dukemfg.com