Dean D20 Series Guide

Dean, a member of the Commercial Food Equipment Service Association, recommends using
CFESA Certified Technicians.
Price: $15.00
24-Hour Service Hotline [phone]-5922
SEPTEMBER 2002
NON-CE &
Decathlon Series Gas Fryers
Service & Parts Manual
D20, D50, D60 & D80 Series

Please read all sections of this manual and retain for future reference.
This product has been certified as commercial cooking equipment and MUST be installed by
professional personnel as specified. Installation, maintenance and repairs should be performed
by your FRYMASTER FACTORY AUTHORIZED SERVICE CENTER.
DANGER
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any
other cooking appliance.
DANGER
Instructions explaining procedures to be followed MUST be posted in a prominent location in
the event the operator detects a gas leak. This information can be obtained from the local gas
company or gas supplier.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property
damage, injury or death. Read the installation, operating and maintenance instructions
thoroughly before installing or servicing this equipment.
DANGER
Safe and satisfactory operation of your equipment depends on proper installation. Installation
MUST conform with local codes, or in absence of local codes, with the National Fuel Gas Code,
ANSI Z223.1; The Natural Gas Installation Code, CAN/CGA-B149.1; The Propane Installation
Code, CAN/CGA-B149.2; or The latest edition of the National Electric Code, N.F.P.A. 70.
NOTICE
If, during the warranty period, the customer uses a part for this Enodis equipment other than an
unmodified new or recycled part purchased directly from Frymaster/Dean, or any of its
authorized service centers, and/or the part being used is modified from its original
configuration, this warranty will be void. Further, Frymaster/Dean and its affiliates will not be
liable for any claims, damages or expenses incurred by the customer which arise directly or
indirectly, in whole or in part, due to the installation of any modified part and/or part received
from an unauthorized service center.
DANGER
The crumb tray in fryers equipped with a filter system must be emptied into a fireproof container
at the end of frying operations each day. Some food particles can spontaneously combust if left
soaking in certain shortening material. Additional information can be obtained in the filtration
manual included with the system.

DANGER
The front ledge of the fryer is not a step. Do not stand on the fryer. Serious injury can result
from slips or contact with the hot oil.
WARNING
Drawings and photos used in this manual are intended to illustrate operational, cleaning and
technical procedures and may not conform to on-site management operational procedures.
WARNING
No structural material on the fryer should be altered or removed to accommodate placement of
the fryer under a hood. Questions? Call the Frymaster/Dean Service Hotline at 1-800-551-8633.
This equipment is to be installed in compliance with the basic plumbing code of The Building
Officials and Code Administrators International, Inc. (BOCA) and the Food Service Sanitation
Manual of the Food and Drug Administration.
COMPUTERS
FCC
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:
1) This device may not cause harmful interference, and 2) This device must accept any interference
received, including interference that may cause undesired operation. While this device is a verified Class
A device, it has been shown to meet the Class B limits.
CANADA
This digital apparatus does not exceed the Class A or B limits for radio noise emissions as set out by the
ICES-003 standard of the Canadian Department of Communications.
Cet appareil numerique n’emet pas de bruits radioelectriques depassany les limites de classe A et B
prescrites dans la norme NMB-003 edictee par le Ministre des Communcations du Canada.
DANGER
THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE
CANCER AND/OR BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.
Operation, installation, and servicing of this product could expose you to airborne particles of
glasswool or ceramic fibers, crystalline silica, and/or carbon monoxide. Inhalation of airborne
particles of glasswool or ceramic fibers is known to the State of California to cause cancer.
Inhalation of carbon monoxide is known to the State of California to cause birth defects or other
reproductive harm.
WARNING
Do not bang fry baskets or other utensils on the fryer’s joiner strip. The strip is present to seal
the joint between the fry vessels. Banging fry baskets on the strip to dislodge shortening will
distort the strip, adversely affecting its fit. It is designed for a tight fit and should only be
removed for cleaning.

Decathlon Series Gas Fryers
Service & Parts Manual
TABLE OF CONTENTS Page #
1. SERVICE PROCEDURES 1-1
1.1 Functional Description 1-1
1.2 Accessing Fryers for Service 1-7
1.3 Cleaning the Gas Valve Vent Tube (if applicable) 1-8
1.4 Adjusting Burner Manifold Gas Pressure 1-8
1.5 Adjusting the Pilot Flame 1-9
1.6 Calibrating the Thermatron Controller and Backup Thermostat 1-9
1.7 Replacing Fryer Components 1-11
1.8 Troubleshooting and Problem Isolation 1-30
1.9 Troubleshooting Guides 1-39
1.10 Wiring Diagrams 1-41
2. PARTS LIST 2-1
2.1 Decathlon D20 Primary Components 2-2
2.2 Decathlon D50 Primary Components 2-3
2.3 Decathlon D60 Primary Components 2-5
2.4 Decathlon D80 Primary Components 2-7
2.5 Control Panel Options, D60 Series 2-9
2.6 Optional Components and Controllers (CE and Domestic) 2-10
2.7 Transformers and Component Boxes- Multi-Batteried Decathlons 2-12
2.8 Oil Drain Manifold, Drain Flush and Drain Valve Components 2-13
2.9 Oil Return Manifold Components 2-15
2.10 Oil Return and Oil Flush Components 2-16
2.11 Under Fryer Filter (UFF) Components 2-18
2.12 Single Under Fryer Filter (SUFF) Components 2-20
2.13 Basket Lift Components (D50, D60 and D80 Series) 2-22
2.14 Trough, Holster and Cover Components- D60 and D80 Series 2-24

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-1
1.1 Functional Description
Decathlon Series gas fryers contain a welded steel frypot (stainless or cold-rolled) that is heated by
gas flames diffused evenly through tubes built into the frypot.
Flames originate from orifices in a burner manifold positioned beneath cast-iron burners. The
burners are positioned in the tube openings, at the front of the frypot. The diameter of the orifices
differs for natural (CE:G20/G25) and LP (CE:G31) gas as indicated in the accompanying table.
NON-CE (Altitudes of 2000 feet or less)
EQUIPMENT
PRESSURE
MODEL INPUT
(BTU) GAS TYPE
ORIFICE
MM
(INCH)
ORIFICE
PART NO. QTY MBAR INCH W.C.
D20G 50 NAT
LP 2.18(#44) 1.40(#54) 810-2050 810-2324 2 210 27.5 4 11
D50G 85 NAT
LP 2.08(#45) 1.32(#55) 14-0067-45 810-2441 4 410 27.5 4 11
D50G(HP) 120 NAT
LP 2.53(#39) 1.51(#53) 810-2048 810-2059 4 410 27.5 4 11
D50GDDHP 115 NAT
LP 2.44(#41) 1.51(#53) 14-0067-41 810-2059 4 410 27.5 4 11
D60G 112 NAT
LP 2.08(#45) 1.32(#55) 14-0067-45 810-2441 5 510 27.5 4 11
D60G(HP) 150 NAT
LP 2.53(#39) 1.51(#53) 810-2048 810-2059 5 510 27.5 4 11
D80G 122 NAT
LP 2.26(#43) 1.40(#54) 810-2049 810-2324 5 510 27.5 4 11
D80G(HP) 165 NAT
LP 2.58(#38) 1.61(#52) 810-2062 810-2063 5 510 27.5 4 11
CE ONLY (Altitudes of 2000 feet or less)
EQUIPMENT
PRESSURE
MODEL INPUT
(kW) GAS TYPE
ORIFICE
MM
(INCH)
ORIFICE
PART NO. QTY/ COLOR MBAR INCH W.C.
D20G 15,0 G20 G25
G31
2,40
2,40
1,51
810-2060
810-2060
810-2059
2/BLUE
2/BLUE
2/RED
10,0
15,0
27,0
4,0
6,0
10,8
D50G 30,0 G20 G25
G31
2,40
2,40
1,51
810-2060
810-2060
810-2059
4/BLUE
4/BLUE
4/RED
10,0
15,0
27,0
4,0
6,0
10,8
D60G 37,5 G20
G25
G31
2,40
2,40
1,51
810-2060
810-2060
810-2059
5/BLUE
5/BLUE
5/RED
10,0
15,0
27,0
4,0
6,0
10,8
D80G 37,5 G20 G25
G31
2,40
2,40
1,51
810-2060
810-2060
810-2059
5/BLUE
5/BLUE
5/RED
10,0
15,0
27,0
4,0
6,0
10,8

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-2
1.1 Functional Description (cont.)
An electromechanical gas valve regulates gas flow to the manifold. Decathlon Series gas fryers are
equipped with either a 120-volt valve system or a 24-volt valve system. Units may be configured
with either a pilot ignition system (standing pilot) or an electronic ignition system.
Pilot System Configuration
The pilot system is comprised of the pilot orifice, pilot hood, and a thermopile. The pilot serves two
purposes. The first is to light the burner, the second is to heat the thermocouple (some systems
incorporate a thermopile). In operation, the thermocouple is in contact with the pilot flame and
generates millivolts. The millivolt output energizes the gas valve pilot coil, which in turn opens the
pilot valve. If the pilot flame is extinguished, voltage is lost to the gas valve pilot coil and the pilot
valve closes. The gas valve is constructed so that the main valve will not open if the pilot valve is
not open. The pilot flame must be manually lit when the fryer is first placed into operation. A
separate 120-volt circuit, activated by the fryer ON/OFF switch, provides voltage through the
electronic thermostat controller to the gas valve main coil, which opens the main valve.
Electronic Thermostat
Controller
High-Limit
Thermostat
Line Voltage
Line Voltage
The Pilot System
120V
MELT CYCLE DISABLE
6 5
1
AC1
3
AC2 3A 2A
7 8 9
1A
EXT POT PROBE
10 11
2
COM
RELAY
NO
12 13
NC
14
Thermocouple/
Thermopile
Pilot Coil
Main Coil
Gas Valve
Pilot
ON/OFF
Switch
Electronic Ignition Configuration
In units configured for electronic ignition, an ignition module connected to an ignitor assembly
replaces the pilot system. The ignition module performs three important functions: it provides an
ignition spark, supplies voltage to the gas valve, and proofs the pilot flame.
The module contains a 60-second time delay circuit and a coil that activates the gas valve. The
ignitor assembly consists of a spark plug, a pilot, and a flame sensor element.

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-3
Electronic Ignition Configuration (cont.)
At start-up the ON/OFF switch is placed in the "ON" position, supplying 12 VDC to the heat control
circuitry in the controller or computer and to one side of the heat relay coil on the interface board. If
resistance in the temperature probe indicates the temperature in the frypot is below 180°F (82°C),
the current flows through a melt cycle circuit where a timer switch alternately closes for 3 seconds
and opens for 24 seconds. If the temperature is 180°F (82°C) or above, the current flows through a
heat circuit, bypassing the timer switch. In either case, current is supplied to the other leg of the heat
relay coil which then closes an electronic switch in the 24 VAC circuit to provide current to the
ignition module.
Circuitry in the ignition module sends 24 VAC current to the gas valve via a normally closed high-
limit switch and a drain safety switch. Simultaneously, the module causes the ignitor to spark for up
to 60 seconds to light the pilot flame. A flame sensor verifies that the pilot is lit by measuring the
flow of microamps through the flame. If the pilot does not light (or is extinguished), current to the
ignition module is interrupted, preventing the main valve from opening, and the ignition module
"locks out" until the power switch is turned "OFF", then back "ON".
A temperature probe monitors the temperature in the frypot. When the programmed setpoint
temperature is reached, resistance in the probe causes the heat cycle circuitry in the controller to
interrupt current flow through the heat relay. This in turn interrupts the 24 VAC current to the
ignition module, resulting in closure of the gas valve.
Control Options
Decathlon Series gas fryers may be equipped with operating thermostat controls (optional backup-
only; available with electronic thermostat or computer), electronic thermostat controller, or Compu-
Fry computers.
In fryers equipped with electronic thermostat controllers, the fryer is turned on and off by means of a
rocker switch and the temperature is set by adjusting a potentiometer. An interface board is located
in the component box (shield) behind the control panel (Compu-Fry equipped), or in a component
box inside the cabinet (electronic thermostat controller-equipped).
Interface Boards
The interface board provides a link between the controller/computer and the fryer’s individual
components without requiring excessive wiring, and allows the controller to execute commands
from one central point. Two types of interface boards may be used in Decathlon Series gas fryers;
the type used depends on the fryer configuration.
In units configured for electronic thermostat controllers, P/N 807-3566 (115V) or P/N 807-3722
(208/230V) is used; in units configured for Compu-Fry computers, P/N 806-4549 is used.

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-4
Interface Boards (cont.)
IFB 807-3566 (115V) & IFB 807-3722 (208/230V): These interface boards are used in electronic
thermostat controller-equipped Decathlon fryers.
MELT CYCLE DISABLE
6
5
1
AC1
3
AC2 3A 2A
789
1A
EXT POT PROBE
10 11
2
COM
RELAY
NO
12 13
NC
14
Not used
Line voltage enters the interface board at terminals 1 and 3. The temperature controls
(potentiometer) are connected to terminals 7, 8 and 9. The sensor probe circuit is connected to
terminals 10 and 11. The high-limit and gas valve routes through terminal 12. Terminals 2 and 13
are jumped out. Terminals 5 and 6 are the melt-cycle disable circuit. The melt cycle is enabled
unless terminals 5 and 6 are jumped out.
INTERFACE BOARD P/N 807-3566 & 807-3722

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-5
Interface Boards (cont.)
IFB 806-4549. This interface board is used in computer-equipped Decathlon fryers.
GND
GND
GND
GND
GND
V1D
PWR
ALR
V1S
V2D
PWR
AD
AS
V2S
SOUND
1
2
PWR
GV GV
PWR
4
8
12
14 13
9
5
1
K2
K4
4
6
87
5
3
21
K1
4
6
8
5
3
21
5
4
11
10
1
8
9
7
12
11
10
F1
4
8
12
14 13
9
5
1
K3
3
2
1
6
5
4
9
8
7
24V
12V AIR
3
2
1
612
2 Amp
J3
J1
Blower
Motor
3
GND
7
2
36
4
5
7
8
912
11
10 13
14
15
J2
Note position of
Pin 1 on J1. Note position of
Pin 1 on J3.
FREQUENTLY USED TEST POINTS FOR INTERFACE BOARD P/N 806-4549
Meter Test
Test Setting Pins Results
12VAC Power to Controller 50VAC Scale 1 and 3 on J3 12-18
24VAC Power to Right Module 50VAC Scale 8 on J3 and GROUND 22-28
24VAC Power to Left Module 50VAC Scale 8 on J1 and GROUND 22-28
12VDC Power to Right BL Relay 50VDC Scale 7 on J2 and 9 or 12 on J3 12-18
12VDC Power to Left BL Relay 50VDC Scale 9 on J2 and 9 or 12 on J1 12-18
24VAC Power to Right High-Limit 50VAC Scale 7 on J3 and GROUND 22-28
24VAC Power to Left High-Limit 50VAC Scale 7 on J1 and GROUND 22-28
120VAC Power* 250VAC Scale 11 on J3 and GROUND 110-125
120VAC Power To 120VAC Gas Valve* 250VAC Scale 10 on J3 and GROUND 110-125
Probe Resistance (Right)** R x 1000 Ohms 2 on J3 and 4 on J3 ***
Probe Resistance (Left)** R x 1000 Ohms 2 on J1 and 4 on J1 ***
*Where Applicable
** Disconnect 15-pin harness from controller before testing probe circuit.
*** See Probe Resistance Charts in this chapter.
INTERFACE BOARD P/N 806-4549

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-6
Interface Boards (cont.)
CURRENT FLOW THROUGH INTERFACE
BOARD 806-4549
2
5
8
11
J3
J2
1
2
4
5
6
7
8
9
10
11
12
13
14
15
2
5
11
J1
LEFT TWIN VAT SINGLE OR RIGHT TWIN-VAT
INTERFACE BOARD
12 VAC TO CPTR J3 PIN 3
GROUND GROUND
3
12 VAC RETURN J3 PIN 1
COMPUTER RT HT RELAY (K3)
COMPUTER LT HT RELAY (K2)
COMPUTER K4
NOT USED NOT USED
COMPUTER K1
RT ALARM OUT** ALR (RIGHT)
COMPUTER SOUND DEVICE
LT ALARM OUT* AD (LEFT)
COMPUTER J3 PIN 4
COMPUTER
COMPUTER J1 PIN 4
J1 PIN 2 & J3 PIN 2
J2 PIN 14 TEMP PROBE
24 VAC IN
AC COMMON
COMPUTER 12 VDC TO RELAYS
NOT USEDNOT USED
AC COMMON AC COMMON AC COMMON
PWR via K2
NOT USED NOT USED
J2 PIN 14TEMP PROBE
V2D
PWR
AD
AS
V2S
GND
V1D
PWR
ALR
V1S
GND
MOD 25V GROUND GROUND
MOD V2D
MOD 25V TERM
DRAIN SWITCH (OPT) J2 PIN 12
NOT USED NOT USED
NOT USED NOT USED
GROUND MOD 25V GROUND
J3 PIN 7 MOD V1D*
MOD 25V TERM
J3 PIN 8 via K2
DRAIN SWITCH (OPT)J2 PIN 10
MOD V1S**
*
* Twin Vat configurations
** Single Vat configurations
J3 PIN 7
J1 PIN 7
J1 PIN 8 via K1
12
K4 BASKET LIFT (UP)
10
AC Hot to 120VAC GV
7MAIN GAS VALVE 24VACV1S OR V1D via HLS
9
K4 BASKET LIFT (DN)
4
J2 PIN 13 TEMP PROBE
6
NOT USED NOT USED
1
J2 PIN 3 12 VAC XFMR PIN 12
3
J2 PIN 1 12 VAC XFMR PIN 11
3
NOT USED NOT USED
1NOT USEDNOT USED
6
NOT USED NOT USED
4
TEMP PROBE J2 PIN 15
9
BASKET LIFT (DN) K1
7
MAIN GAS VALVE V2D
via HLS
8
24 VAC IN PWR via K1
12
BASKET LIFT (UP) K1
10
NOT USED NOT USED MAIN GAS VALVE 120VAC
via HLS
The board contains two heat relays (K2 and K3), and two basket lift relays (K1 and K4).NOTE: On
factory-original units not equipped with basket lifts, the board will have no basket lift relays
installed. LEDs are provided to assist in troubleshooting.
P/N 806-4549 INTERFACE BOARD
LED DIAGNOSTIC LIGHTS
12V Indicates 12 VAC from transformer
24V Indicates 24 VAC from transformer
GV Indicates 24 VAC to gas valve
PWR Indicates 24 VAC to PWR via K1 (L) or K2 (R or F)
AIR Not Applicable to Decathlon Series Gas Fryers

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-7
Thermostats
Different types of thermostats are used in Decathlon Series gas fryers, depending on the fryers’
configuration.
Fryers equipped with an optional backup operating-thermostat/electronic thermostat controller: The
temperature is adjusted by changing the setting of the dial.
Fryers equipped with computer controls have a temperature probe. In this configuration, the probe
resistance varies directly with the temperature. That is, as the temperature rises, so does resistance at
a rate of approximately 2 ohms for every 1° (°F or °C). Circuitry in the computer monitors the probe
resistance and controls burner firing when the resistance exceeds or falls below programmed
temperatures (setpoints). The temperatures are programmed by means of a keypad on the face of the
computer.
All Decathlon Series gas fryers are equipped with a high-limit thermostat. In the event that the fryer
fails to properly control the oil temperature, the high-limit thermostat prevents the fryer from
overheating to flash point. The high-limit thermostat acts as a normally closed power switch that
opens when exposed to temperatures above 410°F [(210°C)- CE] to 450°F [(232°C)- non-CE]. CE
and non-CE high-limits are not interchangeable.
1.2 Accessing Fryers for Servicing
DANGER
Moving a fryer filled with cooking oil/shortening may cause spilling or splattering of
the hot liquid. Follow the draining instructions included with the fryer before
attempting to relocate a fryer for servicing.
1. Shut off the gas supply to the unit. Unplug the power cords. Remove any attached restraining
devices.
2. Disconnect the unit from the gas supply.
3. Relocate the fryer for service accessibility.
4. After servicing is complete, reconnect the unit to the gas supply, reattach restraining devices, and
plug in the electrical cords.

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-8
1.3 Cleaning the Gas Valve Vent Tube (if applicable)
1. Set the fryer power switch and the gas valve to the "OFF" position.
2. Carefully unscrew the vent tube from the gas valve. NOTE: The vent tube may be straightened
for ease in removal.
3. Pass a piece of ordinary binding wire (.052 inch diameter) through the tube to remove any
obstruction. Remove the wire and blow through the tube to ensure it is clear.
4. Reinstall tube and bend so that the opening is pointing downward.
1.4 Adjusting Burner Manifold Gas Pressure
WARNING
This task should be performed by qualified service personnel only.
1. Ensure that the gas valve knob is in the "OFF" position.
2. Remove the pressure tap plug from the gas valve (see arrows in photos below for location).
3. Insert the fitting for a gas pressure-measuring device into the pressure tap hole.
4. Place the gas valve in the "ON" position then place the fryer power switch in the "ON" position.
When the burner lights and continues to burn, note gas pressure reading for correct pressure in
accordance with the table on page 1-1.
5. To adjust burner gas pressure, remove the cap from the gas valve regulator and adjust to correct
pressure.
6. Place the fryer power switch and the gas valve in the "OFF" position. Remove the pressure-
measuring device fitting from the pressure tap hole and reinstall the pressure tap plug.
Non-CE Electronic Ignition
Valve
Pilot Ignition Valve (Line
Voltage)
CE Pilot Ignition Valve

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-9
1.5 Adjusting the Pilot Flame
1.5.1 Main Pilot
1. Remove the cap from the pilot adjustment screw hole on the gas valve.
2. Using a small, flat-tipped screwdriver, turn the pilot adjusting screw counterclockwise to
increase length of flame or clockwise to decrease length of flame. Adjust to obtain a flame from
1 inch to 1½ inches long.
3. Reinstall the pilot adjustment screw cap.
1.5.2 Trailing Pilot
1. Adjust the trailing pilot valve located on the burner manifold until a flame from 1 inch to 1½
inches long is obtained.
1.6 Calibrating the Electronic Thermostat Controller and Backup
Operating-Thermostat (optional)
1.6.1 Electronic Thermostat Controller
1. Fill the frypot to the lower OIL-LEVEL line with cooking oil/shortening. If solid shortening is
used, it must be melted before starting the calibration procedure.
2. Ensure the fryer ON/OFF switch is in the "OFF" position, then light the pilot.
3. Place the fryer ON/OFF switch in the "ON" position. Set the electronic thermostat dial to 325°F
(162°C).
4. Allow the oil/shortening to equilibrate at setpoint temperature. This is evident when the burners
have cycled on and off several times.
5. Insert a good grade thermometer or pyrometer into the frypot within 3 inches of the probe bulb.
Ensure the tip of the thermometer/pyrometer does not touch the frypot burner-tube.
6. If the temperature on the thermometer is higher or lower than 325°F (162°C), the knob is out of
calibration.
7. Calibrate the knob by first loosening the setscrew in the knob. After loosening setscrew, slowly
turn the knob to match the temperature reading of the thermometer. Tighten the setscrew,
ensuring the knob does not move on the shaft during tightening.
8. Allow burners to cycle on and off several times, then recheck oil temperature as described in step
#5. If the thermostat dial temperature matches the thermometer temperature, the thermostat is
calibrated. If not, repeat step #7.

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-10
1.6.1 Electronic Thermostat Controller (cont.)
9. After the calibration is complete, place the fryer power switch in the "OFF" position and
disconnect the fryer from the electrical supply.
1.6.2 Backup Thermostat (Optional)
1. Fill the frypot to the lower OIL-LEVEL line with cooking oil/shortening. If solid shortening is
used, it must be melted before starting the calibration procedure.
2. Light the pilot.
3. Set the temperature control knob to 350°F (177°C).
4. Let the burners cycle on and off automatically three times in order for the cooking oil/shortening
temperature to become uniform. If necessary, stir to get all shortening in the bottom of the
frypot melted.
5. Insert a good-grade thermometer or pyrometer probe into the oil/shortening, with the end near
the fryer temperature-sensing probe.
NOTE: The temperature-sensing probe is mounted on the frypot tube.
6. When the burner starts for the fourth time, the thermometer/pyrometer reading should be within
the range 335-360°F (168-182°C). If it is not, calibrate as follows:
a. Remove the thermostat knob by pulling straight out on the knob with a firm, steady pull.
The temperature adjusting screw is located in the middle of the thermostat shaft.
b. Insert a small-bladed flat-tipped screwdriver into the adjusting screw. Turn the adjusting
screw in ¼-turn increments to adjust the temperature. Turning the screw clockwise
decreases the temperature; turning it counter-clockwise increases the temperature. DO NOT
allow the thermostat shaft to turn while turning the adjusting screw.
c. Recheck the thermometer/pyrometer reading the next time the burner comes on.
d. Repeat steps 4.b. through 4.c. until the thermometer/pyrometer reading remains within the
range 335-360°F (168-182°C) through several cycles. If calibration cannot be obtained for
any reason, call a Factory Authorized Service Center for service.
e. Reinstall the thermostat knob.
7. Remove the thermometer or pyrometer.

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-11
1.7 Replacing Fryer Components
1.7.1 Replacing the Computer
1. Disconnect the fryer from the electrical supply.
2. Unscrew the two computer panel screws.
The computer panel is hinged at the bottom
and will swing open from the top.
3. Unplug the fryer wiring harness and ground
wire from the back of the computer.
4. Remove the computer by lifting it from the
hinge slots in the fryer control panel frame.
5. Reverse the procedure to install a new
computer.
Computer panel in “down” position.
Disconnect the 15-pin connector and ground
wire (arrows) from the computer.
Control panel frame with computer removed.

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1.7.2 Replacing the Backup Thermostat (if applicable)
1. Disconnect the fryer from the electrical supply.
2. Drain cooking oil/shortening from frypot.
3. Remove thermostat knob.
4. Disconnect the wiring plug(s)from the component shield/control box.
5. Disconnect leads from terminal block.
6. Remove screws securing the thermostat bracket to fryer.
7. Follow Steps 5-7 in Section 1.7.4 (Replacing the High-Limit Thermostat) to remove thermostat
from frypot.
8. Remove defective thermostat from the thermostat bracket and replace with a known good
thermostat. Use care not to damage the probe bulb and lead on the new thermostat.
9. Reverse the above steps to install the replacement.
CAUTION
The Backup Thermostat Control must be calibrated after installation is complete.
Refer to Section 1.6.2 for calibration instructions.

DECATHLON SERIES GAS FRYERS
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1.7.3 Replacing the Temperature Probe (Computer-Equipped Fryers)
1. Disconnect the fryer from the electrical supply.
2. Drain cooking oil/shortening from the frypot. Allow the frypot to cool completely before
proceeding.
3. Remove the fryer door for easier access to the
temperature probe. Lift door up, disengage
rod from lower door bracket, and then
remove door.
4. Disconnect the probe harness connector
(arrow). Use a pin pusher to remove plug
from probe wires (probe side only). Retain
the plug for re-assembly on new probe.
5. Remove the appropriate burners to gain
access to the temperature probe (see Steps
20-22 for more detail).
Remove door for easier access to temperature
probe.
Disconnect the two-pin probe harness connector
(arrow).
Remove burners to gain access to temperature
probe.

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
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1.7.3 Replacing the Temperature Probe (Computer-Equipped Fryers-cont.)
6. Loosen and unscrew completely the
compression nut, then the pass-through nut
from the frypot. Proceed to the next step
before removing probe from frypot.
Note: The temperature probe can be
removed through the top of the frypot as
follows: Ensure the two-pin connector has
been removed from the probe wiring harness
(step 4, this section). Remove the harness
insulation. The probe can be pulled through
the frypot from the top (complete step 7, this
section, prior to removing probe).
7. Remove probe bracket and probe spring from
probe inside frypot (bracket location and
configuration will vary according to fryer
model). Retain mounting hardware for
installation of new temperature probe.
8. Carefully remove the probe from the frypot.
As the probe is removed, tilt the probe at an
angle to facilitate removal (curved probes
only).
9. Reverse steps for installation of new probe.
IMPORTANT: When installing new probe,
ensure probe is positioned properly with the
mounting hardware installed prior to tightening
the compression nut. Once tightened, the probe
cannot be repositioned.
Loosen and unscrew completely the compression
nut (bottom arrow), then the pass-through nut (top
arrow).
First remove the probe bracket (two screws), then
the probe spring. Retain mounting hardware for
installation of new probe.
First remove the probe bracket (two screws), then
the probe spring. Retain mounting hardware for
installation of new probe.
Removing old probe from frypot. (Frypot removed
from fryer for clarity).

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1.7.4 Replacing the High-Limit Thermostat
1. Turn fryer off and drain cooking oil/shortening from the frypot. Allow the frypot to cool
completely before proceeding.
2. Perform steps 1-4 in Section 1.7.1, Replacing the Computer.
3. Remove fryer door for easier access (see Section 1.7.3, Step #3 for more detail).
4. Remove two screws securing the high-limit
mounting-bracket. Do not disconnect wires
from high-limit at this time.
5. Loosen and completely unscrew the
compression nut, then the pass-through nut
on the frypot bottom. Proceed to the next
step before removing high-limit from frypot.
Remove screws (arrows) securing high-limit to
fryer.
Compression nut unscrewed. Unscrew the pass-
through nut (arrow)

DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
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1.7.4 Replacing the High-Limit Thermostat (cont.)
6. Remove high-limit mounting bracket and
high-limit spring inside frypot. Retain
mounting hardware for installation of new
high-limit.
7. Carefully pull high-limit capillary tube and
bulb out of the frypot from the bottom.
Remove high-limit mounting hardware. Retain
mounting hardware for installation of new high-
limit. (Mounting hardware and location will vary
according to fryer model.)
Remove high-limit capillary tube and bulb from the
bottom of the frypot.