Frymaster 47 Series Guide

Frymaster, a member of the Commercial Food Equipment Service Association, recommends
using CFESA Certified Technicians.
Price: $12.00
819-5384
24-Hour Service Hotline [phone] MAY 2003
Service & Parts Manual

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
Improper installation, adjustment, alteration, service or maintenance can cause property
damage, injury, or death. Read the installation, operating, and service instructions thoroughly
before installing or servicing this equipment.
DANGER
For your safety, do not store or use gasoline or other flammable liquids or vapors in the vicinity
of this or any other appliance.
CAUTION
Instructions explaining procedures to be followed MUST
MUSTMUST
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.
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
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.
CAUTION
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.
CAUTION
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.
Frymaster fryers equipped with legs are for permanent installation. For moveable or portable
installation, Frymaster optional equipment casters MUST
MUSTMUST
MUST be used.
QUESTIONS? CALL 1-800-551-8633.

47 SERIES GAS FRYERS
TABLE OF CONTENTS
CHAPTER 1: Service Procedures..............................................................................................1-1
1.1 Functional Description.................................................................................................................1-1
Pilot System Configuration.............................................................................................................1-1
Electronic Ignition Configuration.....................................................................................................1-2
Control Options...............................................................................................................................1-3
Interface Boards .............................................................................................................................1-3
Thermostats....................................................................................................................................1-8
1.2 Accessing Fryers for Servicing ..................................................................................................1-8
1.3 Cleaning the Gas Valve Vent Tube .............................................................................................1-9
1.4 Adjusting the Burner Manifold Gas Pressure............................................................................1-9
1.5 Adjusting Ceramic Burner Target Spacing and Alignment....................................................1-11
1.6 Adjusting the Pilot Flame ..........................................................................................................1-11
1.7 Calibrating the Thermostat Control..........................................................................................1-12
1.8 Replacing Fryer Components ...................................................................................................1-13
1.8.1 Replacing the Controller or Computer..........................................................................1-13
1.8.2 Replacing the Thermostat............................................................................................1-13
1.8.3 Replacing the Temperature Probe ..............................................................................1-14
1.8.4 Replacing the High-Limit Thermostat in Fryers with Thermostat Controls ..................1-15
1.8.5 Replacing the High-Limit Thermostat in Fryers with Temperature Probes..................1-15
1.8.6 Replacing Control Panel Power Indicator Light in Fryers with Thermostat Controls...1-16
1.8.7 Replacing Power or Melt Cycle Switch in Fryers with Thermostat Controls................1-16
1.8.8 Replacing Ceramic Burner Targets..............................................................................1-17
1.8.9 Replacing the Gas Valve..............................................................................................1-18
1.8.10 Replacing the Pilot Assembly.......................................................................................1-18
1.8.11 Replacing Gas Valve High-Limit Thermostat Wire Adapter.........................................1-19
1.8.12 Replacing the Frypot....................................................................................................1-19
1.9 Troubleshooting and Problem Isolation ..................................................................................1-21
1.9.1 Ignition Failures............................................................................................................1-21
1.9.2 Improper Burner Functioning .......................................................................................1-22
1.9.3 Improper Temperature Control.....................................................................................1-24
1.9.4 Computer-Related Problems........................................................................................1-25
1.9.5 Filtration Problems .......................................................................................................1-26
1.9.6 Leaking.........................................................................................................................1-29
1.9.7 Modular Basket Lift Malfunctions.................................................................................1-29
1.9.8 Interpretation of Digital Controller Lights......................................................................1-31
1.10 Troubleshooting Guides............................................................................................................1-32
1.10.1 Initial Troubleshooting..................................................................................................1-32
1.10.2 Troubleshooting the 24 VAC Circuit: Electronic Ignition..............................................1-34
1.10.3 Troubleshooting the 24 VAC Circuit: Non-Electronic Ignition ......................................1-37
1.10.4 Troubleshooting the Temperature Probe.....................................................................1-39
1.10.5 Probe Resistance Charts .............................................................................................1-40
1.11 Wiring Diagrams.........................................................................................................................1-40

47 SERIES GAS FRYERS
TABLE OF CONTENTS
ii
CHAPTER 2: Parts List ..............................................................................................................2-1
2.1 Accessories...................................................................................................................................2-1
2.2 Burner Manifold Assemblies and Component Parts.................................................................2-2
2.3 Burner Ignition System Components .........................................................................................2-3
2.4 Gas Valve Assemblies and Connection Components ..............................................................2-4
2.5 Gas Manifold Assemblies ............................................................................................................2-5
2.6 Cabinet Assemblies and Component Parts ...............................................................................2-6
2.6.1 Door Assemblies and Component Parts ........................................................................2-9
2.7 Component Box/Shield Component Parts ...............................................................................2-10
2.8 Probes, High-Limits and Basket Lift Timers ............................................................................2-12
2.9 Operating Thermostat and Related Components....................................................................2-13
2.10 Computers and Controllers........................................................................................................2-14
2.11 Filter Base Assembly- FootPrint III Series................................................................................2-15
2.12 Filter Motors, Pumps and Related Components......................................................................2-16
2.13 Filter Pan Assembly- FootPrint III Series..................................................................................2-18
2.14 Oil Return Manifolds and Related Components ......................................................................2-19
2.15 Oil Return Valve Assembly ........................................................................................................2-20
2.16 Drain Manifold Assembly and Related Components ..............................................................2-21
2.17 Filter Component Box Assemblies ...........................................................................................2-22
2.18 Flue Assemblies and Related Components.............................................................................2-23
2.19 Frypot Assemblies and Related Components .........................................................................2-25
2.19.1 Frypot Components: Full-Vat........................................................................................2-25
2.19.2 Frypot Components: Dual-Vat......................................................................................2-27
2.20 Power Shower Components ......................................................................................................2-29
2.21 Drain Valve Components............................................................................................................2-30
2.21.1 Full-Vat Drain Valve Components ................................................................................2-30
2.21.1 Dual-Vat Drain Valve Components...............................................................................2-31
2.22 Modular Basket Lift Components..............................................................................................2-33
2.23 Gas Conversion Kits...................................................................................................................2-35

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-1
1.1 Functional Description
47 Series fryers contain a welded stainless steel frypot that is directly heated by gas flames that are
diffused evenly over its lower surface by ceramic targets.
In full-vat configurations, the flames originate from orifices in a U-shaped burner manifold
positioned beneath the frypot. In dual-vat configurations, the U-shaped manifold is replaced by a
pair of J-shaped manifolds, one for each vat. The diameter of the orifices differs for natural and LP
gas as indicated in the accompanying table.
47 Series Orifice Sizes
Gas Drill Size Millimeters
Natural 53 1.45
LP 65 0.86
An electromechanical gas valve regulates gas flow to the manifold(s). 47 Series fryers are equipped
with a 24-volt valve system. Units with thermostat controls are equipped with a pilot ignition
(millivolt) system. Units with other type controllers may be configured with either a pilot ignition
(millivolt) system 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 thermopile. In operation,
the thermopile is in contact with the pilot flame
and generates millivolts. The millivolt output
passes through a normally closed high-limit
switch and 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 24-volt
circuit, activated by the fryer ON/OFF switch,
provides voltage through the thermostat or
controller to the gas valve main coil, which opens
the main valve.
Controlling Thermostat
or
Controller
24 VAC
Transformer
High-Limit
Thermostat
Thermopile
Pilot Coil
Main Coil
Gas Valve
Line Voltage
Line Voltage
The Pilot System
ON/OFF
Switch
Pilot

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-2
1.1 Functional Description (cont.)
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 four important functions: it provides fuse
protection for the 24-volt circuit, provides an ignition spark, supplies voltage to the gas valve, and
proofs the pilot flame.
The module contains a 4-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.
TD
Out to
Gas Valve
To Alarm
25 V +
25 V GND
HV
Ignition Wire Flame Sensor
Coil
Inside the Ignition Module
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 4
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 cut, preventing the main valve from opening, and the ignition module "locks out" until the
power switch is turned "OFF", then back "ON".

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-3
1.1 Functional Description (cont.)
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 cut
off current flow through the heat relay. This in turn cuts off the 24 VAC current to the ignition
module, resulting in closure of the gas valve.
Control Options
47 Series fryers may be equipped with thermostat controls, solid-state analog controls, solid-state
digital controls, basket lift timers, or Computer Magic III computers.
In fryers equipped with thermostat controls, the fryer and melt cycle are turned on and off by means
of rocker switches and the temperature is set by means of a knob connected directly to the frypot-
mounted thermostat. These units have no interface board. In this type unit, once started, the melt
cycle will continue until it is manually turned off regardless of the temperature in the frypot. Fryers
equipped with other types of controllers have an interface board located in the component box
(shield) behind the control panel.
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 47 Series fryers; the type used
depends on the fryer configuration.
In units configured for electronic ignition, P/N 806-5857 is used; the other board is P/N 106-0386
(or 806-3398 in units built before October 2002). Each type is discussed in detail in the following
pages.
AL MV PV CMP PWR 24V PV MV AL
1
2
3
SOUND
15
14
1513
12 963
2
1
410
11
7
85J3
K1
HEAT
RELAY
K2
STANDING
PILOT
RELAY
K3
J2 J4
1
2
3
4
J5
AL
V1
GND
PWR
J1
1
2
3
4
AL
V1
GND
PWR
12 6 3 45
12 963
2
1
410
11
7
8 5
12 963
2
1
410
11
7
8 5
HEAT
RELAY
806-5857
K4
K1
SOUND
1
2
3
GND
GND
V2D
PWR
AD
AS
V2S
GND
GV
PWR
12V AIR
24V
PWR
GND
V1D
PWR
ALR
V1S
GV
GND
J2 GND
J3
3 6 9 12
2 5 8 11
1 4 7 10
J1
3 6 9 12
2 5 8 11
1 4 7 10
15
12963
14
11852
13
10741
K2 K3
D1
D2
D3
D4
D6 D7
Blower
Motor
2 Amp
D5
F2 Ignition
2 AMP Module
806-3398 and 106-0386

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-4
IFB 806-5857:The electronic ignition board contains two types of relays. Heat relays (K1 and K3)
operate at 12 VDC output from the controller. They switch 24 VAC to the main gas circuit when the
unit calls for heat. The middle relay (K2) switches 24 VAC to the pilot circuit when the unit is
powered up. The purpose of this relay is to allow the pilot to remain continuously lit.
AL MV PV CMP PWR 24V PV MV AL
1
2
3
SOUND
15
14
1513
12 963
2
1
410
11
7
85J3
K1
HEAT
RELAY
K2
STANDING
PILOT
RELAY
K3
J2 J4
1
2
3
4
J5
AL
V1
GND
PWR
J1
1
2
3
4
AL
V1
GND
PWR
12 6 3 45
12 963
2
1
410
11
7
8 5
12 963
2
1
410
11
7
8 5
HEAT
RELAY
INTERFACE BOARD 806-5857
FREQUENTLY USED TEST POINTS FOR INTERFACE BOARD P/N 806-5857
Test Meter Setting Pins Test Results
12VAC Power to Controller 50VAC Scale 1 and 3 on J3 12-18
24VAC Power to Right Module 50VAC Scale 4 on J5 and GROUND 22-28
24VAC Power to Left Module 50VAC Scale 4 on J1 and GROUND 22-28
12VDC Power to Right MBL Relay 50VDC Scale 7 on J3 and 9 on J4 12-18
12VDC Power to Left MBL Relay 50VDC Scale 9 on J3 and 6 on J2 12-18
24VAC Power to Right High-Limit 50VAC Scale 12 on J4 and GROUND 22-28
24VAC Power to Left High-Limit 50VAC Scale 3 on J2 and GROUND 22-28
Probe Resistance (Right)* R x 1000 Ohms 14 on J3 and 10 on J4 **
Probe Resistance (Left)* R x 1000 Ohms 14 on J3 and 1 on J2 **
High-Limit Continuity (Right) R x 1 Ohm 12 on J4 and Wire 13C on Gas Valve 0
High-Limit Continuity (Left) R x 1 Ohm 3 on J2 and Wire 12C on Gas Valve 0
* Disconnect 15-pin harness from controller before testing probe circuit.
** See Probe Resistance Charts in this chapter.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-5
The following table identifies the meaning associated with each of the LEDs arranged across the top
of the interface board. NOTE: In full vat units, ignore the left-side LEDs.
P/N 806-5857 INTERFACE BOARD
LED DIAGNOSTIC LIGHTS
AL Indicates ignition module lockout
MV Indicates 24 VAC to main gas valve
PV Indicates 24 VAC to pilot valve
CMP Indicates 12 VAC from transformer
24V Indicates 24 VAC from transformer
PWR Indicates 24 VAC to ignition module
CURRENT FLOW THROUGH INTERFACE
BOARD 806-5857
J5
1
2
3
4
5
6
7
8
9
10
11
12
J4
1
2
3
4
GROUND
12VAC XFMR PIN 12
24V XFMR PIN 8
PILOT VALVE
K3
J3 PIN 13
J5 PIN 2
MOD ALARM
MOD VALVE TERM
GROUND
J4 PIN 4 via K2
J3 PIN 10
J4 PIN 12
MOD 25V GROUND
MOD 25V TERM
J3 PIN 1
GROUND
J3 PIN 3
J5 PIN 4 via K2
K3
MAIN GAS VALVE
TEMP PROBE
TEMP PROBE
and PILOT VALVE
12VAC XFMR PIN 11
J4 PIN 7 via HLS, DSS,
J3 PIN 14
J3 PIN 7 BASKET LIFT
J3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
J4 PIN 1
GROUND
J4 PIN 3
COMPUTER
COMPUTER
J5 PIN 1
COMPUTER
COMPUTER
COMPUTER
12VAC TO CPTR
GROUND
12 VAC RETURN
RT HT RELAY (K3)
12VDC TO
RELAYS
CPTR-RT ALARM
SOUND DEVICE
J4 PIN 10
J4 PIN 11 & J2 PIN 2
COMPUTER J4 PIN 9
COMPUTER LT HT RELAY (K1)
COMPUTER J2 PIN 6
CPTR-LT ALARM J1 PIN 1
COMPUTER J2 PIN 1
NOT USED NOT USED
J1
1
2
3
4
5
6
7
8
9
10
11
12
J2
1
2
3
4
MOD ALARM
MOD VALVE TERM
GROUND
J4 PIN 4 via K2
J3 PIN 12
J2 PIN 3
MOD 25V GROUND
MOD 25V TERM
J3 PIN 15
TEMP PROBE
J3 PIN 14
TEMP PROBE
J1 PIN 2
J2 PIN 4 via HLS, DSS,
and PILOT VALVE
PILOT VALVE K1
K1
MAIN GAS VALVE
J3 PIN 9
BASKET LIFT
GROUND
GROUND
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED NOT USED
NOT USED
NOT USED
NOT USED
LEFT VAT FULL OR RIGHT VAT
INTERFACE BOARD
NOT USED NOT USED
NOT USED NOT USED

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-6
IFBs 806-3398 and 106-0386:The 47 Series of fryers has been in production for many years.
Consequently, servicers are likely to encounter three different interface board designs. Although the
boards differ slightly in appearance, basic functioning and electrical connections are the same from
one to another. In the earlier design 806-3398 interface board (used between June 1996 and July
1999), the diagnostic LEDs are arrayed in a row across the bottom of the board as shown in the left-
hand illustration below. In later design 806-3398 interface boards (and in the 106-0396 interface
boards that replaced them in current production fryers), the LEDs (labeled D1 though D7) are
scattered around the board as shown in the right-hand illustration. The primary difference between
the earlier design boards and the later design boards is the combining of the separate blower motor
relay (K4) and the heat relays (K1 and K2) into a pair of replaceable relays (K2 and K3) in the latter.
Also, the 106-0386 interface board has an additional fuse located in the upper right hand corner.
Prior to June 1996, a board with replaceable relays very similar in appearance to the 106-0386 board
was used. It is distinguished from the 106-0386 board by the absence of fuses. On full vat units, the
relay for the left vat (K1 in early 806-3398 IFBs or K2 in later design 806-3398 and 106-0386 IFBs)
is not present. On units with basket lifts, K3 and K5 (early 806-3398) or K1 and K4 are present.
NOTE: Although the printing on many boards indicates 2 Amp fuses, 3 Amp fuses (P/N 807-3843)
must be used.
K4
K1 K2
SOUND
1
2
3
GND
GND
V2D
PWR
AD
AS
V2S
GND
V1D
PWR
ALR
V1S
GND GV PWR AL 12V AIR 24V AL PWR GV GND
J2
EARLIER DESIGN INTERFACE BOARD P/N 806-3398
GND
12 6 3 45
J3
3 6 9 12
2 5 8 11
1 4 7 10
J1
3 6 9 12
2 5 8 11
1 4 7 10
15
12963
14
11852
13
10741
BLOWER
MOTOR
RELAY
K3 K5
HEAT
RELAY
HEAT
RELAY
K4
K1
SOUND
1
2
3
GND
GND
V2D
PWR
AD
AS
V2S
GND
GV
PWR
12V AIR
24V
PWR
GND
V1D
PWR
ALR
V1S
GV
GND
J2
LATER DESIGN INTERFACE BOARDS P/N 806-3398 and 106-0386
GND
J3
3 6 9 12
2 5 8 11
1 4 7 10
J1
3 6 9 12
2 5 8 11
1 4 7 10
15
12963
14
11852
13
10741
K2 K3
HEAT
RELAY
AND
BLOWER
MOTOR
RELAY
D1
D2
D3
D4
D6 D7
Blower
Motor
2 Amp
D5
HEAT
RELAY
AND
BLOWER
MOTOR
RELAY
F2 Ignition
2 AMP Module
This Fuse is NOT
present on 806-3398 IFB.
These standard interface boards are also used in a number of fryer types besides the 47 Series. The
information contained in this section applies to 47 Series applications ONLY.
Earlier design 806-3398 boards (used from June 1996 through July 1999) contain two heat relays
(K1 and K2) that switch 24VAC to the ignition and gas valve circuits when the computer/controller
heat logic circuit calls for heat. Relay K4 switches 120VAC to the blower motor when either K1 or
K2 closes. The relays on these boards are soldered on – if one fails, the whole board must be
replaced.
The later design 806-3398 (and 106-0386 boards that replaced them in current production fryers)
have only two relays. In this design, K2 and K3 are double-pole-double throw (dpdt) relays that
supply 24VAC to the ignition and gas valve circuits, as well as 120VAC to the blower motor. The
relays on this board plug into sockets. If a relay fails, it can be replaced.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-7
FREQUENTLY USED TEST POINTS FOR INTERFACE BOARDS P/N 806-3398 and 106-0386
Test Meter Setting Pins Test 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 MBL Relay 50VDC Scale 7 on J2 and 7 or 10 on J3 12-18
12VDC Power to Left MBL Relay 50VDC Scale 9 on J2 and 7 or 10 on J1 12-18
24VAC Power to Right High-Limit 50VAC Scale 9 on J3 and GROUND 22-28
24VAC Power to Left High-Limit 50VAC Scale 9 on J1 and GROUND 22-28
Probe Resistance (Right)* R x 1000 Ohms 2 on J3 and 6 on J3 **
Probe Resistance (Left)* R x 1000 Ohms 2 on J1 and 6 on J1 **
High-Limit Continuity (Right) R x 1 Ohm 9 on J3 and Wire 13C on Gas Valve 0
High-Limit Continuity (Left) R x 1 Ohm 9 on J1 and Wire 12C on Gas Valve 0
* Disconnect 15-pin harness from controller before testing probe circuit.
** See Probe Resistance Charts in this chapter.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-8
CURRENT FLOW THROUGH INTERFACE
BOARDS 806-3398 AND 106-0386
1
2
3
4
5
6
7
8
9
10
11
12
J3
J2 PIN 1
J2
1
2
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12
J1
LEFT
VAT FULL OR RIGHT VAT
INTERFACE BOARD
12 VAC TO CPTR J3 PIN 1
GROUND GROUND
3
12 VAC RETURN J3 PIN 3
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 6
COMPUTER
COMPUTER J1 PIN 6
J1 PIN 2 & J3 PIN 2
NOT USED NOT USED
NOT USEDNOT USED
NOT USED NOT USED
TEMP PROBE J2 PIN 15
BASKET LIFT (DN)
24 VAC IN
K1
MAIN GAS VALVE
BASKET LIFT (UP) K1
12 VAC XFMR PIN 11
J2 PIN 14 TEMP PROBE
J2 PIN 3 12 VAC XFMR PIN 12
NOT USED NOT USED
J2 PIN 13 TEMP PROBE
K4 BASKET LIFT (DN)
24 VAC IN
MAIN GAS VALVE
K4 BASKET LIFT (UP)
AC COMMON
NOT USED NOT USED
COMPUTER 12 VDC TO RELAYS
NOT USEDNOT USED
PWR via K1
V2D
NOT USED NOT USED
AC COMMON AC COMMON AC COMMON
PWR via K2
V1S OR V1D
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 9 MOD V1D*
MOD 25V TERM
J3 PIN 8 via K2
DRAIN SWITCH (OPT)J2 PIN 10
MOD V1S**
** Dual Vat
configurations
** Full Vat
configurations
via HLS via HLS
J3 PIN 9
J1 PIN 9
J1 PIN 8 via K1
Like the 806-5857 interface board, LEDs are provided to assist in troubleshooting. NOTE: In full
vat units, ignore the left-side LEDS.
P/N 806-3398 and 106-0386 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)
AL Indicates "open"Drain Safety Switch (if installed)
AIR Not Applicable to 47 Series Fryers
Thermostats
Different types of thermostats are used in 47 Series fryers, depending on the fryers’ configuration.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-9
Fryers equipped with Thermostat Controls have an adjustable controlling thermostat. The
temperature at which the thermostat opens and closes is adjusted by physically changing the setting
of the thermostat itself by means of an attached knob. The Fenwal controlling thermostat used in the
47 Series fryers is sensitive to one-degree changes in temperature.
CAUTION
Fenwal thermostats are used in a number of Frymaster products. The thermostat for
the 47 Series is 4 inches long. Do not use 3-inch Fenwal thermostats in 47 Series
fryers.
Fryers equipped with all other type 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 controller
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 controller.
All 47 Series 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
the flash point. The high-limit thermostat acts as a normally closed power switch that opens when
exposed to temperatures above 425°F to 450°F (218°C to 232°C). The different types of thermostats
have different part numbers for CE and Non-CE configured models, and 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. Disconnect the unit from the gas
supply.
2. Remove any attached restraining devices.
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.
1.3 Cleaning the Gas Valve Vent Tube
1. Set the fryer power switch and the gas valve to the "OFF" position.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-10
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.
4. Remove the wire and blow through the tube to ensure it is clear.
5. 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 accompanying tables.
Non-CE Electronic Ignition
Valve
Non-CE Pilot Ignition Valve CE Pilot Ignition Valve

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-11
Non-CE Standard
Burner Manifold Gas
Pressures
Gas Pressure
Natural 3.5" W.C.
0.8 kPa
LP 8.25" W.C.
2.5 kPa
Gas Pressure
(mbar)
Natural Gas Lacq
(G20) under 20 mbar 8
Natural Gas Gronique *
(G25) under 25 mbar 10
Propane
(G31) under 37 or 50 mbar 21
CE Standard
Burner Manifold Gas Pressures
* Belgian G25 = 7,0 mbar
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 fitting from
the pressure tap hole and reinstall the pressure tap plug.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-12
1.5 Adjusting Ceramic Burner Target Spacing and Alignment
DANGER
Drain the frypot or remove the handle from the drain valve before proceeding further.
Proper spacing of the top edge of the ceramic burner targets is ¾-inch (13 mm) from the frypot side.
To adjust target spacing, bend the brackets to which they are attached away or toward the frypot to
the proper distance. (A length of board of the proper thickness is useful as a gauge to verify spacing
and alignment.) Proper spacing of the rear ceramic burner target is 1 inch from the frypot back.
Frypot
¾-inch
(side)
1-inch
(rear)
1.6 Adjusting the Pilot Flame
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.
Master Jet
burner target
alignment.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-13
1.7 Calibrating the Thermostat Control
NOTE: The fryer control panel must be hinged down from the control panel mounting-frame to
perform thermostat calibration. In order to hinge the control panel down, the thermostat knob must
be removed from its shaft.
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. (Refer to Chapter
1 for detailed lighting instructions.)
3. Insert a good grade thermometer or pyrometer into the frypot so that it touches the thermostat
guard.
4. Disconnect the solid extension shaft from the end of the flexible shaft using an appropriately
sized Allen wrench.
5. Remove the flexible shaft from the thermostat shaft screw.
6. Place the fryer ON/OFF switch in the "ON" position.
NOTE: If the burner does not light at this time, it does not mean the thermostat is defective. Recheck
the wiring, and then slowly turn the thermostat adjusting screw counterclockwise until the burner
lights. Turning the adjusting screw counterclockwise causes the burner to light and clockwise
causes it to shut off.
7. When the cooking oil/shortening temperature reaches 325°F (162°C), turn the thermostat
adjusting screw slowly clockwise until the burner shuts off.
8. Allow the fryer to sit for a few minutes, then slowly turn the thermostat adjusting screw
counterclockwise until the burner lights.
9. Repeat steps 7 and 8 at least three times to ensure an accurate setting is obtained. The
Thermostat Control is considered to be properly calibrated if the burner lights as the cooking
oil/shortening cools to 325°F (162°C)—not when the burner shuts off as the temperature rises.
10. Once the calibration point of 325°F (162°C) is determined, allow the burner to cycle on and off
at least 3 times to be sure it will light at the calibrated temperature.
11. After the calibration is complete, place the fryer power switch in the "OFF" position and
disconnect the fryer from the electrical supply.
12. Carefully install the thermostat flexible extension on the thermostat shaft, ensuring that the
setscrews are tight.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-14
1.7 Calibrating the Thermostat Control (cont.)
CAUTION
The thermostat adjusting screw must not be moved while installing the flexible
extension shaft.
13. Install the solid metal extension shaft on the end of the flexible shaft with the stop pin at the 12
o’clock position. Ensure the stop pin and setscrews are tight to prevent slippage.
14. Reinstall and secure the fryer control panel. Loosen the temperature dial plate screws and rotate
the dial until the 325°F (162°C)-index mark is at the 12 o’clock position, then retighten the
screws.
15. Reinstall the thermostat knob with its pointer aligned with the 325°F (162°C)-index mark on the
temperature dial plate. Tighten the thermostat knob set screws to prevent slippage.
1.8 Replacing Fryer Components
1.8.1 Replacing the Controller or Computer
1. Disconnect the fryer from the electrical supply.
2. Unscrew the two control panel screws. The control panel is hinged at the bottom and will swing
open from the top.
3. Unplug the fryer wiring harness from the back of the controller/computer.
4. Remove the controller/computer by lifting it from the hinge slots in the fryer control panel frame.
5. Reverse the procedure to install a new controller/computer.
1.8.2 Replacing the Thermostat
1. Disconnect the fryer from the electrical supply.
2. Drain cooking oil/shortening below level of probe.
3. Remove thermostat knob. Remove the screws from the upper left and right corners of the control
panel. The control panel is hinged at the bottom and will swing open from the top.
4. Disconnect the wiring plug(s)from the component shield/control box.
5. Remove the control panel from the fryer by disengaging its tabs from the hinge slots in the
mounting frame.

47 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-15
1.8.2 Replacing the Thermostat (cont.)
6. Remove the solid extension shaft from the end of the flexible shaft using an appropriately sized
Allen wrench. Remove the flexible shaft from the thermostat shaft screw.
7. Disconnect leads from terminal block.
8. Unscrew the thermostat from the frypot and remove.
9. Apply Loctite™ PST567 thread sealant or equivalent to the replacement thermostat threads.
10. Reverse steps 1 through 8 to install the replacement.
CAUTION
The Thermostat Control must be calibrated after installation is complete. Refer to
Section 1.7 for calibration instructions.
1.8.3 Replacing the Temperature Probe
1. Disconnect the fryer from the electrical supply.
2. Drain cooking oil/shortening below level of probe.
3. Remove the screws from the upper left and right corners of the controller panel. The controller
is hinged at the bottom and will swing open from the top.
4. Unplug the wiring harness from the back of the controller and remove the controller from the
fryer by disengaging its tabs from the hinge slots in the mounting frame.
5. Remove two screws and nuts from the base of the interface board mounting-bracket.
6. Disconnect the 12-pin plug from the back of the interface board and lay the board in the left end
of the compartment with all other wires still connected.
7. Remove the 12-volt transformer from the component shield and lay it in the left end of the
compartment with wires still connected.
8. Using a pin-pusher, remove the temperature probe wires from the 12-pin plug disconnected in
step 7.
9. Unscrew the temperature probe from the frypot and remove.
10. Apply Loctite™ PST567 thread sealant or equivalent to new probe threads.
11. Reverse steps 1 through 10 to install replacement probe.