Frymaster GEN II LOV BIGLA30 Series User manual

BIGLA30 Series
LOV™ Gas Fryer
Service Manual
This manual is updated as new information and models are released. Visit our website for the latest manual.
This equipment chapter is to be installed in the Fryer Section of the Equipment Manual.
Part Number: FRY_SM_8196316 05/2015
*8196316*
FOR YOUR SAFET
Y
Do Not Store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.


NOTICE
IF, DURING THE WARRANTY PERIOD, THE CUSTOMER USES A PART FOR THIS MANITOWOC FOOD
SERVICE 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.
NOTICE
This appliance is intended for professional use only and is to be operated by qualified personnel only. A
Frymaster DEAN Authorized Service Agency (ASA) or other qualified professional should perform
installation, maintenance, and repairs. Installation, maintenance, or repairs by unqualified personnel may
void the manufacturer’s warranty.
NOTICE
This equipment must be installed in accordance with the appropriate national and local codes of the
country and/or region in which the appliance is installed. Refer to the operators manual.
NOTICE TO U.S. CUSTOMERS
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 U.S. Food
and Drug Administration.
NOTICE
Drawings and photos used in this manual are intended to illustrate operational, cleaning and technical
procedures and may not conform to onsite management operational procedures.
NOTICE TO OWNERS OF UNITS EQUIPPED WITH COMPUTERS
U.S.
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.
WARNING
To ensure the safe and efficient operation of the fryer and hood, the electrical plug for the 120-volt line,
which powers the hood, must be fully engaged and locked in its pin and sleeve socket.
DANGER
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.
NOTICE
The instructions in this manual for using a bulk oil system for filling and discarding oil are for an RTI
system. These instructions may not be applicable to other bulk oil systems.

WARNING
After installation of a gas fryer and after any maintenance to the gas system of a gas fryer-manifold, valve,
burners, etc. – check for gas leaks at all connections. Apply a thick soapy solution to all connections and
ensure there are no bubbles. There should be no smell of gas.
DANGER
Improper installation, adjustment, maintenance or service, and unauthorized alterations or modifications
can cause property damage, injury, or death. Read the installation, operating, and service instructions
thoroughly before installing or servicing this equipment. Only qualified service personnel may convert
this appliance to use a gas other than that for which it was originally configured.
DANGER
Adequate means must be provided to limit the movement of this appliance without depending upon the
gas line connection. Single fryers equipped with legs must be stabilized by installing anchor straps. All
fryers equipped with casters must be stabilized by installing restraining chains. If a flexible gas line is
used, an additional restraining cable must be connected at all times when the fryer is in use.
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.
DANGER
Do not store or use gasoline or other flammable liquids or vapors in the vicinity of this or any other
appliance.
DANGER
Instructions to be followed in the event the operator smells gas or otherwise detects a gas leak must be
posted in a prominent location. This information can be obtained from the local gas company or gas
supplier.
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.
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.
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.

i
BIGLA30 SERIES LOV™ GAS FRYERS
SERVICE MANUAL
TABLE OF CONTENTS
CHAPTER 1: Service Procedures
1.1 Functional Description...................................................................................................................................1-1
1.2 The Electronic Ignition System......................................................................................................................1-1
1.3 Interface Board...............................................................................................................................................1-2
1.4 Thermostats....................................................................................................................................................1-4
1.5 Accessing Fryers for Servicing......................................................................................................................1-4
1.6 Cleaning the Gas Valve Vent Tube................................................................................................................1-4
1.7 Checking the Burner Manifold Gas Pressure.................................................................................................1-5
1.8 Measuring Flame Current ..............................................................................................................................1-7
1.9 Replacing Fryer Components.........................................................................................................................1-7
1.9.1 Replacing the Computer or the Computer Wiring Harness..........................................................1-7
1.9.2 Replacing the Temperature Probe or High-Limit Thermostat......................................................1-8
1.9.3 Replacing the Interface Board......................................................................................................1-8
1.9.4 Replacing an Ignition Module......................................................................................................1-8
1.9.5 Replacing an Ignitor Assembly....................................................................................................1-9
1.9.6 Replacing or Cleaning a Combustion Air Blower........................................................................1-9
1.9.7 Adjusting the Air/Gas Mixture...................................................................................................1-10
1.9.8 Replacing a Gas Valve...............................................................................................................1-11
1.9.9 Replacing a Burner Assembly....................................................................................................1-12
1.9.10 Replacing the Filter Motor, Filter Pump, or Filter Pump...........................................................1-13
1.9.11 Replacing the Frypot..................................................................................................................1-13
1.9.12 Replacing Frypot Insulation and/or Upper Burner Rails............................................................1-14
1.10 Troubleshooting and Problem Isolation..........................................................................................................1-17
1.10.1 Heating (Ignition) Failure ..........................................................................................................1-18
1.10.2 Improper Burner Function..........................................................................................................1-18
1.10.3 Improper Temperature Control ..................................................................................................1-20
1.10.4 Computer Malfunctions .............................................................................................................1-20
1.10.5 Filtration Malfunctions...............................................................................................................1-20
1.10.6 Leakage......................................................................................................................................1-21
1.11 Troubleshooting Guides...............................................................................................................................1-21
1.11.1 Troubleshooting the 24 VAC Circuit.........................................................................................1-21
1.11.2 Troubleshooting the Gas Valve..................................................................................................1-23
1.11.3 Troubleshooting the Temperature Probe....................................................................................1-24
1.11.4 Replacing the Transformer or Filter Relay.................................................................................1-24
1.12 Probe Resistance Chart................................................................................................................................1-25
1.13 ATO (Automatic Top-Off ) Service Procedures..........................................................................................1-25
1.13.1 ATO (Automatic Top-Off Troubleshooting) .............................................................................1-25
1.13.2 ATO (Automatic Top-Off Troubleshooting) Board Pins and Positions.....................................1-27
1.13.3 Replacing the ATO Board or Transformer.................................................................................1-28
1.13.4 Replacing the ATO Pump or Solenoid.......................................................................................1-28
1.14 MIB (Manual Interface Board) Service Procedures.....................................................................................1-28
1.14.1 Manually Draining, Refilling or Filtering Using the MIB Board...............................................1-29
1.14.2 MIB (Manual Interface Board) Troubleshooting.......................................................................1-30
1.14.3 MIB (Manual Interface Board) Pin Positions and Harnesses.....................................................1-32
1.14.4 MIB (Manual Interface Board) Display Characters...................................................................1-33
1.14.5 Replacing the MIB Board ..........................................................................................................1-33
1.14.6 Control Power Reset Switch ......................................................................................................1-33
1.15 RTI Service Issues .......................................................................................................................................1-34
1.15.1 RTI MIB Tests...........................................................................................................................1-34
1.15.2 RTI LOV™ Wiring with RTI Switchbox ..................................................................................1-35
1.15.3 RTI Plumbing Schematic...........................................................................................................1-35
1.15.4 RTI LOV™ Test Quick Reference ............................................................................................1-36
1.16 AIF (Automatic Intermittent Filtration) Service Procedures........................................................................1-38
1.16.1 AIF (Automatic Intermittent Filtration) Troubleshooting..........................................................1-38
1.16.2 AIF (Automatic Intermittent Filtration) Actuator Board Pin Positions......................................1-39

ii
1.16.3 Replacing an AIF (Automatic Intermittent Filtration) Board.....................................................1-40
1.16.4 Replacing a Linear Actuator.......................................................................................................1-40
1.16.5 Replacing a Rotary Actuator......................................................................................................1-41
1.16.6 Oil Level Sensor.........................................................................................................................1-41
1.16.6.1 Oil Level Sensor Troubleshooting...........................................................................1-41
1.16.6.2 Oil Level Sensor Diagram.......................................................................................1-42
1.17 M3000 Computer Service Procedures..........................................................................................................1-42
1.17.1 M3000 Computer Troubleshooting...............................................................................................1-42
1.17.2 M3000 Useful Codes and Passwords............................................................................................1-45
1.17.3 Tech Mode ....................................................................................................................................1-45
1.17.4 Service Required Errors................................................................................................................1-46
1.17.5 Error Log Codes............................................................................................................................1-46
1.17.6 M3000 Filter Error Flowchart.......................................................................................................1-47
1.17.7 Clogged Drain/Failed Oil Sensor Flowchart.................................................................................1-48
1.17.8 M3000 Menu Summary Tree........................................................................................................1-49
1.17.9 M3000 Board Pin Positions and Harnesses...................................................................................1-50
1.18 Loading and Updating Software Procedures................................................................................................1-51
1.19 Principal Wiring Connections......................................................................................................................1-52
1.20 Wiring Diagrams..........................................................................................................................................1-53
1.20.1 Main BIGLA230........................................................................................................................1-53
1.20.1.2 Main BIGLA230 Australia.........................................................................................................1-54
1.20.2 Main BIGLA330........................................................................................................................1-55
1.20.2.2 Main BIGLA330 Australia.........................................................................................................1-56
1.20.3 Transformer / Filter Boxes.........................................................................................................1-57
1.20.3.1 BIGLA230 and 430 Transformer/Filter Box (Domestic)........................................1-57
1.20.3.2 BIGLA230 and 430 Transformer/Filter Box (International)...................................1-58
1.20.3.3 BIGLA330 Transformer/Filter Box (Domestic)......................................................1-59
1.20.3.4 BIGLA330 Transformer/Filter Box (International).................................................1-60
1.21 Simplified Wiring Diagrams........................................................................................................................1-61
1.21.1 BIGLA30 Series LOV™ Simplified Wiring with LON.............................................................1-61
1.21.1.2 BIGLA30 Series LOV™ Simplified Wiring without LON........................................................1-62
1.21.2 BIGLA30 Series LOV Data Network Flowchart.......................................................................1-63
1.22 Alternate Time Delay Relay Wiring Diagrams............................................................................................1-64
1.23 Solid /Semi-Solid Shortening.......................................................................................................................1-65
1.23.1 Shortening Melting Unit Wiring Diagram prior to Mar. 2012...................................................1-65
1.23.2 Shortening Melting Unit Wiring Diagram after Mar. 2012........................................................1-66
1.23.3 BIGLA230/430 120V/CE/Export Solid Shortening...................................................................1-67
1.23.4 BIGLA330 120V/CE/Export Solid Shortening..........................................................................1-68
1.24 Capable Control Ignition Module Wiring Diagrams....................................................................................1-69

1-1
BIGLA30 SERIES LOV™ GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1.1 Functional Description
BIGLA30 Series LOV™ gas fryers contain a welded stainless steel frypot that is directly heated by a high
efficiency infrared burner system, requiring approximately 43% less energy than conventional burners to cook
the same volume.
Self-contained combustion chambers (referred to as “burners”) are fitted into rails attached to the sides of the
frypot, one on each side. Each combustion chamber is fitted with special ceramic tiles that are heated by the
burning of a forced air/gas mixture. The tiles transfer heat to the frypot by means of infrared radiation,
providing much more constant and uniform heat dispersion over the surface of the frypot than do
conventional burners. Because less heat is lost to the atmosphere in the process, compared to “open-burner”
designs, less fuel is required to achieve and maintain a given frypot temperature.
In full-vat units, gas flow to both of the burners is regulated by one electromechanical gas valve. In dual-vat
units, each burner has its own valve. All fryers in this series are equipped with 24 VAC gas valve systems,
and all are configured with electronic ignition.
1.2 The Electronic Ignition System
An ignition module mounted below the component box (located
behind the control panel) is connected to an ignitor assembly at
the burner. 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 burner flame. The module contains a four second
time delay circuit and a coil that activates the gas valve. Three
types are in use. A closed-box design is used in most fryers, but
in some fryers built for export, the module resembles an
interface board. A single dual-spark module is used on current
production full-vat fryers. All dual-vat fryers use two single-
spark modules.
The ignitor assembly consists of a spark plug, an enrichment
tube, and a flame sensor.
At start-up, the power switch is placed in the ON position,
supplying approximately 12-volts DC to the heat-control circuitry in the computer and to one side of the heat
relay coils on the interface board. If resistance in the temperature probe indicates the temperature in the
frypot is below 180ºF (82ºC), the current flows through a melt cycle circuit where a timer switch alternately
closes for six seconds and opens for 24 seconds. If the temperature is 180ºF (82ºC) or above, the current
flows through a heat circuit, bypassing the timer switch. In either case, ground is supplied to the other leg of
the heat relay coils, which closes electronic switches in the 24 VAC circuit to provide current to the ignition
module. Circuitry in the ignition module sends 24 VAC to the gas valve via a normally closed high-limit
switch, and an oil level sensor which is controlled by electronics inside an egg shaped housing.
Simultaneously, the module causes the ignitor to spark for four seconds to light the burner. A flame sensor
verifies the burner ignition by measuring the flow of microamps through the flame. If the burner does not
light (or is extinguished), current to the ignition module is cut, the gas valve closes, and the ignition module
“locks out” until the power switch is turned off and then back on. A 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 computer to cut off current flow through the heat relay. This in turn cuts off the 24 VAC to
the ignition module, causing the gas valve to close.
Inside the Ignition
Module
TD
Out to Oil
Level Sensor
and Gas Valve
To Alarm
24 V +
GND
H
V
Ignition Wire Flame Sensor
Coil

1-2
1.3 Interface Board
All fryers in this series have an interface board located in the component box behind the control panel. The
interface board provides a link between the computer and the fryer’s individual components without requiring
excessive wiring, and allows the computer to execute commands from one central point.
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,
that relay can be replaced. K1 and K4 are single-pole-double throw (SPDT) relays that supply voltage to the
oil level relay sensors and relay board.
LEDs (labeled D1 through D7) are arrayed around the board to assist in troubleshooting.
K4
K1
SOUND
GND
V2D
PWR
AD
AS
V2S
GND
GV
PWR
12V
AIR
24V
PWR
GND
V1D
PWR
ALR
V1S
GV
GND
J2
SMT INTERFACE BOARD KIT 826-2264 (106-6706)
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
D5
HEAT
RELAY
AND
BLOWER
MOTOR
RELAY
F2 Ignition
3 AMP Module
J6
J7
J8
GND
GND
1
2
3
F1
Blower
Motor
3 AMP
OIL LEVEL
SENSOR
RELAY
OIL LEVEL
SENSOR
RELAY
D1 24 VAC to left gas valve (dual vat only)
D2 24 VAC to left ignition module (dual vat or CE)
D3 24 VAC from transformer
D4 24 VAC to right ignition module
D5 24 VAC to gas valve (right valve if dual vat)
D6 12 VAC from transformer
D7 CE and Japanese units only: air switch closed
INTERFACEBOARD
LED DIAGNOSTIC LIGHTS
NOTE: In full-vat fryers, the relay for the left side (K2) may not be present.
The chart on the following page illustrates current flow through the board, and the table at the top of page 1-4
identifies frequently used test points.
NOTE: Refer to Section 1.11.1 on
page 1-22 for troubleshooting
flowchart.

1-3

1-4
FREQUENTLY USED TEST POINTS FOR INTERFACE BOARD 106-6706
Meter
Setting
12VAC Power to Controller 50VAC Scale 1 and 3 on J3 or J2 12-18
24VAC Power to Right Module 50VAC Scale 8 on J3 and GROUND 22-28
24VAC Power to Left Module (if present) 50VAC Scale 8 on J1 and GROUND 22-28
120 VAC Power 250VAC Scale 11 on J3 and GROUND 110-125
120 VAC Power to Blowers 250VAC Scale 12 on J3 and GROUND 110-125
24VAC Power to Full- or Right-vat High-Limit 50VAC Scale 9 on J3 and GROUND 22-28
24VAC Power to Left High-Limit (if present) 50VAC Scale 9 on J1 and GROUND 22-28
Probe Resistance (Full- or Right-vat) * R x 1000 OHMS 2 and 6 on J3 or 13 and 14 on J2 **
Probe Resistance (Left - if present) * R x 1000 OHMS 2 and 6 on J1 or 14 and 15 on J2 **
Probe Isolation R x 1000 OHMS 6 on J1 or J3 and GROUND ***
High-Limit Continuity (Full- or Right-vat) R x 1 OHM 9 on J3 and Wire 13C on Gas Valve 0
High-Limit Continuity (Left - if present) R x 1 OHM 9 on J1 and Wire 12C on Gas Valve 0
** See Probe Resistance Chart at end of chapter.
*** 5 mega-Ohms or greater.
Test Pins Results
** Disconnect 20-pin harness from controller before testing probe circuit.
1.4 Thermostats
BIGLA30 Series LOV™ gas fryers have temperature probes located on the front centerline of each frypot
(dual-vat frypots have two probes, one in each vat). In this type of thermostat, 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 1º F. Circuitry in the computer monitors the probe resistance and controls burner firing when
the resistance exceeds or falls below programmed temperatures (setpoints).
BIGLA30 Series LOV™ gas fryers are also 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 425ºF to 450ºF (218ºC to 232ºC). The different types of thermostats have different part
numbers for CE and Non-CE models, and are not interchangeable.
1.5 Accessing Fryers for Servicing
DANGER
Moving a fryer filled with oil may cause spilling or splattering of the hot liquid. Follow
the draining instructions in section 4.10.4 on page 4-16 in Chapter 4 of the BIGLA30
Installation and Operation Manual (P/N 819-6286) 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 and relocate the fryer for service accessibility.
3. After servicing is complete, reconnect the unit to the gas supply, reattach restraining devices, and plug in
the electrical cords. NOTE: To ensure the safe and efficient operation of the fryer and hood, the
electrical plug for the 120-volt line, which powers the hood, must be fully engaged and locked in its
pin and sleeve socket.
1.6 Cleaning the Gas Valve Vent Tube
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 of
removal.
3. Pass a piece of ordinary binding wire (.052 inch diameter) through the tube to remove any obstruction.

1-5
4. Remove the wire and blow through the tube to ensure it is clear.
5. Reinstall the tube and bend it so that the opening is pointing downward.
1.7 Checking the Burner Manifold Gas Pressure
1. On non-CE fryers only ensure that the gas valve knob is in the OFF position.
Honeywell
ON
OFF
2. Remove the pressure tap plug from the gas valve assembly.
Typical Non-CE
Valve Assembly
Typical CE Valve
Assembly
Pressure Tap Plug
3. Insert the fitting for a gas pressure-measuring device into the pressure tap hole.
4. On non-CE fryers only, place the gas valve in the ON position
5. Place the fryer power switch in the ON position. When the burner has lit and burned steadily for at least
one minute, compare the gas pressure reading to the pressure for the corresponding gas in the appropriate
table on the following page. The tables list the burner manifold gas pressures for each of the gas types that
can be used with this equipment.

1-6
Gas Single
Vat Dual Vat
Natural Gas Lacq
(G20) under 20 mbar 77
Natural Gas Gronique *
(G25) under 25 mbar 10 10
Natural Gas Gronique
(G25) under 20 mbar 10 10
Butane/Propane
(G30) at 28/30 or 50 mbar 17 17
Propane
(G31) under 37 or 50 mbar 20 20
CE Standard
Burner Manifold Gas Pressures
Pressure (mbar)
* Belgian G25 = 7,0 mbar (single or dual)
Gas Pressure
Natur al 3" W.C.
0.73 kPa
Propane 8.25" W.C.
2.5 kPa
Non-CE Standard
Burner Manifold Gas Pressures
6. To adjust the burner gas pressure, remove the cap from the gas valve regulator and adjust to the correct
pressure.
Non-CE
Valve
CE
Valve
GAS VALVE REGULATOR CAP
7. Place the fryer power switch (and the gas valve in non-CE fryers) in the OFF position. Remove the fitting
from the pressure tap hole and reinstall the pressure tap plug.
1.8 Measuring Flame Current
When the burner flame is properly adjusted, it will produce a current between 1.5 A and 2.5 A. Flame
current is measured by placing a microamp (not milliamp) meter in series with the sensing wire on the ignitor.
This is accomplished as follows:
1. Place the fryer power switch in the OFF position.

1-7
2. Disconnect the sensing wire from one of the burner ignitors and connect it to the positive lead of the meter.
Connect the negative lead of the meter to the terminal from which the sensing wire was removed.
3. Place the fryer power switch in the ON position to light the burners. After the frypot temperature reaches
200F (93C), wait at least one minute before checking the reading. NOTE: The closer the unit is to
normal operating temperature, the more accurate the reading will be.
1.9 Replacing Fryer Components
1.9.1 Replacing the Computer or the Computer Wiring Harnesses
1. Disconnect the fryer from the electrical power supply.
2. The computer bezel is held in place by tabs at the top and bottom. Slide the metal bezel up to disengage the
lower tabs. Then slide the bezel down to disengage the upper tabs.
3. Remove the two screws from the upper corners of the computer. The computer is hinged at the bottom and
will swing open from the top.
4. Unplug the wiring harnesses from the connectors on the back of the computer marking their position for
reassembly and disconnect the grounding wires from the terminals. Remove the computer by lifting it from
the hinged slots in the control panel frame.
5. Install the replacement computer. Reinstall the control panel assembly by reversing steps 1 thru 4.
6. Setup the computer following the instructions on page 4-9 in the Installation and Operation manual. Setup
MUST be performed prior to readdress.
7. Once setup is complete on all replaced computers, CYCLE POWER TO ENTIRE FRYER SYSTEM. See
section 1.14.6 to reset control power.
8. Check software version and if necessary update the software. If a software update was necessary, follow
the instructions to update the software in section 1.18.
1.9.2 Replacing the Temperature Probe, ATO Probe, AIF Probe, Oil Level Sensor or
High-Limit Thermostat
1. Disconnect the fryer from the electrical supply.
2. Drain cooking oil below the level of the probe or thermostat.
3. Lift up on the bezel to disengage the tabs on its lower edge from the control panel frame.
4. Remove the top two screws in the upper corners of the computer.
5. Swing the computer out from the top and allow it to rest on its hinge tabs.
6. Disconnect the computer wiring harness and ground wire from the back of the computer and remove the
computer by lifting it from the hinge slots in the control panel frame.
7. Disconnect the ignition cables from the ignitors by grasping the boots and gently pulling toward you.
8. Disconnect the flame sensor wires from the flame sensors.
9. Disconnect the sound device lead from the interface board.
Flame Sensor Wire
Ground Wire Terminal
20-Pin Connecto
r
Ground Wire Terminal
Communication Wires
Locator Wire

1-8
10. If working on the left frypot, cut the wire tie on the wiring bundle and disconnect the main wiring harness
15-pin connector.
11. Remove the component box mounting screws.
12. Rotate the top of the component box out of the frame and carefully pull it out enough to disconnect the
wiring harness plug from the back of the box. This will leave one set of wires, enclosed in spiral wrap,
connected to the component box.
13. Remove the box and set it atop the fryer to expose the temperature probe and high-limit thermostat.
14. Unscrew the probe or thermostat from the frypot.
15. Apply Loctite®PST56765 pipe thread sealant or equivalent to the replacement part threads and screw the
replacement part into the frypot, torquing to 180 inch-pounds.
16. Connect the wires from the new component as follows:
a. If replacing a probe, use a pin pusher to disconnect (one at a time) the red and white leads from the
connector and insert the corresponding leads from the new probe into the plug.
b. If replacing the high-limit thermostat, use a pin pusher to disconnect the lead running to the connector
and insert the corresponding lead from the new thermostat.
c. Reverse steps 1 through 13 to complete the procedure.
1.9.3 Replacing the Interface Board
1. Perform steps 1 through 4 from section 1.9.1.
2. Disconnect the wires attached to the interface board, marking or making a note of the wires and terminals to
facilitate reconnection.
3. Remove the nuts at each corner of the interface board and carefully pull it from the studs far enough to
allow the connector on the back of the board to be disconnected, then remove the board from the box.
When removing the board, be careful not to lose the spacers that fit over the studs behind the board.
4. Recover the relay(s) from the failed interface board and install on the replacement board.
5. Reverse the procedure to install the replacement board, being sure that the spacers behind the board are in
place and the computer locator wire is attached to a stud.
1.9.4 Replacing an Ignition Module
1. Disconnect the fryer from the electrical supply.
2. Lift up on the bezel to disengage the tabs on its lower edge from the control panel frame.
3. Remove the top two screws in the upper corners of the computer.
4. Swing the computer out from the top and allow it to rest on its hinge tabs.
5. Loosen the nuts attached to the screws of the module. Slide the module towards the rear of the component
box until the nuts drop through the keyholes.
6. Carefully rotate the module and pull forward. On some units it may be necessary to remove the blower.
7. Disconnect the wires from the ignition module, marking or making a note of the wires and terminals to
facilitate reconnection.
8. Remove the screws from the module.
9. Move the screws and spacers to the new module.
10. Reverse the procedure to install the replacement module.
1.9.5 Replacing an Ignitor Assembly
DANGER
Drain the frypot before proceeding further.
1. Disconnect the fryer from the electrical supply.
2. Disconnect the flame sensor wire by carefully pulling its push-on terminal from the terminal strip on the
ignitor. Disconnect the gas enrichment tube at the ignitor-end compression fitting. Disconnect the ignition
cable from the ignitor by grasping its boot and gently pulling toward you. (See photo on the next page)

1-9
3. Remove the sheet metal screws securing the ignitor to the mounting plate and pull the ignitor from the fryer.
4. Reverse the procedure to install the replacement ignitor.
1.9.6 Replacing or Cleaning a Combustion Air Blower
1. Disconnect the blower wiring harness, remove the blower assembly mounting nuts, and remove the blower
assembly from the fryer. If cleaning the motor, continue with Step 2; otherwise, install the replacement
blower, reconnect the wiring harness, and then go to Step 6.
2. Remove the blower motor shield and separate the blower motor from the housing as shown in the
illustration below.
Remove these screws to
remove the shield from the
blower assembly.
Remove these nuts to
separate the blower
motor from the housing.
3. Wrap the motor with plastic wrap to prevent water from entering it. Spray degreaser or detergent on the
blower wheel and the blower housing. Allow it to soak for five minutes. Rinse the wheel and housing with
hot tap water, then dry with a clean cloth.
NOTICE- Australia Only
The air pressure switch on the combustion blower should read: Full Vat units-122pa
(0.5 inches W.C.) and for Split Vat units-180pa (0.72 inches W.C.).
Wiring connection
Blower assembly
mounting nuts
Flame Sensor Wire
Gas Enrichment Tube
Ignition Cable

1-10
Blower Housing
Blower Wheel
Wrap the motor and wires
with plastic wrap or a
plastic bag.
4. Remove the plastic wrap from the blower motor assembly. Reassemble the blower motor assembly and
blower housing. Reinstall the blower shield.
5. Reinstall the blower assembly in the fryer and reconnect the wiring disconnected in Step 1.
6. Light the fryer in accordance with the procedure described in Chapter 3, Section 3.1.2 of the BIGLA30
Series LOV™ Gas Fryer Installation and Operation Manual (P/N 819-6286).
7. After the burners have been lit for at least 90 seconds, observe the flames through the burner viewing ports
located on each side of the combustion air blower.
The air/gas mixture is properly adjusted when the burner manifold pressure is in accordance with the
applicable table on page 1-6 and the burners display a bright orange-red glow. If a blue flame is observed
or if there are dark spots on a burner face, the air/gas mixture requires adjustment.
NOTE: Opening the air shutter too much may result in whistling. It should not be more
than 1/3 open.
1.9.7 Adjusting the Air/Gas Mixture
On the side of the blower housing opposite the motor is a shutter plate with a locking nut. Loosen the nut
enough to allow the shutter to be moved, then adjust the position of the shutter to open or close the air intake
opening until a bright orange-red glow is obtained, then close it slightly. Carefully hold the shutter in position
and tighten the locking nut (see illustration on the following page).
Right
Viewing Port is
behind motor.
Left Viewing
Port.

1-11
1.9.8 Replacing a Gas Valve
1. Disconnect fryer from electrical and gas supplies.
2. Disconnect the drain safety and high-limit thermostat wires from the gas valve. Mark each wire to facilitate
reconnection.
3. Remove the vent tube (on non-CE fryers) and the enrichment tube fitting from the valve. Disconnect the
flexible gas line(s).
If replacing the left-most valve on any configuration, or the right valve on a two-fryer battery, follow the
instructions below. If replacing valves in other positions, skip to “ALL OTHER VALVES.”
A. Remove the filter pan from the unit. Remove the door adjacent to the valve being replaced.
B. Remove the screws on that attach the pan rails adjacent to the valve being replaced.
C. Uncouple the pipe union and remove the gas valve and associated piping from the unit.
D. Remove the fittings and associated piping from the failed valve and install them on the replacement valve
using Loctite®PST56765 or equivalent pipe thread sealant.
E. Reconnect the gas valve assembly to the fryer using Loctite®PST56765 or equivalent pipe thread sealant,
and reattach the flexible gas line(s), enrichment tube(s), and the vent tube (on non-CE units). Reconnect the
high-limit thermostat wires and drain safety wires to the valve.
F. Reconnect the fryer to the gas supply and open the cut off valve. Apply a thick soapy solution of soapy
water around each connection to check for gas leaks and ensure there are no bubbles. Eliminate any that are
found. There should be no smell of gas.
G. Position the pan rail assembly beneath the fryer and rest the rear end of the rail on the cabinet frame. Install
the two nuts and bolts behind the front face of the rail, but do not tighten them. Install the nut and bolt at
the rear end of the filter rail and tighten securely.
H. Reattach the screws for the pan rails. Install the filter pan in the unit to make sure that all components are
properly aligned.
I. Reconnect the fryer to the electrical power supply and check for proper operation. When proper operation
has been verified, reinstall the door removed in Step A.
ALL OTHER VALVES
4. Carefully unscrew the valve from the manifold. NOTE: Some models may have the valve attached to the
manifold by means of a pipe union. In such cases, remove the valve by uncoupling the union.
5. Remove all fittings from the old gas valve and install them on the replacement valve, using Loctite®
PST56765 or equivalent pipe thread sealant.
6. Reconnect the gas valve assembly to the fryer using Loctite®PST56765 or equivalent pipe thread sealant,
and reattach the flexible gas line(s), enrichment tube(s), and the vent tube (on non-CE units). Reconnect the
high-limit thermostat wires and drain safety wires to the valve.
7. Reconnect the fryer to the gas supply and open the cut off valve. Apply a thick soapy solution of soapy
water around each connection to check for gas leaks and ensure there are no bubbles. Eliminate any that are
found. There should be no smell of gas.
8. Reconnect the fryer to the electrical power supply and check for proper operation.
On non-CE blowers loosen
this nut and rotate shutter
to open or close air intake.
On CE blowers loosen both
wing nuts and slide the
shutter to adjust the air
intake.

1-12
Figure 3
Figure 1
Figure 2
1.9.9 Replacing a Burner Assembly on fryers built after Oct, 2010. For replacement of
burners prior to that call the factory.
1. Disconnect the unit from the electrical and gas supplies.
2. Remove the gas line and enrichment tube using a 7/16” and 5/8” wrench from the front of the burner. It
may be necessary to remove the MIB board in some locations.
3. Remove the elbow and tee off the bottom of the burner to ensure easier
removal of the burner.
4. Remove the fryer back.
5. Remove the screws attaching the flue cap to the brace.
6. Remove the top cross brace in the back.
7. Remove the flue by removing the two screws in the rear and one screw in
the front of the flue.
8. Remove all the screws on the flue collector and bend back the tabs and remove the
collector.
9. Remove four screws on the collector insulation plate (see Figure 1).
10. Remove the four nuts and cover of the lower insulation retaining cover (see Figure
2).
11. Carefully remove the insulation being careful not to damage it.
12. Grasp the burner firmly and slide the burner out the rear of the fryer. Pull it toward
you until it clears the burner channels, taking care not to damage the ceramic tiles in
the process.
13. Slide the burner out the rear of the fryer.
14. Clean all debris from the burner channels and combustion area.
15. Inspect the upper and lower burner rails for cracked or burned out welds.
a. If the welds in the lower rail are cracked or burned out, the frypot must be
replaced. Refer to Section 1.9.11 for procedure.
b. If the welds in the upper rail are cracked or burned out, the upper rail must be
replaced. Refer to Section 1.9.12 for procedure.
16. Wrap a new insulating strip along the top, rear, and bottom edge of the burner.
NOTE: Use P/N 826-0931 for full-vat frypots and P/N 826-0932 for dual-vat
frypots.
17. Carefully slide the replacement burner into the rails starting at the top and lifting
slightly up on the bottom (see Figure 3). Ensure that the insulation is not torn or
damaged.
18. In reverse order reassemble insulation and holding plates.
19. Install flue collector.
20. Install the flue.
21. Install the cross brace ensuring the flue cap is secured to the brace.
22. Replace the fryer back.
23. Reattach the elbow, gas line and enrichment tubes to the front of the burner.
24. Fill the frypot with oil. Turn the fryer on, turn off or bypass the melt cycle, and operate the unit for at least
10 minutes.
25. Visually examine the burner flame. The color and intensity on both sides should be the same.
26. Use an inspection mirror to check for leaks in areas that cannot be directly observed.
27. If a leak is detected, tighten all the lower insulation retainer nuts, allow the frypot to run for five additional
minutes, and repeat steps 25 and 26.
28. If the leak persists, use a rubber hammer and a small block of wood to tap the corners of the lower
combustion chamber insulation retainers. Repeat steps 25 through 27. Repeat this step until no leakage is
detected.

1-13
1.9.10 Replacing the Filter Motor or Filter Pump
1. Disconnect the unit from the electrical power supply.
2. Remove the filter pan from the unit.
3. Position a container beneath the oil return fitting at the front of the cabinet. Disconnect the flexible oil line
from the fitting, allowing any residual oil to drain into the container.
4. At the rear of the fryer, unplug the left connector (as viewed from the rear of the fryer) from the transformer
box.
5. Remove the four nuts and bolts attaching the motor mount to the rear motor mount support.
6. At the front of the fryer, remove the cover plate from the front of the motor and disconnect the motor wires.
7. Place a 1-foot (30.5-cm) length of wood (or similar support) beneath the motor mount near the front of the
unit and remove the two remaining nuts and bolts attaching the motor mount to the front cabinet cross-
brace.
8. Carefully remove the support and lower the motor mount to the floor, allowing the rear of the mount to
slide forward and off the rear motor mount support.
9. Disconnect the return flexline from the pump. The motor and pump assembly can now be pulled from
beneath the fryer and the failed component can be removed and replaced.
10. Position the replacement motor and pump assembly beneath the fryer and reconnect the oil return flexline to
the pump. Lift the rear of the motor mount up and onto the rear motor mount support.
11. Lift the front of the motor mount up and support it with a 1-foot (30.5-cm) piece of wood or a similar
support. Install but do not tighten the two nuts and bolts that attach the motor mount to the front cabinet
cross-brace.
12. Install and tighten the four nuts and bolts that secure the motor mount to the rear motor mount support.
13. At the front of the fryer, tighten the two nuts and bolts at the front of the motor mount. Reconnect the
motor power wires and reinstall the wiring cover plate.
14. Reconnect the oil return flexline and reinstall the filter pan.
15. Reconnect the unit to the electrical power supply, fill the frypots with oil and check for proper operation.
1.9.11 Replacing the Frypot
1. Disconnect the fryer from the electrical and gas supplies.
2. Remove the filter pan from the unit and drain one frypot at a time into a McDonald’s Shortening Disposal
Unit (MSDU) or other appropriate metal container using the drain function on the MIB board (see section
1.14 on page 29).
DANGER
DO NOT attempt to drain more than one full frypot or two split frypots into the MSDU
at one time.
3. Dismount the topcap by removing the screws on the bottom of each front corner and lifting the topcap
straight up.
4. Remove the bezels by lifting them up to disengage the tabs along the lower edges from the slots in the
control panel frame. Remove the top screws in the upper corners of the computer.
5. Grasp the upper edge of each computer and swing the computer downward. Unplug the computer wiring
harness and grounding wire from the back of each computer.
6. Remove the computers by lifting them from the hinge slots in the control panel frame.
7. Disconnect the sound device wire from the interface board.
8. Disconnect the flame sensor wires by carefully pulling the push-on terminals from the terminal strips on the
ignitors. Disconnect the gas enrichment tube at the ignitor-end compression fitting. Disconnect the ignition
cables from the ignitors by grasping the boots and gently pulling toward you.

1-14
9. Remove the two mounting screws on each side of the component box and rotate the top of the box out of
the frame. Carefully pull it out enough to disconnect the wiring harness connector from the back of the
box. Cut any ties that prevent the box from being pulled out of the control panel frame.
10. Carefully pull the box clear of the frame and rest it on top of the fryer.
11. Using a pin pusher, remove the temperature probe, high-limit thermostat wires and RTD probe wires from
the plugs or terminals, marking each wire to facilitate re-assembly.
12. Disconnect the actuators from the return and drain valves.
13. Remove the section(s) of drain from the drain valve(s) of the frypot to be removed.
14. Disconnect the gas lines from the burner orifices and ignitor assemblies.
15. Remove the frypot hold down bracket.
16. Remove the screws in the back panel and inside the flue cap at each end that secure the flue cap to the fryer
and lift it clear of the fryer.
17. Disconnect the oil return line(s) from the frypot to be removed.
18. Disconnect all wiring from the AIF board.
19. Carefully lift the frypot from the fryer cabinet.
20. Remove the drain valve(s), temperature probe(s), high-limit thermostat(s), RTD probes, oil level sensor
probes, AIF boards, actuators and ignitor assemblies. Inspect each of these components carefully and
install them in the replacement frypot if they are in serviceable condition. Use Loctite®PST56765 sealant
or equivalent on component threads.
NOTE: Some servicers, based upon their experience, recommend that probes and thermostats be replaced
whenever a frypot is replaced; however, this remains the customer’s decision.
21. Reverse steps 1-20 to reassemble fryer.
NOTE: Care should be taken not to over-torque nuts on frypots made of 400-series stainless steel, as this
could tear the material. One turn past hand-tight is sufficient torque.
22. Perform steps 14 through 18 of Section 1.9.9 to ensure that there are no leaks in the burner insulation.
CAUTION
Before installing temperature probes, high-limit thermostats, RTD probes, oil level
sensor probes, return valves and drain valves on replacement frypot, clean the
threads and apply Loctite®PST56765 thread sealant or equivalent.
1.9.12 Replacing Frypot Insulation and/or Upper Burner Rails
NOTE: Replacing the burner rails requires completely tearing down the frypot and installing new frypot
insulation. Refer to the frypot exploded view below for component identification.
1. Remove the frypot per Section 1.9.11.
2. Remove the burner assemblies (1).
3. Remove insulation retainers and blanket insulation (2).
4. Remove the upper oil zone insulation bracket and upper oil zone insulation (3).
5. Remove the plenum (4).
6. Remove the front lower combustion chamber insulation retainer and insulation (5), and the front lower
combustion chamber inner insulation retainer and insulation (6). NOTE: Full-vat units have two-piece
insulation retainer and insulation components. Dual-vat units have one-piece components.
7. Remove the upper combustion chamber insulation retainer and insulation (7).
8. Remove the inner upper combustion chamber insulation retainer and insulation (8).
9. Remove the rear lower combustion chamber retainers, back, and insulation (9). NOTE: Full-vat units have
two-piece backs and four retainers. Dual-vat units have one-piece backs and two retainers.
10. Remove the flue assembly (10).

1-15
Disassembling A Frypot
(Full Vat Illustrated)
Spacers
Spacer
10
2
3
4
5
6
7
8
1
11
9
See page 1-17 for reassembly illustration.
11. Remove the upper burner rails (11). NOTE: For the following steps, refer to the frypot exploded view on
page 1-16 for component identification.
12. Remove any residual insulation, sealant, and/or oil from the exterior of the frypot.
13. Place the “L” shaped pieces of the combustion chamber insulation (1) in the front and rear corners of both
upper rail-retaining slots. (See page 1-16).
14. Using a mallet and short piece of wood, tap the corner tabs of the combustion chamber over the insulation
to ensure a solid seal of the burner.
15. Install the upper burner rails (2) with the heat deflectors slanting toward the rear of the frypot. The rails
will cover the “L” shaped pieces of combustion chamber insulation previously installed.
16. Place the upper inner combustion chamber insulation and insulation retainers (3) on the top two studs on
each side of the front of the frypot and secure with ¼”-20 washer-nuts. It is normal for the retainers to slice
off the overhanging insulation.
17. Place the lower rear combustion chamber insulation (4) on the lower four studs at the rear of the frypot.
18. Place one 1.625-inch tubular spacer (5) on each of the flue assembly (upper) studs at the rear of the frypot.
NOTE: There are three different sizes of spacers. Verify the size to ensure the correct spacers are installed.
19. Press the flue assembly (6) over the burner rails. It may be necessary to use a rubber mallet or screwdriver
to align the components. Use four ¼”-20 washer nuts to secure the flue assembly. Do not tighten the
retainer nuts at this point. They should be finger-tight only. NOTE: The flue edge will cover one to
two inches of the lower insulation.
20. Install the lower rear combustion chamber back(s) and retainer(s) (7) with the flanged edge(s) against the
flue. Secure with ¼”-20 washer nuts. NOTE: Full-vat units have two-piece backs and four retainers.
Dual-vat units come with one-piece backs and only two retainers.