Frymaster FMH150 Service Manual

INSTALLATION, OPERATION,

Return to Cover

SERVICE, AND PARTS MANUAL

H50 SERIES GAS FRYERS

(Series Codes AY through BE)

Frymaster, L.L.C., 8700 Line Avenue, PO Box 51000, Shreveport, Louisiana 71135-1000

Shipping Address: 8700 Line Avenue, Shreveport, Louisiana 71106

TEL [phone] FAX (Parts) 318-219-7140 (Tech Support) 318-219-7135

PRINTED IN THE UNITED STATES

SERVICE HOTLINE

1-800-551-8633

819-0001 11/00

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.

DANGER

POST IN A PROMINENT LOCATION THE INSTRUCTIONS TO BE FOLLOWED IN THE

EVENT THE USER SMELLS GAS. THIS INFORMATION SHALL BE OBTAINED BY

CONSULTING THE LOCAL 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.

FRYMASTER FRYERS EQUIPPED WITH LEGS ARE FOR PERMANENT

INSTALLATION. FOR MOVEABLE OR PORTABLE INSTALLATION, FRYMASTER

OPTIONAL EQUIPMENT CASTERS MUST BE USED.

QUESTIONS??? CALL 1-800-551-8633.

H50 SERIES GAS FRYERS

TABLE OF CONTENTS

CHAPTER 1: General Information

1.1 Parts Ordering and Service Information............................................................................ 1-1

1.2 Safety Information............................................................................................................. 1-1

1.3 European Community (CE) Specific Information............................................................. 1-2

1.4 Equipment Description...................................................................................................... 1-3

1.5 Installation, Operating, and Service Personnel ................................................................. 1-3

1.6 Definitions......................................................................................................................... 1-4

1.7 Shipping Damage Claim Procedure.................................................................................. 1-4

CHAPTER 2: Installation Instructions

2.1 General Installation Requirements.................................................................................... 2-1

2.2 Caster/Leg Installation ......................................................................................................2-3

2.3 Pre-Connection Preparations............................................................................................. 2-3

2.4 Connection to Gas Line..................................................................................................... 2-5

2.5 Converting to Another Gas Type ...................................................................................... 2-7

CHAPTER 3: Operating Instructions

3.1 Start-Up Procedure............................................................................................................ 3-2

3.2 Boiling Out the Frypot ...................................................................................................... 3-4

3.3 Shutting the Fryer Down...................................................................................................3-5

3.4 Controller Operation and Programming............................................................................ 3-5

Computer Magic III Controller ......................................................................................... 3-6

Analog Controller............................................................................................................ 3-11

Digital Controller ............................................................................................................ 3-12

Solid-State Basket Lift Timer ......................................................................................... 3-13

CHAPTER 4: Filtration Instructions

4.1 Draining and Manual Filtering.......................................................................................... 4-1

4.2 Built-In Filtration System Operation................................................................................. 4-2

Preparing the Filter Unit for Use....................................................................................... 4-2

Operation of the Filter Unit............................................................................................... 4-4

Changing the Filter Paper.................................................................................................. 4-6

CHAPTER 5: Preventive Maintenance

5.1 Fryer Preventive Maintenance Checks and Service.......................................................... 5-1

Daily Checks and Service.................................................................................................. 5-1

Weekly Checks and Service..............................................................................................5-1

Monthly Checks and Service............................................................................................. 5-3

Quarterly Checks and Service........................................................................................... 5-5

Semi-Annual Checks and Service..................................................................................... 5-7

5.2 Built-In Filtration System Preventive Maintenance Checks and Service ......................... 5-9

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H50 SERIES GAS FRYERS

TABLE OF CONTENTS

CHAPTER 6: Operator Troubleshooting

6.1 Introduction........................................................................................................................6-1

6.2 Troubleshooting Fryers and Controllers............................................................................6-2

6.3 Troubleshooting the Built-In Filtration System .................................................................6-5

6.4 Replacing the Ignition Module Fuse..................................................................................6-8

6.5 Replacing the Controller or Controller Wiring Harness....................................................6-8

CHAPTER 7: Service Procedures

7.1 Functional Description.......................................................................................................7-1

The Electronic Ignition System.........................................................................................7-1

Interface Boards.................................................................................................................7-2

Thermostats........................................................................................................................7-5

7.2 Accessing Fryers for Servicing..........................................................................................7-5

7.3 Cleaning the Gas Valve Vent Tube ...................................................................................7-5

7.4 Checking the Burner Manifold Gas Pressure ....................................................................7-5

7.5 Measuring Flame Current..................................................................................................7-6

7.6 Replacing Fryer Components............................................................................................7-6

7.6.1 Replacing the Controller or the Controller Wiring Harness...............................7-6

7.6.2 Replacing the Temperature Probe or High-Limit Thermostat............................7-6

7.6.3 Replacing the Interface Board ...........................................................................7-7

7.6.4 Replacing an Ignition Module............................................................................7-7

7.6.5 Replacing an Ignitor Assembly...........................................................................7-8

7.6.6 Replacing a Combustion Air Blower..............................................................................7-8

7.6.7 Replacing a Gas Valve........................................................................................7-8

7.6.8 Replacing a Burner Assembly............................................................................7-9

7.6.9 Replacing the Frypot.........................................................................................7-10

7.6.10 Replacing Frypot Insulation and/or Upper Burner Rails..................................7-12

7.7 Troubleshooting and Problem Isolation...........................................................................7-17

7.7.1 Ignition Failures................................................................................................7-17

7.7.2 Improper Burner Functioning........................................................................... 7-18

7.7.3 Improper Temperature Control.........................................................................7-20

7.7.4 Computer-Related Problems.............................................................................7-21

7.7.5 Filtration Problems ...........................................................................................7-22

7.7.6 Leakage Problems.............................................................................................7-27

7.7.7 Basket Lift Malfunctions..................................................................................7-27

7.7.8 Interpretation of Digital Controller Lights........................................................7-32

7.8 Troubleshooting Guides...................................................................................................7-32

7.8.1 Troubleshooting the 24 VAC Circuit in Units..................................................7-33

7.8.2 Troubleshooting the 24 Gas Valve ...................................................................7-35

7.8.3 Troubleshooting the Temperature Probe ..........................................................7-36

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TABLE OF CONTENTS

Probe Resistance Chart.................................................................................................... 7-37

7.9 Simplified Wiring Diagrams........................................................................................... 7-39

7.10 Principal Wiring Connections......................................................................................... 7-41

7.11 Wiring Diagrams – Main ................................................................................................ 7-42

7.12 Wiring Diagrams – Transformer Boxes.......................................................................... 7-47

7.13 Wiring Diagrams – Basket Lifts...................................................................................... 7-49

7.14 Wiring Diagrams – Filter Boxes .....................................................................................7-52

CHAPTER 8: Parts List

8.1 Accessories........................................................................................................................ 8-1

8.2 Basket Lift Assemblies and Component Parts.................................................................. 8-2

8.2.1 Bell Crank Basket Lifts...................................................................................... 8-2

8.2.2 Modular Basket Lifts.......................................................................................... 8-3

8.3 Blower Assemblies and Associated Components............................................................. 8-6

8.4 Burner Ignition System Components and Associated Hardware...................................... 8-8

8.5 Cabinet Assemblies and Component Parts........................................................................ 8-9

8.5.1 FPH150............................................................................................................... 8-9

8.5.2 FPH50 Batteries ...............................................................................................8-10

8.5.3 FMH150 and MJH150 ..................................................................................... 8-12

8.5.4 FMH50 and MJH50 Batteries .......................................................................... 8-13

8.5.5 Filter Magic II ..................................................................................................8-14

8.6 Casters, Legs, and Associated Hardware ........................................................................8-16

8.7 Component Box Assemblies and Associated Component Parts..................................... 8-17

8.8 Control Panel Assemblies, Flue Caps, Top Caps, and Related Components.................. 8-18

8.9 Controller Assemblies.....................................................................................................8-19

8.10 Door Assemblies.............................................................................................................8-20

8.11 Drain System Components.............................................................................................. 8-21

8.11.1 Filter Magic II Square Drain Components, Standard Configuration ............... 8-21

8.11.2 Filter Magic II Square Drain Components, Foodmaker Configuration ........... 8-22

8.11.3 FootPrint III Square Drain Components, Standard Configuration................... 8-23

8.11.4 FootPrint III Square Drain Components, Rear Flush Configuration................ 8-24

8.11.5 FootPrint III Square Drain Components, Foodmaker Configuration............... 8-25

8.12 Drain Valve Assemblies.................................................................................................. 8-26

8.12.1 MJH50 Dual Vat Valve Assemblies, 1”, Domestic and Export Models.......... 8-26

8.12.2 MJH50 Full Vat Valve Assemblies, 1 ¼”, Domestic and Export Models.......8-26

8.12.3 FMH50 (CE) Dual Vat Valve Assemblies, 1”................................................. 8-27

8.12.4 FMH50 Domestic and Non-CE Export Dual Vat Valve, 1”............................ 8-28

8.12.5 FMH50 (CE) Full Vat Valve Assembly, 1 ¼”................................................. 8-28

8.12.6 FMH50 Domestic and Non-CE Export Full Vat Valve Assembly, 1 ¼” ........ 8-29

8.12.7 FPH50 (CE) Dual Vat Valve Assemblies, 1”................................................... 8-30

8.12.8 FPH50 Domestic and Non-CE Export Dual Vat Valve Assemblies, 1”..........8-31

8.12.9 FPH50 Domestic and Export Full Vat Valve Assemblies, 1 ¼”...................... 8-32

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TABLE OF CONTENTS

8.13 Filtration Systems and Component Parts (Other Than Drain Components) ...................8-33

8.13.1 Filter Magic II/Single FootPrint III Filter Pan Assembly.................................8-33

8.13.2 FootPrint III Filter Pan Assembly.....................................................................8-34

8.13.3 FootPrint III Filter Base Assemblies................................................................8-35

8.13.4 Filter Magic Oil Return Plumbing Components (Including Pump & Motors).8-36

8.13.5 FootPrint III Filter Motors and Pump Plumbing Components.........................8-38

8.13.6 FootPrint III with Power Shower Oil Return Plumbing Components..............8-40

8.13.7 FootPrint III with Rear Flush Oil Return Plumbing Components....................8-42

8.13.8 FPH150 Oil Return Plumbing (Including Handle)...........................................8-44

8.13.9 Oil Return Handle Assembly, Filter Magic & Standard FootPrint III..............8-46

8.13.10 Oil Return Handle Assembly, Rear Flush Units...............................................8-47

8.13.11 Power Shower Assemblies (All Systems) ........................................................8-48

8.13.12 Oil Disposal Systems Plumbing .......................................................................8-49

8.14 Frypot Assemblies and Component Parts........................................................................8-51

8.14.1 Replacement Frypots and Frypot Insulation Kits.............................................8-51

8.14.2 Full Vat Frypot Assembly, with Power Shower, Component Parts.................8-52

8.14.3 Dual Vat Frypot Assembly, with Power Shower, Component Parts................8-54

8.15 Gas Manifold Assemblies and Component Parts ............................................................8-56

8.15.1 CE Units............................................................................................................8.56

8.15.2 Non-CE Units ...................................................................................................8-58

8.16 Gas Valve Assemblies and Associated Parts...................................................................8-60

8.16.1 CE Gas Valve Assemblies................................................................................8-60

8.16.2 Non-CE Gas Valve Assemblies........................................................................8-62

8.16.3 Gas Supply Lines and Enrichment Tubes.........................................................8-63

8.17 Thermostats, Temperature Probes, and Related Components.........................................8-64

8.18 Transformer Box and Filter Box Component Parts.........................................................8-64

8.19 Wiring Harnesses, Wiring Assemblies, and Plug Assemblies.........................................8-66

8.19.1 Filter Box Wiring..............................................................................................8-66

8.19.2 Main Wiring Harnesses ....................................................................................8-66

PARTS LIST INDEX.................................................................................................................8-67

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H50 SERIES GAS FRYERS

CHAPTER 1: GENERAL INFORMATION

1.1 Parts Ordering and Service Information

In order to assist you quickly, the Frymaster Factory Authorized Service Center (FASC) or Service
Department representative requires certain information about your equipment. Most of this informa­tion is printed on a data plate affixed to the inside of the fryer door. Part numbers are found in the
Installation, Operation, Service, and Parts Manual. Parts orders may be placed directly with your
local FASC or distributor. Included with fryers when shipped from the factory is a list of Frymaster
FASCs. If you do not have access to this list, contact the Frymaster Service Department at 1-800­551-8633 or 1-318-865-1711.

When ordering parts, the following information is required:

Model Number:
Serial Number:
Type of Gas or Voltage:
Item Part Number:
Quantity Needed:

Service information may be obtained by contacting your local FASC/Distributor. Service may also
be obtained by calling the Frymaster Service Department at 1-800-551-8633 or 1-318-865-1711.
When requesting service, please have the following information ready:

Model Number:
Serial Number:
Type of Gas:

In addition to the model number, serial number, and type of gas, please be prepared to describe the
nature of the problem and have ready any other information that you think may be helpful in solving
your problem.

RETAIN AND STORE THIS MANUAL IN A SAFE PLACE FOR FUTURE USE.

1.2 Safety Information

Before attempting to operate your unit, read the instructions in this manual thoroughly.
Throughout this manual, you will find notations enclosed in double-bordered boxes similar to the

one below.

CAUTION boxes contain information about actions or conditions that may cause or result in a

malfunction of your system.

CAUTION

Example of a CAUTION box.

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H50 SERIES GAS FRYERS

CHAPTER 1: GENERAL INFORMATION

WARNING boxes contain information about actions or conditions that may cause or result in damage

to your system, and which may cause your system to malfunction.

WARNING

Example of a WARNING box.

DANGER boxes contain information about actions or conditions that may cause or result in injury to

personnel, and which may cause damage to your system and/or cause your system to malfunction.

DANGER

Hot cooking oil or shortening causes severe burns. Never attempt to move a fryer

containing hot cooking oil/shortening or to transfer hot cooking oil/shortening from

one container to another.

Your fryer is equipped with automatic safety features:

1. High temperature detection shuts off gas to the burner assembly should the controlling thermostat
fail.

2. An optional safety switch built into the drain valve prevents burner ignition with the drain valve
even partially open.

1.3 European Community (CE) Specific Information

The European Community (CE) has established certain specific standards regarding equipment of
this type. Whenever a conflict exists between CE and non-CE standards, the information or instruc­tions concerned are identified by means of shadowed boxes similar to the one below.

Non-CE Standard

for Incoming Ga s Pressures

Ty pe Minimum Maximum

6" W.C. 14" W.C.

Na tural 1.49 k Pa 3.49 kPa

14.68 mbar 34.72 mbar
11" W.C. 14" W.C.

LP 2.74 kPa 3.49 kPa

27.28 mbar 34.84 mbar

1-2

H50 SERIES GAS FRYERS

CHAPTER 1: GENERAL INFORMATION

1.4 Equipment Description

H50 Series high-efficiency gas fryers employ a unique infrared burner system that uses up to 43%
less energy to cook the same volume as conventional fryers. Models in this series include MJH50,
FMH50, and FPH50 variants. MJH50 variants have no built-in filtration system. FMH50 variants
have a built-in Filter Magic II filtration system. The Filter Magic system is housed in its own cabi­net, which may be attached to either side of a fryer and which can be located anywhere in a battery of
fryers. The FPH50 variants have a built-in FootPrint III filtration system that is located underneath
the fryer to conserve floor space. (In batteries of fryers, the FootPrint III syste m is always loc ated
under the leftmost two fryers.)

All H50 Series fryers are of an open-pot design with no tubes and have a hand-sized opening into the
deep cold zone, which makes cleaning the stainless frypot quick and easy.

Frypots are constructed of welded, heavy-gauge stainless steel, and may be configured with a single
(full) vat or dual vats. A drain valve is tapped into the center of the frypot, with a front-operated
manual ball valve. Heating is supplied by a pair of infrared burner assemblies mounted on each side
of the frypot. Combustion air for the burners is supplied by a dedicated blower mounted on the front
of the frypot. H50 Series fryers can be configured for natural gas, propane (LP), or manufactured
gas, as required by the customer.

Each frypot is equipped with a temperature probe for precise temperature control. The probe is lo­cated on the centerline of the frypot for rapid response to changes in loads, and to provide the most
accurate temperature measurement.

All H50 Series fryers come standard with electronic ignition, melt cycle, and boil-out mode. Control
opt ion s i n c l u de Comp u ter Ma g i c III c o mpu t e r s , so l id- s t a t e a nal o g c o n t r o lle r s , d igi t a l c o n tro l ler s , a n d
basket lift timers. Each type is covered in detail in Chapter 3, Fryer Operating Instructions.

All fryers in this series require an external source of AC electrical power. Uni ts can be configured
for voltages ranging from 120 VAC to 220 VAC.

Fryers equipp ed with FootPrint III built-in filtration systems are shipped completely assembled. Fry­ers without the FootPrint III req ui r e i n s t al l a t io n o f l e gs o r o p t i on a l ca s t er s at p o i nt o f us e . A l l f rye rs
are shipped with a package of standard accessories. Each fryer is adjusted, tested, and inspected at
the factory before crating for shipment.

1.5 Installation, Operating, and Service Personnel

Operating information for Frymaster equipment has been prepared for use by qualified and/or
authorized personnel only, as defined in Section 1.6.

All installation and servi ce on Frymaster equipment must be performed by qual ifi ed, certi fied,
licensed, and/or authorized installation or service personnel, as defined in Section 1.6.

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H50 SERIES GAS FRYERS

CHAPTER 1: GENERAL INFORMATION

1.6 Definitions

QUALIFIED AND/OR AUTHORIZED OPERATING PERSONNEL

Qualified/authorized operating personnel are those who have carefully read the information in this
manual and have familiarized themselves with the equipment functions, or who have had previous
experience with the operation of the equipment covered in this manual.

QUALIFIED INSTALLATION PERSONNEL

Qualified installation personnel are individuals, firms, corporations, and/or companies which, either
in person or through a representative, are engaged in and are responsible for the installation of gas­fired appliances. Qualified personnel must be experienced in such work, be familiar with all gas
precautions involved, and have complied with all requirements of applicable national and local
codes.

QUALIFIED SERVICE PERSONNEL

Qualified service personnel are those who are familiar with Frymaster equipment and who have been
authorized by

Frymaster

Frymaster

FrymasterFrymaster

Corporation to perform service on Frymaster equipment. All authorized

service personnel are required to be equipped with a complete set of service and parts manuals, and
to stock a minimum amount of parts for Frymaster equipment. A list of Frymaster Factory Author­ized Service Centers (FASC) was included wit h the fryer when shipped from the fact ory. Failure to

use qualified service personnel will void the Frymaster Warranty on your equipment.

1.7 Shipping Damage Claim Procedure

Your Frymaster equipment was carefully inspected and packed before leaving the factory. The
transportation company assumes full responsibility for safe delivery upon its acceptance of the
equipment for transport.

What to do if your equipment arrives damaged:

1. File a claim for damages immediately, regardless of the extent of damages.

2. Inspect for and record all visibl e loss or damage, and ensure that this information is noted on

the freight bill or express receipt and is signed by the person making the delivery.

3. Concealed loss or damage that was unnoticed until the equipment was unpacked should be re-

corded and reported to the freight company or carrier immediately upon discovery. A concealed
damage claim must be submitted within 15 days of the date of delivery. Ensure that the shipping
container is retained for inspection.

Frymaster

Frymaster

FrymasterFrymaster

DOES NOT ASSUME RESPONSIBILITY FOR DAMAGE OR LOSS

INCURRED IN TRANSIT.

1-4

H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

2.1 General Installation Requirements

PROPER INSTALLATION IS ESSENTIAL FOR EFFICIENT, TROUBLE-FREE OPERATION OF YOUR
FRYER. ANY UNAUTHORIZED ALTERATIONS MADE TO THIS EQUIPMENT W ILL VOID THE FRYM AS-

WARRANTY.

TER

Upon arrival, inspect the fryer carefully for visible or concealed damage. (See Shipping Damage
Claim Procedure in Chapter 1.)

CLEARANCE AND VENTILATION

The fryer(s) must be installed with a 6” (150 mm) clearance at both sides and back when installed
adjacent to combustible construction; no clearance is required when installed adjacent to noncom­bustible construction. A minimum of 24” (600 mm) clearance should be provided at the front of the
fryer.

One of the most important considerations of efficient fryer operation is ventilation. Make sure the
fryer is installed so that products of combustion are removed efficiently, and that the kitchen ventila­tion system does not produce drafts that interfere with proper burner operation.

The fryer flue opening must not be placed close to the intake of the exhaust fan, and the fryer must
never have its flue extended in a “chimney” fashion. An extended flue will change the combustion
characteristics of the fryer, causing longer recovery time. It also frequently causes delayed ignition.
To provide the airflow necessary for good combustion and burner operation, the areas surrounding
the fryer front, sides, and rear must be kept clear and unobstructed.

Fryers must be installed in an area with an adequate air supply and adequate ventilation. Adequate
distances must be maintained from the flue outlet of the fryer to the lower edge of the ventilation
filter bank. Filters should be installed at an angle of 45º. Place a drip tray beneath the lowest edge of
the filter. For U.S. installation, NFPA standard No. 96 states, “A minimum distance of 18 in. (450
mm) should be maintained between the flue outlet and the lower edge of the grease filter.”

Frymaster recommends that the minimum distance be 24 in. (600 mm) from the flue outlet to the
bottom edge of the filter when the appliance consumes more than 120,000 BTU per hour.

For installations in the United States, information on construction and installation of ventilating
hoods can be found in the NFPA standard cited above. A copy of the standard may be obtained from
the National Fire Protection Association, Battery March Park, Quincy, MA 02269.

DANGER

Do not attach an apron drainboard to a single fryer. The fryer may become unstable,

tip over, and cause injury. The appliance area must be kept free and clear of com-

bustible material at all times.

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H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

NATIONAL CODE REQUIREMENTS

The type of gas for which the fryer is equipped is stamped on the data plate attached to the inside of
the fryer door. Connect a fryer stamped “NAT” only to natural gas, those stamped “PRO” only to
propane gas, and those stamped “MFG” only to manufactured gas.

Installation shall be made with a gas connector that complies with national and local codes, and,
where applicable, CE codes. Quick-disconnect devices, if used, shall likewise comply with national,
local, and, if applicable, CE codes.

ELECTRICAL GROUNDING REQUIREMENTS

All electrically operated appliances must be grounded in accordance with all applicable national and
local codes, and, where applicable, CE codes. A wiring diagram is located on the inside of the fryer
door. Refer to the rating plate on the inside of the fryer door for proper voltages.

DANGER

If this appliance is equipped with a three-prong (grounding) plug, it must be plugged

directly into a properly grounded receptacle.

Do not cut or remove the grounding prong from the plug.

DANGER

This equipment requires electrical power for operation.

Place the gas control valve in the OFF position in case of a prolonged power outage.

Do not attempt to use the equipment during a power outage.

FCC COMPLIANCE

The user is cautioned that any changes or modifications to Frymaster computers not expressly ap­proved by the party responsible for compliance could void the user’s authority to operate the equip­ment.

Frymaster computers have been tested and found to comply with the limits for a Class A digital de­vice, pursuant to Part 15 of the FCC rules. Whil e these devices are verified as C lass A devices, t hey
have been shown to meet the Class B limits. These limits are designed to provide reasonable protec­tion against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of the equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.

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H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

If necessary, the user should consult the dealer or an experienced radio and television technician for
additional suggestions.

The user may find the booklet “How to Identify and Resolve Radio-TV Interference Problems” help­ful. It is prepared by the Federal Communications Commission and is available from the U.S. Gov­ernment Printing Office, Washington, DC 20402, Stock No. 004-000-00345-4.

2.2 Caster/Leg Installation

Depending upon the specific configuration ordered your fryer may have been shipped without in­stalled casters or legs. If casters or legs are installed, you may skip this section and proceed to sec­tion 2.3, Pre-Connection Preparations.

If your fryer requires the installation of casters/legs, install them in accordance with the in­structions included in your accessory package.

2.3 Pre-Connection Preparations

DANGER

Do not connect fryer to gas supply before completing each step

in this section.

After the fryer has been positioned under the fry station exhaust hood, ensure the following has been
accomplished:

1. Adequate means must be provided to limit the movement of fryers without depending upon the
gas line connections. If a flexible gas hose is used, a restraining cable must be connected at all
times when the fryer is in use. The restraining cable and installation instructions are packed with
the flexible hose in the accessories box that was shipped with your unit.

2. Single unit fryers must be stabilized by installing restraining chains on fryers equipped with
casters or anchor straps on fryers equipped with legs. Follow the instructions shipped with the
casters/legs to properly install the chains or straps.

3. Level fryers equipped with legs by screwing out the legs approximately 1 inch then adjusting them so that the fryer is level and at the proper height in the exhaust hood. Frymaster
recommends that the minimum distance from the flue outlet to the bottom edge of the hood be 24 in. (600 mm) when the appliance consumes more than 120,000 BTU per hour.
NOTE: There are no built-in leveling devices on fryers equipped with casters. The floor where the fryer is to be installed must be level.

4. Test the fryer electrical system:
a. Plug the fryer electrical cord(s) into a grounded electrical receptacle.

b. Place the power switch in the ON position.

• For fryers equipped with analog controls, verify that the power and heat lights are lit.

2-3

H50 SERIES GAS FRYERS

(1)

(1)

CHAPTER 2: INSTALLATION INSTRUCTIONS

• For fryers having computer or digital displays, verify that the display indicates CYCL.

c. Place the fryer power switch in the OFF position. Verify that the power and heat lights are

out, or that the display is blank.

5. Refer to the data plate on the inside of the fryer door to determine if the fryer burner is config-

ured for the proper type of gas before connecting the fryer quick-disconnect device or piping
from the gas supply line.

6. Verify the minimum and maximum gas supply pressures for the type of gas to be used in accor-

dance with the accompanying tables.

CE Standard

for Incom in g Gas Pressu res

for Fryers Manufactured After April 1999

Pressure

Gas

G20 20 2 x 3.40 2 x 3.40 7 mbar 7 mbar
G25 20 or 25 2 x 3.40 2 x 3.40 10 mbar 10 mbar
G30 28/30 or 50 2 x 2.05 2 x 2.05 17 mbar 17 mbar
G31 37 or 50 2 x 2.05 2 x 2.05 20 mbar 20 mbar

mbar = 10,2 mm H2O

(mbar)

Orifice Diameter
Single

(1)

Vat

Dual

Vat

Regulator Pressure

Single

Vat

Dual

Vat

Non-CE Standard

for Incoming Gas Pressures

Gas Minimum Maximum

Natural

LP

6" W.C.

1.49 kPa

14.93 mbar
11" W.C.

2.74 kPa

27.37 mbar

CE Standard

for Incom in g Gas Pressu res

for Fryers Manufactured Through April 1999

Pressure

Gas

G20 20 2 x 3.40 2 x 3.40 7 mbar 7 mbar
G25 20 or 25 2 x 3.40 2 x 3.40 10 mbar 9 mbar
G30 28/30 or 50 2 x 2.05 2 x 2.05 17 mbar 16,5 mbar
G31 37 or 50 2 x 2.05 2 x 2.05 20,2 mbar 18,5 mbar

mbar = 10,2 mm H2O

34.84 mbar

34.84 mbar

(mbar)

14" W.C.

3.48 kPa

14" W.C.

3.48 kPa

Orifice Diameter
Single

(1)

Vat

Dual

Vat

Regulator Pressure

Single

Vat

Dual

Vat

7. F or fr yers e quip ped with a Foo tPr int III syste m or b ask et li fts , pl ug t he el ect rica l co rd(s ) in to a
power receptacle behind the fryer.

2.4 Connection to Gas Line

The H50 Series has received the CE mark for the countries and gas categories indicated in the
accompanying table. NOTE: The nominal heat input (QN) is 21kW except for AT, DE, LU and
category 3P/B, which is 23kW.

CE Approved Gas Categories by Country

2-4

H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

COUNTRIES CATEGORIES G AS PRESSURE (MBAR)

AUSTRIA (AT) II2H3B/P
BELGIUM (BE)
DENMARK (DK) II2H3B/P

FRANCE (FR)

FINLAND (FI) II2H3B/P

GERMANY (DE)

GREECE (GR) II2H3+
ITALY (IT) II2H3+
IRELAND (IE) II2H3+
LUXEMBOURG (LU) II2E3B/P

NETHERLANDS (NL)

NORWAY (NO) I3B/P G30, G31 30
PORTUGAL (PT) II2H3+

SPAIN (ES)

SWEDEN (SE) II2H3B/P
UNITED KINGDOM (UK) II2H3+

I2E(R)B G20, G25 20, 25

I3+ G30, G31 28-30, 37

II2Esi3+
II2Esi3P

II2ELL3B/P

I3P G31 50

II2L3P

II2L3B/P

II2H3+
II2H3P

G20 20

G30, G31 50

G20 20
G30, G31 30
G20, G25 20, 25
G30, G31 28-30, 37
G20, G25 20, 25

G31 50

G20 20
G30, G31 30
G20, G25 20
G30, G31 50

G20 20
G30, G31 28-30, 37

G20 20
G30, G31 28-30, 37

G20 20
G30, G31 28-30, 37

G20 20
G30, G31 50

G25 25

G31 50

G25 25
G30, G31 30

G20 20
G30, G31 28-30, 37

G20 20
G30, G31 28-30, 37

G20 20

G31 37, 50

G20 20
G30, G31 30

G20 20
G30, G31 28-30, 37

The size of the gas line used for installation is very important. If the line is too small, the gas pres­sure at the burner manifold will be low. This may cause slow recovery and delayed ignition. The
incoming gas supply line should be a minimum of 1½” (38 mm) in diameter. Refer to the chart on
the following page for the minimum sizes of connection piping.

Gas Connection Pipe Sizes

(Minimum incoming pipe size should be 1 1/2" (38 mm))

4 or more

Gas Single Unit 2 - 3 Units

Natural

3/4" (19 mm)

1" (25 mm) 1 1/4" (33 mm)
Propane 1/2" (13 mm) 3/4" (19 mm) 1" (25 mm)
Manufactured 1" (25 mm) 1 1/4" (33 mm) 1 1/2" (38 mm)

units*

2-5

H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

* For distances of more than 20 feet (6 m) and/or more
than 4 fittings or elbows, increase the connection by one
pipe size.

Before connecting new pipe to your unit, the pipe must be thoroughly blown out to remove any for­eign particles. If these foreign particles get into the burner and controls, they will cause improper
and sometimes dangerous operation.

CE Standard

Required airflow for the combustion air supply is 2m3/h per kW.

1. Connect the quick-disconnect hose to the fryer quick-disconnect fitting under the front of the
fryer and to the building gas line.

NOTE: Some fryers are configured for a rigid connection to the gas supply line. These units are
connected to the gas supply line at the rear of the unit.

When using thread compound, use very small amounts on male threads only. Use a pipe thread
compound that is not affected by the chemical action of LP gases (Loctite™ PST56765 Sealant is
one such compound). DO NOT apply compound to the first two threads. This will ensure that
the burner orifices and control valve do not become clogged.

2. Open the gas supply to the fryer and check all piping, fittings, and gas connections for leaks. A
soap solution should be used for this purpose.

DANGER

Never use matches, candles, or any other ignition source to check for leaks.

If gas odors are detected, shut off the gas supply to the fryer

at the main shut-off valve and contact the local gas company or an authorized

service agency for service.

3. Close the fryer drain valve and fill the frypot with water and boil-out solution to the bottom OIL­LEVEL line at the rear of the frypot. Light the fryer and perform the boil-out procedures that are
described in the “Lighting Instructions” and “Boiling Out the Frypot” topics found in Chapter 3
of this manual.

WARNING
“Dry-firing” your unit will cause damage to the frypot. Always ensure that melted
shortening, cooking oil, or water and boil-out solution is in the frypot before firing

your unit for any extended period.

2-6

H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

4. It is suggested that the burner manifold pressure be checked at this time by the local gas company

or an authorized service agent. Refer to “Check Burner Manifold Pressure” in Chapt er 5 of this
manual for the proper procedure. The accompanying tables list the burner manifold gas pressures
for the various gas types that can be used with this equipment.

CE Standard

Burner Manifold Gas Pressures

for Fryers Manufactured After April 1999

Pressure (mbar)

Single

Natural Gas Lacq

Gas

(G20) under 20 mbar
Natural Gas Groningue *

(G25) under 25 mbar
Natural Gas Groningue

(G25) under 20 mbar
Butane

(G30) at 28/30 or 50 mbar
Propane

(G31) under 37 or 50 mbar

* Belgian G25 = 7,0 mbar (single or dual)

Vat

77

10 10

10 10

17 17

20 20

Burner Manifold Gas Pressures

for Fryers Manufactured Through April 1999

Dual

Vat

Natural Gas Lacq
(G20) under 20 mbar

Natural Gas Gronigue *
(G25) under 25 mbar

Natural Gas Gronigue
(G25) under 20 mbar

Butane
(G30) at 28/30 or 50 mbar

Propane
(G31) under 37 or 50 mbar

* Belgian G25 = 7,0 mbar (single) or 6,5 (dual)

Gas

Non-CE Standard

Burner Manifold Gas Pressures

Gas Pressure

Natural

Propane

3" W.C.

0.73 kPa

8.25" W.C.

2.5 kPa

CE Standard

Pressure (mbar)

Single

Vat

76,5

10 9

10 9

17 16,5

20,2 18,5

Dual

Vat

5. Check the programmed temperature or analog controller thermostat setting. (Refer to Chapter 3,

Operating Instructions, for the setpoint programming instructions for your particular controller.)

2.5 Converting to Another Gas Type

Your fryer is configured at the factory for either natural gas or propane (LP) gas. If you desire to
switch from one type of gas to another, a gas conversion kit must be installed by a Factory
Authorized Service Center technician.

DANGER

Switching to a different type of gas without installing the proper conversion kit may

result in fire or explosion! NEVER attach your fryer to a gas supply for which it is

not configured.

2-7

H50 SERIES GAS FRYERS

CHAPTER 2: INSTALLATION INSTRUCTIONS

H50 Series Fryers manufactured for Non-CE countries use different burners for each type gas. The
burners in fryers built for Propane gas have a special gray-colored coating on the burner tiles to en­able them to withstand the higher caloric value of the Propane gas. Burners designed for use in Pro­pane units may be used in natural gas applications, but not vice versa.

Non-CE Gas Conversion Kits

Natural Gas to Propane (LP) Gas Propane (LP) Gas to Natural Gas

Full Vat: Part Number 826-1145 Full Vat: Part Number 826-1146
Dual Vat: Part Number 826-1147 Dual Vat: Part Number 826-1148

Units manufactured for export to CE countries are equipped with “universal” burners that may be
used with either natural (G20, G25) gas or Butane (G30) and Propane (G31) gasses.

CE Gas Conversion Kits for Units with Gas Valve 810-1011

G20 or G25 (Natural) to G30 or G31 Gas: G30 or G31 to G20 or G25 (Natural) Gas:

Part Number 826-1196 Part Number 826-1197

CE GAS CONVERSION INSTRUCTIONS

1. Between G20- and G25-type Natural Gas, adjust the gas pressure at the regulator. (Refer to the
CE Standard Burner Manifold Gas Pressure Chart.) Do not change the orifice.

2. Between a 2nd family (G20 or G25) and a 3rd family gas (G30 Butane or G31 Propane):
a. Change the orifices.
b. Change the gas valve spring (units with valve part number 810-1011only)
c. Adjust the manifold pressure.

3. Remove the rating plate and install a new one. Call your local service agency or KES for a new
rating plate.

4. If the destination language changes, replace the labels. Call your local service agency or KES for
a label kit. The language of reference will be on the corner of the label.

2-8

H50 SERIES GAS FRYERS

p

n

)

CHAPTER 3: OPERATING INSTRUCTIONS

FINDING YOUR WAY AROUND THE H50 SERIES FRYER

Control Panel (CM III

uter show

Com

Top Cap

Wiring Diagrams

Flue Cap

Basket Hangers

Flue

Fryer Identification
Data Labels (Model
and Serial Number)

Combustion Blowers

Drain and Filter Control Handles.

FootPrint III Built-in Filtration Unit

TYPICAL CONFIGURATION

(FPH350 SHOWN)

3-1

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

3.1 Start-Up Procedure

CAUTION

If this is the first time the fryer is being used a fter installation, refer to Sec ti on 3.2,

Boil-Out Procedure.

CAUTION
The cooking oil/shortening capacity of the H50 Series fryer is 50 lbs (25 liters) at
70ºF (21ºC) for a full pot and 25 lbs (12.5 liters) at 70ºF (21ºC) for each half of a split
pot.

Before lighting the fryer, make sure the fryer is OFF and the frypot drain valve(s)
is/are closed. Remove the basket support rack(s), if installed, and fill the frypot to
the bottom OIL-LEVEL line.

If solid shortening is being used, make sure it is packed down into the bottom of the
frypot.

Lighting the Fryer

1. Press the computer/controller POWER switch to the OFF position.

Non-CE Fryers

After placing the ON/OFF switch in the OFF
position, turn the gas valve knob to the OFF
position. Wait 5 minutes, then turn the knob to
the ON position.

ON

OFF

Honeywell

Honeywell

ON

OFF

2. Press the computer/controller POWER switch to the ON position and set the thermostat or pro-

gram the computer for normal cooking temperature.

3. If the burners fail to light, press the POWER switch to the OFF position and wait 60 seconds.

Repeat step 2.

3-2

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

4. The fryer will automatically enter the Melt Cycle mode if the frypot temperature is below 180ºF

(82ºC). (NOTE: During the melt cycle, the burners will repeatedly fire for a few seconds, then
go out for a longer period.) When the frypot temperature reaches 180ºF (82ºC), the unit will
automatically switch to the Heating mode. The burners will remain lit until the frypot tempera­ture reaches the programmed cooking temperature.

5. 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.

Left

Viewing

Port

Right

Viewing

Port

Behind

Motor

The optimum burn is a bright orange-red glow. If a blue flame is observed, or if there are dark
spots on a burner face, the air/gas mix requires adjustment. Adjustment procedures are different
for CE and Non-CE units.

Adjusting Air/Gas Mix:

Non-CE Units and CE Units Built After April 1999

On the side of the blower housing opposite the motor is a plate with one or two locking nuts. Loosen
the nut(s) enough to allow the plate to be moved, then adjust the position of the plate to open or close
the air intake opening until a bright orange-red glow is obtained. Carefully hold the plate in position
and tighten the locking nut(s).

Adjusting Air/Gas Mix:

CE Units Built Before May 1999

CE units built before May 1999 are equipped with a shield assembly in front of the blowers. An air
shutter plate on the face of the shield assembly regulates the amount of airflow to the blower intake.
To adjust the shutter plate, loosen the locking screws and slide the shutter to the left or right as nec­essary to obtain a bright orange-red glow. Carefully hold the shutter plate in position and tighten the
locking screws.

3-3

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

3.2 Boiling Out the Frypot

To ensure that the frypot is free of any contamination resulting from its manufacture, shipping, and
handling during installation, the frypot must be boiled out before first use. Frymaster recommends
boiling out the frypot each time the oil or shortening is changed.

1. Before lighting the burners, close the fryer drain valve(s) and fill the frypot to the bottom OIL-

LEVEL line with a mixture of cold water and Frymaster FRYER ‘N’ GRIDDLE cleaner or deter­gent.

2. For units equipped with other than Computer Magic III controllers or Solid-State Basket Lift

Timers, set the thermostat to, or program the controller for, 200ºF (93ºC).

For units equipped with Computer Magic III controllers, select the Boil-Out feature in accor­dance with the procedure Using the Boil-Out Feature on page 3-10.

For units equipped with Solid-State Basket Lift Timers, press the Boil-Out Mode button to
begin the boil-out process.

3. Place the fryer into operation in accordance with Section 3.1 and simmer the solution for 1 hour.

DANGER

Never leave the fryer unattended during the boil-out process. If the boil-out solution
boils over, turn off power to the fryer immediately and let the solution cool for a few
minutes before resuming the process.

4. After the solution simmers for 1 hour, turn the fryer off, allow the solution to cool, then add 2

gallons (7.75 liters) of cold water and stir. Drain the solution into a suitable container and clean
the frypot thoroughly.

WARNING

Do not drain boil-out solution into the built-in filtration system. Doing so may cause
damage to the filtration pump.

5. Rinse the frypot at least twice by filling the frypot with clean water and draining. Dry the frypot

thoroughly with a clean, dry towel.

DANGER

Remove all drops of water from the frypot before filling with cooking oil/shortening.
Failure to do so may cause spattering of hot liquid when the oil/shortening is heated
to cooking temperature.

3-4

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

3.3 Shutting the Fryer Down

For short-term shut down during the workday, place the fryer power switch in the OFF position and
put the frypot covers in place (if the fryer is so equipped).

When shutting the fryers down at closing time, place the controller power switch in the OFF posi­tion.

Non-CE Fryers

After placing the POWER switch in the OFF
position, turn the gas valve knob to the OFF
position.

ON

OFF

Honeywell

Honeywell

ON

OFF

Put the frypot covers in place (if the fryer is so equipped).

3.4 Controller Operation and Programming

Fryers in the H50 Series can be equipped with any of the following controlling devices:

• Computer Magic III

• Analog Controller

• Digital Controller

• Basket Lift Timer

Each type is discussed in detail in the following pages.

3-5

H50 SERIES GAS FRYERS

N

CHAPTER 3: OPERATING INSTRUCTIONS

1 234 5

OTE:
Some computers
may have this
earlier style
ON/OFF Switch:

ON

OFF

c y c l c y c l

Frymaster

L1 23445

6 78

COMPUTER MAGIC III

6

COMPUTER MAGIC

78 9

0R

COMPUTER MAGIC III CONTROLLER

The Computer Magic III control panel includes the following items:

1/2. Left and Right LED Displays

1/3. Temperature Check and Program Lock Switch

4/5. Left and Right Frypot Power Switches NOTE: On single vat units, either switch will turn the

fryer on and off.
6/7. Left and Right Product Selection and Coding Keys

1/8. Program Mode Switch

COMPUTER OPERATING INSTRUCTIONS

ON

Turn the computer on by pressing the Power Switch (or ON/ OFF Switch

OFF

). NOTE: A deci-

mal between digits 1 and 2 in either LED Display indicates that the burners are on.

1. One of the following will be displayed:

a. cycl

cycl, indicating that the fryer is operating in the melt cycle mode. The fryer will remain in

cyclcycl

the melt cycle mode until it reaches 180ºF (82ºC).

3-6

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

b. hi

hi, indicating that the frypot temperature is 21ºF (12ºC) higher than the setpoint.

hihi

c. LO

LO, indicating that the frypot temperature is 21ºF (12ºC) lower than the setpoint.

LOLO

d. “- - - -,” indicating that the frypot temperature is in the cooking range. NOTE: For best re-

sults, cooking should not be attempted unless the display indicates “- - - -.”

e. help

help, indicating a heating problem.

helphelp

f. hot

hot, indicating the frypot temperature is in excess of 410ºF (210ºC).

hothot

g. prob

prob, indicating that the computer has detected a problem in the tem perature measuring and

probprob

control circuits.

2. Press a product switch to initiate a cook cycle.
a. The basket lift (on fryers so equipped) will lower the product into the frypot.

b. The display will indicate the previously programmed cook time and begin countdown.

c. If shake time is programmed, the operator will be notified of the need to shake the product

“X” seconds after the cook cycle has begun (X = amount of time programmed). An alarm
will sound, and the display will read SH#
time has been programmed, sh
canceling.

d. At the end of the cooking cycle, an audible alarm will sound, cooc

associated product switch indicator will flash. To cancel the cook alarm, press the appropri­ate switch.

e. At this time, the hold time will be displayed (if programmed greater than zero), and the

countdown will begin. When the countdown reaches zero, hD
the switch number) and an alarm will sound. The hold alarm is canceled by pressing the Pro­gramming Switch . NOTE: If the display is in use, the hold time countdown will not be
displayed.

3. To check the frypot temperature at any time, press the Temperature Check Switch once. To
check the setpoint, press the switch twice. If you suspect the temperature probe is defective,
check the temperature of the frypot with a thermometer or pyrometer to verify that the computer
readout is reasonably close to the measured reading.

sh#### will not appear during the cook cycle. The alarm is self-

shsh

SH#, where “#” will be the switch number. If no shake

SH#SH#

cooc will be displayed, and the

cooccooc

hD#### will be displayed (# will be

hDhD

4. During idle periods when the fryer is on but not in use, “- - - -” should appear in both displays. If
not, check the actual temperature and setpoint.

3-7

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

CAUTION

The electronic circuitry in your computer can be affected adversely by current
fluctuations and electrical storms. Should it fail to function or program properly for
no apparent reason, the computer should be reset by unplugging the computer and

plugging it back in. This could prevent a service call.

COMPUTER PROGRAMMING INSTRUCTIONS

ON

1. Turn the computer on by pressing the Power Switch (or ON/OFF

OFF

Switch).

2. Enter the programming mode by pressing the Program Mode Switch

. Code

Code will appear in the

CodeCode

left display. If you enter the programming mode by mistake, press the switch again to exit the
programming mode. NOTE: If you try to enter the programming mode while the computer is
cooking, the display will flash busy

busy.

busybusy

3. Enter the number 1 6 5 0 by pressing the number keys. Unless this code is entered, programming

will not be accepted. This is to prevent unauthorized persons from changing your current in­structions.

4. sp-

sp-r (Setpoint) will appear in the left display. Any previously programmed temperature setpoint

sp-sp-

will appear in the right display. To change the setpoint, enter the desired setpoint temperature
using the number keys. For CE units, the highest setpoint allowed is 370ºF (188ºC). For Non-CE

units the number is 375ºC (191ºC). Press the Program Mode Switch to lock in the new set­point (or the old setpoint, if it was not changed). If the unit is a dual vat fryer, sp-L

sp-L will appear,

sp-Lsp-L

allowing the setpoint for the left vat to be adjusted or confirmed.

5. selp

selp (Select Product) will appear in the left display. Press the product button to be programmed

selpselp

(or press

6. sens

sens (Sensitivity) appears in the left display. Any previously programmed sensitivity setting will

senssens

to return to the normal operating mode).

appear in the right display. To change the sensitivity setting, enter the new setting and press
to lock it in. If the setting was not changed, pressing accepts the previous setting.

Sensitivity is a built-in feature that adjusts cooking time to compensate for the drop in frypot
temperature when a basket of product is placed into it. Different food products will vary in
density, basket load size, and initial temperature. Food products will also vary in how long it is
required to be cooked. A proper sensitivity setting for each product will assure a high-quality
product each time. For example: four ounces of fries can be programmed to be cooked to the
same quality as two and one-half pounds. Some experimenting with the range of 0 - 9 (0 being
least sensitive and 9 being most sensitive) may be required to obtain the desired quality to meet
your specifications, but setting 5 is the recommended starting point.

3-8

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

7. cooc

cooc (Cook Time) will now show in the left display. Any previously programmed cooking time

cooccooc

will appear in the right display. Pressing
cooking time, enter the new time using the Number keys. Press

8. sh_

sh_ (Shake Time) appears in the left display. If your product requires shaking during the cook-

sh_sh_

will accept the current cooking time. To change the

to lock in the new time.

ing process, set the number of minutes to cook before shaking using the number keys.
For example, entering “30” means the product needs to be shaken after it has been cooking for 30

seconds. At the end of 30 seconds, an alarm will sound and the product switch will flash for 3
seconds. If your product does not require shaking, enter “0”. The number entered will appear in

the right display. Press to lock in the programmed time.

9. hd_

hd_ (Hold Time) will appear in the left display. Set the time the product may be held before

hd_hd_

serving, anything from 13 seconds to 60 minutes. If you do not wish to use the hold time feature,
enter 0. Press to lock in the time.

In the event the same product is being cooked in more than one basket, any product button can
be programmed to use the hold timer normally used with a different product button. Example:
Program button 3 for 7:00 minutes hold time. Then, when programming button R for hold time,
press address 4. Both product button 3 and product button R will then use the same hold time of
7:00 minutes. The button numbers and their assigned address numbers are:

Button: L 1 2 3 4 5 6 7 8 9 0 R
Address: 1 2 3 4 5 6 7 8 9 10 11 12

10. selp

selp (Select Product) will again appear in the left display. If more products are to be pro-

selpselp

grammed, return to Step 5 and follow all instructions to this point, repeating for each product.

11. When you complete your programming, lock in the whole program by pressing the Temperature

Check/Program Lock Switch .

USING THE BOIL-OUT FEATURE

CAUTION

Before using this feature, ensure the frypot is filled with a mixture of cold water and

Frymaster FRYER ‘N’ GRIDDLE cleaner or detergent.

ON

1. To program the fryer for boil-out, press the Power Switch (or ON/OFF
by the Program Mode Switch . Code

2. Enter the code number 1 6 5 3. The right display will read boil

Code will appear in the left display.

CodeCode

boil. The temperature is automatically

boilboil

OFF

Switch) followed

set for 195ºF (91ºC). The fryer will attain this temperature and remain there until the Power

3-9

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

ON

(or ON/OFF

OFF

) Switch is pressed, which cancels the boil-out mode. In high-altitude locations,
the fryer must be monitored constantly for boil-over conditions. If boil-over occurs, turn off the
fryer immediately, allow it to cool, then re-enter the boil-out mode to continue the process.

FRYER RECOVERY TIME CHECK FEATURE

The computer automatically checks the recovery time each time the frypot temperature drops below
250ºF (121ºC). To check recovery time, press the Program Mode Switch . C ode

Code will appear in the

CodeCode

left display. Enter the code number 1 6 5 2 on the number keypad. The recovery time will appear in
both displays for 5 seconds.

SELECTING FAHRENHEIT– CELSIUS DISPLAY MODE

1. The computer can display temperatures in either Fahrenheit or Celsius. To change from one to
the other, press the Program Mode Switch . Code

Code will appear in the left display.

CodeCode

2. Enter the code number 1 6 5 8 on the number keypad. The computer will toggle the temperature
display from Celsius to Fahrenheit or from Fahrenheit to Celsius.

3. Press the Temperature Check/Program Lock Switch to display the temperature in the newly
selected mode.

SELECTING FRYPOT TEMPERATURE DISPLAY MODE

1. To display the actual frypot temperature at all times, press the Program Mode Switch . Code

Code

CodeCode

will appear in the left display.

2. Enter code 1 6 5 L in both number keypads. The computer will display the actual frypot tempera­ture. NOTE: During the product cooking process, the cooking time will not be displayed, but
timing is taking place.

3. To return to setpoint display, repeat Steps 1 and 2.

3-10

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

ANALOG CONTROLLER

Frym as te r

Power

Light

Power
Switch

Heat

Mode

On

Light

ANALOG CONTROLLER

Trouble

Light

C
F

Temperature

Knob

Melt

Cycle

Light

?

SOLID STATE

Melt Cycle

Switch

Like th e C omp ut er Mag ic III, th e a nal og con tr ol le r utilizes a frypot-mounted temperature probe and
solid-state electronics mounted on the control panel. The temperature probe is connected to the con­trol circuitry via an interface board behind the control panel. Rotating the Temperature Knob to the
desired temperature sets the cooking temperature. When the Power Switch is placed in the ON posi-

tion, electrical current is supplied to the fryer’s components and the Power On Light illuminates.
Placing the Melt Cycle Switch in the ON position causes the burners to cycle on for a few seconds

and off for a longer period until the temperature in the frypot reaches 180ºF (82ºC). At that time the
unit automatically enters the heat mode, causing the burners to remain lit until the setpoint is

reached. When in the melt cycle, the Melt Cycle Light

will alternately illuminate and go out as

the burners cycle on and off.

CAUTION

Do not cancel the Melt Cycle if solid shortening is being used.

When the unit enters the heat mode, the Heat Mode Light will illuminate and remain on until the
setpoint is reached.

The Trouble Light ? will illuminate if there is an ignition failure. To reset the controller after an
ignition failure, place the Power switch in the OFF position for 30 seconds, then place it back in the
ON position. The Trouble Light is also used to indicate the presence of a probe circuit or high-limit
circuit problem.

3-11

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

Celcius or

ON/OFF

Switch

Digital

Display

Fahrenheit

Display Switch

9 . 9 9 9

Frym as te r

Heating

Mode

Indicator

DIGITAL CONTROLLER

Temperature

or Setpoint

Display Switch

Setpoint

Adjustment

Arrows

DIGITAL CONTROLLER

Melt

Cycle

Switch

On the digital controller, the thermostat knob has been replaced with a digital display and a pair of
keys for increasing or decreasing the setpoint.

Pressing the ON/OFF Switch

supplies electrical power to the fryer, and causes the controller
software version number to display for 4 seconds in the Digital Display. Following the software ver­sion number display, the SETPOINT TEMPERATURE WILL DISPLAY CONSTANTLY. Pressing
the Temperature/Setpoint Display Switch will display the actual frypot temperature.

The fryer will automatically enter the melt cycle mode and will continue to cycle on for a few
seconds and off for a longer period until the temperature in the frypot reaches 180ºF (82ºC). At that
time, it will enter the heat mode. The purpose of the melt cycle is to gradually melt solid shortening
to prevent its scorching, and to prevent creation of “hot spots” on the frypot. To cancel the melt
cycle, press the Melt Cycle Switch .

CAUTION

Do not cancel the Melt Cycle if solid shortening is being used.

NOTE: If solid shortening is not being used, the controller can be programmed to bypass the Melt

Cycle as follows: With the controller in the OFF mode, press the Melt Cycle Switch . The
display will show either a “0” (meaning that the melt cycle can be bypassed) or a “1” (meaning that

3-12

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

the melt cycle cannot be bypassed). To change the bypass option setting, press and hold the Melt
Cycle Switch for 5 to 6 seconds to toggle “0” to “1” or “1” to “0”. When the display shows the
desired setting, release the switch.

The fryer will remain in the heat mode until the setpoint is reached. The Heat Mode Indicator is a
decimal point that appears between the first two numbers of the digital display to indicate the unit is
heating. When the setpoint is reached, the decimal will go out, indicating the fryer is ready for
cooking.

To enter or change the setpoint temperature, press the Up Arrow or Down Arrow keys to raise or
lower the temperature setting. The display will change at a rate of about 1 degree per second for ap­proximately the first 12 degrees, then change to a faster rate if the arrow is continuously pressed.

The temperature can be displayed in either Fahrenheit or Celsius. To change from one to the other,
press the C/F Switch .

Digital

Display

Programming

SOLID-STATE BASKET LIFT TIMER

ON/OFF

Button

Cook Time

Buttons

Temperature

Check Button

Left
Basket
Button

BASKET LIFT TIM ER

Temperature

Check Button

Boil-Out

Button

Right

Basket

Button

ON/OFF

Button

Cook Time

Programming

Buttons

Digital

Display

The Basket Lift Timer allows the operator to specify individual cooking times for each vat and inde­pendently control the operation of each basket lift.

3-13

H50 SERIES GAS FRYERS

CHAPTER 3: OPERATING INSTRUCTIONS

Pressing the ON/OFF buttons supplies electrical power to the fryer components. The fryer will
automatically go into the melt cycle mode if the temperature in the frypot is below 180ºF (82ºC), cy­cling on for a few seconds and off for a longer period. The purpose of the melt cycle is to gradually
melt solid shortening to prevent its scorching, and to prevent the creation of “hot spots” in the frypot.
To cancel the melt cycle mode, press the Right Basket button.

The cook time for each basket is always shown in the Digital Displays except when the Temperature
Check buttons

To view the setpoint for a frypot, press the corresponding Temperature Check button . The
setpoint for the frypot will be shown in the corresponding Digital Display.

NOTE: For full pot (single vat) units, the setpoint will be shown in the right display only.
To change the setpoint, enter the new temperature using the number keys, then press the Temperature
Check button

Pressing a Basket button initiates a cooking cycle. The basket is automatically lowered into the
frypot and the cook time in the Digital Display begins to count down. When the countdown reaches
zero, the basket is raised from the frypot and a buzzer sounds to alert the operator that cooking is
completed. Pressing the Basket button silences the alarm.

are pressed. To change a cook time, enter the new time with the number keys.

again to lock in the setpoint and return to the cook time mode.

The controller also displays the following trouble messages in the Digital Display of the vat func­tioning abnormally:

• HELP

HELP is displayed continuously if there is a heating failure.

HELPHELP

• hot

hot is displayed if the frypot temperature rises above 385ºF (196ºC).

hothot

• PROB

PROB indicates a problem with the temperature probe circuit.

PROBPROB

3-14

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

4.1 Draining and Manual Filtering

DANGER
Allow oil/shortening to cool to 100ºF (38ºC) or lower before draining to an appropri­ate container for disposal.

If your fryer is not equipped with a built-in filtration system (FootPrint III or F ilter Magic II), the
cooking oil or shortening must be drained into another suitable container. (For safe, convenient
draining and disposal of used cooking oil or shortening, Frymaster recommends using the
Shortening Disposal Unit (SDU). The SDU is available through your local distributor.)

1. Turn the fryer power switch to the OFF position. Screw the drainpipe (provided with your fryer)

into the drain valve. Make sure the drainpipe is firmly screwed into the drain valve and that the
opening is pointing down.

2. Position a metal container with a sealable cover under the drainpipe. The metal container must

be able to withstand the heat of the cooking oil/shortening and hold hot liquids. If you intend to
reuse the oil or shortening, Frymaster recommends that a Frymaster
cone be used when a filter machine is not available. If you are using a Frymaster filter cone
holder, be sure that the cone holder rests securely on the metal container.

filter cone holder and filter

Frymaster

3. Open the drain valve slowly to avoid splattering. If the drain valve becomes clogged with food

particles, use the Fryer’s Friend (poker-like tool) to clear the blockage.

DANGER

DO NOT insert anything into the drain from the front to unclog the valve. Hot

oil/shortening will rush out, creating an extreme hazard.

WARNING

DO NOT hammer on the drain valve with the Fryer’s Friend. This will damage the

drain valve ball and prevent the valve from sealing securely, resulting in a leaky

valve.

4. After draining the oil/shortening, clean all food particles and residual oil/shortening from the fry-

pot. BE CAREFUL, this material may still cause severe burns if it comes in contact with bare
skin.

5. Close the drain valve securely and fill the frypot with clean, filtered or fresh cooking oil or solid

shortening to the bottom OIL-LEVEL line.

4-1

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

DANGER
When using solid shortening, pack the shortening down into the bottom of the
frypot. DO NOT operate the fryer with a solid block of shortening sitting in the upper
portion of the frypot. This will cause damage to the frypot and may cause a flash
fire.

4.2 Built-In Filtration System Operation

Bot h t he Fo o tP ri n t III ( FP III) a nd Filter Magic II (FM II) filtration systems allow the cooking oil or
shortening in one frypot to be safely and efficiently filtered while the other frypots in a battery re­main in operation. Although different in design and appearance, the operation of the FootPrint III
and Filter Magic II systems is identical. Operation of the FootPrint III syste m is illustrated in this
discussion, but the steps described apply equally to the Filter Magic II system.

Most reported problems with these systems have been found to be caused by improper operation.
Careful attention to the step-by-step instructions that follow will ensure that your system operates as
intended.

PREPARING THE FILTER UNIT FOR USE

1. Pull the filter unit from the cabinet, open the cover, remove the crumb tray, and remove the paper

hold-down ring.

4-2

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

2. After verifying that the metal filter screen is in the bottom of the pan, lay a sheet of filter paper

over the top of the pan, overlapping on all sides.

3. Position the hold-down ring over the filter paper and lower the ring into the pan, allowing the

paper to fold up around the ring as it is pushed to the bottom of the pan.

4. Sprinkle filter powder over the filter paper. (For powder quantity, see the filter powder manu-

facturer’s instructions.) Replace the crumb tray in the filter pan and close the cover.

6. Push the filter pan back into the fryer, positioning it all the way to the back of the cabinet.

(When the FM II filter assembly is properly positioned, the green HEATER ON indicator will
light.)

4-3

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

OPERATION OF THE FILTER UNIT

CAUTION
Never operate the filter unit unless the cooking oil in the fryers has been brought up
to cooking temperature.

1. To filter the cooking oil, turn the fryer power OFF,

then open the drain valve on the fryer you have
selected to be filtered. If necessary, use the Fryer's
Friend steel rod to clear the drain from inside the fry-
pot as necessary.

Drain Valve Handle

DANGER
Never drain more than one fryer at a time—the filter pan may overflow. When
unclogging a valve, DO NOT insert anything into the drain from the front of the fryer.
Hot oil/shortening will rush out, creating an extreme hazard.

WARNING
DO NOT hammer on the drain valve with the Fryer’s Friend. This will damage the
drain valve ball and prevent the valve from sealing securely, resulting in a leaky
valve.

2. When the frypot is empty, use a fryer scouring tool to remove sediment on the sides of the frypot.

WARNING

When cleaning the inside of the frypot, avoid striking the high limit thermostat and
temperature probe or operating thermostat.

3. Snap the Power Shower into the frypot.

4-4

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

DANGER

DO NOT operate the filter w ithout the Pow er Shower in pl ace unless unit is confi gured wit h
a rear flush option. Hot oil will spray out of the fryer and may cause injury.

4. After all oil has drained from the pot, push

the filter handle down and to the rear to start
the pump and begin the filtering process. (For

Filter

Handle

units equipped with a rear-flush option,
position the control lever to either the Power
Shower or Rear Flush position.) There may
be a slight delay before the pump activates.

5. After the oil is filtered, close the drain valve

and allow the fryer to refill. Let the filter run
10 to 12 seconds after bubbles appear in the
oil to clear the lines and prevent hardening of
shortening in the lines.

WARNING

The filter pump is equipped wit h a manual reset sw itch i n case the filter mot or overheats or
an electrical fault occurs. If t his switch trips, turn off pow er to the filter system and allow
the pump motor to cool 20 minutes before attempting to reset t he switch.

4-5

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

6. When the fryer is full, pull the filter handle up and to

the front to the off position. (For units equipped with
a rear-flush option, position the control lever to the
OFF position.) Remove the Power Shower and allow
it to drain.

7. Make sure the drain valve is fully closed. (If the drain

valve is not fully closed, the controller will display an
error message or a trouble light and the fryer will not
operate.) Turn the fryer ON and allow the cooking
oil/shortening to reach setpoint.

CHANGING THE FILTER PAPER

DANGER

Allow the filter pan to cool completely before attempting to change the paper.

1. Pull the filter unit from the cabinet. Remove the crumb tray and paper hold-down ring. Clean

both with a solution of hot water and dishwashing detergent.

2. Remove and discard the used filter paper. Be care-

ful, the oil-soaked paper may be very hot and
may cause burns.

4-6

H50 SERIES GAS FRYERS

CHAPTER 4: FILTRATION INSTRUCTIONS

3. Remove the metal filter screen and pan and clean thoroughly using a solution of hot water and

detergent, ensuring that all breading and food particles are removed from the pan. Allow the
screen to dry completely before reinstalling.

CAUTION
Make sure the inside of the pan is free of all food and breading particles that could
prevent filter paper from sealing against the bottom of the pan.

4. Replace the metal filter screen in the bottom of the pan and lay a sheet of filter paper over the top

of the filter pan with the paper overlapping the pan on all sides

5. Position the hold-down ring over the filter paper on top of the pan and lower the ring into the

pan, allowing the filter paper to fold up around the ring as it is pushed to the bottom of the pan.

6. Sprinkle filter powder over the filter paper. (For powder quantity and instructions, see the pow-

der manufacturer's instructions.) Replace the crumb tray in the filter pan and close the cover.

7. Push the filter back into the cabinet, making sure that it is positioned all the way to the back.

(When the FM II filter is properly positioned, the green HEATER ON indicator will light.)

4-7

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

5.1 Fryer Preventive Maintenance Checks and Service DAILY CHECKS AND SERVICE

Inspect Fryer and Accessories for Damage

Look for loose or frayed wires and cords, leaks, foreign material in frypot or inside cabinet, and any
other indications that the fryer and accessories are not ready and safe for operation.

Clean Fryer Cabinet Inside and Out

Clean inside the fryer cabinet with dry, clean cloth. Wipe all accessible metal surfaces and compo­nents to remove accumulations of oil or shortening and dust.

Clean the outside of the fryer cabinet with a clean, damp cloth soaked with dishwashi ng detergent,
removing oil/shortening, dust, and lint from the fryer cabinet.

DANGER

Never attempt to clean fryer during the cooking process or when the frypot is filled

with hot oil/shortening. If water comes in contact with oil/shortening heated to

cooking temperature, it can cause the oil/shortening to splatter and severely burn

nearby personnel.

WEEKLY CHECKS AND SERVICE

Drain and Clean Frypot

During normal usage of your fryer, a deposit of carbonized cooking oil or shortening will gradually
form on the inside of the frypot. This deposit must be periodically removed to maintain your fryer’s
efficiency.

DANGER

Allow oil/shortening to cool to 100ºF (38ºC) or lower before draining to an

appropriate container for disposal.

If your fryer is not equipped with a built-in filtration system, the cooking oil or shortening must be
drained into another suitable container. (For safe, convenient draining and disposal of used cooking
oil or shortening, Frymaster recommends using our Shortening Disposal Unit (SDU). The SDU is
available through your local distributor.)

1. Place the fryer power switch in the OFF position. Screw the drainpipe (provided with your fryer)

into the drain valve. Make sure the drainpipe is firmly screwed into the drain valve and that the
opening is pointing down.

5-1

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

2. Position a metal container with a sealable cover under the drainpipe. The metal container must

be able to withstand the heat of the cooking oil/shortening and hold hot liquids. If you intend to
reuse the oil or shortening, Frymaster recommends that our filter cone holder and filter cone be
used when a filter machine is not available. If you are using a Frymaster filter cone holder, be
sure that the cone holder rests securely on the metal container.

3. Open the drain valve slowly to avoid splattering. If the drain valve becomes clogged with food

particles, use the Fryer’s Friend (poker-like tool) to clear the blockage.

DANGER
DO NOT insert the tool into the drain from the front to unclog the valve. Hot
oil/shortening will rush out, creating an extreme hazard.

WARNING
DO NOT hammer on the drain valve. This will damage the drain valve ball and
prevent the valve from sealing securely, resulting in a leaky valve.

4. After draining the oil/shortening, clean all food particles and residual oil/shortening from the fry-

pot. BE CAREFUL, this material may still cause severe burns if it comes in contact with bare
skin.

5. Close the drain valve securely and fill the frypot with a solution of detergent and water to the

bottom OIL-LEVEL line. (Frymaster recommends the use of Frymaster Boilout Solution,
available through your local distributor, for best results.)

6. Set the thermostat to 200ºF (93ºC) or program the computer for Boil-Out (see page 3-9) and

simmer the solution for 1 hour.

WARNING
Never leave the fryer unattended during this process. If the solution overflows,
press the ON/OFF switch to the OFF position immediately.

7. After the solution has simmered for 1 hour, press the ON/OFF switch to the OFF position and

allow the solution to cool.

8. Drain the solution into a suitable container (NOT the built-in filtration system filter pan or

the Shortening Disposal Unit) and thoroughly wipe the frypot with a clean towel.

9. Close the drain valve and fill the frypot with clean, cold water and drain into a suitable container

(NOT the built-in filtrati on system filter pan or the Shortening Disp osal Unit). Repeat the
rinse process again, and then wipe frypot with a clean, dry towel.

5-2

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

DANGER
Ensure that the frypot is completely free of water before filling with cooking oil or
shortening. When the oil or shortening is heated to cooking temperature, water in
the frypot will cause splattering.

Clean Detachable Parts and Accessories

As with the frypot, a deposit of carbonized oil/shortening will accumulate on detachable parts and
accessories such as baskets, sediment trays, or fish plates

Wipe all detachable parts and accessories with a clean cloth dampened with a detergent solution.
(Frymaster recommends the use of Frymaster Fryer ‘N’ Griddle Cleaner, available through your local
distributor, for best results.) Rinse and thoroughly dry each part.

MONTHLY CHECKS AND SERVICE

Check Calibration of Analog Controller Thermostat Control Knob

(This check applies only to units equipped with Analog Controllers)

1. Insert a good-grade thermometer or pyrometer probe into the oil/shortening, with the end touch-

ing the fryer temperature-sensing probe and set the thermostat knob to frying temperature.

2. After the set temperature is reached, let the burner cycle on and off automatically three times to

allow the cooking oil/shortening temperature to become uniform. If necessary, stir to get all
shortening in the bottom of the frypot melted.

3. When the burner starts for the fourth time, the thermometer/pyrometer reading should be within

± 5ºF (2ºC) of the thermostat knob setting. If it is not, calibrate as follows:
a. Loosen setscrew in thermostat control knob until the knob will rotate freely on its shaft.
b. Rotate the knob until the index line on the knob is aligned with the marking that corresponds

to the thermometer or pyrometer reading.

c. Hold the knob and carefully tighten the setscrew.
d. Recheck the thermometer/pyrometer reading against the thermostat knob setting the next time

the burner lights.

e. Repeat steps 4.a. through 4.d. until the thermometer/pyrometer reading and knob setting

agree within ± 5ºF (2ºC). If calibration cannot be ob tained f or any reason, cal l a Factory

Authorized Service Center for assistance.

5. Remove the thermometer or pyrometer.

5-3

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

Check Computer Magic III Set Point Accuracy

(This check applies only to units equipped with Computer Magic III Controllers.)

1. Insert a good-grade thermometer or pyrometer probe into the oil/shortening, with the end touch­ing the fryer temperature-sensing probe.

2. When the computer display shows a series of four dashes “----” with no dot between the first and
second dashes (indicating that the frypot contents are within the cooking range), press the
switch once to display the temperature of the cooking oil or shortening as sensed by the
temperature probe.

3. Press the

switch twice to display the set point.

4. Note the temperature on the thermometer or pyrometer. All three readings should be within
± 5ºF (2ºC) of each other. If not, contact a Factory Authorized Service Center for assistance.

QUARTERLY CHECKS AND SERVICE

Clean Combustion Air Blower Assembly

A sheet metal shield or shield assembly prevents inadvertent access to the blower assembly. The
specific design varies depending upon the particular configuration of the fryer and the country for
which manufactured, but in all cases the shield is attached to the cabinet framing by sheet metal
screws. Remove the screws that secure the shield or shield assembly to the cabinet framing and pull
the shield out of the fryer to expose the combustion air blower assembly.

1. Disconnect the blower wiring harness and remove the blower assembly mounting nuts.

Blower

Wiring connection

assembly
mounting

nuts

5-4

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

2. Remove the three fasteners that secure the blower motor assembly to the blower housing, and

separate the two components.

Remove these faste ners.
(On black-colored FASCO
blowers the re are three
nuts. On silver-colored
KOOLTRONICS blowers
there are three screws.)

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.

Wrap the motor and wires

with plastic wrap or a

plastic bag.

BLOWER HOUSING BLOWER WHEEL

4. Remove the plastic wrap from the blower motor assembly. Reassemble the blower motor

assembly and blower housing. Reinstall the blower assembly in the fryer.

5. Reinstall the blower shield or shield assembly.

5-5

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

6. Light the fryer in accordance with the procedure described in Chapter 3, Section 3.1.

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.

Left Viewing

Port is Behind

Motor

(NOTE: Blower

shield omitted

for clarity.)

Right

Viewing

Port

The air/gas mixture is properly adjusted when the burner manifold pressure is in accordance with the
applicable table on page 5-9 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.

Adjusting Air/Gas Mixture

Non-CE Units and CE Units Built After April 1999

On the side of the blower housing opposite the motor is a plate with one or two locking nuts. Loosen
the nut(s) enough to allow the plate to be moved, then adjust the position of the plate to open or close
the air intake opening until a bright orange-red glow is obtained. Carefully hold the plate in position
and tighten the locking nut(s).

TYPICAL NON-CE BLOWER ASSEMBLY TYPICAL CE BLOWER ASSEMBLY

ON UNITS BUILT AFTER APRIL 1999

Adjusting Air/Gas Mixture

5-6

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

CE Units Built Through April 1999

CE units built through April 1999 are equipped with a shield assembly in front of the blowers. An
air shutter plate on the face of the shield assembly regulates the amount of airflow to the blower in­take. To adjust the shutter plate, loosen the locking screws and slide the shutter to the left or right as
necessary to obtain a bright orange-red glow. Carefully hold the shutter plate in position and tighten
the locking screws.

TYPICAL CE BLOWER SHIELD ASSEMB LY

ON UNITS BUILT THROUGH APRIL 1999

SEMI-ANNUAL CHECKS AND SERVICE

Clean Gas Valve Vent Tube

NOTE: This procedure is not required for fryers configured for export to CE
countries.

1. Set the fryer power switch and the gas valve to the OFF position.

2. Carefully unscrew the vent tube from the gas valve. NOTE: The vent tube may be straightened

for ease in removal.

3. Pass a piece of ordinary binding wire (.052 inch diameter) through the tube to remove any

obstruction.

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.

5-7

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

Check Burner Manifold Pressure

DANGER

Frymaster recommends that ONLY qualified service personnel perform this task.

1. On non-CE fryers, 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.

Pressure Tap Pl ug

Typical Non-CE

Valve Assembly

Typical CE Valve

Assembly

2. Insert the fitting for a gas pressure-measuring device into the pressure tap hole.

3. On non-CE fryers only, place the gas valve in the ON position.

4. 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 found on the following page.

5-8

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

CE Standard

B urn er M a nifo ld Ga s P r e s s u r e s

fo r F ry ers M a n u fa c tu red A fte r A p ril 19 9 9

Pressure (mb ar)

Single

Gas

Natural G as Lacq
(G20) at 20 m bar

Natural Gas Gronique *
(G25) at 25 m bar

Natural Gas Gronique
(G25) at 20 m bar

Butane/Propane
(G30) at 28/30 or 50 mbar

Propane
(G31) at 37 or 50 m bar

* B e lg ian G 2 5 = 7 ,0 m b a r (s in g le o r du a l)

Vat

77

10 10

10 10

17 17

20 20

Dual

Vat

CE Standard

Bu rner M anifold Gas Pressures

for Fryers M anufactured Th rough Ap ril 1999

Pressure (m bar)

Gas

Natural G as Lacq
(G20) under 20 mbar

Natural G as Gronique
(G25) under 25 mbar

Natural Gas Gronique
(G25) under 20 mbar

Propane
(G31) under 37 or 50 mbar

*

Single

Vat

76,5

10 9

10 9

20,2 18,5

Dual

Vat

* Belgian G 25 = 7,0 mb ar (single) or 6,5 (dual)

Non-CE Standard

B urner M anifold G as Pressures

Gas Pressure

Natural

LP

3" W .C.

0.73 kP a

8.25" W .C.

2.5 kPa

5-9

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

5. To adjust the burner gas pressure, remove the cap from the gas valve regulator and adjust to
correct pressure.

Non-CE

Valve

Earlier Model

CE Valve

GAS VALVE REGULATOR CAP

Later Model

CE Valve

6. 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.

5.2 Built-in Filtration System Preventive Maintenance Checks and Service

WARNING

Never operate the filter system without cooking oil/shortening in the system.

WARNING

Never use the filter pan to transport old cooking oil/shortening to the disposal area.

WARNING

Never drain water into the filter pan. Water will damage the filter pump.

The re a re no per io di c p rev en ti ve mai nt en an ce c he cks an d s er vi ces re qu ir ed fo r you r Foo tP ri nt III o r
Filter Magic II Filtration Systems other than daily cleaning of the filter pan with a solution of hot
water and detergent.

If you notice that the system is pumping slowly or not at all, verify that the filter pan screen is on the
bottom of the filter pan, with the paper on top of the screen. Verify that the o-ring(s) are present and
in good condition. For FootPrint III unit s , t he re is a si ng le o- ri n g lo c at ed o n t h e b ot t om o f t h e f ilter
pan. For Filter Magic II systems, there is an o-ring on the bottom of the pan and two on the fitting at
the inside back of the cabinet.

Immediately after each use, drain the Power Shower completely. If oil is leaking at the point where
the Power Shower plugs into the frypot, verify that the o-ring and gasket on the connection fitting are
present and in good condition. If you suspect blockage, unscrew the clean-out plugs at each corner
of the frame. Place the frame in a pan of hot water for several minutes to melt any accumulation of
solidified oil/shortening. Use a long, narrow bottlebrush with hot water and detergent to clean inside

5-10

H50 SERIES GAS FRYERS

CHAPTER 5: PREVENTIVE MAINTENANCE

the tubes. If necessary, insert a straightened paper clip or similarly sized wire into the holes in the
frame to remove any solidified shortening or other blockages. Rinse with hot water, dry thoroughly,
and reinstall the plugs before using.

O-RING

CLEAN-OUT PLUGS

GASKET

DANGER
Failure to reinstall the clean-out plugs in the Power Shower will cause hot
oil/shortening to spray out of the frypot during the filtering process, creating an
extreme burn hazard to personnel.

5-11

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

6.1 Introduction

This chapter provides an easy reference guide to some of the common problems that may occur
during the operation of your equipment. The troubleshooting guides that follow are intended to help
you correct, or at least accurately diagnose, problems with your equipment. Although the chapter
covers the most common problems reported, you may encounter problems that are not covered. In
such instances, the Frymaster Technical Services staff will make every effort to help you identify and
resolve the problem.

When troubleshooting a problem, always use a process of elimination starting with the simplest
solution and working through to the most complex. Never overlook the obvious – anyone can forget
to plug in a cord or open a valve. Most importantly, always try to establish a clear idea of why a
problem has occurred. Part of your corrective action involves taking steps to ensure that it doesn’t
happen again. If a controller malfunctions because of a poor connection, check all other connections
while you’re at it. If a fuse continues to blow, find out why. Always keep in mind that failure of a
small component may often be indicative of potential failure or incorrect functioning of a more
important component or system.

Some of the troubleshooting actions recommended in this chapter involve removing suspect
components and substituting components that are known to be good. Whenever this in indicated,
refer to Sections 6.4 and 6.5 for specific instructions.

Each guide begins with a description of a common problem in a six-sided figure. Simply follow the
arrows and answer the questions to determine the corrective action to take. If you are in doubt as to
the proper action to take, do not hesitate to call the Frymaster Technical Service Department or your
local Frymaster Factory Authorized Service Center for assistance.

Before calling a servicer or the Frymaster HOTLINE [phone]):

• Verify that electrical cords are plugged in and that circuit breakers are on.

• Verify that gas line quick-disconnects are properly connected.

• Verify that any gas line cutoff valves are open.

• Verify that frypot drain valves are fully closed.

DANGER

Never attempt to move a fryer containing hot cooking oil/shortening or to transfer hot
cooking oil/shortening from one container to another.

DANGER

Use extreme care when testing electrical circuits. Live circuits will be exposed.

WARNING

Inspection, testing, and repair of electrical equipment should be performed only by
qualified service personnel. The equipment should be unplugged when servicing,
except when electrical tests are required.

6-1

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

6.2 Troubleshooting Fryers and Controllers

BURNER(S)

WON'T LIGHT.

Verify unit is plugged in

Are any

control panel lights

illuminated?

Yes

Verify gas valve(s) is/are

in ON position (Non-CE
units) and that main gas
supply valve is open. If

unit is equipped with

built-in filtration system,

verify drain valve(s) is/are

fully closed. Press

ON/OFF switch OFF,

then back ON.

No

with main circuit breaker

in ON position. Press

ON/OFF switch OFF,

then back ON.

Yes

Did

burner(s) light?

No

Did

burner(s) light?

No

Press ON/OFF switch
OFF. Disconnect gas

line quick-disconnect
fitting and reconnect.

Press power switch

ON, wait 30 seconds,
turn power switch OFF.
Repeat 3 more times to

purge air from gas line.

Did

burner(s) light?

No

Open control

Yes

Yes

Problem

resolved.

panel. Is 12V LED on

interface board

illuminated?

Yes

Press power switch

OFF, disconnect unit

from electrical power,

unplug controller wiring

harness from interface

board. Wait one

minute. Reconnect

controller wiring

harness, reconnect unit

to electrical power,

press power switch ON.

Yes

LEDs 2 & 5 (Full Vat) or 1 &

Did

burner(s) light?

No

Open

control panel. Are

2 and 4 & 5 (Dual Vat)

illuminated?

No

Turn unit OFF and

disconnect from

electrical power.
Replace fuses in
ignition modules.

Reconnect unit to

electrical power. Press

ON/OFF switch ON.

No

Yes

Plug unit into a

live circuit.

on interface board

No

Is 24V LED

illuminated?

No

Is the outlet

unit is plugged

into live?

Yes

Yes

Did

burner(s) light?

Yes

Problem

resolved.

6-2

No

Problem is beyond

scope of operator

troubleshooting.

Call FASC or

Frymaster Service

Department.

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

Troubleshooting Fryers and Controllers (Continued)

CANNOT

CONTROL FRYPOT

TEMPERATURE

ACCURATELY.

What are the

symptoms?

ANALOG CONTROLLER

POWER LIGHT AND

TROUBLE LIGHT ON, BUT

NO HEAT LIGHT or CM III

SHOWS "PROB" IN DISPLAY

Turn unit OFF and disconnect

from electrical power. Replace

controller with another known to

be working. Reconnect unit to

electrical power. Turn unit ON.

UNIT STAYS IN MELT

CYCLE (BURNER ON
FOR 6 SECONDS AND
OFF FOR 24 SECONDS

CONTINUOUSLY)

Is temperature

above 180 degrees F (82

degress C)?

No

If condition persists for

more than 45 minutes, call

Service Technician or

Frymaster Service

Department.

CM III DISPLAYS "oHI"
AS IT COMES OUT OF

MELT CYCLE or HEATING

MODE INDICATOR DOES

NOT COME ON AT ALL

Enter

setpoint.

controller wiring harness from interface

unit to electrical power. Turn unit ON.

Problem

resolved.

Yes

Has setpoint

No

been properly

entered?

Yes

Press power switch OFF, disconnect

unit from electrical power, unplug

board. Wait one minute. Reconnect
controller wiring harness. Reconnect

Does fryer

Yes

operate properly?

No

Turn unit OFF and disconnect

from electrical power. Replace

controller with another known to

be working. Reconnect unit to

electrical power. Turn unit ON.

HEATING MODE

INDICATOR ON, BUT

FRYER NOT HEATING

PROPERLY

Yes

Does

burner come on

at all?

No

Refer to

Troubleshooting Guide

BURNER DOES NOT

LIGHT.

Does fryer

operate properly?

No

Problem is beyond

scope of operator

troubleshooting.

Call FASC or Frymaster

Service Department.

6-3

No

Is fryer operating

properly?

Yes

Yes

Problem is

defective

controller.

Order

replacement from

FASC.

No

Does

burner come on

at all?

Yes

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

Troubleshooting Fryers and Controllers (Continued)

CM III WILL NOT GO

INTO PROGRAMMING

MODE (DISPLAY IS

NOT BLANK).

Turn unit OFF. Disconnect unit from

electrical power. Open control panel

and disconnect 15-pin plug from back

of computer. Wait one minute.

Reconnect 15-pin plug and close

control panel. Press power switch ON.

Will computer

go into programming

mode?

No

Turn unit OFF. Disconnect unit from
electrical power, open control panel,

remove computer and replace with

another known to be working. Close

control panel. Reconnect unit to

electrical power. Turn unit ON.

Does

replacement computer

operate properly?

No

Problem is beyond

scope of operator

troubleshooting.

Yes

Yes

Verify setpoint and

product settings are correct.

Re-enter settings if

necessary.

Problem is a
defective computer.
Order replacement

from FASC.

Call FASC or Frymaster

Service Department.

6-4

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

6.3 Troubleshooting the Built-in Filtration System

PUMP WON'T

START.

Verify that filter power
cord is plugged in and

that circuit breaker is

on.

PUMP

STOPPED DURING

FILTERING PROCESS AND

WON'T RESTART.

Is pump motor hot (cannot

hold hand on pump)?

Yes

Allow motor to cool for at least 45

minutes then press thermal

overload switch reset button and

move filter handle to ON position.

Did pump

start and continue

to run?

Yes

Does pump start

if a different filter handle

is activated?

No

Yes

What happened?

No

Move filter handle to OFF position.

Allow oil/shortening to cool, then

No

empty pan and verify that filter paper

and screen have been properly

installed and are clean. Refill pan and

move filter handle to ON posistion.

Probable cause is failed

filter handle microswitch. Call

FASC or Frymaster Service

Department.

PUMP WON'T

START AFTER BEING

OFF FOR AT LEAST

ONE HOUR.

Press thermal overload
switch reset button and

move filter handle to ON

position.

Did pump

No Yes

start and continue

to run?

Problem

resolved.

Problem

resolved.

Probable causes are a

failed 24-volt transformer or

a defective motor. Call FASC

or Frymaster Service

Department.

Yes No Yes

connected at both ends and free of

harness. Order replacement from

Did pump

start and continue

to run?

Is filter

wiring harness properly

cuts, breaks, or other signs of

damage?

No

If filter harness is properly

connected but is damaged,

probable cause is failed wiring

FASC or call Frymaster

Service Department.

NoYes

pump blockage. Pump blockages

are usually caused by sediment build-up

in the pump due to improperly sized or

installed filter paper. Call FASC or

Did pump

start and then abrubtly

stop?

No

Did motor hum

for a short time and then

stop?

Yes

Probable cause is a

Frymaster Service Department.

6-5

Reset thermal overload

switch. Remove filter

pan and move handle to

ON position.

Does pump

No

run okay?

Yes

Probable cause is a

blockage of the filter pan suction

tube. Remove blockage using a thin,

flexible wire and attempt to operate filter.

If unable to remove blockage, call

FASC or Frymaster Service

Department.

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

Troubleshooting the Built-in Filtration System (Continued)

PUMP STARTS, BUT
NO TRANSFER TAKES
PLACE OR TRANSFER

IS VERY SLOW.

Move the filter handle to the OFF

position. Allow oil/shortening to

Is pumping erratic

(spitting/spurting)?

Yes

Move filter handle to OFF position. Allow

oil/shortening to cool, then empty pan. For Filter

Magic and FootPrint II units, verify that o-ring on

pan outlet is present and in good condition. Verify

that the o-ring on the oil return fitting at the inside

rear of the cabinet is present and in good

condition. Verify that filter paper and screen have

been properly installed and are clean. Refill the

filter pan and move filter handle to the ON position.

Is oil/shortening

Yes

being returned to the

frypot?

No

No

cool, then empty the filter pan.

Verify that the Power Shower is

installed, if so equipped. Move the

filter handle to the ON position.

Probable cause is

improperly

installed/prepared filter

pan components.

stream of air being

pumped out of Power Shower

Yes

port (or rear flush port, if so

configured)?

Is a strong

No

Problem

resolved.

If unable to clear

blockages, call

FASC.

Probable cause is solidified

oil/shortening in the filtration unit

return lines. Move filter handle to

the OFF position, refill filter pan,

wait 10 minutes, then move filter

handle to ON position.

Is oil/shortening

Yes

being returned to the

frypot?

No

Probable causes are solidified oil/shortening in

filtration unit return lines or blockage of return line

suction tube on bottom of filter pan. A blockage of

the return line suction tube is usually due to

sediment/food particle build-up caused by failure

to use crumb tray and the use of improperly sized

or installed filter paper. Failure of solidified

oil/shortening in the return lines to melt indicates a

defective heater tape or 24 volt transformer.

6-6

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

Troubleshooting the Built-in Filtration System (Continued)

POWER SHOWER

NOT SPRAYING

PROPERLY.

How much oil is

coming out of the

Power Shower?

Little or none, but

it is squirting out

around gasket.

Probable causes are power

shower holes plugged with

debris or solidified

oil/shortening in the Power

Shower tubing.

Move the filter handle to the OFF Position and

remove Power Shower. Remove the clean-out plugs

and place the unit in a pan of hot water for several

minutes to melt the oil/shortening. Insert a

straightened paper clip or similarly sized wire into

each hole to clear any blockages. Replace and

tighten clean-out screws. Verify that gasket and

o-ring are in place and in good condition.

Completely dry, then reinstall

the Power Shower, ensuring

that it seats properly in its
receptacle. Move the filter

handle to the ON position.

Little or none, and
nothing is squirting
out around gasket.

Oil/shortening is not reaching

the Power Shower. Ensure that the

Power Shower receptacle in the frypot

is not obstrutcted. If it is clear, refer to

the Trouble Shooting Guide

on page 6-6.

Plenty, but it is

also squirting out

around gasket.

Probable causes are

missing/worn o-rings and

gasket on Power Shower or
no filter paper in the filter pan
(causing too much pressure).

Replace o-rings and

gasket or install filter

paper, whichever is

appropriate.

Is the Power

Shower spraying

properly?

No

Yes

Problem

resolved.

Problem is beyond

scope of operator

troubleshooting. Call FASC or

Frymaster Service

Department.

6-7

Yes

Is Power

Shower spraying

properly?

No

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

Troubleshooting the Built-in Filtration System (Continued)

AFTER FILTERING, FRYER

DOES NOT OPERATE PROPERLY.

ANALOG CONTROLLER TROUBLE

LIGHT ON or CM III COMPUTER

DISPLAY SHOWS "HELP".

Verify that drain

valve is fully

closed.

Is fryer operating

properly?

No

Refer to Troubleshooting

Guides in Section 6.2.

Yes

Problem

resolved.

6.4 Replacing the Ignition Module Fuse

1. Disconnect the fryer from the electrical supply.

2. Remove the two screws in the upper corners of the control panel and swing the panel open from

the top, allowing it to rest on its hinge tabs.

3. Using a fuse-puller, remove the 3-amp fuse located on the left side of the ignition module.

4. Replace the fuse, close the panel, replace the control panel screws.

5. Reconnect the fryer to the electrical supply.

6.5 Replacing the Controller or Controller Wiring Harness

1. Disconnect the fryer from the electrical supply.

2. Remove the two screws in the upper corners of the control panel and swing the panel open from

the top, allowing it to rest on its hinge tabs.

6-8

H50 SERIES GAS FRYERS

CHAPTER 6: OPERATOR TROUBLESHOOTING

3. Disconnect the wiring harness from the back of the controller and, if replacing the harness,

disconnect it from the interface board.

4. Disconnect the ground wire from the controller, and remove the controller by lifting it from the

hinge slots in the control panel frame.

5. Reverse the procedure to install a new controller or wiring harness.

Ignition Modules

Interface Board

Connection

Wiring Harness

Fuse

Controller

Connection

6-9

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.1 Functional Description

H50 Series 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 their 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 relatively 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 24VAC gas
valve systems, and all are configured with electronic ignition.

THE ELECTRONIC IGNITION SYSTEM

An ignition module mounted in the component box or

Inside the Ignition Module

“shield” (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

Out to
Gas Valve

To Alarm

spark, supplies voltage to the gas valve, and proofs the
burner flame. The module contains a 4-second time delay
circuit and a coil that activates the gas valve. Two types

25 V +

Coil

are in use. A closed-box design is used in units built for
the U.S. market, while the unit used in many units built for
export resembles an interface board.

GND

TD

HV

The ignitor assembly consists of a spark plug, an
enrichment tube, and a flame sensor.

Ignition Wire 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 controller or 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 6 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 then close electronic switches in the 24 VAC circuit to
provide current to the ignition module. Circuitry in the ignition module sends 24VAC to the gas

7-1

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

valve via a normally closed high-limit switch (and, in fryers with built-in filtration systems, a
normally closed drain safety switch). Simultaneously, the module causes the ignitor to spark for 4
seconds to light the burner. A flame sensor verifies the burner is lit 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 controller 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.

H50 Series fryers may be equipped with solid-state analog controls, digital controls, basket lift tim­ers, or Computer Magic III computers.

All fryers in this series have an interface board located in the component box located 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. The H50 Series of fryers has been in production since 1983. Consequently, servicers
are likely to encounter several different interface board designs. Although the boards differ in ap­pearance, basic functioning and electrical connections are the same from one to another. With the
exception of manufactured gas units, no matter what generation board is in the fryer now, if it be­comes necessary to replace the board, P/N 806-3398 is the replacement part that will be installed.
The two boards most likely to be seen (i.e., the two latest designs) are illustrated below.

GND

J1

GND

V2D

PWR

AD
AS

V2S

3 6 9 12

2 5 8 11

1 4 7 10

SOUND

1
2
3

GND GV PWR

EARLIER DESIGN INTERFACE BOARD P/N 806-3398

J2

K4

K3 K5

LEFT

LIFT

RELAY

HEAT

RELAY

AL 12V

BLOWER

MOTOR

RELAY

K1 K2

BASKET

12 6 3 45

AIR

13

10741

11852

14

15

12963

RIGHT

BASKET

RELAY

RELAY

24V AL

LIFT

HEAT

PWR

J3

GV

GND

3 6 9 12

2 5 8 11

1 4 7 10

GND

GND
V1D
PWR
ALR
V1S

GND

J1

GND

V2D

PWR

AD
AS

V2S

SOUND

1
2
3

3 6 9 12

2 5 8 11

1 4 7 10

D1

D2

GND

LATER DESIGN INTERFACE BOARD P/N 806-3398

GV

PWR

J2

K1

LEFT

BASKET

LIFT

RELAY

HEAT

RELAY

AND

BLOWER

MOTOR

RELAY

D3

K2 K3

24V

10741

11852

12963

K4

13

14

D6

15

12V

RIGHT

BASKET

LIFT

RELAY

HEAT

RELAY

AND

BLOWER

MOTOR

RELAY

3 6 9 12

2 5 8 11

1 4 7 10

Blower
Motor
2 Amp

D4

PWR

GND

GND

D5
GV

D7

AIR

J3

GND
V1D
PWR
ALR
V1S

7-2

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

FREQ UE NT LY U SED TEST P O INTS FO R INTE R FACE B O ARD P/N 806-3398

Meter

Test Setting Pins Results

12VAC Power to Controller 50VAC Scale 1 and 3 on J3 or J2 12-18
24VAC Power to Right Module 50VAC S cale 8 on J3 and G RO U N D 22-28
24VAC Power to Left Module 50VAC Scale 8 on J1 and G R O U N D 22-28
120 VAC Po w er 250VAC Scale 11 on J3 and GROUN D 110-125
120 VAC Po w er to Blowers 250VAC Scale 12 on J3 and GROUND 110-125
24VAC Power to Right High-Limit 50VAC Scale 9 on J3 and G R OUND 22-28
24VAC Power to Left High-Limit 50VAC Scale 9 on J1 and GR O U N D 22-28
Probe Resistance (Right) *
Probe Resistance (Left) * R x 1000 OHMS 2 and 6 on J1 or 14 and 15 on J2 **
Probe Isolation R x 1000 O H M S 6 on J1 or J3 and GROUND ***
High-Limit Continuity (Right) R x 1 OH M 9 on J3 and W ire 13C on Gas Valve 0
High-Limit Continuity (Left) R x 1 OHM 9 on J1 and Wire 12C on Ga s Valve 0

** Disconnect 15-pin harness from controller before testing probe circuit.

** See Probe Resistance Chart at end of chapter.
*** 5 mega-Ohms or greater.

R x 1000 O H M S 2 and 6 on J3 or 13 and 14 on J2 **

This standard interface board is also used in a number of fryer types besides the H50 Series. The in­formation contained in this section applies to H50 Series applications ONLY.

The earlier design board contains two heat relays (K1 and K2) that switch 24 VAC to the ignition
and gas valve circuits when the computer/controller heat logic circuit calls for heat. The basket lift
relays (K3 and K5) switch 120 VAC to the basket lift motors when signaled by the com­puter/controller. Relay K4 switches 120 VAC to the blower motor when either K1 or K2 closes.
The relays on this board are soldered on – if one fails, the whole board must be replaced.

The newer design board has only four relays. In this design, K2 and K3 are double-pole-double
throw (dpdt) relays that supply 24 VAC to the ignition and gas valve circuits, as well as 120 VAC to
the blower motor. Relays K1 and K4 supply 120 VAC to the basket lift motors. The relays on this
board plug into sockets. If a relay fails, the relay can be replaced.

All interface boards have LEDs to assist in troubleshooting. On the earlier design board, nine LEDs
are arranged along the bottom. Later versions have six LEDs at various locations around the board.

EARLIER DESIGN INTERFACE BOARD

LED DIAGNOSTIC LIGHTS

12V I ndi cates 12 VAC from t ransformer
24V I ndi cates 24 VAC from t ransformer

GV I ndi cates 24 VAC to gas valve (lef t or right)

PWR Indicates 24 VAC to module (left or right)

AL Indicates module lock-out (left or ri ght)

AIR CE units: air switch cl osed. Others: no meaning

LATER DESIGN INTERFACE BOARD

LED DIAGNOSTIC LIGHTS

1 24 VAC to lef t gas valve (dual vat only)
2 24 VAC to left ignition module
3 24 VAC from transformer
4 24 VAC to right i gni tion module
5 24 VAC to gas valve (ri ght valve if dual vat)
6 12 VAC from transformer

7-3

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

INTERFACE BOARD

12 VAC TO CPTR

GROUND

COMPUTER (12 VAC)

COMPUTER

COMPUTER 12 VDC TO RELAYS
COMPUTER LT HT RELAY

COMPUTER

NOT USED NOT USED

COMPUTER LT BL REL A Y

RT ALARM OUT

COMPUTER SOUND DEVICE

LT ALARM O UT

COMPUTER
COMPUTER

COMPUTER

1
2
3
4
5
6
7
8
9

**

10
11

*

12
13
14
15

J1

NOT USED NOT USED

NOT USED

TEMP PROBE

BASKET LIFT (DN)

24 VAC IN

MAIN GAS VALVE

via HLS via HLS

BASKET LIFT (UP)

NOT USED NOT USED
NOT USED NOT USED

1
2
3
4
5
6
7
8

9
10
11
12

J3 PIN 1

GROUND

J3 PIN 3

RT HT RELAY

RT BL RELAY

ALR (RIGHT)

AD (LEFT)

J3 PIN 6

J1 PIN 2 & J3 PIN 2

J1 PIN 6

J2 PIN 14TEMP PROBE
NOT USEDNOT USED
NOT USED
NOT USEDNOT USED

J2 PIN 15

LT B L R EL AY

PWR vi a LT HT RELAY

V2D

LT B L R EL AY

** Dual Vat configurations

** Full Vat configurations

J2 PIN 1

J2 PIN 14 TEMP PROBE

J2 PIN 3
NOT USED

NOT USED NOT USED

J2 PIN 13

RT BL RELAY BASKET LIFT (DN)

PWR via RT HT RELA Y

V1S OR V1D

RT BL RELAY

BLOWER via K4 (o ld)

or K2/K3 (new)

BLOWER XFMR BOX

J3

1
2
3
4
5
6
7
8

9
10
11
12

J2

12 VAC XFMR

12 VAC XFMR

NOT USED

TEMP PROBE

24 VAC IN
MAIN GAS VALVE
BASKET LIFT (UP)

120 VAC IN

MOD 25V GROUND GROUND

MOD V2D

MOD 25V TERM

DRAIN SWITCH (OPT)

NOT USED NOT USED

NOT USED NOT USED

GND

V2D

PWR

AD
AS

V2S

J1 PIN 9

J1 PIN 8 vi a LT HT REL A Y

J2 PIN 12

LEFT VAT FULL OR RIGHT VAT

GROUND MOD 25V GROUND

J3 PIN 9

J3 PIN 9

CURRENT FLOW THROUGH

INTERFACE BOA RD 806-3398

7-4

GND

V1D

PWR

ALR
V1S

MOD 25V TERMJ3 PIN 8 via RT HT RELAY

DRAIN SWITCH (OPT )J2 PIN 10

MOD V1D

MOD V1S

*

**

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

THERMOSTATS

All fryers in the H50 Series have temperature probes located on the front centerline of each the fry-

pot. (Dual vat frypots have a probe in each vat.) In this type 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 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.

H50 Series 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 configured models, and are not interchangeable.

7.2 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 in Chapter 4 of this manual 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.

7.3 Cleaning the Gas Valve Vent Tube (Non-CE Units Only)

Refer to Semi-Annual Checks and Service in Chapter 5, Preventive Maintenance.

7.4 Checking the Burner Manifold Gas Pressure

Refer to Semi-Annual Checks and Services in Chapter 5, Preventive Maintenance.

7-5

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.5 Measuring Flame Current

When the burner flame is properly adjusted, it will produce a current between 3.5 µA and 6.5 µA.
Flame current is measured by placing a microamp (not milliamp) meter in series with the white

sensing wire on the ignitor. This is accomplished as follows:

1. Place the fryer power switch in the OFF position.

2. Disconnect the white 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.

7.6 Replacing Fryer Components

7.6.1 Replacing the Controller or the Controller Wiring Harness

Refer to Chapter 6, Section 6.6 for this procedure.

7.6.2 Replacing the Temperature Probe or High-Limit Thermostat

1. Disconnect the fryer from the electrical supply.

2. Drain cooking oil/shortening below the level of the probe or thermostat.

3. Remove the screws from the upper corners of the control panel and swing the panel open from
the top, allowing it to rest on its hinge tabs.

4. Unplug the controller wiring harness from the back of the controller.

5. Remove the controller by lifting it from the hinge slots in the control panel frame.

6. If fryer has a built-in filtration system, loosen the bolt securing the oil return handle to the oil re-

turn operating rod.

7. Disconnect the ignition cables from the ignitors by grasping the boots and gently pulling toward

you.

8. Remove the component box mounting screws.

7-6

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

9. Rotate the top of the component box out of the frame and carefully pull it out enough to discon-

nect the wiring harness plug(s) from the back of the box.

10. Remove the box and set it aside.

11. Make a note of the location of the existing wires. Using a pin-pusher, disconnect the temperature

probe wires (or high-limit thermostat wires) from the connector plug.

12. Unscrew and remove the temperature probe (or high limit thermostat) from the frypot.

13. Apply Loctite

®

PST56765 pipe thread sealant or equivalent to the replacement part threads.

14. Screw the replacement part into the frypot.

15. Connect the wires from the new component to the connector plug, referring to the note made in

step 11.

16. Reverse steps 1 through 9 to complete the procedure.

7.6.3 Replacing the Interface Board

1. Remove the component box per steps 1 through 10 of Section 7.6.2.

2. Unplug the controller wiring harness from the interface board.

3. Disconnect the wires attached to the interface board, marking or making a note of the wires and

terminals to facilitate reconnection.

4. Remove the nuts at each corner of the interface board and pull it from the studs.

5. Reverse the procedure to install the replacement board, being sure to reinstall the spacers behind

the interface board.

7.6.4 Replacing an Ignition Module

1. Disconnect the fryer from the electrical supply.

2. Remove the screws from the upper corners of the control panel and swing the panel open from

the top, allowing it to rest on its hinge tabs.

3. Disconnect the wires from the ignition module, marking or making a note of the wires and termi-

nals to facilitate reconnection.

4. Remove the four ignition module screws and pull the module from the component box.

7-7

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

5. Reverse the procedure to install the replacement module.

7.6.5 Replacing an Ignitor Assembly

DANGER

Drain the frypot or remove the handle from the drain valve before proceeding further.

1. Disconnect the fryer from the electrical supply.

2. Disconnect the ignition cable from the ignitor by grasping the boot and gently pulling toward

you.

3. Remove the sheet metal screw securing the ignitor to the mounting plate and pull the ignitor from

the fryer.

4. Reverse the procedure to install the replacement ignitor.

7.6.6 Replacing a Combustion Air Blower

Refer to Chapter 5, Quarterly Checks and Service, Clean Combustion Air Blower Assembly for
blower removal and replacement procedures.

7.6.7 Replacing a Gas Valve

DANGER

Drain the frypot or remove the handle from the drain valve before proceeding further.

1. Disconnect fryer from electrical and gas supplies.

2. Disconnect the wires from the gas valve terminal block, marking each wire to facilitate recon­nection.

3. Remove the vent tube and the enrichment tube fitting from the valve.

4. Disconnect the flexible gas line(s).

5. Carefully unscrew the valve from the manifold. NOTE: Some models may have the valve at-

tached to the manifold by means of a pipe union. In such cases, remove the valve by uncoupling
the union.

6. Remove all fittings from the old gas valve and install them on the replacement valve, using Loc-

®

tite

PST56765 or equivalent pipe thread sealant.

7-8

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

®

7. Apply Loctite

PST 56765 or equivalent pipe thread sealant to the threads of the manifold (or

union). Reverse steps 1-5 to install the replacement gas valve.

7.6.8 Replacing a Burner Assembly

DANGER

Drain the frypot or remove the handle from the drain valve before proceeding further.

1. Disconnect the unit from the electrical and gas supplies.

2. Remove the combustion air blower per the procedure found in Chapter 5, Quarterly Checks and

Service, Clean Combustion Air Blower Assembly.

3. Remove the four nuts from the air plenum assembly and pull the assembly straight out toward

you until it clears the burner tubes.

NOTE: On a dual vat fryer, it will be necessary to remove the drain valve handles before the

plenum can be removed.

NOTE: If the flexible oil return lines are blocking the plenum, carefully bend them upward

enough to clear the plenum.

4. Disconnect the ignition cables from the ignitors by grasping their boots and pulling gently toward

you.

5. Disconnect the flexible gas lines from the burner orifices and ignitor assemblies.

6. Remove the four ¼” (6mm) nuts securing the outer front covers to the frypot assembly.

7. Remove the sheet metal screws at the top of the outer front covers and pull the covers straight out

toward you until clear of the mounting studs.

8. Remove the washers and tubular spacers from the mounting studs, then pull the inner covers

straight out toward you until clear of the mounting studs.

9. Grasp the burner firmly and pull it toward you until it clears the burner channels, taking care not

to damage the ceramic tiles in the process.

10. Clean all debris from the burner channels and combustion area.

11. Inspect the upper and lower burner rails for cracked or burned out welds.

7-9

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

a. If the welds in the lower rail are cracked or burned out, the frypot must be replaced. Refer to

Section 7.6.9 for procedure.

b. If the welds in the upper rail are cracked or burned out, the upper rail must be replaced. Re-

fer to Section 7.6.10 for procedure.

12. Place a new insulating strip along the top, rear, and bottom edge of the burner and carefully slide

it straight into the rails.

NOTE: Use P/N 826-0931 for full vat frypots and P/N 826-0932 for dual vat frypots.

13. Reverse steps 1 through 8 to reassemble the components.

14. 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.

15. Visually examine the burner flame. The color and intensity on both sides should be the same.

16. Use an inspection mirror to check for leaks in areas that cannot be directly observed.

17. If a leak is detected, tighten all the lower insulation retainer nuts, allow the frypot to run for five

additional minutes, and repeat steps 15 and 16.

18. 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 15 through 17. Repeat this step

until no leakage is detected.

7.6.9 Replacing the Frypot

1. Drain cooking oil/shortening from the frypot.

2. Remove all accessories, e.g., frypot covers, basket lift arms, etc. from the fryer.

4. Disconnect the fryer from gas and electrical supplies.

5. Remove the screws from the top cap above the control panel and lift it up and off the fryer(s).

6. Remove the screws from the upper left and right corners of the control panel. Open the panel,

disconnect the controller wiring harness and ground wire. Remove the controller from the fryer.

7. Disconnect the ignition wires from the ignitor plugs by grasping their boots and gently pulling

toward you.

7-10

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

8. Remove the screws securing the component box to the frame, and then rotate the top of the box

forward and out of the fryer enough to disconnect the wiring harness connector plug(s) on the
rear of the box. Set the component box aside.

9. Using a pin pusher, remove the temperature probe and high-limit thermostat wires from the

plug(s), marking each wire to facilitate re-assembly.

10. Remove the cover from the safety drain switch, disconnect the wires from the switch, and pull

them out of the switch box.

11. If installed, remove the section(s) of square drain from the drain valve(s) of the frypot to be re-

moved.

12. Disconnect the gas lines from the burner orifices and ignitor assemblies.

13. Remove the frypot hold down bracket.

14. Remove the screws from the flue cap sides and back and lift it clear of the fryer(s).

15. Disconnect the oil return line(s), if installed, from the frypot to be removed.

16. If removing either of the leftmost frypots of in a unit with FootPrint III filtration built after July

1997, remove the screws securing the rear oil return manifold to the frypot.

17. Carefully lift the frypot from the fryer cabinet.

18. Remove the drain valve(s), temperature probe(s), high-limit thermostat(s), and ignitor assem-

blies. 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, but this remains the customer’s decision.

19. Reverse steps 1-17 to reassemble fryer.

20. Perform steps 14 through 18 of Section 7.6.8 to ensure that there are no leaks in the burner insu-

lation.

CAUTION

Before installing temperature probe, high-limit thermostat, and drain valve on

replacement frypot, clean their threads and apply Loctite® PST56765 thread sealant

or equivalent.

7-11

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.6.10 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 on page 7-13 for component identification.

1. Remove the frypot per Section 7.6.9.

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).

11. Remove the upper burner rails (11).

NOTE: For the following steps, refer to the frypot exploded view on page 7-14 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 combustion chamber insulation (1) in the front and rear corners of

both upper rail-retaining slots.

14. Use a small amount of furnace or muffler repair cement to seal the gaps at each end of both lower

rails. (See inset, page 7-14.)

7-12

Spacer

10

CHAPTER 7: SERVICE PROCEDURES

7-13

2

3

Spacers

8

4

6

5

Disassembling A Frypot

7

11

1

9

H50 SERIES GAS FRYERS

(Full Vat Illustrated)

6

5

7-14

20

Apply cement

here

19

17

16

15

14

24

13

23

12

21

11

22

10

4

CHAPTER 7: SERVICE PROCEDURES

H50 SERIES GAS FRYERS

1

2

8

1

3

9

7

18

Re-assembling A Frypot

(Full Vat Illustrated)

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

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.

21. Insert the burners (9) into the rails to ensure the rail spacing and alignment are correct. The

burner should slide freely into and out of the rails. The upper rail can be bent slightly to increase
or decrease tension on the burner, and the edges of the slot can be closed or opened slightly to
best fit the burner frame.

22. Carefully wrap a strip of burner insulation (8) tightly around the rear and sides of the burner

frame (9), with the glass-tape side of the strip on the outside. Do not use duct tape or adhesive
to secure the strip to the burner frame.

23. Align the burner to the burner rails while maintaining tension on the insulation strip. Insert the

burner at a slight angle and begin pushing the burner slowly into the rails until it contacts the rear
combustion chamber. The fit should be snug, but not excessively tight.

24. Verify that the burners are flush with the front edge of the burner rails. Remove the excess

burner insulation by cutting with a knife or diagonal pliers. Do not try to tear the insulation!

7-15

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

25. Insert the upper front insulation (10) into its retainer (11), making sure that the holes in each

piece are aligned with one another. Install the assembly with the insulation side toward the fry-

pot and secure with ¼”-20 washer-nuts. Do not over tighten.

26. Place a washer on each of the four lower studs on the front of the frypot. Install the lower inner

front insulation (12) with the rectangular openings toward the drain valve nipple. Install the
lower inner front insulation retainer(s) (13).

NOTE: Full vat units have a two-piece insulation retainer. Dual vat units have a one-piece re-

tainer.

27. If necessary, replace the sight-glasses and insulation (14).

28. Place one washer and one 1.888-inch spacer (15) on each stud.
NOTE: There are three different sizes of spacers. Verify the size to ensure the correct spacers

are installed.

29. Insert the front lower insulation (16) into the front lower insulation retainer(s) (17) and install

assembly on frypot. Secure with ¼”-20 washer-nuts. If frypot uses two retainers, connect them
together with two ¼” self-tapping screws.

NOTE: Full vat units have a two-piece insulation retainer and two pieces of insulation. Dual

vat units have one-piece components.

30. Return to the rear of the frypot and fully tighten all washer-nuts.

31. Remove and replace the plenum gaskets (18).

32. Place a 0.938-inch spacer (19) on the plenum-mounting studs, and mount the plenum (20). En-

sure the gaskets are clear of the burner tubes by pulling the plenum back slightly. Place a washer
on each stud and secure plenum with ¼”-20 lock-nuts.

33. Install the upper oil-zone insulation (21) by pressing it under the upper combustion chamber

metalwork. Secure the insulation with the bracket (22) and ¼” self-tapping screws.

34. Install the upper burner rail blanket insulation (23). Position any excess insulation toward the top

of the frypot. Avoid overhang past the bottom of the upper burner rail. Overhang in this area
will make future burner replacement more difficult.

35. Cover the insulation with the insulation retainer (24), and secure with ¼” self-tapping screws.

36. Reinstall probes, drain valves, high-limit thermostats and other pipefittings using Loctite

PST56765 sealant or equivalent on their threads.

7-16

®

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.7 Troubleshooting and Problem Isolation

Because it is not feasible to attempt to include in this manual every conceivable problem or trouble
condition that might be encountered, this section is intended to provide technicians with a general
knowledge of the broad problem categories associated with this equipment, and the probable causes
of each. With this knowledge, the technician should be able to isolate and correct any problem en­countered.

Problems you are likely to encounter can be grouped into seven broad categories:

1. Ignition failures

2. Improper burner functioning

3. Improper temperature control

4. Computer-related problems

5. Filtration problems

6. Leakage problems

7. Basket Lift malfunctions.

The probable causes of each category are discussed in the following sections. A series of Trouble­shooting Guides (decision trees) is also included at the end of the chapter to assist in identifying
some of the more common problems.

7.7.1 Ignition Failures

Ignition failure occurs when the ignition module fails to sense a flame within the 4-second time delay
period and locks out. When this happens, the module sends 24 VAC through the interface board
alarm circuit to the controller/computer.

Analog controllers indicate ignition failure by illuminating the heat light and trouble light simultane­ously. Digital, Computer Magic III, and Basket Lift Timer controls display “

H E L p.”

The three primary reasons for ignition failure, listed in order of probability, are:

1. Problems related to the gas and/or electrical power supplies

2. Problems related to the electronic circuits

3. Problems related to the gas valve.

PROBLEMS RELATED TO THE GAS AND/OR ELECTRICAL POWER SUPPLIES

The main indicators of this are that an entire battery of fryers fails to light and/or there are no indi­cator lights illuminated on the fryer experiencing ignition failure. Verify that the quick disconnect
fitting is properly connected, the fryer is plugged in, the main gas supply valve is open, and the cir­cuit breaker for the fryer electrical supply is not tripped.

7-17

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

PROBLEMS RELATED TO THE ELECTRONIC CIRCUITS

If gas and electrical power are being supplied to the fryer, the next most likely cause of ignition fail­ure is a problem in the 24 VAC circuit. If the fryer is equipped with a built-in filtration system, first
verify that the drain valve is fully closed. (The valve is attached to a microswitch that must be closed
for power to reach the gas valve. Often, although the valve handle appears to be in the closed posi­tion, the microswitch is still open.) If the valve is fully closed, or the fryer does not have a built-in
filtration system, refer to the troubleshooting guides TROUBLESHOOTING THE 24 VAC CIRCUIT.

Some typical causes of ignition failure in this category include a defective sensing wire in the ignitor
assembly, a defective module, a defective ignition wire, and a defective ignitor.

Occasionally you may encounter an ignition failure situation in which all components appear to be
serviceable and the microamp reading is within specification, but the unit nevertheless goes into ig­nition failure during operation. The probable cause in this case is an intermittent failure of an igni­tion module. When the unit is opened up for troubleshooting, the module cools down enough to op­erate correctly, but when the unit is again closed up and placed back into service the module heats up
and fails.

PROBLEMS RELATED TO THE GAS VALVE

If the problem is not in the 24 VAC circuit, it is most likely in the gas valve itself, but before replac­ing the gas valve refer to TROUBLE SHOOTING THE GAS VALVE.

7.7.2 Improper Burner Functioning

With problems in this category, the burner ignites but exhibits abnormal characteristics such as
“popping,” dark spots on the burner ceramics, fluctuating flame intensity, and flames shooting out of
the flue.

“Popping” indicates delayed ignition. In this condition, the main gas valve is opening but the burner

is not immediately lighting. When ignition does take place, the excess gas “explodes” into flame,
rather than smoothly igniting.

The primary causes of popping are:

• Incorrect or fluctuating gas pressure

• A defective or incorrectly adjusted combustion air blower

• Inadequate make-up air

• Heat damage to the controller or ignition module

• A cracked ignitor or broken ignition wire

• A defective ignition module

7-18

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

• Cracked burner tile (this typically causes a very loud pop)

If popping occurs only during peak operating hours, the problem may be incorrect or fluctuating gas
pressure. Verify that the incoming gas pressure (pressure to the gas valve) is in accordance with the
appropriate CE or Non-CE Standard found in Section 2.3 of this manual, and that the pressure re-

mains constant throughout all hours of usage. Refer to Check Burner Manif old Pressure in the

Semi-Annual Checks and Services section of Chapter 5 for the procedure for checking the pressure
of gas supplied to the burner.

If popping is consistent during all hours of operation, the most likely cause is an insufficient air sup­ply. Check for “negative pressure” conditions in the kitchen area. If air is flowing into the kitchen
area, this indicates that more air is being exhausted than is being replenished and the burners may be
starved for air.

If the fryer’s gas and air supplies are okay, the problem is most likely with one of the electrical com­ponents. Examine the ignition module and controller for signs of melting/distortion and/or discol­oration due to excessive heat build-up in the fryer. (This condition usually indicates improper flue
performance.) A melted or distorted ignition module is automatically suspect and should be replaced,
but unless the condition causing excessive heat is corrected, the problem is likely to recur.

Verify that the ignition wire is tightly connected at both ends and free of obvious signs of damage.
Again, if damage is due to excessive heat in the fryer, that problem must also be corrected.

Check for proper operation by disconnecting the wire from the ignitor (spark plug), inserting the tip
of a screw driver into the terminal, and holding it near the frame of the fryer as the power switch is
placed in the ON position. A strong, blue spark should be generated for at least 4 seconds.

DANGER

MAKE SURE YOU ARE HOLDING THE INSULATED HANDLE OF THE SCREWDRIVER

AND NOT THE BLADE. THE SPARKING CHARGE IS APPROXIMATELY 25,000

VOLTS.

Examine the ignitor (spark plug) for any signs of cracking. A cracked ignitor must be replaced.
If all other causes have been ruled out, examine the burner tiles for any signs of cracking. If found,
the burner must be replaced.

Fluctuating flame intensity is normally caused by either improper or fluctuating incoming gas pres-

sure, but may also be the result of variations in the kitchen atmosphere. Verify incoming gas pres­sure in the same way as for “popping,” discussed in the preceding paragraphs. Variations in the
kitchen atmosphere are usually caused by air conditioning and/or ventilation units starting and stop­ping during the day. As they start and stop, the pressure in the kitchen may change from positive or
neutral to negative, or vice versa. They may also cause changes in airflow patterns that may affect
flame intensity.

7-19

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

Dark spots on the burner tiles are the result of an improper air/gas mixture. Adjust the combustion

air blower to reduce the amount of air in the mixture to correct this problem

Flames shooting out of the flue are usually an indication of negative pressure in the kitchen. Air is

being sucked out of the burner enclosure and the flames are literally following the air. If negative
pressure is not the cause, check for high burner manifold gas pressure in accordance with the proce­dures in Chapter 5.

An excessi vely noisy burner, especially with flames visible above the flue opening, may indicate

that the gas pressure is too high, or it may simply be that the gas valve vent tube is blocked. If the
incoming gas pressure is correct and the vent tube is unobstructed, the gas valve regulator is probably
defective.

Occasionally a burner may apparently be operating correctly, but nevertheless the fryer has a slow
recovery rate (the length of time required for the fryer to increase the oil temperature from 275ºF to

325ºF (135ºC to 163ºC)). The primary causes of this are an over-filled vat, a dirty or out-of­adjustment combustion air blower, low burner manifold pressure, and/or damaged burner tiles.
Adding oil to the frypot during the recovery process will also cause a slow recovery rate. If these

causes are ruled out, the probable cause is a misadjusted gas valve regulator. Refer to the Check
Burner Manifold Pressure procedure in the Semi-Annual Checks and Service section of Chapter 5.

7.7.3 Improper Temperature Control

Temperature control, including the melt cycle, is a function of several interrelated components, each
of which must operate correctly. The principle component is the temperature probe. Other compo­nents include the interface board, the controller itself, and the ignition module.

Improper temperature control problems can be categorized into melt cycle problems and failure to
control at setpoint problems.

MELT CYCLE PROBLEMS

In fryers equipped with Analog controls, the melt cycle must be initiated by pressing the melt cycle
switch. With all other controllers, initiation of the melt cycle is automatic.

Problems may be with the controller itself, the temperature probe, or a malfunctioning heat relay on
the interface board.

FAILURE TO CONTROL AT SETPOINT

Problems in this category may be with the temperature probe, the interface board, or the controller.

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H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.7.4 Computer-Related Problems

COMPUTER MAGIC III FEATURES

SENSITIVITY OR “STRETCH AND SHRINK TIME”

Sensitivity or stretch time is a programmable feature, patented by Frymaster, that increases or de-

creases the cook time countdown based on variations in the oil temperature from the set point.

The sensitivity for each product button has ten settings (0 through 9). A zero sensitivity setting will
disable the feature (no change in cooking time), while a nine will provide the highest sensitivity or
most change. The correct sensitivity for any product is based on the product, its density, the set point
temperature, and the customer’s own requirements.

RECOVERY TIME OR “RAT E OF RISE”

Recovery time or rate of rise is a method of measuring a fryer’s performance. Put simply, it is the

time required for the fryer to increase the oil temperature from 275ºF to 325ºF (135ºC to 163ºC).
This range is used as a standard since ambient kitchen temperatures can effect the test if lower ranges
are used.

The Computer Magic III performs the recovery test each time the fryer warms up. An operator can
view the results of the test any time the fryer is above the 325ºF (163ºC) point by pressing the

button and entering the code 1652. The test results will be displayed in the computer’s LED panel in
minutes and seconds. The maximum acceptable recovery time for the H50 Series of fryers is two
minutes and twenty-five seconds.

COMPUTER MAGIC III STRAPPING

The Computer Magic III controller does not automatically recognize a full vat or dual vat fryer. Each
computer is set up at the factory for full or dual vat, gas or electric, and controlling or non­controlling applications. This is accomplished through a procedure known as strapping or unstrap­ping the computer.

Occasionally you may encounter a situation in which a computer that has been strapped for one type
of fryer has been installed in another type. An examination of the computer strapping may explain
the incorrect functioning of an otherwise good computer.

The computer’s straps are numbered S1 through S3, from left to right.

S1 should be open for non-controlling applications and closed for controlling.
S2 should be open for electric fryers and closed for gas fryers.
S3 should be open for full vat and closed for dual vat configurations.

WARNING

Do not attempt to alter the strapping of the computer. Doing so may render the

computer inoperable and will void the component warranty.

7-21

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

COMMON COMPUTER COMPLAINTS

Most problems concerning computers have to do with programming them. There are four common
complaints. The complaints, their causes, and corrective actions are:

1. Fryer constantly displays “HI.”

Cause: Setpoint incorrect or missing.

Corrective Action: Press 1650, enter the correct setpoint using keypad, then press to lock
in the setpoint.

2. Temperature is displayed in Celsius.

Cause: Computer is programmed to display in Celsius.

Corrective Action: Press 1658.

3. Temperature is constantly displayed.

Cause: Computer is programmed for constant temperature display.

Corrective Action: Press 165L.

4. Computer times down too slowly or too quickly.

Cause: Computer is compensating for oil temperature via the sensitivity setting.

Corrective Action: Reprogram sensitivity setting for each product in accordance with program­ming instructions in Chapter 3.

7.7.5 Filtration Problems

The majority of filtration problems arise from operator error. One of the most common errors is
placing the filter paper on the bottom of the filter pan rather than over the filter screen.

Whenever the complaint is “the pump is running, but no oil is being filtered,” check the installation
of the filter paper, including that the correct size is being used. While you are checking the filter pa­per, verify that the O-ring on the bottom of the filter pan is present and in good condition. A missing
or worn O-ring will allow the pump to suck air and decrease its efficiency.

If the pump motor overheats, its thermal overload will trip and the motor will not start until it is re­set. If the pump motor does not start, press the red reset switch located on the rear of the motor. If
the pump then starts, something caused the motor to overheat. It may just be that several frypots
were being filtered one after the other and the pump got hot. Letting the pump cool down for at least
a half-hour is all that is required in this case. More often, the pump overheated for one of the fol­lowing reasons:

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H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

• Shortening was solidified in the pan or filter lines.

• The operator attempted to filter oil or shortening that was not heated. Cold oil and shortening are

thicker and cause the pump motor to work harder and overheat.

If the motor hums but the pump does not rotate, there is a blockage in the pump. Incorrectly sized or
installed paper will allow food particles and sediment to pass through the filter pan and into the
pump. When sediment enters the pump, the gears can bind up causing the motor to overload, again
tripping the thermal overload. Solidified shortening in the pump will also cause it to seize, with the
same result.

A pump seized by debris or hard shortening can usually be freed by manually moving the gears with

a screwdriver or other instrument as illustrated below. Make sure power to the pump motor is off

before trying this.

1. Disconnect power to the filter system.

2. Remove the input plumbing from the pump.

3. Use a screwdriver to manually turn the gears.

• Turning the pump gears backwards will release a hard particle and allow its removal.

• Turning the pump gears forward will push softer objects and solid shortening through the

pump and allow free movement of the gears.

FREEING A SEIZED PUMP

Sediment Particle

Up for reverse

FLOW

Down for forward

Incorrectly sized or installed paper will also allow food particles and sediment to pass through and
clog the suction tube on the bottom of the filter carriage. Particles large enough to block the suction
tube may indicate that the crumb tray is not being used.

Pan blockage can also occur if shortening is left in the pan and allowed to solidify. The heater strip
on the suction tube is designed to prevent solidification of residual shortening left in the tube. It will
not melt or prevent solidification of shortening in the pan.

7-23

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

Blockage removal can be accomplished by forcing the item out with an auger or drain snake. Com­pressed air or other pressurized gases should not be used to force out the blockage.

Possible problems with the Power Shower include clogged openings, shortening solidified in the
tubes, missing clean-out plugs, and missing or worn O-rings. Cleaning the unit and replacing miss­ing plugs and missing or worn O-rings will correct these problems.

The electronics of the Filter Magic and FootPrint III systems are simple and straightforward. Mi­croswitches, attached to handles for each vat and wired in parallel, provide the 24 VAC required to
activate the pump relay coil when the handles are moved to the ON position. The activated pump
relay coil pulls in the pump motor switch, supplying power to the pump motor.

Line VAC

Return Line Heater Tapes

24 VAC

Suction Tube (Pan) Heater Tape

Micro-switches

Pump Relay Coil

Pump Motor

M

Pump Motor Switch

Filter Magic Simplified Wiring Diagram

Line VAC

All Heater Tap es (Original and Redesigned Models)

(Heater Tapes have been removed f rom

return lines in Redesigned Models)

24 VAC

Solenoids

(Redesigned Models On ly)

Micro-switches

Pump Relay Coil

Pump Motor

M

Pump Motor Switch

FootPrint III Simplified Wiring Diagram

The oil return line heater tapes in the Filter Magic system are wired directly into the line VAC source
and remain energized as long as the unit is plugged in. The filter pan suction tube heater tape, how­ever, is wired into the 24 VAC circuit. The suction tube tape is activated only when the filter pan is
positioned all the way to the rear of the cabinet, allowing a pair of “bullet” contactors mounted on
the pan to touch a corresponding pair of contactors mounted on the cabinet frame.

For FootPrint III systems built before August 1997, all heater tapes are wired directly into the line
VAC source. They remain energized as long as the unit is plugged in. In systems built in August
1997 and later, oil return line heater tapes have been eliminated. In these units, the only heater tape
used is on the suction tube and pump. This tape is still wired directly into the line voltage. A pair of
vacuum-breaking solenoids is wired into the 24 VAC circuit.

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H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

The redesigned FPIII is distinguished from original-design units by the absence of casters on the
filter base assembly. The redesign incorporated an improved oil return system that allows

oil/shortening to drain back to the filter pan when the filter system is turned off, eliminating the need
for most heated oil return components. For a short time, one-piece, welded oil return manifolds were
used. The one-piece manifolds have been replaced with Dormont stainless steel flexlines and
nipples.

Operation of the redesigned FP-III system is the same as for the original design.

ORIGINAL VS REDESIGNED FP-III FILTRATION SYSTEM

Original System Redesigned System

Return lines and manifolds wrapped with silicone
strip heaters and aluminum tape.
Filter base assembly connected to unit with a
black, heated return hose beneath the filter.

Filter base assembly equipped with swivel cast­ers.
Operator-removable filter base assembly. (Filter
base assembly stoplocks in cabinet can be ro­tated to remove tray.)

Oil/shortening remains in return lines when filter
system is turned off.

No heater strips or aluminum tape on return lines.
Non-heated Teflon hose with a swivel joint con-

nects the filter base assem bly to the unit above
the filter.
Filter base assembly has no casters.

Filter base assembly is not rem ovable except by
a qualified service technician. (Filter base as­sembly stoplocks fitted with a screw and nut to
prevent filter removal.)
Oil/shortening gravity-drains back to the filter pan
when filter system is turned off, leaving no oil or
shortening in return lines.

Square Drain Sub-System

The only change to the square drain sub-system is the addition of a ¼” NPT vent coupling to the
leftmost end sections to allow attachment to a vacuum-breaking solenoid. The new end sections may
also be used on the original-design filtration system by plugging the vent port with a ¼” NPT pipe
plug coated with sealant. All other square drain components remain unchanged.

Power Shower Sub-System

A one-piece, welded rear manifold and Dormont stainless steel flexlines replace the various pieces of
½” NPT piping, flexlines, and heater-strips used on the original-design filtration system. A solenoid
vent valve is mounted on the left end of the front oil return assembly. It prevents vacuum-lock of the
system as oil/shortening drains back to the filter pan when the unit is turned off. The solenoid valve
is connected to the square drain sub-system by a clear ⅜” O.D. Teflon tube and threaded fittings.
The Gemini ball valve used on the manifold is the same as that used on the earlier design. Eight and
one-half-inch stainless steel Dormont flexlines replace the flexlines that connect the manifolds to the
valves. Standard ½” X ½” X 90º black metal street elbows are used to make the connections.

A one-piece manifold is attached to the rear of the leftmost two frypots. This manifold replaces the
oil return hose bracket found at the left front of the fryer in original-design units. A 22-inch Dor­mont stainless steel flexline, running above the filter assembly, connects the front oil return assembly

7-25

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

to the new rear manifold. This replaces the previous stainless steel tubing that ran from the front oil
return assembly to the hose bracket at the left front of the cabinet.

Filter Base Assembly and Pump Sub-System

Casters are not present on the new-design filter base. In addition, the filter base assembly has been
redesigned to prevent it being taken out of the cabinet without removing a set of machine screws and
nuts. The filter pan is unchanged and is completely removable.

A new Teflon hose with a braided stainless steel covering connects the pump to the rear manifold
and replaces the heated hose running from the pump discharge under the unit to the Power Shower
plumbing. The new hose is fitted with a 90º swivel at the manifold end and a straight swivel at the
pump end to prevent kinking.

The pump plumbing has been changed by the addition of a solenoid valve at the pump discharge, a
¼” I.D. Dormont stainless steel flexline that connects the solenoid valve to the pump inlet fittings,
and miscellaneous standard black metal fittings for connections. This design allows oil/shortening to
bypass the pump as it drains from the oil return lines back into the filter pan when the system is
turned off. Bypassing the pump expedites draining of the lines. The pump solenoid leads are con­nected to Pins 7 and 9 of the upper 9-pin plug assembly.

Filter Wiring Box

The original-design 5-lead cable connecting the filter assembly to the filter wiring box has been re­placed with a new, universal 7-lead cable to accommodate the solenoid mounted on the front mani­fold. The two new leads have a separate connector for attachment to the solenoid. When a filter ca­ble is ordered for either filtration system configuration (original or redesigned), the new 7-wire cable
will be sent. The two extra wires and connector will not interfere with the original filtration system
or its operation.

Fryer Heat Shield

The front heat shield between the leftmost two frypots has been modified by the addition of a hole at
the lower end to allow routing of the Dormont stainless steel flexline that connects the front mani­fold to the rear manifold.

Verifying Solenoid Operation

Proper operation of the 24 VAC manifold and pump solenoids can be verified by removing the pump
motor lead from terminal 4 of the pump motor relay in the filter wiring box and then activating the
oil return lever. Proper solenoid operation will be evidenced by an audible “click” or vibration of
both the pump solenoid and the manifold solenoid.

7-26

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.7.6 Leakage Problems

Leakage of the frypot will usually be due to improperly sealed high limit thermostats, temperature
probes, and drain fittings. When installed or replaced, each of these components must be sealed with
Loctite® PST56765 sealant or equivalent to prevent leakage. In very rare cases, a leak may develop
along one of the welded edges of the frypot. When this occurs, the frypot must be replaced.

If the sides and/or ends of the frypot are coated with oil/shortening, the most likely cause is spillage
over the top of the frypot rather than leakage.

The clamps, which hold the drain tube sections together, may loosen over time as the tubes expand
and contract with heating and cooling during use. If the section of drain tube connected to the drain
valve is removed for whatever reason, make sure that its grommet is in good condition and properly
fitted around the nipple of the drain when it is reinstalled. Also, check to insure that the drain tube
runs downward from the drain along its whole length and has no low points where oil or shortening
may accumulate.

7.7.7 Basket Lift Malfunctions

H50 Series fryers may optionally be equipped with automatic basket lifts to ensure uniform cooking
times. Basket lifts will always come in pairs, although each operates independently of the other.

Depending upon the specific model, date of manufacture, and customer specifications, an H50 fryer
may be equipped with a bell crank style basket lift, or a “modular” basket lift.

A modular basket lift (illustrated on the following page) consists of a toothed rod to which the bas-

ket lift arm is attached, a reversible-drive gear motor, and a pair of roller-activated microswitches.
The gear motor engages the teeth in the rod, moving it up or down depending upon the direction of
rotation of the motor. Microswitches at the upper and lower limits of movement stop the motor
when the basket is in the full up or full down position.

Timing circuitry in the controller initiates and stops basket lift operation depending upon the
variables programmed by the operator. When the product button is pressed, the timing circuitry
activates a coil in the basket lift relay to supply power to the lower microswitch. The microswitches
stop the motor at the lift’s upper and lower travel limits and reverse the direction of current flow thus
reversing the motor direction.

7-27

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

100/120V Modular Basket Lift Assembly w/o Relay

P/N 806-8531S P (TYPICAL)

7-28

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

100/120V Modular Basket Lift Simplified Wiring Diagram

12.5µF

UPPER

SWITCH

BRN 1

98C

NC

NO

COM

LEFT SIDE

93C

M M

BLK BLK

92C

RED 1

RESISTOR

RIGHT SIDE

101C

13W

96C

BRN 2

95C

RED 2

97C

NO

NC

COM

UPPER

SWITCH

12.5 µ F

NO

NC

NC

NO

LOWER

SWITCH

COM

32C

6

4C

5

61C29C

4

3

10C

2 1

3C

COM

LOWER

SWITCH

NOTE: References to RIGHT and LEFT are from rear of fryer.

7-29

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

A bell crank style basket lift consists of a cam and bell

crank that are connected to the basket lift arm by a flat metal
link. The cam is attached to a drive motor. The motor ro­tates the cam, thus raising or lowering the lift arm linked to
the bell crank. A roller-activated microswitch is used to limit
travel. When the roller in the microswitch is in contact with
the cam, the motor is energized. As the cam rotates, the mi­croswitch roller eventually loses contact with the cam and the
motor power circuit is broken, de-energizing the motor.

Timing circuitry in the controller initiates and stops basket
lift operation depending upon the variables programmed by
the operator. When the product button is pressed, the timing
circuitry activates a coil in the basket lift relay to supply

Bell crank and cam with basket lift
link shown in down position. Note

microswitch in upper right corner.

power to the motor. The microswitch stops the motor at the
lift’s lower travel limit and the switch contacts are reversed. At the end of the programmed cooking
time, the timing circuit activates the coil once more and the lift rises until the microswitch again
loses contact with the cam, opening the motor power circuit and stopping the motor.

Bell Crank Basket Lift Simplified Wiring Diagram

LEFT

MICROSWITCH

Computer/Controller

NOTE: References to right and left are from rear of fryer.

C10

NC NO

MOTOR

WHITE

123456

35C

C

LEFT

BLACK

33C
32C

29C

34C

BLACK

BLACK

BLUE

30C

31C

NC NO

C

RIGHT

MOTOR

RIGHT

MICROSWITCH

7-30

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

Problems with either basket lift design can be grouped into three categories:

• Binding/jamming problems

• Motor and gear problems

• Electronics problems

BINDING/JAMMING PROBLEMS

Noisy, jerky or erratic movement of the lifts is usually due to lack of lubrication of the rods and their

®

bushings. Apply a light coat of Lubriplate

or similar lightweight white grease to the rod and bush-

ings to correct the problem.

With the modular basket lift, another possible cause of binding is improper positioning of the motor,
which prevents the gear from correctly engaging the teeth in the rod. To correct the problem, loosen
the screws that hold the motor in place and move it forward or backward until the rod has just
enough slack to be rotated slightly.

MOTOR AND GEAR PROBLEMS

With the modular basket lift, the most likely problem to be encountered in this category is erratic
motion of the lift due to a worn drive gear. Failure to keep the lift rod and bushings properly lubri­cated will cause unnecessary wear of the gear. The problem is corrected by replacing the worn gear.

If the lift cycles correctly but fails to remain in the up position (i.e., goes up, but then slowly settles
back down into the frypot), the problem is a failed motor brake. A failed motor brake cannot be re­paired and requires replacement of the motor itself.

If power is reaching the motor but the motor fails to run, the motor is burned out and must be re­placed.

ELECTRONICS PROBLEMS

Within this category are problems associated with the relays, microswitches, capacitors, resistors,
interface board, wiring, and controls. The most common problem in this category is a lift that
continuously travels up and down. This is usually caused by a microswitch that is out of adjustment.

Troubleshooting the electronics of either type basket lift is simply a process of verifying current flow
through the individual components up to and including the motor. Using a multimeter set to the 250
VAC range, check the connections on both sides of the component for the presence of the applied
line voltage. The accompanying simplified wiring diagrams identify the components and wiring
connection points.

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H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.7.8 Interpretation of Digital Controller Lights

Power light on, heat light cycling, trouble light off, and melt light on:

• If fryer oil temperature is below 180ºF (82ºC), the lights indicate the unit is operating nor-

mally.

• If the oil temperature is above 180ºF (82ºC) and the heat light continues to cycle as if in the

melt cycle, this may indicate a defective probe circuit or low incoming 12VAC to the con­troller.

Power light on, heat light on, trouble light off, and melt light off:

• If the fryer oil temperature is above 180ºF (82ºC) and below the setpoint temperature, the

lights indicate the unit is operating properly.

• If the oil temperature is above the temperature set on the control knob and the heat light re-

mains lit, this may indicate a defective probe circuit.

Power light on, heat light off, trouble light on, and melt light off:

• If the fryer oil temperature is below 410ºF (210ºC), the lights indicate one of the following:

a. The probe circuit is defective, or
b. There is a connection problem on pins 2 or 10 on the 15-pin wiring harness.

• If the fryer oil temperature is above 410ºF (210ºC), the lights indicate a run-away heating cir-

cuit.

7.8 Troubleshooting Guides

The troubleshooting guides found in the pages that follow are intended to assist service technicians
in quickly isolating the probable causes of equipment malfunctions by following a logical, step-by­step process. An additional set of operator troubleshooting guides is contained in Chapter 6. It is
suggested that service technicians thoroughly familiarize themselves with both sets.

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H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.8.1 Troubleshooting the 24 VAC Circuit

UNIT IS CONNECTED TO

POWER SUPPLY, DRAIN VALVE

IS FULLY CLOSED, CONTROLLER

IS ON AND IS CALLING FOR HEAT

(decimal appears between first
two digits in controller display).

Is 24VAC present

on interface board J3 pin

9 (LED 5 (GV)) and, on dual vat

units, J1 pin 9 (LED 1

(GV))?

No

Is LED 3 (24V) lit

continuously?

No

Yes

NOTE: All voltage measurements must

be made within 4 seconds of unit

calling for heat. If unit does not fire

within 4 seconds, ignition modules will

lock out and controller must be turned

off then back on to reset.

Yes

Is 24VAC present

across gas valve main coil (PV

terminal) (on both valves if

dual vat)?

No

Probable causes are an open high-limit

or a failed wire between the interface

board and the gas valve. On units with

built-in filtration, cause may also be a

failed drain safety switch.

Check continuity of high-limit

and continuity of drain safety

switch. If both are zero,

problem is in wiring.

Is 24VAC

present on the right PWR

terminal (LED 4) (and left PWR

terminal (LED 2), if

dual vat)?

No

Yes

Yes

24V circuit is OK.

Problem may be with

gas valve.

Probable cause is

failed interface

board.

Yes

Is 24VAC

present on V1S (or

V1D and V2D, if

dual vat)?

No

Probable causes are failed

24V transformer or failed

wiring between transformer

and interface board.

Probable cause is

failed interface

board.

7-33

If fuse(s) in ignition module(s)

is/are good, probable causes are

failed ignition module(s) or failed interface

board. Replace suspect ignition

module with one known to be

good to isolate cause.

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

24V

XFMR

24V

LED

(3)

PWR

(2)

GV

(1)

J1 PIN 8

LED

PWR

V2D

LED

J1 PIN 9

K1

IGNITION
MODULE

HIGH
LIMIT

SWITCH

K2

IGNITION
MODULE

HIGH

LIMIT

SWITCH

J3 PIN 8

PWR

LED

PWR

V1S OR V1D

GV

LED

(5)

J3 PIN 9

(4)

DRAIN

SAFETY

SWITCH

GAS

VALVE

LEFT VAT

This switch used only with
built-in filtration systems.

FULL OR RIGHT VAT

24 VOLT CIRCUIT

(IFB 806-3398)

7-34

DRAIN

SAFETY

SWITCH

GAS

VALVE

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.8.2 Troubleshooting the Gas Valve

CONTROLLER

IS CALLING FOR

HEAT.

For non-CE units, verify

gas valve is in ON

position.

Is 24 VAC

present across gas

valve main coil?

Yes

Is

incoming gas pressure

in accordance with tables in

Section 2.3 of this

manual?

Yes

Is outgoing

gas pressure in

accordance with tables on

Page 5-9 of this

manual?

Yes

No

Problem is with 24

VAC Circuit. Refer to 24

VAC Troubleshooting

Guide.

No

Problem is

with gas supply

to fryer.

Probable cause is misadjusted

or failed gas valve. Adjust gas valve in

No

accordance with procedure "Check Burner

Manifold Pressure" in Chapter 5 of this

manual. If valve cannot be

adjusted, replace valve.

Gas valve is OK.

7-35

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.8.3 Troubleshooting the Temperature Probe

While it is still in frypot,

inspect probe body for

damage. Remove and

replace if bent, dented or

Inspect leads for fraying,

Determine temperature of

cooking oil/shortening using

a thermometer or pyrometer

cracked.

burning, breaks, and/or

kinks. If found, replace

probe.

placed at tip of probe.

Problem is not with

probe.

Is resistance through

J3 pins 2 and 6 (J1 pins 2 and 6 for

left side of dual vat) approximately equal to

that given in Probe Resistance Chart for

corresponding temperature?

Yes

Measure resistance

through each of the

previously tested pins to

Yes No

ground.

Is resistance 5

mega-Ohms or greater

in each pin?

No

Probe has failed.

7-36

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

Probe Resistance Chart

For use with H50 Series fryers manufactured with Minco Thermistor probes only.

FOHMSC FOHMSC FOHMSC FOHMSC FOHMSC

32 1000 0 83 1107 28 134 1214 57 185 1320 85 236 1424 113
33 1002 1 84 1110 29 135 1216 57 186 1322 86 237 1426 114
34 1004 1 85 1112 29 136 1218 58 187 1324 86 238 1428 114
35 1006 2 86 1114 30 137 1220 58 188 1326 87 239 1430 115
36 1008 2 87 1116 31 138 1222 59 189 1328 87 240 1432 116
37 1011 3 88 1118 31 139 1224 59 190 1330 88 241 1434 116
38 1013 3 89 1120 32 140 1226 60 191 1332 88 242 1436 117
39 1015 4 90 1122 32 141 1229 61 192 1334 89 243 1438 117
40 1017 4 91 1124 33 142 1231 61 193 1336 89 244 1440 118
41 1019 5 92 1126 33 143 1233 62 194 1338 90 245 1442 118
42 1021 6 93 1128 34 144 1235 62 195 1340 91 246 1444 119
43 1023 6 94 1131 34 145 1237 63 196 1342 91 247 1447 119
44 1025 7 95 1133 35 146 1239 63 197 1344 92 248 1449 120
45 1027 7 96 1135 36 147 1241 64 198 1346 92 249 1451 121
46 1030 8 97 1137 36 148 1243 64 199 1348 93 250 1453 121
47 1032 8 98 1139 37 149 1245 65 200 1350 93 251 1455 122
48 1034 9 99 1141 37 150 1247 66 201 1352 94 252 1457 122
49 1036 9 100 1143 38 151 1249 66 202 1354 94 253 1459 123
50 1038 10 101 1145 38 152 1251 67 203 1357 95 254 1461 123
51 1040 11 102 1147 39 153 1253 67 204 1359 96 255 1463 124
52 1042 11 103 1149 39 154 1255 68 205 1361 96 256 1465 124
53 1044 12 104 1151 40 155 1258 68 206 1363 97 257 1467 125
54 1046 12 105 1154 41 156 1260 69 207 1365 97 258 1469 126
55 1049 13 106 1156 41 157 1262 69 208 1367 98 259 1471 126
56 1051 13 107 1158 42 158 1264 70 209 1369 98 260 1473 127
57 1053 14 108 1160 42 159 1266 71 210 1371 99 261 1475 127
58 1055 14 109 1162 43 160 1268 71 211 1373 99 262 1477 128
59 1057 15 110 1164 43 161 1270 72 212 1375 100 263 1479 128
60 1059 16 111 1166 44 162 1272 72 213 1377 101 264 1481 129
61 1061 16 112 1168 44 163 1274 73 214 1379 101 265 1483 129
62 1063 17 113 1170 45 164 1276 73 215 1381 102 266 1485 130
63 1065 17 114 1172 46 165 1278 74 216 1383 102 267 1487 131
64 1068 18 115 1174 46 166 1280 74 217 1385 103 268 1489 131
65 1070 18 116 1176 47 167 1282 75 218 1387 103 269 1491 132
66 1072 19 117 1179 47 168 1284 76 219 1389 104 270 1493 132
67 1074 19 118 1181 48 169 1287 76 220 1391 104 271 1495 133
68 1076 20 119 1183 48 170 1289 77 221 1393 105 272 1497 133
69 1078 21 120 1185 49 171 1291 77 222 1395 106 273 1499 134
70 1080 21 121 1187 49 172 1293 78 223 1398 106 274 1501 134
71 1082 22 122 1189 50 173 1295 78 224 1400 107 275 1503 135
72 1084 22 123 1191 51 174 1297 79 225 1402 107 276 1505 136
73 1086 23 124 1193 51 175 1299 79 226 1404 108 277 1507 136
74 1089 23 125 1195 52 176 1301 80 227 1406 108 278 1509 137
75 1091 24 126 1197 52 177 1303 81 228 1408 109 279 1512 137
76 1093 24 127 1199 53 178 1305 81 229 1410 109 280 1514 138
77 1095 25 128 1201 53 179 1307 82 230 1412 110 281 1516 138
78 1097 26 129 1722 54 180 1309 82 231 1414 111 282 1518 139
79 1099 26 130 1204 54 181 1311 83 232 1416 111 283 1520 139
80 1101 27 131 1206 55 182 1313 83 233 1418 112 284 1522 140
81 1103 27 132 1208 56 183 1315 84 234 1420 112 285 1524 141
82 1105 28 133 1210 56 184 1317 84 235 1422 113 286 1526 141

7-37

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

Probe Resistance Chart (Continued)

For use with H50 Series fryers manufactured with Minco Thermistor probes only.

FOHMSC FOHMSC FOHMSC FOHMSC FOHMSC

287 1528 142 338 1630 170 389 1732 198 440 1833 227 491 1932 255
288 1530 142 339 1632 171 390 1734 199 441 1835 227 492 1934 256
289 1532 143 340 1634 171 391 1736 199 442 1837 228 493 1936 256
290 1534 143 341 1636 172 392 1738 200 443 1839 228 494 1938 257
291 1536 144 342 1638 172 393 1740 201 444 1841 229 495 1940 257
292 1538 144 343 1640 173 394 1742 201 445 1843 229 496 1942 258
293 1540 145 344 1642 173 395 1744 202 446 1845 230 497 1944 258
294 1542 146 345 1644 174 396 1746 202 447 1846 231 498 1946 259
295 1544 146 346 1646 174 397 1748 203 448 1848 231 499 1948 259
296 1546 147 347 1648 175 398 1750 203 449 1850 232 500 1950 260
297 1548 147 348 1650 176 399 1752 204 450 1852 232 501 1952 261
298 1550 148 349 1652 176 400 1754 204 451 1854 233 502 1954 261
299 1552 148 350 1654 177 401 1756 205 452 1856 233 503 1956 262
300 1554 149 351 1656 177 402 1758 206 453 1858 234 504 1958 262
301 1556 149 352 1658 178 403 1760 206 454 1860 234 505 1960 263
302 1558 150 353 1660 178 404 1762 207 455 1862 235 506 1962 263
303 1560 151 354 1662 179 405 1764 207 456 1864 236 507 1964 264
304 1562 151 355 1664 179 406 1766 208 457 1866 236 508 1965 264
305 1564 152 356 1666 180 407 1768 208 458 1868 237 509 1967 265
306 1566 152 357 1668 181 408 1770 209 459 1870 237 510 1969 266
307 1568 153 358 1670 181 409 1772 209 460 1872 238 511 1971 266
308 1570 153 359 1672 182 410 1774 210 461 1874 238 512 1973 267
309 1572 154 360 1674 182 411 1776 211 462 1876 239 513 1975 267
310 1574 154 361 1676 183 412 1778 211 463 1878 239 514 1977 268
311 1576 155 362 1678 183 413 1780 212 464 1880 240 515 1979 268
312 1578 156 363 1680 184 414 1781 212 465 1882 241 516 1981 269
313 1580 156 364 1682 184 415 1783 213 466 1884 241 517 1983 269
314 1582 157 365 1684 185 416 1785 213 467 1886 242 518 1985 270
315 1584 157 366 1686 186 417 1787 214 468 1888 242 519 1987 271
316 1586 158 367 1688 186 418 1789 214 469 1890 243 520 1989 271
317 1588 158 368 1690 187 419 1791 215 470 1892 243 521 1991 272
318 1590 159 369 1692 187 420 1793 216 471 1893 244 522 1993 272
319 1592 159 370 1694 188 421 1795 216 472 1895 244 523 1995 273
320 1594 160 371 1696 188 422 1797 217 473 1897 245 524 1996 273
321 1596 161 372 1698 189 423 1799 217 474 1899 246 525 1998 274
322 1598 161 373 1700 189 424 1801 218 475 1901 246 526 2000 274
323 1600 162 374 1702 190 425 1803 218 476 1903 247 527 2002 275
324 1602 162 375 1704 191 426 1805 219 477 1905 247 528 2004 276
325 1604 163 376 1706 191 427 1807 219 478 1907 248 529 2006 276
326 1606 163 377 1708 192 428 1809 220 479 1909 248 530 2008 277
327 1608 164 378 1710 192 429 1811 221 480 1911 249 531 2010 277
328 1610 164 379 1712 193 430 1813 221 481 1913 249 532 2012 278
329 1612 165 380 1714 193 431 1815 222 482 1915 250 533 2014 278
330 1614 166 381 1716 194 432 1817 222 483 1917 251 534 2016 279
331 1616 166 382 1718 194 433 1819 223 484 1919 251 535 2018 279
332 1618 167 383 1720 195 434 1821 223 485 1921 252 536 2020 280
333 1620 167 384 1722 196 435 1823 224 486 1923 252 537 2022 281
334 1622 168 385 1724 196 436 1825 224 487 1925 253 538 2025 281
335 1624 168 386 1726 197 437 1827 225 488 1927 253 539 2027 282
336 1626 169 387 1728 197 438 1829 226 489 1929 254 540 2029 282
337 1628 169 388 1730 198 439 1831 226 490 1931 254 541 2031 283

7-38

7-39

DRAIN SAFETY SWITCH

ONLY ON UNITS WITH

BUIL T-IN FILTR ATION

AIR SWITCH

ONLY ON CE AND SOME

EXPORT UNITS

LEFT IGNITION

MODULE

ALARM

25V

25V

GND

TD

VALVE

BNR

HV

GND

PWR

L HEAT

LED 2

LINE

VOLTAGE

12V

12V

LED 6

OPTIONAL

AIR SWITCH

24V

24V

LED 3 LED 5

K4

FAN

RELAY

K2

HEAT

RELAY

AIR

DRAIN
SAFETY

SWITCH

R-GV

GV

HI

LIMIT

BLOWER

TEMP

PROBE

R-HEAT

LED 4

7.9 Simplified Wiring Diagrams

H50 SERIES

FULL VA T

JUNE 1996

J3621291185431

AND LATER

CHAPTER 7: SERVICE PROCEDURES

H50 SERIES GAS FRYERS

RIGHT IGNI TION

MODULE

ALARM

PWR

V1S

25V

VALVE

25V

GND

BNR

GND

TD

HV

LEFT IGNIT O R

ALARM

V2S

ALARM

47K

1K

A

33112

2

POWER

ON/OFF

10105

5

TROUBLE

1/50

4

13

14

4

13

14

HEAT

T

M

J211

11

SD

RIGHT IGNITOR

DRAIN SAFETY SWITCH

ONLY ON UNITS WITH

BUILT-IN FILTRATION

AIR SWITCH

ONLY ON CE AND SOME

EXPORT UNITS

TEMP

PROBE

LINE

VOLTAGE

DRAIN SAFETY

SWITCH

GV

HIGH
LIMIT

DRAIN SAFETY

SWITCH

HIGH
LIMIT

4

931598462J1

H50 SERIES

OPTIONAL

GV

AIR

SWITCH

24V12V

8

24V

BLOWER

TEMP

PROBE

9

62J3121148

DUAL VAT

JUNE 1996

AND LATER

CHAPTER 7: SERVICE PROCEDURES

7-40

LEFT IGNITION

MODULE

TD

HV

LEFT
IGNITOR

ALARM

25V

GND

VALVE

BNR
GND

25V+

PWR

V2D

ALARM

L-HEAT

LED 2

151514146612

HEAT

T

M

K1

HEAT

RELAY

A

47K

12

TROUBLE

LED 3

221

1

12V R-GV

LED 6 LED 5

351041314 11J2

351041314 11

AIR

POWER

ON/OFF

L-GV

LED 1

1/50

1K

A A

POWER

ON/OFF

47K

TROUBLE

1/50

1K

K2

HEAT

RELAY

A

K4

FAN

RELAY

HEAT

T

M

R-HEAT

LED 4

PWR

V1D

ALARM

RIGHT I GNITION

MODULE

ALARM

25V+

25V
GND

VALVE

BNR
GND

SD

TD

HV

RIGHT IGNITOR

H50 SERIES GAS FRYERS

H50 SERIES GAS FRYERS

CHAPTER 7: SERVICE PROCEDURES

7.10 Principal Wiring Connections

FROM TRANSFORMER BOX

PROBE

PROBE

C1 PIN 4 (24VAC)

GROUND GROUND

MODULE VALVE 1

J1 PIN 8 VIA K1

OPTIONAL DRAIN SWITCH

GROUND, JUMPERED FROM PIN 2

FROM T1, JUMPERED TO PINS 3 & 9

AIR SWITCH

(CE AND SOME

EXPORT UNITS)

N.C.

N.O.

COM

C1 PIN 3

C1 PIN 1

(IN CONTROL BOX)

T1

T2

C1

LINE VOLTAGE (L1)

LINE VOLTAGE (COM)

NOT USED

LINE VOLTAGE (L1)

LINE VOLTAGE (COM)

GROUND

24VAC
12VAC
12VAC

1
2
3
4
5
6
7
8
9

BLACK
GREEN
WHITE

RED

ORANGE

BLUE

WHITE/BLACK

OPTIONAL

OIL RETURN HEAT E R

TO T2 & J3 PIN 11

TO GROUND

TO T1 & C5 PIN 1
TO J1 PIN 8 & J3 PI N 8
TO J3 PIN 3
TO J3 PIN 1

FROM J3 PIN 5 (12VDC)

LEFT VAT RIGHT OR FULL VAT

FROM TO FROM TO FROM TO

J1

1
2

J2 PIN 14

3
4
5
6

J2 PIN 15

7

K3 C2 PIN 13 (BL DOWN)

8

LEFT PWR VIA K1

9

V2D

K3 C2 PIN 10 (BL UP)

GND
V2D
PWR

V2S

GAS VALVE

10
11
12

J1 PIN 9
MODULE 25V
J2 PIN 12

AD
AS

J3 PIN 1

GROUND

J3 PIN 3
COMPUTER
COMPUTER
COMPUTER
COMPUTER

COMPUTER

ALR (RIGHT)

COMPUTER

AD (LEFT)

J3 PIN 6

J1 PIN 2 & J3 PIN 2

J1 PIN 6

C2

FROM T2, JUMPERED TO PIN 8

GROUND, JUMPERED TO PIN 11

JUMPERED FROM PIN 12

JUMPERED TO PIN 6

JUMPERED TO PIN 7
JUMPERED FROM PIN 4
JUMPERED FROM PIN 5

JUMPERED FROM PIN 1

JUMPERED FROM PIN 12

FROM J1 PIN 10

FROM J1 PIN 7

FROM J3 PIN 10

FROM J3 PIN 7

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

FILTER BOX

TRANSFORMER

A

L

B

R

G

H

W

L

B

A

R

O

BLUE

ORANGE

BLACK

WHITE

B

L

A

G

R

E

W

H

R

E

O

R

A

B

L

J2

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

K

C

N

E

E

E

T

I

E

U

E

G

N

RED
WHITE & BLACK

C

K

E

N

I

T

E

D

N

G

E

U

E

COMPUTER (12VAC)
GROUND
COMPUTER (12VAC)
RT HEAT RELAY (K2)
RELAYS (12VDC) & J3 PIN 5
LT HEAT RELAY (K1)
K5

K3
RIGHT ALARM OUT (FULL VAT)
SOUND DEVICE
LEFT ALARM OUT (DUAL VAT)
COMPUTER
COMPUTER
COMPUTER

MODULE VALVE 1 (DUAL VAT)

OPTIONAL DRAIN SWITCH

MODULE VALVE 1 (FULL VAT)

C3

LINE VOLTAGE L1

1

GROUND

2
3

LINE VOLTAGE COM

4

OIL RETURN SWITCH

5
6
7
8
9

TO OIL RETURN SWITCHES OF ADJACENT FRYERS
TO OIL RETURN SWITCHES OF ADJACENT FRYERS

OIL RETURN HOSE HEATER

C1 PIN 3

J3 PIN 12

C4

LEFT BASKET LIFT

1

GROUND

2

LINE VOLTAGE (COM)

3

LEFT BASKET LIFT

4
5

RIGHT BASKET LIF T
RIGHT BASKET LIF T

6

C1 PIN 6 (12VAC)

PROBE

C1 PIN 5 (12VAC)

J2 PIN 5

PROBE

C1 PIN 4 (24VAC)

OPTIONAL

K5

V1S OR V1D

K5

C1 PIN 1 (L1)

K4 C5 PIN 2

GROUND GROUND

J3 PIN 8 VIA K2

1

OIL RETURN MANIFOLD SOLENOID VALVE

2

C5

1

BLOWER

2

J3

1
2
3
4
5
6
7
8

9
10
11
12

GND
V1D
PWR

ALR
V1S

TO OPTIONAL FILTER BOX

TO OPTIONAL BASKET LIFTS

C2 PIN 12

C2 PIN 1

J2 PIN 1
J2 PIN 14
J2 PIN 3

C1 PIN 7
J2 PIN 13
C2 PIN 15 (BL DOWN)
PWR VIA K2
GAS VALVE
C2 PIN 14 (BL UP)
BLOWER VIA K4

J3 PIN 9
MODULE 25V
J2 PIN 10
J3 PIN 9

7-41