Vulcan GHF90G Service Manual

SERVICE MANUAL

GHF SERIES HEAVY DUTY RANGE MATCHING GAS

FRYERS & FRYMATES

MODELS

GHF91G ML-135503 GHF90G ML-135504

- NOTICE -

This manual is prepared for the use of trained Vulcan Service Technicians and should not be used by those not properly qualified. If you have attended a Vulcan Service School for this product, you may be qualified to perform all the procedures described in this manual.

This manual is not intended to be all encompassing. If you have not attended a Vulcan Service School for this product, you should read, in it's entirety, the repair procedure you wish to perform to determine if you have the necessary tools, instruments and skills required to perform the procedure. Procedures for which you do not have the necessary tools, instruments and skills should be performed by a trained Vulcan Service Technician.

Reproduction or other use of this Manual, without the express written consent of Vulcan, is prohibited.

For additional information on Vulcan-Hart or to locate an authorized parts

and service provider in your area, visit our website at www.vulcanhart.com

VULCAN-HART DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC

WWW.VULCANHART.COM

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P.O. BOX 696, LOUISVILLE, KY 40201-0696

TEL. (502) 778-2791

FORM 35618 (11-04)

TABLE OF CONTENTS

GENERAL .............................................................................................................................................................. 3

Introduction ............................................................................................................................................... 3

Installation ................................................................................................................................................ 3

Oil Filtering ................................................................................................................................................ 3

Operation ................................................................................................................................................... 3

Cleaning .................................................................................................................................................... 3

Lighting Pilot ............................................................................................................................................. 3

Specifications ........................................................................................................................................... 3

Gas Data............................................................................................................................................. 3

Tools ......................................................................................................................................................... 3

Standard ............................................................................................................................................. 3

REMOVAL AND REPLACEMENT OF PARTS ..................................................................................................... 4

Covers and Panels ................................................................................................................................... 4

Door .................................................................................................................................................... 4

Front Panel ......................................................................................................................................... 4

Burners ...................................................................................................................................................... 4

Thermostat ................................................................................................................................................ 5

High Limit .................................................................................................................................................. 6

Thermopile ................................................................................................................................................ 6

Pilot Orifice ............................................................................................................................................... 7

Combination Valve ................................................................................................................................... 7

Fry Tank .................................................................................................................................................... 8

SERVICE PROCEDURES AND ADJUSTMENTS ............................................................................................. 9

Millivolt Controls Test .............................................................................................................................. 9

Thermostat Calibration ............................................................................................................................. 9

Calibration Steps ................................................................................................................................9

Pilot Adjustment ...................................................................................................................................... 10

Burners, Nozzles and Orifices ................................................................................................................10

Burners .............................................................................................................................................. 10

Nozzles and Orifices.........................................................................................................................10

Combination Valve Regulator Adjustment ..............................................................................................11

ELECTRICAL OPERATION ................................................................................................................................12

Control System Description ....................................................................................................................12

System Condition Quick Check Procedures ..........................................................................................12

Schematic ................................................................................................................................................13

Component Function ...............................................................................................................................13

TROUBLESHOOTING .........................................................................................................................................14

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GENERAL

INTRODUCTION

Models

This service manual was written for:

GHF91G Gas Fryers and GHF90G Gas Frymates.

INSTALLATION

Generally, installations are made by the dealer or contracted by the dealer or owner. Detailed installation instructions are included in the Installation and Operation Manual, which is sent with each fryer.

OIL FILTERING

Filtering instructions are included in the Installation and Operation Manual.

NOTE: If pilot does not remain lit, repeat steps 2 through 5, but allow a longer period of time before releasing the combination valve knob. Adjust pilot flame, if necessary, as outlined under Pilot Adjustment in Service Procedures and Adjustments.

6. Turn combination valve knob to ON.

SPECIFICATIONS

Gas Data

MODEL No. Tubes BTU/HR

GHF91G 4 120,000

GHF90G 00

TOOLS

OPERATION

Detailed operation instructions are included with each fryer in the Installation and Operation Manual.

CLEANING

Detailed cleaning procedures are included in the Installation and Operation Manual.

LIGHTING PILOT

1. Turn thermostat OFF.

2. Push combination valve knob in and turn to OFF.

3. Wait 5 minutes for unburned gas to vent.

4. Push combination valve knob in and turn to PILOT.

5. While holding the combination valve knob in, light the pilot with a lit taper. Hold the combination valve knob in for approximately 30 seconds before releasing.

Standard

• Hand tools (standard set)

• VOM with AC current tester (any quality VOM with a sensitivity of at least 20,000 ohms per volt can be used)

• Gas test kit

• Temperature tester (thermocouple type)

• Manometer

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REMOVAL AND REPLACEMENT OF PARTS

COVERS AND PANELS

WARNING: SHUT OFF THE GAS BEFORE

SERVICING.

Door

1. Open door and using a 5/16" wrench or ratchet, remove (2) screws securing the top door mounting bracket to the left body side channel.

BURNERS

WARNING: SHUT OFF THE GAS BEFORE

SERVICING.

1. Open door panel.

2. Loosen (Do not remove) the two mounting bolts at the top of each burner.

2. Hold door in one hand and lift the door panel assembly off of the bottom hinge.

3. Reverse this procedure to reinstall the door panel.

Front Panel

1. Using a flat head screwdriver, remove (2) screws holding the front panel in place.

2. Remove the panel from the unit.

3. Push burner up while pulling the bottom of the burner forward to clear the burner nozzle.

4. Reverse the procedure to install.

3. Remove heat shield.

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THERMOSTAT

WARNING: SHUT OFF THE GAS BEFORE

SERVICING.

1. Drain shortening from fry tank.

2. Remove left burner as outlined under Burners.

3. Remove thermostat knob by pulling knob off thermostat shaft.

4. Remove thermostat mounting screws and remove thermostat from mounting bracket.

6. Loosen the packing nut and holding nut.

7. Remove the thermostat bulb from the clamp.

5. Remove wire leads from the rear of the thermostat, noting all connections for reassembly.

8. Pull the thermostat bulb through the underside of the fry tank and remove the thermostat assembly.

9. Reverse the procedure to install. When installing the new thermostat assembly, do not kink the thermostat capillary. Wrap threads of packing nut with Teflon tape to prevent leakage.

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