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Vulcan-Hart GHF91G - page 1
– 1 – SERVICE MANUAL GHF SERIES HEAVY DUTY RANGE MATCHING GAS FRYERS & FRYMATES MODELS GHF91G M L-135503 GHF90G M L-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 qual ...
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Vulcan-Hart GHF91G - page 2
– 2 – © VULCAN-HART, 2004 TABLE OF CONTENTS GENERAL .............................................................................................................................................................. 3 Introduction ....................................................................................................................... ...
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Vulcan-Hart GHF91G - page 3
– 3 – 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 Filter ...
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Vulcan-Hart GHF91G - page 4
– 4 – 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. 2. Hold door in one hand and lift the door panel assembly off of the bottom hinge. 3. Reverse this procedure to reinstall the d ...
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Vulcan-Hart GHF91G - page 5
– 5 – 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. 5. Remove wire leads from the rear of the thermostat, n ...
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Vulcan-Hart GHF91G - page 6
– 6 – 7. Pull the high limit bulb through the underside of the fry tank and remove the high limit assembly. 8. Reverse the procedure to install. When installing the new high limit assembly, do not kink the high limit capillary. Wrap threads of packing nut with Teflon tape to prevent leakage. THERMOPILE WARNING: SHUT OFF THE GAS BEFORE SERVICING ...
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Vulcan-Hart GHF91G - page 7
– 7 – 6. Remove thermopile from pilot bracket. 7. Reverse procedure to install. PILOT ORIFICE WARNING: SHUT OFF THE GAS BEFORE SERVICING. WARNING: ALL GAS JOINTS DISTURBED DURING SERVICING MUST BE CHECKED FOR LEAKS. CHECK WITH SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME. 1. Remove pilot assembly from fryer as outlined under ther ...
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Vulcan-Hart GHF91G - page 8
– 8 – FRY TANK WARNING: SHUT OFF THE GAS BEFORE SERVICING. WARNING: ALL GAS JOINTS DISTURBED DURING SERVICING MUST BE CHECKED FOR LEAKS. CHECK WITH SOAP AND WATER SOLUTION (BUBBLES). DO NOT USE AN OPEN FLAME. 1. Disconnect fryer from main gas supply. 2. Drain oil from tank. 3. Remove baskets, fryer basket hanger and crumb screen. 4. Remove scre ...
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Vulcan-Hart GHF91G - page 9
– 9 – SERVICE PROCEDURES AND ADJUSTMENTS MILLIVOLT CONTROLS TEST 1. Verify proper gas (natural or propane) is present. 2 . Check for correct wiring and secure connections. 3. Verify the pilot flame is adjusted properly as outlined in Pilot Adjustment. 4. If the pilot is not lit, light pilot as outlined under Lighting Pilot. Allow the pilot to b ...
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Vulcan-Hart GHF91G - page 10
– 10 – 5. Allow temperature to stabilize at new setting and compare temperature tester to dial setting. Recalibrate if the temperature does not fall within the range of 330°F to 370°F. 6. If the temperature does not fall within the limits at both settings, replace the thermostat. PILOT ADJUSTMENT 1. Light pilot as outlined under Lighting Pilo ...
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Vulcan-Hart GHF91G - page 11
– 11 – 3. Turn on the gas and light the pilot as outlined under Lighting Pilot in General. 4. Turn the combination valve to ON. 5. Set the thermostat so the burners will come on. 6. Read the pressure gauge. The manifold pressure reading should match the pressure rating on the data plate. A . To adjust, remove the cap covering the manifold press ...
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Vulcan-Hart GHF91G - page 12
– 12 – 3. Total Shutdown. A . When the high limit trips, 0.0 millivolts will read across both coils of the combination valve, causing both valves to close. B . Pilot relight cannot be accomplished until oil cools sufficiently to allow high limit to close. C . If any wire in the system is cut or broken, the system will shut down. SYSTEM CONDITIO ...
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Vulcan-Hart GHF91G - page 13
– 13 – SCHEMATIC COMPONENT FUNCTION Thermostat - Millivolt type with capillary bulb, single-throw break on temperature rise. Temperature range of 200°F to 400°F. Thermopile - Millivolt control with 24" capillary. Rated to generate 500 millivolts. Combination Valve - Regulates gas flow to burner and pilot. Provides pilot safety. Hi-Limit ...
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Vulcan-Hart GHF91G - page 14
– 14 – TROUBLESHOOTING SYMPTOM 1 . The temperature of the shortening drops, or excessive recovery time is required. POSSIBLE CAUSE A . Insufficient gas supply to unit. B . Ventilating system pulling heat out of heat exchanger and flue box. C . Overloading fryer capacity. A . Malfunctioning thermopile or loose/dirty connection in thermopile. B . ...
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Vulcan-Hart GHF91G - page 15
– 15 – SYMPTOM 4. Leaking tank. TROUBLESHOOTING POSSIBLE CAUSE A. Foam-over by depleted shortening permits oil to drip from the tank surface, giving the appearance of leaking. B . Careless draining procedures. Gas valve should be in the PILOT or OFF position before draining oil. Burners heating an empty tank will damage tank joints. C . Carbon ...
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Vulcan-Hart GHF91G - page 16
– 16 – FORM 35618 (11-04) PRINTED IN U.S.A. NOTES ...
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