Vulcan-Hart ML-135504, ML-135503 Service Procedures and Adjustments, Millivolt Controls Test

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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 burn for 3 to 4 minutes to stabilize.

A.If the pilot remains lit, proceed to step 6.

B.If the pilot will not remain lit, proceed to step 5.

5.Connect DC voltmeter to terminals TH TP and TP of combination valve. Relight the pilot, hold the combination valve knob in and allow the pilot to burn for 3 to 4 minutes to stabilize.

A.If the voltage measures 450 millivolts or greater and the pilot will not stay lit, replace the combination valve.

B.If the voltage is less than 450 millivolts, measure the voltage at terminals NO and C of high limit.

1)If the voltage is 500 millivolts or more, replace the high limit.

2)If the voltage is less than 500 millivolts, disconnect the lead wire from terminal TH TP of the combination valve and remeasure voltage at the high limit.

a.If the voltage is less than 500 millivolts, replace the thermopile.

b.If the voltage is 500 millivolts or more, replace the combination valve.

6.Connect DC voltmeter to terminals TP and TH of combination valve.

7.Turn combination valve to ON. Turn thermostat to a setting higher than the shortening temperature.

A.If the voltage measures 150 millivolts or more but the burners do not ignite, replace the combination valve.

B.If the voltage is less than 150 millivolts, measure the voltage between terminals NO of the high limit and TP of the combination valve.

1)If the voltage is 200 millivolts or greater, replace the thermostat.

2)If the voltage is less than 200 millivolts, replace the combination valve.

THERMOSTAT CALIBRATION

1.Place temperature tester in the fry tank near the thermostat bulb.

2.Set the thermostat to 300°F and allow the temperature to stabilize.

3.Check the temperature tester reading against the thermostat dial reading. If there is a variance of more than ±20°F (280°F to 320°F), calibration is required.

Calibration Steps

1.Remove thermostat knob from shaft.

2.Using a small screwdriver, rotate the setscrew inside the hollow shaft counterclockwise to increase the temperature or clockwise to decrease the temperature (1/4 turn equals approximately 18°F).

3.Allow temperature to stabilize and recheck temperature. Repeat until the temperature falls within the limits as stated in step 3 under Thermostat Calibration.

4.Install thermostat knob and set dial to 350°F.

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Contents GHF Series Heavy Duty Range Matching GAS Fryers & Frymates Table of Contents General SpecificationsIntroduction ToolsCovers and Panels Removal and Replacement of PartsBurners DoorThermostat Thermopile High LimitCombination Valve Pilot OrificeFRY Tank Millivolt Controls Test Service Procedures and AdjustmentsThermostat Calibration Calibration StepsBURNERS, Nozzles and Orifices Pilot AdjustmentBurners Nozzles and OrificesCombination Valve Regulator Adjustment System Condition Quick Check Procedures Electrical OperationControl System Description Schematic Component Function Symptom Possible Cause TroubleshootingTroubleshooting Form 35618

GHF90G, GHF91G, ML-135504, ML-135503 specifications

The Vulcan-Hart ML-135503, ML-135504, GHF91G, and GHF90G are renowned appliances designed to cater to the rigorous demands of commercial kitchens. These models are celebrated for their reliability, efficiency, and advanced features that enhance cooking performance.

The ML-135503 and ML-135504 models are equipped with powerful gas cooking capabilities. They feature heavy-duty cast iron grates that provide durability and excellent heat retention. The adjustable burners allow chefs to control the flame intensity with precision, ensuring that every dish is cooked to perfection. The ergonomic design of the controls enhances user experience, allowing for easy operation even in fast-paced kitchen environments. Another notable feature is the built-in drip trays that simplify cleanup, making these models not only functional but user-friendly.

On the other hand, the GHF91G and GHF90G series serve as ideal solutions for high-volume cooking requirements. These units are engineered with advanced technologies that ensure even heat distribution, allowing for consistent cooking results. The GHF series boasts a robust construction, designed to withstand the rigors of daily use in busy kitchens. Equipped with features such as adjustable thermostats and turbo broil burners, these models facilitate precise temperature control, which is critical for various cooking techniques.

In terms of energy efficiency, Vulcan-Hart has integrated features into the GHF91G and GHF90G to reduce gas consumption while maintaining high performance. This not only contributes to lower operational costs but also aligns with sustainable practices in the food service industry. Furthermore, both series prioritize safety, featuring pilot lights and flame failure devices that enhance operational security.

Overall, the Vulcan-Hart ML-135503, ML-135504, GHF91G, and GHF90G models stand out in the commercial kitchen equipment market due to their exceptional build quality, advanced technologies, and user-oriented features. Chefs and restaurateurs can rely on these appliances to deliver consistent performance, making them invaluable assets in any culinary establishment. Whether it’s grilling, frying, or simmering, these models exemplify Vulcan-Hart's commitment to innovation and excellence in kitchen solutions.
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