Functional Description, Pilot Ignition System

35 SERIES GAS FRYERS

CHAPTER 1: SERVICE PROCEDURES

1.1Functional Description

The 35 Series fryers contain a welded steel (stainless or cold-rolled) frypot that is directly heated by gas flames that are diffused evenly over its lower surface by ceramic deflectors (targets).

The flames originate from orifices in a U-shaped burner manifold positioned beneath the frypot. The orifice diameters differ for natural and LP gas as indicated in the accompanying table.

35 Series Orifice Sizes (0-1999 ft/609 m)

Gas	Inches	Millimeters
Natural (G20/25)	0.0669	1.70mm
LP (G31)	0.0413	1.05mm

Gas flow to the manifold is regulated by an electromechanical gas valve. This series of fryers is equipped with a millivolt gas valve and all models use a pilot ignition system.

Pilot Ignition System

The pilot ignition system is made up of the pilot orifice, pilot hood, and a thermopile. The pilot serves two purposes: light the burner and heat the thermopile. In operation, the thermopile is in con- tact with the pilot flame and generates millivolts. The millivolt output passes through a normally closed high-limit switch and energizes the gas valve pilot coil, which in turn opens the pilot valve. If the pilot flame is extinguished, voltage is lost to the gas valve pilot coil and the pilot valve closes

Control Options

The temperature control knob on FM/MJ35 fryers is located behind the hinged front panel, out of sight. On FM/MJ35G fryers, the knob is exposed on the face of the front panel. The MJ35G model may be equipped with optional basket lifts. The basket lift option requires an electrical power supply.

Thermostats

Fryers in this series are equipped with an adjustable controlling (operating) thermostat. The temperature at which the thermostat opens and closes is adjusted by turning the temperature control knob referenced above. The controlling thermostat used in the 35 Series fryers is sensitive to one-degree changes in temperature.

All 35 Series fryers are 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 high-limit thermostat is the same for CE and Non-CE applications, but the terminals for attaching it to the gas valve differ. When a replacement high-limit thermostat is ordered, the terminals for both applications are furnished in the kit.

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