Frymaster 45 Series manual Functional Description

45 SERIES GAS FRYERS SERVICE AND PARTS MANUAL

CHAPTER 1: SERVICE PROCEDURES

1.1Functional Description

The 45 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 targets.

The flames originate from orifices in a U-shaped burner manifold positioned beneath the frypot. The orifice diameters differ for natural and propane gas as indicated in the table below (see Page 2-7 for a complete list of available orifices).

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

Gas	Inches	Millimeters
Natural	0.057	1.45
Propane	0.034	0.86

Gas flow to the manifold is regulated by an electromechanical gas valve. This series of fryers is equipped with a 24-volt gas valve and all models use a pilot ignition system.

PILOT IGNITION SYSTEM

The pilot ignition system is comprised of the pilot orifice, pilot hood, and a thermopile. The pilot serves two purposes. The first is to light the burner, the second is to heat the thermopile. In opera- tion, the thermopile is in contact 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. A separate 24-volt circuit, activated by the fryer ON/OFF switch, pro- vides voltage through the thermostat or controller to the gas valve main coil, which opens the main valve. The gas valve is constructed so that the main valve will not open if the pilot valve is not open. The pilot flame must be manually lit (either with a match or with an optional built-in piezo igniter) when the fryer is first placed into operation.

		ON/OFF
		Switch	Line Voltage
Controlling Thermostat			Line Voltage
			24 VAC
or		Main Coil
			Transformer
Controller
		Gas Valve
			High-Limit
			Thermostat
		Pilot Coil
	Thermopile
	Pilot	The Pilot System
		1-1