Frymaster GF14 - Manual (Page 5)

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GF14/GF40 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1.1 Functional Description
The GF14 and GF40 Series fryers contain a welded steel (stainless or cold-rolled) frypot that is
heated by gas flames diffused over its lower surface by deflectors. In both units, the deflectors are
made of stainless. The rear deflector on the GF14 is attached to the flue. The GF40’s rear deflector is
attached to the burner manifold.
The flames originate from orifices in a U-shaped burner manifold positioned beneath the frypot.
The orifice diameters differ for natural and Propane (LP) gas and for fryers as indicated in the
accompanying table (NOTE: This table shows only the orifices used in elevations up to 1999
feet/609 meters. GF14 fryers have one orifice per deflector; GF40 fryers have two orifices per
deflector assembly.
Fryer & Gas Type Inches Millimeters
GF14 Natural 0.065 1.65mm
GF14 Propane (LP) 0.041 1.05mm
GF40 Natural 0.057 1.45mm
GF40 Propane (LP) 0.034 0.86mm
GF14/GF40 Series Orifice Sizes (0-1999 ft/609 m)
An electromechanical millivolt gas valve regulates gas flow to the burner manifold. GF14/GF40
fryers use a pilot ignition system to control burner firing.
Pilot Ignition System
The pilot ignition system is made up of the pilot orifice, pilot hood, and a thermopile. The pilot
serves two purposes: lighting the burner and heating the thermopile. In operation, 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.
Both the GF14 and the GF40 burners have metal
targets. The GF40 has two orifices per target. The rear target is attached to the manifold on the
GF40. It is attached to the cabinet in the GF14.