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MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-1
1.1 Functional Description
Master Jet (MJ) CF Series Atmospheric gas fryers contain a welded stainless steel 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 shown in the table below. For altitudes of
2000 feet and greater, contact factory for correct orifice part number.
Gas Inches Millimeters
Natural 0.055 1.4
Propane 0.035 0.9
CF Series Orifice Sizes (0-1999 ft/609 m)
Gas flow to the manifold is regulated by an electromechanical gas valve. MJCF Series gas fryers are
equipped with millivolt gas valves, and MJCFE Series gas fryers are equipped with 24-volt gas
valves. All models use a pilot ignition system.
Pilot Ignition System
The pilot ignition system consists of the pilot orifice, pilot hood, and a thermopile (a thermocouple is
also used in CE units per CE requirements). The pilot serves two purposes. The first is to light the
burner, the second is to heat 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.
On MJCFE models, a separate 24-volt circuit,
activated by the fryer On/Off switch,
provides 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
ignitor) when the fryer is first placed into
operation.
High-Limit
Main Valve Magnet
Pilot Magnet
Thermopile
Pilot
Gas Valve
Operating Thermostat
24VAC Transformer
Line Voltage
ON/OFF Switch
The Pilot System (24V Circuit, Non-CE).