Electronic Ignition Configuration - Frymaster 47 Series Service & Parts Manual

Gas fryers

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1.1 Functional Description (cont.)

Electronic Ignition Configuration

In units configured for electronic ignition, an ignition module connected to an ignitor assembly

replaces the pilot system. The ignition module performs four important functions: it provides fuse

protection for the 24-volt circuit, provides an ignition spark, supplies voltage to the gas valve, and

proofs the pilot flame.

The module contains a 4-second time delay circuit and a coil that activates the gas valve. The

ignitor assembly consists of a spark plug, a pilot, and a flame sensor element.

At start-up the ON/OFF switch is placed in the "ON" position, supplying 12 VDC to the heat control

circuitry in the controller or computer and to one side of the heat relay coil on the interface board. If

resistance in the temperature probe indicates the temperature in the frypot is below 180°F (82°C),

the current flows through a melt cycle circuit where a timer switch alternately closes for 3 seconds

and opens for 24 seconds. If the temperature is 180°F (82°C) or above, the current flows through a

heat circuit, bypassing the timer switch. In either case, current is supplied to the other leg of the heat

relay coil which then closes an electronic switch in the 24 VAC circuit to provide current to the

ignition module.

Circuitry in the ignition module sends 24 VAC current to the gas valve via a normally closed high-

limit switch and a drain safety switch. Simultaneously, the module causes the ignitor to spark for 4

seconds to light the pilot flame. A flame sensor verifies that the pilot is lit by measuring the flow of

microamps through the flame. If the pilot does not light (or is extinguished), current to the ignition

module is cut, preventing the main valve from opening, and the ignition module "locks out" until the

power switch is turned "OFF", then back "ON".

47 SERIES GAS FRYERS

CHAPTER 1: SERVICE PROCEDURES

Inside the Ignition Module

Out to

Gas Valve

To Alarm

25 V +

25 V GND

Ignition Wire

1-2

Coil

Flame Sensor

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