Frymaster FPD, SCFD Electronic Ignition Configuration cont, Control Options, Service Procedures

DECATHLON SERIES GAS FRYERS

CHAPTER 1: SERVICE PROCEDURES

Electronic Ignition Configuration (cont.)

The module contains a 60-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. NOTE: The listed melt cycle times and exit temperature pertain to the Compu-Fry computer only.

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 up to 60 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 interrupted, preventing the main valve from opening, and the ignition module "locks out" until the power switch is turned OFF, then back ON.

A temperature probe monitors the temperature in the frypot. When the programmed setpoint temperature is reached, resistance in the probe causes the heat cycle circuitry in the controller to interrupt current flow through the heat relay. This in turn interrupts the 24 VAC current to the ignition module, resulting in closure of the gas valve.

NOTE: In September 2006, these modules were replaced with black Honeywell modules (Kit, 826- 2117). Operationally they are similar. The new modules have a 4.5 second delay before sparking and lockout at 90 seconds. Unlike previous modules, microamp readings on the new black modules will move up and down as the module pulses on and off and this is an indication that the module is functioning.

When installing the new modules into an older unit with a Fast GO board, a resistor (provided in module kit) is needed to adjust melt cycle to accommodate the 4.5 second delay.

Control Options

Decathlon Series gas fryers may be equipped with operating thermostat controls (optional backup- only; available with electronic thermostat or computer), Thermatron, or Compu-Fry computers.

In fryers equipped with Thermatron, the fryer is turned on and off by means of a rocker switch and the temperature is set by adjusting a potentiometer. An interface board is located in the component box (shield) behind the control panel (computer-equipped) or in a component box inside the cabinet (Thermatron-equipped).

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