Frymaster FBKR18 Series, FBCR18 manual Inside the Ignition Module, Computers, Interface Board

Inside the Ignition Module

Out to

Gas Valve

To Alarm

25 V +

Coil

TD

HV

25 V GND

Ignition Wire Flame Sensor

COMPUTERS

These rethermalizers are equipped with Computer Magic III computers that have been modified for this specialized application. Although similar in appearance to standard Computer Magic III computers, the standard CM III computers will not operate the unit correctly. Only part number 806-8063 may be used in FBCR18 units and only part number 806-9352 may be used in FBKR18 units.

INTERFACE BOARD

An interface board is located in the component box directly behind the control panel. The interface board provides a link between the computer and the rethermalizer’s individual components without requiring excessive wiring, and allows the computer to execute commands from one central point. The part number for the interface board used in this equipment is 806-9295. A simplified illustration of the board is provided below.

J2 J4 HI J4

J1

K1

OPT

B/L-R

K2

OPT B/L-L

K5

BLOWER

K4

HEAT

LATCH

WATER

HEAT

GND +15V

ORANGE

RESISTOR

K3

LATCH

K6

WATER

LO J3

The board contains a heat relay (K4) that switches 24VAC to the ignition and gas valve circuits when the computer heat logic circuit calls for heat. Relay K5 switches 120VAC to the blower motor when K4 closes. The water relay (K6) has two functions. First, it breaks the 24VAC circuit when the water level in the cookpot is below the lower water level sensor. This prevents the burners from firing when the unit is empty. The second function is to supply power to the normally open water

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