Remington HH-70T-KFA Service Manual download pdf (Page 17)

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Phone: 800-362-6951 • Fax: 800-255-7985

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Toro Service Info.

BREAKER ASSEMBLY

CAD CELL ASSEMBLY

Toro Service Information

Troubleshooting the Flame Out Safety

The Safety Flameout Control operates on the photoelectric principle

whereby the presence or absence of light is changed to OHMs of

resistance by the cad cell and monitored by the PC Board. The system

consists of the flame detector (cad cell), printed circuit board (PCB) and

the circuit breaker.

The function of these parts as a whole is to monitor the flame in the

combustion chamber and to shut off power to the heater if no flame is

present after about 20 seconds.

All power is supplied to the heater through the circuit breaker. The circuit

breaker is controlled by the printed circuit board (PCB) which receives a

sensing signal from the flame detector (cad cell) based upon the amount

of light it “sees”.

During normal operation the flame detector is energized by the light of

the burner flame and the safety circuit is not activated. When the absence

of flame exists the flame detector does not sense light and activates the

safety circuit. When the safety circuit is energized the small neon light on

the PC Board will light up. This indicates that the timed cycle for

automatic shut down has started and if the burner does not ignite within

20-35 seconds the main circuit breaker will trip shutting off all power to

the heater.

If you find one of these parts are defective, they are no longer available.

Please call for assistance.

There are two conditions that will alert you to a malfunctioning system:

1. The heater will continue to run after cool down cycle is completed

with no flame in combustion chamber.

2. The circuit breaker will trip prematurely with a well established flame

present in the combustion chamber.

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Remington HH-70T-KFA Service Manual Page 17