Whirlpool 4322452 manual BK P3-1 P3-4

Self-Clean ovens use a dual safety valve that is bimetal-operated. The dual valve has one gas inlet and two gas outlets; one for the Bake burner and the other for the Broil burner (see Figure 4-23). It uses two identical electrically-operated devices, one for each outlet, to control thc gas flow. The devices consist of an electric heater coil wrapped around a bimetal strip. One end of the bimetal is riveted to the plate of the valve. The other end has a rubber seat attached to it that covers a gas outlet. At room temperature, the spring force of the bimetal presses the rubber seat against the gas outlet.

	Broil Burner
	Gas Outlet
Broil Bimetal
Terminals	Bake Bimetal
Main Gas Inlet		Terminals
Dual	Bake Burner	Figure 4-23
Safety Valve	Gas Outlet

When current flows through the ignitor, heat is applied to the bimetal strip. The amount of heat necessary to warp the bimetal enough to open the valve requires 3.0 amps of current flow in the circuit (see Figure 4-24). The reason the valve is designed not to open below 3.0 amps, is to insure that the temperature of the oven ignitor is above 1800˚F before the valve opens.

To prevent miswiring, the Bake terminals and Broil terminals are sized differently.

Gas Outlet

To Bake Burner

Bake Terminals

Bake

Gas Valve

Bimetal

Coil

Bimetal

Coil

Broil

Gas Valve

Figure 4-24

Broil Terminals

Gas Outlet

To Broil Burner

The electrical circuit is initiated by relays on the electronic control board. The electrical circuit is similiar to the circuit used with the Glo-Bar Ignition System (see Figure 4-25).

L1	OVEN CONTROL
	BROIL RELAY
BK P3-1	P3-4

BAKE VALVE

BAKE IGNITOR

RW

OVEN CONTROL

BAKE RELAY

P2-4 P2-1

N

W

Figure 4-25

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