Whirlpool 4322452 manual Standing Pilot

The interaction between the thermostat and the safety valve is very important and critical to the operation of the oven. The thermostat provides two separate functions each time it is turned on, but first, we need to know what the thermostat does when it is in the “OFF” position. Even with the thermostat in the “Off” position, a supply of gas from the manifold pipe is always available through the thermostat to the oven pilot assembly. It supplies enough gas to maintain a constant or “standing” pilot flame in the oven at all times (see Figure 4-4).

Standing

Pilot Flame

Standing Pilot

Assembly

BROIL

OFF T

PA

L N

550

500

OFF

200

250

300

350

450 400

Figure 4-4	The Standing Pilot
	Thermostat Off

When the thermostat is turned “ON” to any temperature, its primary function is to increase the flow of gas to the oven pilot assembly so that the “standing” pilot flame enlarges to create a “larger standing pilot” or a “heater pilot flame.” This larger flame is deflected by a flame spreader (see Figure 4-5) to heat the sensing bulb from the safety valve and hydraulically open it.

Heater Pilot

Flame Spreads

Down To Sensing Bulb

Flame Spreader

Safety Valve

Sensing Bulb

Heater Pilot

Flame Wraps

Around Sensor

			200	250
	OFF			300
				350
P	OFF	T		400
		A
L		N
	BROIL			450
				500
				550

The Standing Pilot

Thermostat On

Figure 4-5

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