Whirlpool 4322452 manual Thermostat Switch Contacts Oven Ignitor Safety Valve

The Thermostat contains a set of contacts that open and close, (see Figure 4-11A), depending on the temperature selected by the customer, and the temperature monitored in the oven cavity. When the thermostat is turned to the “ON” position, contacts within the thermostat close to complete an electrical circuit (see Figure 4-11B). As the oven heats up to a selected temperature, the internal pressure within the sensing bulb increases until the thermostat contacts are forced open (see Figure 4-11C).

OFF

BROIL

550

500 450 400

200

250 300

350

	200	250
			300
OFF			350
BROIL			400
			450
		550	500
			3. Oven Temp Reached
2. Oven On			Pressure Expands Sensor Actuator

	1. Oven Off		Oven
	Switch Open	Thermostat
Shaft
Sensor			Switch
Actuator			Contacts

Shaft Rotates Against	& Pushes Against Switch Actuator
Actuator - Switch Closes	- Switch Opens - Oven Turns Off

Sensing Bulb

	A	B	C
			200˚ Heat From Oven
		Figure 4-11
L1	Thermostat		N
	Switch Contacts	Oven Ignitor	Safety Valve

Figure 4-12

As the oven cools, the pressure from the sensor actuator decreases, and the thermostat contacts close. This cycling of the contacts opening & closing continues until the cooking function is complete. The electrical contacts of the thermostat complete an electrical circuit through the ignitor and safety valve to the neutral side of the 120-volt circuit (see Figure 4-12).

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