Whirlpool SF3000SE W Service Manual page 35

As the ignitor heats up and its electrical resis-
tance decreases, current flow increases
through the bimetal arm heater inside the gas
safety valve. When the ignitor becomes hot
enough and its electrical resistance low
enough, sufficient current is provided (2.5 to
3.0 amps) through the bimetal arm heater, to
cause the arm to flex. This opens the gas
valve and allows gas to flow to the burner,
where the heat from the ignitor (approximately
2500˚F) ignites it, and produces a flame.
LOW CURRENT
FROM IGNITOR
GAS OUTLET
BIMETAL ARM
VALVE CLOSED
BIMETAL HEATER
GAS INLET
IGNITOR
SAFETY VALVE
Cooking Products Service Manual
Original
© 1996 Whirlpool Corporation
The ignitor will remain energized at all times
when the burner is lit. As soon as the oven
reaches its selected temperature, the EOC
relay opens, and power is removed from the
circuit. Once this occurs, the ignitor cools, and
the bimetal arm flexes and closes the gas
safety valve, turning off the gas to the burner
and extinguishing the flame.
HIGH CURRENT
FROM IGNITOR
BURNER
GAS
2-3
4321890
July, 1996
Page 2-3
GAS OUTLET
GAS VALVE
OPENS
HEAT FROM
BIMETAL HEATER
FLEXES ARM
GAS INLET