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Lower ignitor resistance increases the current flow through the bimetal coil. When the ignitor is fully
heated, its resistance is low. Low resistance causes maximum current to flow through the bimetal
coil (2.5 to 3.6 amps).
IGNITOR
OVEN CONTROL
RELAY
BIMETAL
COIL
NL1
LO HI
OHMS
LO HI
AMPS
As the bimetal coil heats, it heats the bimetal arm inside the gas safety valve.
BIMETAL ARM
GAS OUTLET
VALVE CLOSED
GAS INLET
BIMETAL
COIL HEATS
LOW
CURRENT
FLOW
(IGNITOR
IS COLD)
As the bimetal arm heats, it bends and opens the gas safety valve outlet to the burner.
GAS OUTLET
VALVE OPEN
GAS INLET
BIMETAL
COIL HEATS
& BENDS ARM
HIGH
CURRENT
FLOW
(IGNITOR
IS HOT)