The limit switch is a part that stops the furnace from overheating.
Furnace panel safety switch.
After attaching the wire to the safety switch.
Most building codes require a furnace switch or disconnecting means within sight of the furnace itself.
The pilot sensor makes sure that the pilot light is on before sending gas into the combustion chamber.
But there s still power coming into the furnace so always turn off the furnace power at the switch on the side of the furnace and at the circuit breaker panel before disconnecting any wires or testing replacing any parts.
Take note that the black wire from the breaker is the one needed to be attached with the brass screw located on top of the safety switch.
Three furnace safety switches.
Your furnace is equipped with a plethora of safety devices flame rollout sensors flame sensors not the same thing despite a similarity in name limit switches serviceman s switch all designed to increase your safety.
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If so the gas valve closes.
The blower door safety switch is a simple plunger that when opened cuts the power to your gas fired furnace.
A furnace switch is more accurately called a furnace disconnect or furnace disconnect switch.
This switch monitors the temperature of the furnace plenum and detects when it is too high above the switch s settings.
All furnaces have a power cutoff switch inside the blower compartment that disconnects power to the furnace controls when the front panel is removed.
In the typical furnace there are three different safety mechanisms that all have to be working properly in order for the furnace to run.
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A typical 120v door interlock safety switch should conduct power and show 115 120v across the switch when electrical power to the air handler or furnace is on and the door is latched or the switch button is depressed.
