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Furnace panel safety switch.
A furnace switch is more accurately called a furnace disconnect or furnace disconnect switch.
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.
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.
Those names are pretty self explanatory.
Three furnace safety switches.
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.
The limit switch is a part that stops the furnace from overheating.
This is the switch used disconnects the power to the furnace turning it on and off as needed.
The blower door safety switch is a simple plunger that when opened cuts the power to your gas fired furnace.
Meanwhile the other black wire coming from the safety switch towards the furnace door connects with the brass screw situated at the base of the safety switch.
Most building codes require a furnace switch or disconnecting means within sight of the furnace itself.
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The pilot sensor makes sure that the pilot light is on before sending gas into the combustion chamber.
If so the gas valve closes.
In the typical furnace there are three different safety mechanisms that all have to be working properly in order for the furnace to run.
Icp tempstar heil furnace door switch 1010886 hq1010886emb latch comfort maker.
All furnaces have a power cutoff switch inside the blower compartment that disconnects power to the furnace controls when the front panel is removed.
This switch monitors the temperature of the furnace plenum and detects when it is too high above the switch s settings.
After attaching the wire to the safety switch.
