Lennox pressure switches and carrier pressure switches are two popular furnace pressure switch brands but it is best to purchase based on your furnace model number.
Replacement gas furnace pressure switch.
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A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced air furnace.
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Here is a quick breakdown of the steps involved in replacing a gas furnace pressure switch once you have sourced your new part.
Generally they are a normally open switch that closes with either a rise or fall in the pressure it is monitoring they are used mostly as a safety device but are also used for operation control such as fan cycle controls for low ambient cooling starting and stopping for steam boilers and the list goes on.
Pressure switches are used in a variety of applications.
A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and.
A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace.
If is in the closed position the furnace stops the sequence and goes into lockout mode until the switch is open.
On newer furnaces on a call for heat the ifc checks the pressure switch.
If the pressure switch is stuck it does not send enough power to the inducer and therefore the ignition sequence does not begin.
Pressure switches are used to stop the furnace from operating in an unsafe condition.
The switch is there to prevent the furnace from running unless the correct venting air pressure is present.