Question

 What is a limit switch on a furnace?

Answer A furnace's limit switch is a switch designed to shut off the furnace's burner if the plenum, a chamber which stores heated or cooled air for distribution, becomes too hot. The limit switch may als... Read More »
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What is a pressure switch on a furnace?

A furnace pressure switch is a device that reacts to changes in the pressure of what's inside the furnace. The switch lets electric current flow through the furnace while the pressure is normal. If... Read More »
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Furnace Pressure Switch Symptoms?

A gas-powered, forced-air heating system sends heated air through a network of ducts and vents throughout a home. Gas-powered systems use natural or LP gas as a combustion material to warm a homeâ€... Read More »
http://www.ehow.com/info_12182607_furnace-pressure-switch-symptoms.html

The Pressure Switch on My Furnace Keeps Tripping?

Pressure switches work by detecting the pressure of a fluid and shutting down the system if the pressure changes dramatically. This can help protect many household appliances, including furnaces, h... Read More »
http://www.ehow.com/info_12182332_pressure-switch-furnace-keeps-tripping.html

I want to put a switch on my furnace to turn on my blower.?

Install a second thermostat next to the furnace but only hook up the fan wires. It shouldn't cause a problem with the other thermostat.
http://answers.yahoo.com/question/index?qid=20130429123656AADbvrb


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