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Firewood, Heating and Wood Burning Equipment
Furnace fan relays????
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<blockquote data-quote="AOD" data-source="post: 1256792" data-attributes="member: 28606"><p>Most are made by Honeywell or Mars. A typical setup is a single pole, double throw relay. There is a normally closed side and a normally open side with a "tounge" in between, similar to a 3 way light switch. The NC side typically feeds power to the LOW speed of the furnace fan for heating use. the NO side is connected to the HIGH speed winding of the motor for use with air conditioning. When the relay is energized the "tounge" moves from the NC to the NO position allowing the fan to change speeds. </p><p></p><p>Confused yet?</p></blockquote><p></p>
[QUOTE="AOD, post: 1256792, member: 28606"] Most are made by Honeywell or Mars. A typical setup is a single pole, double throw relay. There is a normally closed side and a normally open side with a "tounge" in between, similar to a 3 way light switch. The NC side typically feeds power to the LOW speed of the furnace fan for heating use. the NO side is connected to the HIGH speed winding of the motor for use with air conditioning. When the relay is energized the "tounge" moves from the NC to the NO position allowing the fan to change speeds. Confused yet? [/QUOTE]
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