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Door switch

Posted by Harold Kestenholz - Hydronic Network on December 22nd, 2000 11:51 PM
In reply to Lennox Gas Furnace Rattle by Jeff on December 22nd, 2000 10:42 PM [Go to top of thread]

Very often a switch is located at the door to stop operation if the door is removed. This provides physical service safety and unfiltered air from entering the exchanger/coil area to foul the ductwork. Basement or attic air should not be used as return air, so the switch would also prevent this.

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