Warmup method for a two stage furnace

Details Warmup method for a two stage furnace Warmup method for a two stage furnace

F - Mech Eng,Light,Heat,Weapons

24

H

341/16, 126/17

F24H 3/00 (2006.01) F23N 1/02 (2006.01) F23N 5/20 (2006.01)

Patent

CA 2027978

ABSTRACT The present invention involves a two stage furnace and a method of warming its heat exchanger. The furnace includes a gas valve with low and high combustion settings, and inducer and circulator fans with low and high speed settings. When a call for heat is present, the inducer fan and gas valve operate at high. After a heat on delay period, the circulator fan operates at low speed to provide an initial warm stream of air from the furnace.

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