Warmup method for a two stage furnace

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control

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236 1EB, G05D 2300

Patent

active

049764594

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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