Warm up method for two stage furnace

Details Warm up method for two stage furnace Warm up method for two stage furnace

1993-07-08

1994-07-05

Tanner, Harry B.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

236 46E, 236DIG9, G05D 2300

Patent

active

053260252

ABSTRACT:
A two-stage furnace is operable at a high fire full rate mode and at a low fire partial rate mode when there is a call for high heat or low heat, respectively. In order for the furnace to be less prone to vent gas condensate formation when operating at low fire, and to permit the heat exchanger and vent pipe to reach equilibrium as soon as possible on both low fire and high fire, a shorter blower-on delay is provided for high fire and longer blower-on delay is provided on low fire.

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