Stoves and furnaces – Hot-air furnaces – Liquid or gaseous fuel
Reexamination Certificate
2005-08-09
2005-08-09
Lu, Jiping (Department: 3749)
Stoves and furnaces
Hot-air furnaces
Liquid or gaseous fuel
C126S1100AA, C126S11000R, C236S011000, C236S04400R, C431S012000
Reexamination Certificate
active
06925999
ABSTRACT:
A multistage furnace for heating residential or commercial spaces is operated by a single stage thermostat and a return air temperature sensor providing sensed temperature information to a controller. The furnace is started at a first, low firing rate and after a predetermined time is increased to a second firing rate if the rate of change of temperature of air returning to the furnace from the space is less than a predetermined amount. The method of operation is carried further to increase the firing rate to second and third rates based on predetermined rates of temperature change of return air from the enclosed space as sensed by the return air sensor.
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Holmes Leonard W.
Hugghins Gordon Jeffrey
American Standard International Inc.
Beres William J.
Lu Jiping
O'Driscoll William
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