Energy and peak-load conserving thermostat and method with contr

Details Energy and peak-load conserving thermostat and method with contr Energy and peak-load conserving thermostat and method with contr

1993-07-27

1994-07-05

Tanner, Harry B.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

236 46E, 236 46F, 165 12, F23N 100

Patent

active

053260260

ABSTRACT:
A thermostat is disclosed for controlling a heating system, particularly a forced hot-air furnace, so as to improve fuel efficiency and decrease peak fuel load. The thermostat controls the length of fuel-on cycles, so that the heat exchanger of the furnace is not saturated. A wide deadband (approximately 3.degree. F.) for the thermostat further aids in lessening fuel usage. Forced air operation continues for a secondary-delivery period immediately after the thermostat turns the furnace off, thereby extracting additional heat from the heat exchanger and ductwork, but the length of the secondary-delivery period is limited so that the heat exchanger does not cool off beyond a predetermined amount.

REFERENCES:
patent: 4090663 (1978-05-01), Bonne et al.
patent: 4094166 (1978-06-01), Jerles
patent: 4136730 (1979-01-01), Kinsey
patent: 4199023 (1980-04-01), Phillips
patent: 4725001 (1988-02-01), Carney et al.
patent: 4938684 (1990-07-01), Karl et al.
patent: 5244146 (1993-09-01), Jefferson et al.

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