Control circuit for a forced-air heating system

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

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Details

110186, 110190, 318806, 417 63, 388910, 388917, 388934, F23N 518, F04B 2100

Patent

active

048421901

ABSTRACT:
A control circuit for a forced-air heating system comprises a silicon diode that is positionable in thermally-conductive relationship with the interior space of a furnace plenum. A current source supplies current to the silicon diode, and the potential drop across the silicon diode is sensed. The operating speed of the blower is controlled in response to the voltage drop across the silicon diode in a manner such that when the temperature in the plenum is below a first level, the blower is not driven; when the temperature reaches the first level, the blower is driven at a first speed; and when the temperature reaches a second level, which is higher than the first level, the blower is driven at a second speed, which is higher than the first speed.

REFERENCES:
patent: 2835447 (1953-11-01), Calahan
patent: 2838243 (1954-12-01), Peters
patent: 3726473 (1973-04-01), Sapir
patent: 3801888 (1974-04-01), Faulkner
patent: 3896359 (1975-07-01), Olander et al.
patent: 3912162 (1975-10-01), Bauer et al.
patent: 4123000 (1978-10-01), Miller
patent: 4137770 (1979-02-01), Trout
patent: 4373662 (1983-02-01), Bassett et al.
patent: 4397201 (1983-08-01), Mann

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