Blower control circuit for a furnace

Details Blower control circuit for a furnace Blower control circuit for a furnace

1987-03-20

1988-09-27

Tanner, Harry B.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

236 46F, F24D 510

Patent

active

047735864

ABSTRACT:
A blower control circuit for a furnace includes a blower relay having normally-open contacts connected in the power circuit to the blower. Energization of the relay via a drive circuit serves to close the contacts and thereby operate the blower. Control of the drive circuit resulting in relay energization is effected by either a time-delay circuit which responds to a space thermostat or a safety sense circuit which responds to a high temperature limit thermostat.

REFERENCES:
patent: 3921899 (1975-11-01), Hamilton
patent: 4140274 (1979-02-01), Nabinger
patent: 4189091 (1980-02-01), Ballard et al.
patent: 4234124 (1980-11-01), Yarrow
patent: 4290274 (1981-09-01), Essex
patent: 4373662 (1983-02-01), Bassett et al.
patent: 4502625 (1985-03-01), Mueller
patent: 4684060 (1987-08-01), Adams et al.

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