Solid state emergency heat circuit

Details Solid state emergency heat circuit Solid state emergency heat circuit

1989-06-23

1990-01-30

Tanner, Harry B.

Automatic temperature and humidity regulation

Hot-air furnace

236 94, 364187, G05D 2300, G05B 902

Patent

active

048968285

ABSTRACT:
An emergency heat circuit for a microprocessor-controlled furnace has a first emergency heat switch with one terminal in contact with a rectifier circuit that provides a DC voltage when the thermostat calls for heat, and another terminal connected to an emergency heat-active input of the microprocessor. A first opto-isolator has an optical actuator, such as an LED connected to the microprocessor failure output and a switched element unless such as a photo-transistor, with terminals connected in parallel to the first emergency heat switch. A second opto-isolator is also connected to the emergency heat switch and has an AC photo-actuated switch element, such as a photo-triac, connected, for example, to the W conductor and with an output connected to the rectifier circuit. The photo-triac latches on until the thermostat is satisfied.

REFERENCES:
patent: 4421268 (1983-12-01), Bassett et al.
patent: 4426850 (1984-01-01), Reedy
patent: 4723703 (1988-02-01), Thompson
patent: 4729207 (1988-03-01), Dempsey et al.
patent: 4807588 (1989-02-01), Bentley et al.
patent: 4831511 (1989-05-01), Hanson

Affiliated with

Also associated with

Rating

Solid state emergency heat circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid state emergency heat circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid state emergency heat circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1919651