Solid state emergency heat circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 30, 1990
Grant Date -
N/A
app pub date -
Jun 23, 1989
filing date -
Jun 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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