Emergency heating system control circuit

Details Emergency heating system control circuit Emergency heating system control circuit

1981-02-23

1982-09-14

Wayner, William E.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

307 66, H02J 700, F24D 510

Patent

active

043491480

ABSTRACT:
This invention relates to a DC powered emergency heating system control circuit for use in combination with a gas furnace that includes an AC power supply for a thermostat to control a normally operated AC powered automatic gas valve, which gas valve provides gas for burning in a plenum chamber. The control circuit includes an auxiliary fan and circuits responsive to the interruption of AC power to provide in a repetitive sequence, DC power pulses of one polarity to the automatic gas valve, followed by energization of the auxiliary fan, followed by the application of DC power of an opposite polarity to the gas valve. This repetitive sequence thereby ensures alternate periods of convection and auxiliary fan induced forced air heating while simultaneously protecting the normally AC powered gas valve from the deleterious magnetism effect brought on by the continuous emergency DC powered operation of the gas valve.

REFERENCES:
patent: 4129811 (1978-12-01), Pearson
patent: 4242078 (1980-12-01), Nelson et al.
patent: 4249696 (1981-02-01), Donnelly et al.

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