Electronic control system for a gas-fired/hot air furnace with i

Details Electronic control system for a gas-fired/hot air furnace with i Electronic control system for a gas-fired/hot air furnace with i

1989-03-30

1990-03-13

Tanner, Harry B.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

236 46E, 236DIG9, 431 20, 110162, F24H 300

Patent

active

049077376

ABSTRACT:
Electronic control system for a gas-fired/hot air furnace includes a primary control unit which controls the flow of fuel to the furnace. The furnace has heating and cooling space thermostats and a comfort fan to supply heated or cooled air to the space being monitored by the thermostats and an induced draft blower which supplies combustion air into the furnace for heating. A first switch and associated relay drive selectively energizes the comfort fan for low speed heating operation and a second relay switch and associated relay drive selectively energizes the comfort fan for high speed cooling operation. Actuation of the heating thermostat energizes a third switch and associated relay drive which energizes the induced draft blower. A high temperature thermostat located to sense excessive furnace temperatures is also connected to actuate the third relay to energize the induced draft blower in an excessive temperature condition. The high temperature thermostat is also connected to the relay drive of the second relay switch to energize the high speed operation of the comfort fan in the event of excessive furnace temperature.

REFERENCES:
patent: 2230446 (1941-02-01), Baker
patent: 2238000 (1941-04-01), Nessell
patent: 3454078 (1969-07-01), Elwart
patent: 3726473 (1973-04-01), Sapir
patent: 4773586 (1988-09-01), Ryan
patent: 4789330 (1988-12-01), Ballard et al.

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