G - Physics – 05 – D
Patent
G - Physics
05
D
341/27
G05D 23/20 (2006.01) F23N 5/20 (2006.01)
Patent
CA 2003235
-20- ABSTRACT OF THE DISCLOSURE 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 opera- tion. Actuation of the heating thermostat energizes a third switch and associated relay drive which energizes the induced draft blower. A high temperature thermosat located to sense excessive furnace temperatures is also connected to actuate the third relay to energize the induced draft blower in an excessive temperature condi- tion. 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.
R.e. Phelon Company Inc.
Swabey Ogilvy Renault
Williams Roger W. Jr.
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