Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1975-12-15
1977-03-22
Cohan, Alan
Heat exchange
Movable heating or cooling surface
Rotary drum
361191, G05D 2319
Patent
active
040131190
ABSTRACT:
A control system for controlling the operation of an air conditioning system having a heating mode capability, a cooling mode capability, and a common air distribution fan motor including a thermostatically operated heat switch; a thermostatically operated cool switch; a common fan motor control relay for operating the system fan motor; a cool control relay for operating the system in the cool mode energized upon closure of the cool switch; a heat control relay for operating the system in the heat mode energized upon closure of the heat switch; and, a diode network connecting the coil of the fan control relay to the cool switch and to the heat switch to energize the common fan control relay when either the heat switch or the cool switch is closed while preventing feedback from the heat control relay through the cool switch when the cool switch is closed and while preventing feedback from the cool control relay through the heat switch when said heat switch is closed.
REFERENCES:
patent: 2939121 (1960-05-01), Sagkay
patent: 3415310 (1968-12-01), Kuhlmann
patent: 3785433 (1974-01-01), Ballard
Cohan Alan
Powell B. J.
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