Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1982-09-24
1984-07-31
Makay, Albert J.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
237 123B, 237 123A, 236 91F, 236DIG2, 1374875, 251 27, 251 614, 165 39, G05D 2300
Patent
active
044625413
ABSTRACT:
A desired temperature within the passenger compartment (10) of a motor vehicle is selected by occupant movement of a control lever (80) for a variable resistor (VR2). The temperature of conditioning air being supplied to the compartment is measured by a thermister (72). The two temperatures are electronically compared. If the measured temperature is higher than the selected temperature, a solenoid (62) is energized which moves a control valve (48) in a position allowing passage of pressurized air into an air cylinder (26). The air cylinder (26) functions to close a valve (22) in a water line (18, 20) which extends from the engine cooling system to a heat exchanger (24) located within the conditioning air duct (12). When the temperature of the conditioning air falls below the selected temperature level, the solenoid (62) is de-energized and a spring (54) moves the control valve (58) into a position in which it blocks flow of compressed air to the air cylinder (26) and vents the air cylinder to the atmosphere. A spring (34) in the vented air cylinder (26) moves the valve (22) in the water line to an open position. Hot water from the engine cooling system is then able to flow into the heat exchanger (24) and heat the conditioning air.
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Barnard Delbert J.
Bennett Henry
Makay Albert J.
Red Dot Corporation
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