Electronic thermostat for heating and cooling system

F - Mech Eng,Light,Heat,Weapons – 23 – N

Patent

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Details

341/27, 342/13.6

F23N 5/20 (2006.01) F25B 29/00 (2006.01)

Patent

CA 1260110

ABSTRACT A programmable electronic thermostat for use in a building having a furnace and an air conditioning system adapted to generate energizing signals for the furnace and the air conditioner. An operator programs the thermostat with a series of desired temperatures over a repetitive heating or cooling cycle. During the winter, relatively high temperatures will typically be programmed during the period when the building is occupied and relatively low temperatures during unoccupied periods. The thermostat includes a clock that interrogates the program to generate the desired temperature for the present time which is compared to the measured temperature within the building to generate control signals for the furnace. In order to energize the air conditioning system during occasional periods of occurrence of high temperature, a control temperature is derived for the air conditioner. The derived control temperature is either a first, relatively low control temperature if the heating program indicates that the building is generally occupied during that time, or a second, relatively higher control temperature if the program indicates that the building is unoccupied. If one of either the furnace or air conditioner has been energized within a predetermined time period, the control temperature is not changed and the other of the furnace or air conditioner will not be energized. Under complementary circumstances, if the thermostat is programmed to control the air conditioner, control temperatures to control the furnace are selected depending whether the building is generally occupied or unoccupied.

502244

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