Electronic programmable thermostat

Details Electronic programmable thermostat Electronic programmable thermostat

G - Physics

05

D

341/27, 341/32,

G05D 23/19 (2006.01) G05D 23/24 (2006.01)

Patent

CA 1301287

MIL-082 4B6 Abstract of the Disclosure An electronic programmable thermostat for the control of a furnace or air conditioner is useful as a replacement for a conventional non-programmable thermostat and mounts on the non-programmable thermostat's wall plate to achieve support, electrical connection with the load and power supply, and the use of certain manual controls supported on the wall plate. The programmable thermostat employs a circular printed circuit board supporting its electronic components, which include a potentiometer for operator adjustment of desired temperature. A flat circular knob supported on the potentiometer shaft and an annular bezel cover the thermostat and allow access to the manual controls supported on the wall plate. The potentiometer and a temperature sensing thermistor control the frequency of a pulse generator which provides input to a counter. The resulting digital signal is compared with a digital signal generated under control of a clock and manually actuable programming switches, to generate an output control signal for the load.

615799

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