Diagnostic thermostat
First Claim
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1. A diagnostic thermostat for a building employing a single-zone heating system, comprising:
- first means for sensing indoor temperature,second means for sensing outdoor temperature,third means for cycling a furnace on and off in response to the level of the indoor temperature,fourth means for measuring time,fifth means for setting a desired indoor temperature,microprocessor means for determining, on the basis of signals from the first, second, third and fourth means, the heating performance of the building over a given period of time, andsixth means for displaying said heating performance expressed as a function of BTUs per degree day.
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Abstract
A diagnostic thermostat for a building includes an indoor temperature sensor, an outdoor temperature sensor, and a standard arrangement for cycling a furnace on and off in response to the level of the indoor temperature. A time clock is included and the desired indoor temperature can be set. A microprocessor determines, on the basis of various signals, the heating performance of the building over a given period of time, and this heating performance can be displayed.
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Citations
14 Claims
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1. A diagnostic thermostat for a building employing a single-zone heating system, comprising:
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first means for sensing indoor temperature, second means for sensing outdoor temperature, third means for cycling a furnace on and off in response to the level of the indoor temperature, fourth means for measuring time, fifth means for setting a desired indoor temperature, microprocessor means for determining, on the basis of signals from the first, second, third and fourth means, the heating performance of the building over a given period of time, and sixth means for displaying said heating performance expressed as a function of BTUs per degree day. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of diagnosing the heating performance of a building which includes a furnace and employs a single-zone heating system, comprising the steps:
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(a) sensing indoor temperature and providing a first signal based thereon, (b) sensing outdoor temperature and providing a second signal based thereon, (c) cycling the furnace on and off in response to the level of the indoor temperature as compared to a desired indoor temperature, (d) measuring time, and (e) on the basis of said time measurement, said first and second signals and the on and off signals, determining electronically the heating performance of the building over a given period of time expressed as a function of BTUs per degree day. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification