Thermostat providing electrical isolation therein between connected heating and cooling transformers
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Mar 14, 1991
filing date -
Mar 14, 1991
priority date (Note) -
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Abstract
A low voltage space thermostat adaptable for controlling a heating-only apparatus or a heating and cooling apparatus. The thermostat includes a DC power supply and a voltage step-up transformer having two primary windings and a secondary winding for supplying electrical power to the DC power supply when there is a demand for heating, cooling, or fan operation. The thermostat also includes circuit means for supplying electrical power to the DC power supply when there is no demand for heating, cooling, or fan operation. The thermostat further includes circuit means, responsive to the existence of electrical power at a particular one of its wiring terminals, for providing electrical isolation, from each other within the thermostat, of two transformers incorporated in a two-transformer heating and cooling apparatus.
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