Thermostat providing electrical isolation therein between connec

Details Thermostat providing electrical isolation therein between connec Thermostat providing electrical isolation therein between connec

1991-03-14

1992-07-07

Ford, John K.

Heat exchange

With alarm, indicator, signal, register, recorder, test or...

Remotely controlled inspection means

165 12, 165 26, 165 27, 307 64, 307 83, 236 46R, F25B 2900, H02J 906

Patent

active

051274647

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.

REFERENCES:
patent: 2871373 (1959-01-01), Malsbary et al.
patent: 3201592 (1965-08-01), Reinert et al.
patent: 3646355 (1972-02-01), Ireland et al.
patent: 4308991 (1982-01-01), Pienetti et al.
patent: 4725001 (1988-02-01), Carney et al.
patent: 4898229 (1990-02-01), Brown et al.
patent: 5029285 (1991-07-01), Bobry

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