| 摘要 |
Damper means having rotatable closure means mounted in a housing placed in the flow stream of a heating/cooling medium to regulate and control the medium being transported through duct means of a heating/cooling device; said closure means being operated by motor means, said motor means and fuel control means of the heating/cooling device being energized by means of a coded signal of thermostatically operated generator/transmitter means, said signal being transmitted along existing wires of a structure to receiver means, said receiver means electrically connecting to said motor means and to fuel control means, demodulating said coded signal and operating said motor means and fuel control means.
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