US PATENT SUBCLASS 237 / 2 B
.~ Heat source is a reverse cycle refrigerating system or heat pump

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

2 R  DF  AUTOMATIC CONTROL {9}
2 B.~ Heat source is a reverse cycle refrigerating system or heat pump

Unofficial Alpha Subclasses: R A B

DEFINITION

Classification: 237/2

(under the class definition) Heating systems with means for regulating temperature and pressure independent of manual control.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, for automatic controllers when the structure of the apparatus for heating is not specifically defined.