US PATENT SUBCLASS 165 / 218
.~.~.~ Central temperature conditioned liquid supplied to each zone

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

200  DF  WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14}
201  DF  .~ Having heating and cooling capability {13}
205  DF  .~.~ Plural temperature regulators for plural zones {8}
218.~.~.~ Central temperature conditioned liquid supplied to each zone {1}
219  DF  .~.~.~.~> Separate supply and return mains (e.g., two pipe system, etc.) {1}

DEFINITION

Classification: 165/218

Central temperature condition liquid supplied to each zone:

(under subclass 205) Subject matter including a common liquid supply source capable of supplying heated or cooled liquid to each of said distinct areas.

SEE OR SEARCH CLASS

62, Refrigeration,

185, for control of indirect heat transfer liquid; subclass

201 for control of refrigeration producer by external cooled liquid or holdover; subclass 434 for refrigeration system having an intermediate fluid container and a flow line connected transfer fluid supply and heat exchanger; and subclass 435 for refrigeration system having an intermediate fluid container and an indirect fluid pump or agitator.

236, Automatic Temperature and Humidity Regulation,

34+, and 36+ for control of cooling or heating radiators.

237, Heating Systems, 2, for heating systems with automatic controls; subclasses 59+ for water circulation of heating system; and appropriate subclasses for a heat producer combined with means for distributing a fluid heated thereby, or for apparatus including systems for heating a room, chamber, house, or other inclosing structure when such apparatus is not equally adapted for cooking.