US PATENT SUBCLASS 165 / 240
.~.~ Heat pump and supplemental heat source

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}
240.~.~ Heat pump and supplemental heat source {1}
241  DF  .~.~.~> Change-over from heat pump operation to supplemental heat source operation alone {1}

DEFINITION

Classification: 165/240

Heat pump and supplemental heat source:

(under subclass 201) Subject matter wherein said system is a reversible vapor-compression refrigeration producer in which

the heating effect of said refrigeration producer is augmented by an additional heat source.

SEE OR SEARCH CLASS

62, Refrigeration,

151, 56 for refrigeration system having defrosting means; subclass 160 for automatic control of refrigeration system of selective heating or cooling (reversible cycle-type); subclasses 238.6 and 238.7 for heat pump.

237, Heating Systems,

2, for automatic control of a heat pump.