US PATENT SUBCLASS 165 / 241
.~.~.~ Change-over from heat pump operation to supplemental heat source operation alone

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

DEFINITION

Classification: 165/241

Change-over from heat pump operation to supplemental heat source operation alone:

(under subclass 240) Subject matter including means to convert operation from said reversible refrigeration producer, with or without operation of said additional heat source, to operating in a mode wherein said additional heat source is used exclusively.