US PATENT SUBCLASS 165 / 250
.~.~.~.~ Outdoor air used in lieu of operating heating or cooling means (e.g., economy cycle, etc.)

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}
248  DF  .~.~ Flow of air from outdoors controlled (e.g., minimum outside air, etc.) {2}
249  DF  .~.~.~ Proportion of outdoor air and return air controlled {1}
250.~.~.~.~ Outdoor air used in lieu of operating heating or cooling means (e.g., economy cycle, etc.) {1}
251  DF  .~.~.~.~.~> Enthalpy sensor

DEFINITION

Classification: 165/250

Outdoor air used in lieu of operating heating or cooling means (e.g., economy cycle, etc.):

(under subclass 249) Subject matter further including a control means to allow the admittance of substantially one

hundred percent outdoor air to condition the area instead of operating a heating or cooling means of said heating and cooling system.