Combination furnace--heat pump unit Patent #: 3996998
ApplicationNo. 05/853361 filed on 11/21/1977
US Classes:165/242, Responsive to outdoor temperature62/160Reversible cycle machine
ExaminersPrimary: Wayner, William E.
Attorney, Agent or Firm
International ClassesF24D 19/00 (20060101)
F24D 19/10 (20060101)
F24D 11/00 (20060101)
F24D 11/02 (20060101)
F25B 13/00 (20060101)
F25B 30/00 (20060101)
F25B 30/02 (20060101)
AbstractApparatus are disclosed for conditioning the air within an indoor space and include first heat transfer means for selectively heating air passing to the space and a heat pump selectively operable in a heating mode, also for heating air passing to the indoor space. Control means are provided for effecting operation of the first heat transfer means and the heat pump which include means for sensing the demand for heat within the indoor space and for distinguishing between a relatively low demand and a relatively high demand. Operation of the heat pump is effected in response to a relatively low demand for heat until such demand is satisfied. In the event that a relatively high demand for heat is sensed, operation of the heat pump is terminated and the first heat transfer means is operated until such time as both the relatively high and low demands for heat are satisfied. In the event that outdoor ambient temperature drops below a predetermined level, means are provided for preventing operation of the heat pump and for effecting operation of the first heat transfer means in response to the relatively low demand for heat.