F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
237/21
F25B 13/00 (2006.01) F24D 11/02 (2006.01) F25B 49/02 (2006.01) F25D 21/00 (2006.01)
Patent
CA 1090307
C O N T R O L F O R A C O M B I N A T I O N F U R N A C E A N D H E A T P U M P S Y S T E M ABSTRACT OF THE DISCLOSURE A control circuit for a combination furnace and heat pump wherein a temperature dependent relay is connected to a thermostat such that the heat pump is operated to supply heat to an enclosure when the outdoor temperature is above a predetermined level and the furnace is operated to supply heat to the enclosure when the outdoor temperature is below a predetermined level. To defrost the outdoor coil of the heat pump the furnace is operated to supply heat to the indoor coil of the heat pump and a reversing valve relay is energized whereby the heat pump is operated in a reverse direction to supply heat to the outdoor coil for defrost.
314596
Cann Peter L.
Honnold Fred V.
Karns Phil
Carrier Corporation
Gowling Lafleur Henderson Llp
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