Patent ID: 6354097
Filing Date: 2002-03-12
Classification: F25B,F25D,Y02B,Y10S

Abstract:
A heat pump system having a compressor, an outdoor fan and an indoor fan, an outdoor coil and an indoor coil interconnected by liquid and vapor lines, and a reversing valve operable selectively to direct refrigerant flow for either cooling or heating modes of operation, and a control system for allowing a replacement refrigerant having a substantially higher pressure than an original refrigerant for which the system was designed, without replacement of any lines in the indoor coil or the vapor line, said heat pump system comprising:temperature sensing means for sensing when a temperature in said vapor lines exceeds a predetermined temperature limit during periods of operation in said heating mode; and speed reducing means for responsively reducing a speed of said outdoor fan thereby to lower said temperature to an acceptable limit below said predetermined temperature limit.