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Vapor line pressure control

  • US 6,092,378 A
  • Filed: 12/22/1997
  • Issued: 07/25/2000
  • Est. Priority Date: 12/22/1997
  • Status: Expired due to Term
First Claim
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1. In a heat pump system having a compressor, outdoor and indoor fans, outdoor and indoor coils interconnected by liquid and vapor lines, and a reversing valve operable to selectively direct refrigerant flow for either cooling or heating modes of operation, a control system for allowing the use of a replacement refrigerant having a substantially higher pressure than the refrigerant for which the system was designed, without replacement of the lines in the indoor coil or the vapor line, comprising:

  • means for sensing when the pressure in the vapor line exceeds a predetermined maximum threshold pressure limit for said vapor line during periods of operation in the heat pump mode; and

    means for responsively reducing the speed of the outdoor fan to thereby lower the pressure to an acceptable limit below said predetermined pressure limit.

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