DX system interior heat exchanger defrost design for heat to cool mode
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United States of America Patent
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Jul 15, 2014
Grant Date -
May 5, 2011
app pub date -
May 14, 2009
filing date -
May 14, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A DX heating/cooling system includes an automatic hot gas by-pass valve (1) for preventing frosting of an interior heat exchanger/air handler (6) when the system is switched from the heating mode to the cooling mode, and a specially sized TXV (7) by-pass line (12), where the automatic hot gas by-pass valve (1) is positioned to provide hot gas at two optional locations, with one location before the cool liquid enters the air handler (6), and with the other location after the warmed vapor refrigerant exits the air handler (6).
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