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Air handling system utilizing direct expansion cooling

  • US 5,101,639 A
  • Filed: 05/21/1990
  • Issued: 04/07/1992
  • Est. Priority Date: 05/21/1990
  • Status: Expired due to Term
First Claim
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1. A HVAC system which provides conditioned air to a space, comprising:

  • a compressor;

    a direct expansion coil having an air inlet and an air outlet, said direct expansion coil being connected to said compressor and adapted to receive a cooling agent from said compressor;

    a fan adapted to cause air flow into said air inlet;

    pressure sensing means positioned to measure pressure drop across said direct expansion coil, said pressure sensing means being adapted to produce a pressure sensor signal indicative of said pressure drop across said direct expansion coil;

    a programmable controller in communication with said pressure sensing means and said compressor, said programmable controller being adapted to receive said pressure difference signal and to disable said compressor when said pressure difference signal is greater than a predetermined high pressure limit;

    memory means connected to said controller, said memory means being adapted to store said predetermined high pressure levels; and

    airflow sensing means in communication with said programmable controller, said airflow sensing means being positioned to measure airflow through said direct expansion coil and adapted to produce an airflow signal indicative of airflow wherein said predetermined high pressure level varies with said airflow signal.

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