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Method and apparatus for controlling air-conditioning systems

  • US 4,136,732 A
  • Filed: 04/19/1977
  • Issued: 01/30/1979
  • Est. Priority Date: 02/26/1976
  • Status: Expired due to Term
First Claim
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1. In an air conditioning system wherein heating and cooling means are employed to alter air temperature in a zone and a temperature responsive control system governs operation of the heating and cooling means, the zone temperature control system comprising:

  • (a) sensor means for sensing zone air temperature conditions;

    (b) command signal generator means connected to said sensor means for producing a command signal which is variable throughout first and second value ranges as a function of sensed temperature conditions;

    (c) controller means connected to said signal generator means for effecting operation of the heating and cooling means, said controller means responsive to command signal values in said first range to control operation of one of said heating and cooling means and responsive to command signal values in said second range to control the other of said heating and cooling means; and

    ,(d) command signal modifier means rendered effective between said first and second command signal value ranges to substantially prevent said command signal from changing value in response to changes in sensed zone temperature conditions between first and second predetermined temperature condition levels, said controller means maintained ineffective to operate either said heating means or said cooling means when zone temperature condition levels are between said first and second levels.

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