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Zone system control

  • US 5,829,674 A
  • Filed: 09/15/1997
  • Issued: 11/03/1998
  • Est. Priority Date: 05/02/1997
  • Status: Expired due to Term
First Claim
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1. A control device for controlling an HVAC system, the HVAC system having an on cycle and an off cycle, at least two zones for conditioning the air in the least two enclosed spaces between a start temperature and a predetermined temperature, the control device comprising:

  • a control mechanism for each of the at least two zones operably connected to the HVAC system and capable of controlling the amount of conditioning to each zone between a fully open position and a fully closed position;

    a temperature sensor capable of perceiving the temperature in the enclosed space of the at least two zones and capable of providing a signal corresponding to the perceived temperature;

    a microprocessor operatively connected to receive the signals from the temperature sensors for comparing the perceived temperature to the predetermined temperature;

    the microprocessor operative to determine a demand for each of the at least two zones and a trajectory between the start temperature and the predetermined temperature for each of the at least two zones; and

    the microprocessor further operative to send a separate signal to each of the at least two control mechanisms corresponding to a position between fully opened and fully closed such that the temperature of each of the at least two zones follows the trajectory and such that each of the at least two zones reaches the predetermined temperature at about the same time.

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