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Technique for fan cycling to maintain temperature within prescribed limits

  • US 4,718,021 A
  • Filed: 09/20/1985
  • Issued: 01/05/1988
  • Est. Priority Date: 09/20/1985
  • Status: Expired due to Fees
First Claim
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1. Method for maintaining the temperature of a served zone within prescribed limits with HVAC equipment of the type includng a supply fan which provides air into a set of cooling/heating coils or an air washer wherein a prescribed balance temperature is set;

  • the fan is operated in cycles of predetermined time span in which the fan is run part of the time and idle part of the time;

    the actual temperature in said served zone is sensed for a current cycle and delivered to a data processing unit; and

    the fan run time in each succeeding cycle during which said fan is operated is selectively controlled by said data processing unit in direct proportion to the difference between said actual temperature in the served zone for said current cycle and said prescribed balance temperature.

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