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ZONE TEMPERATURE CONTROL SYSTEM

  • US 3,567,115 A
  • Filed: 05/19/1969
  • Issued: 03/02/1971
  • Est. Priority Date: 05/19/1969
  • Status: Expired due to Term
First Claim
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1. A system for controlling a physical condition in a plurality of zones, comprising:

  • a first source of medium capable of effecting a change in the condition;

    first circulating means for circulating the medium to the zones;

    condition sensing means in each zone for sensing the condition in that zone and providing two outputs in accordance with the deviation between the sensed condition and a desired condition in that zone, said outputs depending on a first deviation range and a second deviation range;

    flow control means for controlling the flow of medium to each zone in response to a first of said outputs of the sensing means in that zone whereby the flow of medium to each zone is controlled by said first output through said first range; and

    first source control means for controlling the source to vary the condition changing capability of the medium in response to the second of said outputs whereby said condition changing capability of said first source is controlled by said second output through said second range.

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