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Indoor air quality control for constant volume heating, ventilating and air conditioning units

  • US 5,597,354 A
  • Filed: 06/13/1995
  • Issued: 01/28/1997
  • Est. Priority Date: 06/13/1995
  • Status: Expired due to Fees
First Claim
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1. A system for circulating ventilating air in a space, the space including a supply air duct and a return air duct, the system comprising:

  • a supply air chamber configured for communication with the supply air duct;

    a return air chamber configured for communication with the return air duct;

    an outside air chamber configured to receive outside air from an outside air intake, the outside air chamber including an outside air damper having a plurality of settings for varying outside air flow volume in the outside air chamber, the outside air damper establishing a predetermined relationship between each outside air damper setting and the outside air flow volume, the outside air damper establishing each setting in response to a damper control signal;

    a mixed air plenum in communication with the return air chamber and the outside air chamber;

    a fan positioned between the mixed air plenum and the supply air chamber, the fan supplying a constant volume of air to the supply air chamber in response to a fan control signal; and

    a controller coupled to the outside air damper and the fan for providing the damper control signal and the fan control signal, the controller providing the damper control signal to establish a minimum outside air flow volume to the mixed air plenum, the controller including;

    an initialization input configured to receive an initialization signal, the initialization signal having one value of a plurality of values corresponding to an associated plurality of predetermined duct resistances, the one value corresponding to the minimum outside air flow volume; and

    a memory for storing data defining the predetermined relationship between each outside air damper setting and the outside air flow volume, the data being organized in sets, each respective set corresponding to a respective duct resistance, the controller selecting a set of data in response to the initialization signal, the controller being responsive to the selected set of data for providing the damper control signal.

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