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HVAC AIR FILTER MONITOR WITH SENSOR COMPENSATION

  • US 20120318073A1
  • Filed: 06/20/2011
  • Published: 12/20/2012
  • Est. Priority Date: 06/20/2011
  • Status: Active Grant
First Claim
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1. A method of monitoring a status of an air filter of an HVAC system, wherein the HVAC system has a fan for driving air through the air filter of the HVAC system, the method comprising:

  • a) turning the fan “

    off”

    so that substantially no air is driven through the air filter;

    b) with the fan “

    off”

    , measuring a sensor offset differential pressure value between an upstream side of the air filter and a downstream side of the air filter;

    c) storing the sensor offset differential value;

    d) turning the fan “

    on”

    so that air is driven through the air filter;

    e) with the fan “

    on”

    , measuring an un-compensated differential pressure value between the upstream side of the air filter and the downstream side of the air filter;

    f) determining a compensated differential pressure value by removing the sensor offset differential value from the un-compensated differential pressure value;

    g) determining the status of the air filter based, at least in part, on the compensated differential pressure value; and

    h) displaying the status of the air filter on a display of an HVAC controller.

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