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Rooftop package unit diagnostician

United States Patent

August 17, 2004
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
Rooftop Diagnostician
A diagnostic system for an HVAC system includes a number of sensors used to measure the operation of the HVAC system. Sensor readings are measured by timing the delay between when a strobe signal is sent to a sensor and when an interrupt signal from the sensor is received. A device driver used to measure the sensor readings stores the sensor readings in pseudo-character device files, which are universally accessible by different subsystems of the diagnostic system. Based on the readings from these sensors, this diagnostic system is able to determine the operational status of the HVAC system and if an economizer in the HVAC system is operating properly.
Chassin; David P. (Pasco, WA), Pratt; Robert G. (Kennewick, WA), Reid; Larry Dean (Benton City, WA)
Battelle Memorial Institute (Richland, WA)
10/ 020,849
December 12, 2001
GOVERNMENT RIGHTS This invention was made with Government support under Contract Number DE-AC0676RLO1830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.