Rooftop package unit diagnostician
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United States of America Patent
Stats
-
Aug 17, 2004
Grant Date -
Jun 12, 2003
app pub date -
Dec 12, 2001
filing date -
Dec 12, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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.
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