Rooftop package unit diagnostician
US6778945B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2001 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Aug 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/37008
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.