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Rooftop Diagnostician

Pacific Northwest National Laboratory

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The diagnostician is a self-contained unit that can be installed in any rooftop package unit.
The diagnostician is a self-contained unit that can be installed in any rooftop package unit.

Once powered up, results are available and can be viewed at the device's web site.
Once powered up, results are available and can be viewed at the device's web site.

Technology Marketing Summary

The Rooftop Diagnostician provides fast and effective diagnostics for heating, ventilation and air conditioning units in commercial buildings, allowing you to better monitor the HVAC system to provide optimal performance.

Description

The Rooftop Diagnostician attaches directly onto the HVAC unit and provides real-time web-based performance information. It allows you to remotely monitor the functionality of a rooftop unit in order to easily and cost-effectively evaluate performance. Developed at PNNL, this tool allows you to determine the cause of a malfunction in a rooftop unit or to monitor performance in order to optimize regularly scheduled maintenance.

Benefits
  • Supports heat pumps and dual fuel systems
  • Detects low fresh air supply to prevent “sick” buildings
  • Features a web-enabled display so no special software is needed
  • Detects high energy use and control failures
  • Provides real-time information that permits service analysis
  • Collects performance data for up to 5 years
Applications and Industries
  • Commercial HVAC
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 6,778,945
Patent
6,778,945
Rooftop package unit 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.
Pacific Northwest National Laboratory 08/17/2004
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
13145ProductionAvailable04/19/201007/02/2010

Contact PNNL About This Technology

To: Jennifer Hodas<jennifer.hodas@pnnl.gov>