Sensors and monitoring equipment can be embedded in the rooftop unit (RTU) controller to detect problems early and alert maintenance personnel. However, until now, technologies for online fault detection and diagnosis (FDD) have been expensive to apply, have not been tested in the field, and have not been able to handle multiple simultaneous faults.

Researchers from Purdue University and Field Diagnostic Services Inc. have now developed what they term a cost-effective, automated FDD technology that is sensitive to early signs of equipment malfunction and able to detect more than one problem at a time. The new system is designed to alert the equipment operator to potential problems and recommends priorities for scheduling maintenance. These capabilities enable FDD systems to cut energy costs, extend equipment life, and help provide a healthy, comfortable environment.