The focus of the Residential Fault Detection and Diagnostics CASE Report is to provide credit for use of advanced technologies that detect when residential HVAC systems are installed and operated optimally. The Statewide Team is proposing a compliance credit that will be granted for installation of Fault Detection and Diagnostics devices that can identify over time when an HVAC system’s performance is not optimal (due to installation faults or faults that emerge over time), and alert the owners or service providers. Credit may be provided in a way similar to the refrigerant and airflow verification credit—Section 2.4 of the 2016 Title 24, Part 6 Residential Alternative Calculation Method Reference Manual describes credit given to systems for which the charge is verified as correct by establishing a “compressor efficiency multiplier,” which is used in calculations to degrade the efficiency of a compressor by a factor of ten percent when charge is not verified as correct, but only by four percent when it is verified as correct. In this case, an efficiency multiplier may be used to provide credit for installation and proper configuration of a Fault Detection and Diagnostics device or a Fault Detection and Diagnostics enabled HVAC system.
In this effort, the Statewide CASE Team is conducting field research to identify the appropriate efficiency multiplier for systems with and without an Fault Detection and Diagnostics device, and also providing performance-based specifications for manufacturer certification of Fault Detection and Diagnostics effectiveness and field verification of proper Fault Detection and Diagnostics installation.
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The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.
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