Abstract
The 2024 Uniform Mechanical Code (UMC) and Uniform Plumbing Code (UPC) define, for the first time, how an HVAC condensate trap is to perform. The codes give three choices for trap designs when more than one appliance is connected to a central drain line. For a single appliance drain line connecting to an approved final drain point the manufacturer of the AC equipment must furnish all details of the trap design and drain-line design/layout. If the manufacturer does not supply complete details, then the installation must adhere to the three choices given for multiple drain lines connecting to a common waste pipe.
