In 2 pipe systems without traps, what is the recommended "A" dimension for returning condensate to the boiler?

The recommended "A" dimension for returning condensate to the boiler in a two-pipe system without traps is 28 inches. This dimension is crucial because it helps ensure proper flow and pressure balance in the system, facilitating efficient condensate return and minimizing the risk of water hammer or improper drainage.

In a two-pipe system, maintaining an adequate height for the condensate return line is essential to create the sufficient gravitational force necessary for the condensate to return to the boiler. A dimension of 28 inches strikes a balance between allowing enough head pressure for effective flow and preventing issues that might arise from too great a height which could complicate the return process.

Understanding these parameters is important for steamfitters as they design and maintain heating systems to ensure optimal performance.