What is the minimum pipe size required for multiple unit drains up to 125 tons?

The minimum pipe size required for multiple unit drains up to 125 tons is determined based on the maximum drainage load that these systems can impose. In HVAC applications, proper drainage is critical to prevent water backup and ensure that condensate from air conditioning units is effectively removed. For systems with a capacity of up to 125 tons, a pipe size of 1.5 inches is generally sufficient to handle the expected flow rates and maintain proper drainage. This diameter allows for adequate runoff, minimizing the risk of clogs and facilitating smooth operation of the HVAC system.

Choosing a larger pipe size, such as 2 inches or 2.5 inches, while it may further reduce the risk of drainage issues, is often unnecessary for loads of this magnitude and can increase material costs without yielding significant benefits. Conversely, sizing the pipe smaller than 1.5 inches could lead to drainage problems, as it may not handle the condensate load efficiently, resulting in potential system failures or water damage. Therefore, 1.5 inches is recognized as the optimal size for ensuring efficient and reliable operation in these HVAC systems.