What is the minimum size of a condensate drainage line pipe for refrigeration units between 20 and 35 tons?

The minimum size of a condensate drainage line pipe for refrigeration units between 20 and 35 tons is indeed 1 inch. This sizing is based on the need to effectively remove the condensate produced by these units without causing backups or prolonging the discharge time.

Using a 1-inch pipe is generally adequate for handling the typical volume of condensate generated in this range of refrigeration systems, ensuring that the flow is maintained without restrictions.

Larger pipe sizes, such as 1.5 inches, 2 inches, or 3 inches, could be used in certain scenarios where larger volumes of condensate are expected, or in longer runs where larger diameters can offset possible friction losses. However, for standard installations with typical condensate volumes produced by refrigeration units within the specified tonnage, a 1-inch pipe is sufficient and complies with relevant plumbing codes.

This understanding highlights the importance of sizing drainage lines appropriately to ensure efficient operation within the specified parameters of HVAC systems.