What method do manufacturers recommend for attaching line sets to the air handling unit (AHU)?

Manufacturers typically recommend utilizing brazing alloy for attaching line sets to the air handling unit (AHU) because this method creates a strong and reliable permanent joint. Brazing involves melting a filler metal that has a higher melting point than solder but lower than that of the base materials being joined. This process forms a robust bond that can withstand the pressures and temperatures associated with refrigerant line operation, ensuring both mechanical integrity and leak-proof connections.

Using brazing is also beneficial because it is a common practice in the HVAC industry for copper lines, which are often used for refrigerant transport in heat pump systems. Proper brazing techniques ensure that the connections are durable and can handle the thermal expansion and contraction that occurs during the operation of the heat pump.

In contrast, other options like screws and anchors, PVC pipe clamps, and adhesive tape may not provide the necessary strength and leak-proof characteristics required for refrigerant lines, making them less suitable for this critical application.