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6.1.5 Creating flared joints Flared joints are required where connecting the pipe to the units. Flared joints must be done by an experienced installer as the joints have a higher risk of the refrigerant leaking due to poor installation. They can also be easily modified by unqualified persons. Flaring of joints is not a simple task and requires the correct tool to be used for the refrigerant gas being used and the pipe wall thickness. The correct steps must be followed to create a sound connection. Units using R410A refrigerant require a specific flaring tool to cope with the pressure the refrigerant is installed at. There are several steps for forming a flared joint. Figure 6.5 Cut pipe with tube cutters • Cut pipe with tube cutters to give a cut that is straight across (Figure 6.5) – use a sharp blade and cut slightly longer than measured length. Figure 6.7 Place the flare nut over the pipe end • Remember to remove the flare nut from the unit and put it over the pipe end (Figure 6.7) – it is not possible to put it on after flaring the pipe. Figure 6.9 Flare the end of the tube (B) Figure 6.6 Remove all burrs • Remove all burrs with a de-burr tool (Figure 6.6). • Remove any metal filings that may have fallen into the pipe. Figure 6.8 Flare the end of the tube (A) • Flare the end of the tube using the correctly-sized flare tool and ensure that the correct amount of pipe protrudes (Figures 6.8 – 6.11). Figure 6.10 Flare the end of the tube (C) 29PDF Image | Heat pump installation Good Practice Guide
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