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Figure 6.11 Flare the end of the tube (D) Figure 6.12 Apply oil to the back of the flared pipe and the flare joint • Apply oil to the back of the flared pipe and the flare joint using oil compatible with the refrigerant before connecting pipes, i.e. use polyolester oil (POE) with R-410A refrigerant (Figure 6.12) – oil reduces the possibility of tearing the flare when the nut is tightened. Oil must not be allowed to contaminate the refrigerant. Figure 6.14 Connect the pipes (B) Figure 6.13 Connect the pipes (A) • Hand-fasten the flare nut to connect the pipes (Figures 6.13 and 6.14). Figure 6.15 Tighten connection (A) • Tighten the connection using two spanners to the torque recommended by the manufacturer (Figures 6.15 and 6.16) – use a torque spanner to achieve the correct torque. Torque against the second spanner (to secure the load while tightening). Never tighten the connection against the joint. Figure 6.16 Tighten connection (B) 30 Do not: • mix polyolester oil and mineral-based oil • use leak lock or PTFE tape – these are not plumbing joints.PDF Image | Heat pump installation Good Practice Guide
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