InstallationVI-2611 DVM PLUS III, DVM PLUS III HR1-7. Refrigerant piping works4) Pipe selectionDVM PLUS III HRMain pipe 1 size incrementMain pipe❇ Main pipe : from outdoor unit to the first branchjointEquivalent pipe length betweenoutdoor unit and the farthest indoor unitThe pipe length between outdoor and the farthest indoor unitbelow 90 m 90m and overø 9.52 ø 12.70ø 12.70 ø 15.88ø 15.88 ø 19.05ø 19.05 ø 22.23ø 22.23 ø 25.40ø 25.40 ø 28.58ø 28.58 ø 31.75ø 31.75 ø 38.10ø 38.10 ø 44.45ø 44.45 ø 50.80ElbowPipe size (O. D. mm) Equivalent length (m)ø 9.52 0.18ø 12.70 0.20ø 15.88 0.25ø 19.05 0.35ø 22.23 0.40ø 25.40 0.45ø 28.58 0.50ø 31.75 0.55ø 38.10 0.60ø 41.30 0.70ø 44.45 0.75ø 50.80 0.80Type Equivalent length (m)Y joint 0.5Header joint 1.0When the equivalent pipe length from outdoor unit to the farthest indoor unit is overthan 90m, the main pipe (both liquid and gas pipe) has to be increased with 1 size likebelow table.❈ Equivalent length calculation methodEquivalent length = actual pipe length(m) + number of 'Y-joint' X 0.5(m) + numberof 'Header joint' X 1.0(m) + number of elbows X equivalentlength of each elbowPipe size Thickness(mm) Material(O. D. mm)ø 6.35 0.7ø 9.52 0.7ø 12.70 0.8ø 15.88 0.8ø 19.05ø 22.23ø 25.40 1.0ø 28.58ø 31.75ø 38.10 1.35ø 44.45 1.6ø 50.80 2.0C1220T-1/2H(Half-hard)C1220T-O(Annealed)0.91.106_Installation(02~45) 3/15/08 4:34 Page 26