LG ARUN096BT2 Installation Manual - Page 26

3 Outdoor Units Example : 5 Indoor Units connected : Outdoor Unit : 1st branch (Y branch) : Indoor Units : Downward Indoor Unit : Connection branch pipe between Outdoor units: ARCNN30 : Connection branch pipe between Outdoor units: ARCNN20 10m (32.8ft) or less Slave2 Slave1 Master L150m(492ft) (200m(656ft) : Conditional application) l 40m(131ft) (90m(295ft) : Conditional application) 100m(328ft) 15m(49ft) Piping length from outdoor branch to outdoor unit ≤10m(32.8ft), equivalent length:max 13m(42.7ft) (for 18HP or more) Conditional Application To satisfy below condition to make 40 m ~ 90 m(131 ft ~295 ft) of pipe length after first branch. 1) Diameter of pipes between first branch and the last branch should be increased by one step, except pipe diameter B,C,D is same as Diameter A Ø6.35(1/4 inch) ¡ Ø 9.52(3/8 inch) ¡ Ø 12.7(1/2 inch) ¡ Ø 15.88(5/8 inch) ¡ Ø 19.05(3/4 inch) ¡ Ø 22.2(7/8 inch) ¡ Ø 25.4*(1* inch), Ø 28.58(1-1/8 inch) ¡ Ø 31.8*(1-1/4* inch), Ø 34.9(1-3/8 inch) ¡ Ø 38.1*(1-1/2* inch) * : It is not necessary to size up. 2) While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated twice. A+Bx2+Cx2+Dx2+a+b+c+d+e ≤ 1,000 m(3,281 ft) 3) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40m(131ft) 4) [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)] - [Length of pipe outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40m(131ft) 26 Outdoor Unit