Refrigerant Piping System - LG ARUN115DT2 Installation Manual

Refrigerant piping system

N Y branch method
1 Outdoor Units
Example : 5 Indoor Units connected
: Outdoor Unit
: 1st branch (Y branch)
: Indoor Units
2 Outdoor Units
Example : 5 Indoor Units connected
: Outdoor Unit
: 1st branch (Y branch)
: Indoor Units
: Downward Indoor Unit
: Connection branch pipe
between Outdoor units:
ARCNN20
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)
Refrigerant piping installation
L150m(492ft) (200m(656ft) : Conditional application)
l 40m(131ft) (90m(295ft) : Conditional application)
15m(49ft)
Slave
Master
10m
(32.8ft)
or
less
L150m(492ft) (200m(656ft) : Conditional application)
l 40m(131ft) (90m(295ft) : Conditional application)
15m(49ft)
Installation Manual 27