LG Multi V

ENGLISH
Installation Manual 31
Pipe connections between indoor and outdoor unit
u Y branch method
Refrigerant piping system
1 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Master
Master
Slave
Slave
Master
Slave
33ft
(10m)
or
less
l 131ft(40m) (295ft(90m) : Conditional application)
H 361ft(110m)
L492ft(150m) (656ft(200m) : Conditional application)
ODU Capacity
Master ≥ Slave
49ft(15m)
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:
ARCNN21
l 131ft(40m) (295ft(90m) : Conditional application)
H 361ft(110m)
49ft(15m)
L492ft(150m) (656ft(200m) : Conditional application)
Piping length from outdoor branch to outdoor unit ≤ 33ft(10m), equivalent length:max 43ft(13m) (for
12ton(14HP) or more)
Additional Application
To satisfy below condition to make 131ft(40m) ~ 295ft(90m) 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
Ø1/4(6.35mm)→Ø3/8(9.52mm)→Ø1/2(12.7mm)→Ø5/8(15.88mm)→Ø3/4(19.05mm)→Ø7/8(22.2mm)→Ø1(25.4)*,
Ø1-1/8(28.58mm)→Ø1-1/4(31.8mm)*,Ø1-3/8(34.9mm)→Ø1-1/2(38.1mm)*
* : It is not necessary to size up.
h If the step up size is not available, you can not select the next higher size available.
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 ≤ 3281ft(1000m)
3) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 131ft(40m)
4) [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]
- [Length of pipe from outdoor unit to the closest indoor unit 1 (A+a)] ≤ 131ft(40m)