Refrigerant Piping Installation; Precautions On Pipe Connection / Valve Operation; Connection Of Outdoor Units; Caution - LG MULTI V 5 ARUM160LTE5 Installation Manual

REFRIGERANT PIPING
INSTALLATION
For Heat Pump System Installation

Precautions on Pipe connection / Valve operation

Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare
connection for the indoor unit, and welding connection for the outdoor
pipe and the branching parts.
- Use hexagonal wrench to open/close the valve.
h In case of the heat pump system installation, be sure to maintain to
close no use pipe like below picture.
h Refer to the accessory installation manual provided.
Liquid pipe
No Use
(Weld with supplied
accessory pipe cap)
Gas pipe
WARNING
!
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas
leakage after the work.

CAUTION

!
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
Service Port

Connection of Outdoor units

When installing ODU series, refer below picture.
A B
(Master) (Slave1)
A≥B≥C≥D (Capability)
① IDU side connection pipe
② ODU to ODU connection pipe (1st branch)
③ ODU to ODU connection pipe (2st branch)
④ ODU to ODU connection pipe (3rd brach)
2, 3, 4 Outdoor Units
Outdoor units Model
C
I.D.19.05
C ARCNN21
2 Unit
C
C
O.D.19.05
C
3 Unit ARCNN31
I.D.22.2
C
I.D.28.58 O.D.22.2
ARCNN41
A
4 Unit
I.D.22.2
C
I.D.31.8
For more information, refer accessory installation manual.
Y branch
A
To outdoor unit
A
B To branch piping or indoor unit
C D
(Slave2) (Slave3)
Liquid Pipe Gas Pipe
O.D.15.88 I.D. 19.05
I.D.22.2 O.D. 28.58 I.D.34.9
331
416
314
408
I.D.15.88 I.D.15.88
I.D.28.58 I.D.28.58
I.D.12.7 I.D.9.52 83
I.D.22.2
I.D.31.8 I.D.34.9
I.D.22.2 O.D.19.05
I.D.41.3 I.D.38.1 O.D.34.9
I.D.12.7 I.D.15.88
I.D.28.58
O.D.12.7 I.D.9.52
70
130
I.D.22.2 O.D.28.58
O.D.15.88 I.D. 19.05
I.D.41.3 O.D.34.9
O.D.34.9 I.D.28.58
I.D.12.7
O.D.19.05 I.D.22.2
I.D.15.88
125
334 341
281 298
I.D.19.05 83 I.D.41.3 I.D.34.9
I.D.19.05
I.D.15.88 I.D.12.7
I.D.28.58
I.D.53.98 I.D. 44.5 O.D.41.3
O.D.15.88 I.D.19.05
I.D.22.2 O.D.28.58
O.D.19.05 I.D.22.2 I.D.28.58
O.D.41.3 I.D.44.5 I.D.53.98
334
415
281
375
I.D.19.05 83
I.D.19.05
I.D.41.3
I.D.44.48 I.D.53.98
I.D.15.88 I.D.12.7
I.D.28.58 O.D.22.2
I.D.28.58
O.D.15.88 I.D.19.05 I.D.22.2 O.D.28.58 I.D.34.9
Within +/- 10
B
Viewed from point A
in direction of arrow
13
111
I.D.34.9
111
I.D.34.9
134