Preparation Work; Pipe Drawing Out During Single / Series Connection; Refrigerant Piping System - LG MULTI V IV ARUB080BTE4 Installation Manual

Preparation Work

- Use Knock Outs of Base Pan of the outdoor unit for Left/Right or
Bottom pipe drawing outs.
Removal Area for Liquid/Gas pipe
bottom side connections.
! CAUTION
• Do not give damage to the pipe/base during the Knock Out
work.
• Proceed to pipe work after removing burr after Knock Out work.
• Perform sleeve work to prevent damage to the wire when con-
necting wires using knock Outs.
Remove leakage prevention cap
• Remove the leakage prevention cap attached to the outdoor unit
service valve before pipe work.
• Proceed the leakage prevention cap removal as follows:
- Verify whether the liquid/gas pipes are locked.
- Extract remaining refrigerant or air inside using the service port.
- Remove the leakage prevention cap
Liquid pipe
Low Pressure Gas pipe
High Pressure Gas pipe
Leakage Prevention Cap

Pipe Drawing Out during Single / Series connection

Method of drawing out pipes on the front side
- Proceed with the pipe work as shown in the below figure for front
side pipe drawing out.
Pipe Knock Out for
Liquid/Gas pipes
Pipe Knock Out
for High Pressure
Gas pipe
Service Port
Refrigerant Charging Port
Method of drawing out pipes on the bottom side
- Drawing out common pipe through side panel
Low Pressure Gas pipe
Liquid pipe
Remove pipe knock out

Refrigerant piping system

3 Outdoor Units
Example : 12 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : Y branch
Ⓒ : Indoor Unit
Ⓓ : Connection branch pipe between Outdoor units : ARCNB21
Ⓔ : Connection branch pipe between Outdoor units : ARCNB31
Ⓕ : Connection branch pipe between Outdoor units : ARCNB41
Ⓖ : Header
Ⓗ : HR Unit
Slave 3
A4
Slave 2
A3
Slave 1
A2
F3
F2
D
F1
E
A
F
1
C
a
C
2
b
B
C1
H1
c
H
C
3
"a"
d
C2
h
H2
C
4
f
e
6 C
5 C
- Case 1 ("a") : Maximum height is 15m if you install with Y branch.
- Case 2 ("b") : Maximum height is 5m in serial connection of HR units.
Conditional
To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
1) Diameter of pipes between first branch and the last branch should be in-
creased by one step, except pipe diameter B,C3 is same as Diameter A
Ø6.35 ' Ø 9.52 ' Ø 12.7 ' Ø 15.88 ' Ø 19.05 ' Ø 22.2 ' Ø 25.4*, Ø 28.58 '
Ø 31.8*, Ø 34.9 ' Ø 38.1*
* : It is not necessary to size up.
2) While calculating whole refrigerant pipe length, pipe B,C3 length should
be calculated twice.
A + B x 2 + C3 x 2 + C1 + C2 + a + b + c + d + e + f + g + i + j + k + l + m + n ≤ 1,000 m
3) Length of pipe from each indoor unit to the HR Unit
(a,b,c,d,e,f,g,i,j,k,l,m,n) ≤ 40 m
4) [Length of pipe from outdoor unit to the farthest indoor unit D12 (A+B+C+D+e)]
- [Length of pipe outdoor unit to the closest indoor unit D1(C1+a)] ≤ 40 m
High Pressure
Gas pipe
Master
A1
ODU Capacity
Master ≥ Slave1 ≥ Slave 2
B1
B2
C3
H3
g
i "b"
H4
C 7
k
j
G
sealing
x
C
8
l m n
9 C 10 C 11 C
15
*
12 C