6 720 862 437 (2016/10)
RDCI Series – All DC Inverter Outdoor Units
10 | REFRIGERANT PIPE
Table.5-2
Pipe name
Code (As per
the Fig. 5-2)
Main pipe L1
Indoor unit main pipe L2~L13
Indoor unit aux. pipe a, b, ...r
Indoor unit main pipe branching pipe assembly A, B, C, D, E
Indoor unit aux. pipe branching pipe assembly I, II, III, IV
Outdoor unit branching pipe assembly L, M
Outdoor unit connective pipe g1, g2, g3, G1
SBOX equipment SB1, ...SB7
5.3 Size of joint pipes for indoor unit
Table.5-3 Size of joint pipes for R410A indoor unit
Capacity of
indoor unit A
(×100W)
Indoor unit main pipe (inches)
Low-pressure
gas side
High-pressure
gas side
Liquid
side
Available
branching pipe
A<56 Ø12.7 Ø9.5 Ø6.4 IDU-BJR01
56≤A<166 Ø19.1 Ø15.9 Ø9.5 IDU-BJR01
166≤A<230 Ø22.2 Ø19.1 Ø9.5 IDU-BJR02
230≤A<330 Ø22.2 Ø19.1 Ø12.7 IDU-BJR02
330≤A<460 Ø28.6 Ø22.2 Ø12.7 IDU-BJR03
460≤A<660 Ø28.6 Ø22.2 Ø15.9 IDU-BJR03
660≤A<920 Ø34.9 Ø28.6 Ø19.1 IDU-BJR04
920≤A<1350 Ø41.3 Ø34.9 Ø19.1 IDU-BJR05
1350≤A Ø44.5 Ø38.1 Ø22.2 IDU-BJR05
e.x.1: Refer to Fig.5-2, the capacity of downstream units to L2 is
71×2+140+28=310, i.e. low pressure gas pipe for L2 is Ø22.2, high
pressure gas pipe is Ø19.1, high pressure liquid pipe is Ø12.7.
5.4 Size of joint pipes for outdoor unit
Based on the following tables, select the diameters of outdoor unit main
connective pipe. When the main pipe accessory is larger on the indoor unit,
use the larger pipe accessory.
Table.5-4 Size of joint pipes for R410A outdoor unit
Model
When the equivalent length of all liquid
pipes < 90m, the size of main pipe (inches)
Low-pressure
gas side
High-pressure
gas side
Liquid
side
The 1st
branching pipe for
indoor unit
8HP Ø22.2 Ø19.1 Ø9.5
IDU-BJR02
10HP Ø22.2 Ø19.1 Ø12.7
IDU-BJR02
12HP Ø25.4 Ø19.1 Ø12.7
IDU-BJR03
14~16HP Ø28.6 Ø22.2 Ø15.9
IDU-BJR03
18~22HP Ø31.8 Ø28.6 Ø15.9
IDU-BJR03
24HP Ø34.9 Ø28.6 Ø15.9
IDU-BJR04
26~32HP Ø34.9 Ø28.6 Ø19.1
IDU-BJR04
34~48HP Ø41.3 Ø34.9 Ø19.1
IDU-BJR05
50~64HP Ø44.5 Ø38.1 Ø22.2
IDU-BJR05
Table.5-5 Size of joint pipes for outdoor unit (R410a)
Model
When the equivalent length of all liquid
pipes ≥ 90m, the size of main pipe (inches)
Low-pressure
gas side
High-pressure
gas side
Liquid
side
The 1st
branching pipe for
indoor unit
8HP Ø22.2 Ø19.1 Ø12.7
IDU-BJR02
10HP Ø22.2 Ø19.1 Ø12.7
IDU-BJR02
12HP Ø25.4 Ø19.1 Ø15.9
IDU-BJR03
14~16HP Ø28.6 Ø22.2 Ø15.9
IDU-BJR03
18~22HP Ø31.8 Ø28.6 Ø19.1
IDU-BJR03
24HP Ø34.9 Ø28.6 Ø19.1
IDU-BJR04
26~32HP Ø34.9 Ø28.6 Ø22.2
IDU-BJR04
34~48HP Ø41.3 Ø34.9 Ø22.2
IDU-BJR05
50~64HP Ø44.5 Ø38.1 Ø25.4
IDU-BJR05
5.5 Branch pipes for outdoor unit
Table.5-6
Model
Outdoor unit pipe connective opening dimension (inches)
Low-pressure gas
side
High-pressure gas
side
Liquid side
8~12HP Ø22.2 Ø19.1 Ø12.7
14, 16HP Ø28.6 Ø22.2 Ø15.9
5.6 Multi pipe connection assembly and pipe
diameter for outdoor unit
Based on Table 5-7 select the branch pipe assembly for the outdoor unit.
Before installation, please read the Outdoor Unit Branching Pipe Installation
Manual carefully.
Table.5-7 Outdoor unit branch pipe assembly (Illustration)
Outdoor
unit Qty.
Illustration
Outdoor unit
connective pipe
diameter
Parallel connect with
the branching pipes
2 units
L
g1g2
g1, g2:
8~12HP:
Ø22.2/Ø19.1/Ø12.7
14, 16HP:
Ø28.6/Ø22.2/Ø15.9
L:
ODU-BJR02
3 units
L
M
g1g2
G1
g3
g1, g2, g3:
8~12HP:
Ø22.2/Ø19.1/Ø12.7
14, 16HP:
Ø28.6/Ø22.2/Ø15.9
G1: Ø34.9/Ø28.6/
Ø19.1
L+M:
ODU-BJR03
4 units
L
M
N
g1g2
G1 G2
g3g4
g1, g2, g3, g4:
8~12HP:
Ø28.2/Ø19.1/Ø12.7
14, 16HP:
Ø28.6/Ø22.2/Ø15.9
G1: Ø34.9/Ø28.6/Ø19.1
G2: Ø41.3/Ø34.9/Ø22.2
L+M+N:
ODU-BJR04
5.7 Example
1) Take (10+12+16) HP for the three modules as an example to clarify the
pipe selection.
2) Take Fig.5-2 as an example, providing that the equivalent length of all
pipes in this system is larger than 90m.
Table.5-8
Capacity
of indoor unit A
(×100W)
Indoor unit aux. pipe (between branch joint and branch
joint/SB) (inches)
The branch pipe
assembly of indoor
unit aux. pipe
Gas side Liquid side
A<160 Ø15.9 Ø9.5 IDU-BJR01
Capacity
of indoor unit A
(×100W)
Indoor unit aux. pipe (between indoor unit and branch joint/SB) (inches)
When branching
pipe’s length ≤10m
When branching pipe’s length>10m
Gas side Liquid side Gas side Liquid side
A<56 Ø12.7 Ø6.4 Ø15.9 Ø9.5
160≥A≥56 Ø15.9 Ø9.5 Ø19.1 Ø12.7
Main pipe
Main pipe
Main pipe
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