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4.2. Pipe selection
This unit is designed specifically for use with the R410A refrigerant. Pipes for R407C or
R22 may not be used with this unit. Do not use existing pipes. Improper pipe selection
will degrade performance.
Master
Slave
unit
unit 1
Outdoor unit branch kit (Optional)
Separation tube (Optional)
RB (single
RB
Pipe size
type)
(table D)
(Wall thickness and pipe material for each diameter)
Outside Diameter mm 6.35
9.52 12.70 15.88 19.05 22.22 28.58 34.92 41.27
Wall Thickness
mm
0.8
0.8
(
*3)
COPPER (
*1)
Material
JIS H3300 C1220T-O or equiva-
lent
*1: Allowable tensile stress ≥ 33 (N/mm²)
*2: Allowable tensile stress ≥ 61 (N/mm²)
*3: Endurance pressure of the pipes 4.2MPa
Please select the pipe size in accordance with local rules.
Table. A (Between outdoor unit and outdoor unit branch kit)
Outdoor
Outside diameter mm (in)
HP
unit cooling
Liquid pipe
capacity (kW)
8
22.4
12.70 (1/2")
10
28.0
12.70 (1/2")
12
33.5
12.70 (1/2")
14
40.0
12.70 (1/2")
16
45.0
12.70 (1/2")
For the installation method, refer to "5.5. Multiple connections".
Table. B (Between outdoor unit branch kits or outdoor unit branch kit and
first separation tube)
Total cooling ca-
pacity of outdoor
Liquid pipe
unit (kW)
22.4
12.70 (1/2")
22.5 to 28.0
12.70 (1/2")
28.1 to 33.5
12.70 (1/2")
33.6 to 45.0
12.70 (1/2")
45.1 to 56.0
15.88 (5/8")
56.1 to 78.5
15.88 (5/8")
78.6 to 96.0
19.05 (3/4")
96.1 to 102.4
19.05 (3/4")
102.5 or more
19.05 (3/4")
En-7
CAUTION
Slave
unit 2
Pipe size (table A)
Pipe size (table B)
Pipe size (table C)
RB (multi type)
Pipe size (table E)
Pipe size (table F)
0.8
1.0
1.2
1.0
1.0
COPPER (
*2)
JIS H3300 C1220T-H or
equivalent
Branch kit
Discharge
Suction Gas
Gas pipe
pipe
15.88 (5/8")
22.22 (7/8")
19.05 (3/4")
22.22 (7/8")
19.05 (3/4")
28.58 (1-1/8")
UTP-DX567A
22.22 (7/8")
28.58 (1-1/8")
22.22 (7/8")
28.58 (1-1/8")
Outside diameter mm (in)
Discharge Gas
Suction Gas pipe
pipe
15.88 (5/8")
22.22 (7/8")
19.05 (3/4")
22.22 (7/8")
19.05 (3/4")
28.58 (1-1/8")
22.22 (7/8")
28.58 (1-1/8")
22.22 (7/8")
28.58 (1-1/8")
28.58 (1-1/8")
34.92 (1-3/8")
28.58 (1-1/8")
34.92 (1-3/8")
28.58 (1-1/8")
41.27 (1-5/8")
34.92 (1-3/8")
41.27 (1-5/8")
Table. C (Between separation tubes or separation tube and RB unit)
Total cooling
capacity of indoor
unit (kW)
4.4 to 11.1
11.2 to 13.9
14.0 to 22.3
22.4 to 28.0
28.1 to 44.7
44.8 to 46.9
47.0 to 56.0
56.1 to 80.0
80.1 to 95.0
95.1 or more
* If the selected pipe diameter between separation tubes (based on table "C") becomes
larger than the pipe diameter between outdoor unit branch kit and the first separation
tube (based on table "B"), please select the pipe whose diameter is equal to the one
between outdoor unit branch kit and the first separation tube.
(If pipe diameter C > B, select pipe size from table B)
* Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
* Discharge gas pipe size selection: When indoor unit of cooling only type is connected, it
calculates with the value except capacity of cooling only type.
Table. D (Between separation tube and RB unit)
1.2
1.43
Model code
07, 09, 12, 14
18, 24, 30
36, 45, 54
60
72, 90
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
*4
Table. E (Between separation tubes or RB unit and separation tube)
Total cooling capacity
of indoor unit (kW)
4.4 to 11.1
11.2 to 13.9
14.0 to 19.6
19.7 to 28.0
28.1 to 44.7
44.8 to 56.0
56.1 to 80.0
80.1 to 95.0
95.1 or more
* If the selected pipe diameter based on table "E" becomes larger than the pipe diameter
based on table "C", please select the pipe whose diameter is equal to the table "C". Gas
pipe of table "E" should be compared with suction gas pipe of table "C."
(If pipe diameter E > C, select pipe size from table C)
* "Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
Table. F (Between separation tube and indoor unit or RB unit and indoor unit)
Model code
07, 09, 12, 14
18, 24, 30
36, 45, 54
60
72, 90
Outside diameter mm (in)
Discharge Gas
Liquid pipe
pipe
9.52 (3/8")
12.70 (1/2")
9.52 (3/8")
12.70 (1/2")
12.70 (1/2")
15.88 (5/8")
12.70 (1/2")
19.05 (3/4")
12.70 (1/2")
19.05 (3/4")
15.88 (5/8")
19.05 (3/4")
15.88 (5/8")
22.22 (7/8")
15.88 (5/8")
28.58 (1-1/8")
19.05 (3/4")
28.58 (1-1/8")
19.05 (3/4")
28.58 (1-1/8")
Outside diameter mm (in)
Cooling capacity of
indoor unit (kW)
Liquid pipe
2.2, 2.8, 3.6, 4.0, 4.5
6.35 (1/4")
5.6, 7.1, 8.0, 9.0
9.52 (3/8")
11.2, 12.5, 14.0
9.52 (3/8")
18.0
9.52 (3/8")
22.4, 25.0
12.70 (1/2")
Outside diameter mm (in)
Liquid pipe
Gas pipe
9.52 (3/8")
15.88 (5/8")
9.52 (3/8")
19.05 (3/4")
12.70 (1/2")
22.22 (7/8")
12.70 (1/2")
22.22 (7/8")
12.70 (1/2")
28.58 (1-1/8")
15.88 (5/8")
28.58 (1-1/8")
15.88 (5/8")
34.92 (1-3/8")
19.05 (3/4")
34.92 (1-3/8")
19.05 (3/4")
41.27 (1-5/8")
Outside diameter mm (in)
Cooling capacity of
indoor unit (kW)
Liquid pipe
2.2, 2.8, 3.6, 4.0, 4.5
6.35 (1/4")
5.6, 7.1, 8.0, 9.0
9.52 (3/8")
11.2, 12.5, 14.0
9.52 (3/8")
18.0
9.52 (3/8")
22.4, 25.0
12.70 (1/2")
Separation
tube
Suction Gas
for 3 pipes
pipe
15.88 (5/8")
19.05 (3/4")
UTP-BX090A
22.22 (7/8")
22.22 (7/8")
28.58 (1-1/8")
28.58 (1-1/8")
UTP-BX180A
28.58 (1-1/8")
34.92 (1-3/8")
34.92 (1-3/8")
UTP-BX567A
41.27 (1-5/8")
Discharge
Suction Gas
Gas pipe
pipe
9.52 (3/8")
12.70 (1/2")
12.70 (1/2")
15.88 (5/8")
12.70 (1/2")
19.05 (3/4")
15.88 (5/8")
19.05 (3/4")
19.05 (3/4")
22.22 (7/8")
Separation tube
for 2 pipes
UTP-AX054A
UTP-AX090A
UTP-AX180A
UTP-AX567A
Gas pipe
12.70 (1/2")
15.88 (5/8")
19.05 (3/4")
19.05 (3/4")
22.22 (7/8")
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