En-7
4.2. Pipe selection
CAUTION
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
unit
Slave
unit 1
Outdoor unit branch kit (Optional)
Separation tube (Optional)
RB (multi type)
RB
RB (single
type)
Pipe size
(table D)
Pipe size (table A)
Pipe size (table B)
Pipe size (table C)
Pipe size (table E)
Pipe size (table F)
Slave
unit 2
(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
(*3)
mm
0.8
0.8
0.8
1.0
1.2
1.0
1.0
1.2
1.43
Material
COPPER (*1)
JIS H3300 C1220T-O or equiva-
lent
COPPER (*2)
JIS H3300 C1220T-H or
equivalent
*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)
HP
Outdoor
unit cooling
capacity (kW)
Outside diameter mm (in)
Branch kit*4
Liquid pipe
Discharge
Gas pipe
Suction Gas
pipe
8
22.4
12.70 (1/2")
15.88 (5/8")
22.22 (7/8")
UTP-DX567A
10
28.0
12.70 (1/2")
19.05 (3/4")
22.22 (7/8")
12
33.5
12.70 (1/2")
19.05 (3/4")
28.58 (1-1/8")
14
40.0
12.70 (1/2")
22.22 (7/8")
28.58 (1-1/8")
16
45.0
12.70 (1/2")
22.22 (7/8")
28.58 (1-1/8")
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
unit (kW)
Outside diameter mm (in)
Liquid pipe
Discharge Gas
pipe
Suction Gas pipe
22.4
12.70 (1/2")
15.88 (5/8")
22.22 (7/8")
22.5 to 28.0
12.70 (1/2")
19.05 (3/4")
22.22 (7/8")
28.1 to 33.5
12.70 (1/2")
19.05 (3/4")
28.58 (1-1/8")
33.6 to 45.0
12.70 (1/2")
22.22 (7/8")
28.58 (1-1/8")
45.1 to 56.0
15.88 (5/8")
22.22 (7/8")
28.58 (1-1/8")
56.1 to 78.5
15.88 (5/8")
28.58 (1-1/8")
34.92 (1-3/8")
78.6 to 96.0
19.05 (3/4")
28.58 (1-1/8")
34.92 (1-3/8")
96.1 to 102.4
19.05 (3/4")
28.58 (1-1/8")
41.27 (1-5/8")
102.5 or more
19.05 (3/4")
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)
Outside diameter mm (in)
Separation
tube
Liquid pipe
Discharge Gas
pipe
Suction Gas
pipe
for 3 pipes
4.4 to 11.1
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
UTP-BX090A
11.2 to 13.9
9.52 (3/8")
12.70 (1/2")
19.05 (3/4")
14.0 to 22.3
12.70 (1/2")
15.88 (5/8")
22.22 (7/8")
22.4 to 28.0
12.70 (1/2")
19.05 (3/4")
22.22 (7/8")
28.1 to 44.7
12.70 (1/2")
19.05 (3/4")
28.58 (1-1/8")
UTP-BX180A
44.8 to 46.9
15.88 (5/8")
19.05 (3/4")
28.58 (1-1/8")
47.0 to 56.0
15.88 (5/8")
22.22 (7/8")
28.58 (1-1/8")
56.1 to 80.0
15.88 (5/8")
28.58 (1-1/8")
34.92 (1-3/8")
UTP-BX567A
80.1 to 95.0
19.05 (3/4")
28.58 (1-1/8")
34.92 (1-3/8")
95.1 or more
19.05 (3/4")
28.58 (1-1/8")
41.27 (1-5/8")
* 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)
Model code
Cooling capacity of
indoor unit (kW)
Outside diameter mm (in)
Liquid pipe
Discharge
Gas pipe
Suction Gas
pipe
07, 09, 12, 14
2.2, 2.8, 3.6, 4.0, 4.5
6.35 (1/4")
9.52 (3/8")
12.70 (1/2")
18, 24, 30
5.6, 7.1, 8.0, 9.0
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
36, 45, 54
11.2, 12.5, 14.0
9.52 (3/8")
12.70 (1/2")
19.05 (3/4")
60
18.0
9.52 (3/8")
15.88 (5/8")
19.05 (3/4")
72, 90
22.4, 25.0
12.70 (1/2")
19.05 (3/4")
22.22 (7/8")
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
Table. E (Between separation tubes or RB unit and separation tube)
Total cooling capacity
of indoor unit (kW)
Outside diameter mm (in)
Separation tube
Liquid pipe
Gas pipe
for 2 pipes
4.4 to 11.1
9.52 (3/8")
15.88 (5/8")
UTP-AX054A
11.2 to 13.9
9.52 (3/8")
19.05 (3/4")
14.0 to 19.6
12.70 (1/2")
22.22 (7/8")
19.7 to 28.0
12.70 (1/2")
22.22 (7/8")
UTP-AX090A
28.1 to 44.7
12.70 (1/2")
28.58 (1-1/8")
UTP-AX180A
44.8 to 56.0
15.88 (5/8")
28.58 (1-1/8")
56.1 to 80.0
15.88 (5/8")
34.92 (1-3/8")
UTP-AX567A
80.1 to 95.0
19.05 (3/4")
34.92 (1-3/8")
95.1 or more
19.05 (3/4")
41.27 (1-5/8")
* 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
Cooling capacity of
indoor unit (kW)
Outside diameter mm (in)
Liquid pipe
Gas pipe
07, 09, 12, 14
2.2, 2.8, 3.6, 4.0, 4.5
6.35 (1/4")
12.70 (1/2")
18, 24, 30
5.6, 7.1, 8.0, 9.0
9.52 (3/8")
15.88 (5/8")
36, 45, 54
11.2, 12.5, 14.0
9.52 (3/8")
19.05 (3/4")
60
18.0
9.52 (3/8")
19.05 (3/4")
72, 90
22.4, 25.0
12.70 (1/2")
22.22 (7/8")
9378945630-02_IM.indb 7
9378945630-02_IM.indb 7
3/6/2020 11:55:22 AM
3/6/2020 11:55:22 AM
