En-11
4.6. 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.
• Refer to Fig. 4.6-1 for the proper pipe selection.
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)
COPPER
2)
JIS H3300 C1220T-O or equivalent
JIS H 3300 C1220T-H or equivalent
Table 4.6-1 Wall thickness and pipe material for each diameter
1) Allowable tensile stress
>
=
33 (N/mm
2
)
2) Allowable tensile stress
>
=
61 (N/mm
2
)
3) Design pressure 4.2 MPa
Liquid pipe
Gas pipe
8
AJ A72LBTF
12.70
22.22
AJ A72UBTF
UTR-CP567L
10
AJ A90LBTF
12.70
22.22
UTR-CP567X
AJ A90UBTF
14
AJ 126LBTF
12.70
28.58
UTR-CP567Q
AJ 126UBTF
Table 4.6-2 Between outdoor unit to outdoor unit branch kit
Outside diameter (mm)
Table 4.6-3 Between outdoor unit branch kits or outdoor unit branch kit to first separation tube
Total model code
of outdoor unit
Outside diameter (mm)
HP
Liquid pipe
Gas pipe
8, 10
12.70
22.22
14, 16
12.70
28.58
18, 20
15.88
28.58
22, 24, 26, 28
15.88
34.92
30, 32, 34
19.05
34.92
36, 38, 42
19.05
41.27
Table 4.6-4 Between separation tubes
Total model code
Outside diameter (mm)
of indoor unit
Liquid pipe
Gas pipe
Separation tube
5)
Header
5)
14 to 35
9.52
15.88
UTR-BP090L
UTR-H0908L
36 to 53
9.52
19.05
UTR-BP090X
UTR-H0906L
54 to 90
12.70
22.22
UTR-BP090Q
91 to 161
12.70
28.58
UTR-BP180L
UTR-H1808L
UTR-BP180X
UTR-H1806L
162 to 180
15.88
28.58
UTR-BP180Q
181 to 269
15.88
34.92
UTR-BP567L
—
270 to 323
19.05
34.92
UTR-BP567X
324 to 567
19.05
41.27
UTR-BP567Q
Table 4.6-5 Between separation tube to indoor unit
Model code
Outside diameter (mm)
of indoor unit
Liquid pipe
Gas pipe
7, 9, 12, 14
6.35
12.70
18, 20, 24, 25, 30
9.52
15.88
36, 45, 54, 60
9.52
19.05
90
12.70
22.22
Pipe size
(Table 4.6-6)
MASTER
Unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
SLAVE 1
Unit
SLAVE 2
Unit
Pipe size
(Table 4.6-2)
Pipe size
(Table 4.6-3)
Pipe size
(Table 4.6-4)
Pipe size
(Table 4.6-5)
HP
Outdoor unit model
Fig. 4.6-1
Table 4.6-6 Between outdoor units
Outside diameter (mm)
Oil equalization pipe
6.35
First separation
tube (optional)
Outdoor unit branch
kit (optional)
Separation tube
(optional)
Outdoor unit
4)
branch kit
• If the pipe diameter between separation tubes (based on table 4.6-4) becomes larger than the pipe diameter between outdoor unit
branch kit and the first separation tube (based on table 4.6-3), please select a pipe whose diameter is equal to the one between
outdoor unit branch kit and the first separation tube.
4)Refer to “4.7.6 MUL-
TIPLE CONNEC-
TIONS” or the Instal-
lation Instruction
Sheet of the outdoor
unit branch kit for the
connection methods.
5)Refer to “4.7.3 IN-
DOOR UNIT PIPE
CONNECTIONS” or
the Installation In-
struction Sheets of
the separation tube
and the header for the
connection methods.
9374241033_IM_en_p01-17.p65
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