Table 3 Total indoor unit capacity and pipe size
Total indoor unit capacity
(x)
Pipe size (Outside diameter)
Upstream
Downstream
Suction
High/low pressure
Liquid
Gas pipe
Liquid pipe
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
x < 54
f
5/8
f
15.9
f
1/2
f
12.7
f
3/8
f
9.5
f
5/8
f
15.9
f
3/8
f
9.5
54 ≤ x < 72
f
3/4
f
19.1
f
5/8
f
15.9
f
3/4
f
19.1
72 ≤ x < 111
f
7/8
f
22.2
f
3/4
f
19.1
f
7/8
f
22.2
111 ≤ x < 162
f
1-1/8
f
28.6
f
1/2
f
12.7
162 ≤ x < 230
f
1-1/8
f
28.6
f
5/8
f
15.9
230 ≤ x ≤ 290
f
1-3/8
f
34.9
f
3/4
f
19.1
•
In case of connection to the main pipe, refer to the installation manual included with the outdoor unit or
the equipment design materials.
Table 4 Indoor unit connection pipe size
Indoor unit capacity size
Pipe size (Outside diameter)
Gas pipe
Liquid pipe
in.
mm
in.
mm
07, 09, 12, 18
f
1/2
f
12.7
f
1/4
f
6.4
24, 30, 36, 42, 48, 54
f
5/8
f
15.9
f
3/8
f
9.5
72
f
3/4
f
19.1
96
f
7/8
f
22.2
•
Table 5 lists Branch Selector unit connection pipe size.
Table 5 Branch Selector unit connection pipe size
Outdoor unit side (*1)
Branch Selector unit
Suction pipe
High/low pressure gas pipe
Liquid pipe
in.
mm
in.
mm
in.
mm
BS4Q54TVJ
f
7/8
f
22.2
f
3/4
f
19.1
f
3/8
f
9.5
BS6Q54TVJ
f
1-1/8
f
28.6
f
1/2
f
12.7
BS8Q54TVJ
BS10Q54TVJ
f
1-1/8
f
28.6
f
5/8
f
15.9
BS12Q54TVJ
Indoor unit side (*2)
Branch Selector unit
Gas pipe
Liquid pipe
in.
mm
in.
mm
BS4Q54TVJ
f
1/2 (
f
5/8)
f
12.7 (
f
15.9)
f
1/4 (
f
3/8)
f
6.4 (
f
9.5)
BS6Q54TVJ
BS8Q54TVJ
BS10Q54TVJ
BS12Q54TVJ
*1 If the pipe size differs from that of the size selected from Table 3, you will need a reducing joint (to be
supplied in the field).
*2 The pipe diameter in parentheses can be used by cutting the pipes on the Branch Selector unit side
with a pipe cutter. For details, refer to “5-3 Piping connection.”
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