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7.3. Selection of piping size
Determine the proper size referring to following tables and reference
figure (only for indication).
B
B
x
A
a
C*
C
1
b
D
D
D
D
3
4
5
6
1
Multi Branch Selector unit
2
Single Branch Selector unit
3-11 VRV indoor units
a, b Refrigerant branch kits
x
Outdoor unit multi connection piping kits
7.3.1.
Piping between outdoor units and (first) refrigerant
branch kit: A, B
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Piping outer diameter size
Outdoor unit
Suction gas
capacity type
pipe
3/4 in.
RELQ 72 T type
(19.1 mm)
7/8 in.
RELQ 96 T type
(22.2 mm)
RELQ 120 T type
1-1/8 in.
RELQ 144 T type
(28.6 mm)
RELQ 192 T type
1-3/8 in.
RELQ 240 T type
(34.9 mm)
English
C
1
2
b
D
D
D
D
D
7
8
9
10
11
High/low
pressure gas
Liquid pipe
pipe
5/8 in.
(15.9 mm)
3/8 in.
(9.5 mm)
3/4 in.
(19.1 mm)
1/2 in.
7/8 in.
(12.7 mm)
(22.2 mm)
1-1/8 in.
5/8 in.
(28.6 mm)
(15.9 mm)
7.3.2. Piping between refrigerant branch kits, Branch Selec-
tor units or refrigerant branch kits and Branch Selector
units: C
Choose from the following table in accordance with the indoor unit
total capacity, connected downstream. Do not let the connection pip-
ing exceed the refrigerant piping size chosen by the general system
model name.
Piping outer diameter size
Indoor unit
Suction gas
capacity index
pipe
5/8 in.
< 54
(15.9 mm)
3/4 in.
54 ≤ × < 72
(19.1 mm)
7/8 in.
72 ≤ × < 111
(22.2 mm)
111 ≤ × < 162
1-1/8 in.
(28.6 mm)
162 ≤ × < 230
1-3/8 in.
230 ≤ × < 300
(34.9 mm)
1-5/8 in.
≥ 300
(41.3 mm)
Example:
Downstream capacity for C* = capacity index of (unit 3 + unit 4 + unit 5
+ unit 6 + unit 7 + unit 8 + unit 9)
7.3.3. Piping between refrigerant branch kits or Branch Selec-
tor units and indoor units: D
Pipe size for direct connection to indoor units must be the same as the
connection size of the VRV indoor units.
Piping outer diameter size
Indoor unit
capacity index
Gas pipe
05, 07, 09, 12,
1/2 in. (12.7 mm)
15, 18
24, 30, 36, 42,
5/8 in. (15.9 mm)
48, 54
72
3/4 in. (19.1 mm)
96
7/8 in. (22.2 mm)
High/low
pressure gas
Liquid pipe
pipe
1/2 in.
(12.7 mm)
5/8 in.
3/8 in.
(15.9 mm)
(9.5 mm)
3/4 in.
(19.1 mm)
1/2 in.
(12.7 mm)
5/8 in.
(15.9 mm)
1-1/8 in.
(28.6 mm)
3/4 in.
(19.1 mm)
Liquid pipe
1/4 in. (6.4 mm)
3/8 in. (9.5 mm)
10
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