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English
7.3. Selection of piping size
Determine the proper size referring to following tables and reference
figure (only for indication).
A
B
B
C
C
D
D
x
b
a
1
2
3
4
b
1-4
VRV indoor unit
a, b Refrigerant branching kit
x
Outdoor unit multi connection piping kit
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.
Outdoor unit capacity
type
Piping outer diameter size
Gas pipe
Liquid pipe
RXLQ 72 T type
3/4 in. (19.1 mm)
3/8 in. (9.5 mm)
RXLQ 96 T type
7/8 in. (22.2 mm)
RXLQ 120, 144 T type
1-1/8 in. (28.6 mm)
1/2 in. (12.7 mm)
RXLQ 192 T type
5/8 in. (15.9 mm)
RXLQ 240 T type
1-3/8 in. (34.9 mm)
7.3.2. Piping between refrigerant branch kits: C
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the connec
-
tion piping exceed the refrigerant piping size chosen by the general
system model name.
Indoor unit
capacity index
Piping outer diameter size
Gas pipe
Liquid pipe
< 54
5/8 in. (15.9 mm)
3/8 in. (9.5 mm)
54 ≤
×
< 72
3/4 in. (19.1 mm)
72 ≤
×
< 111
7/8 in. (22.2 mm)
111 ≤
×
< 162
1-1/8 in. (28.6 mm)
1/2 in. (12.7 mm)
162 ≤
×
< 230
5/8 in. (15.9 mm)
230 ≤
×
< 300
1-3/8 in. (34.9 mm)
3/4 in. (19.1 mm)
> 300
1-5/8 in. (41.3 mm)
Example:
Downstream capacity for C = capacity index of unit 1 + capacity index
of unit 2
7.3.3. Piping between refrigerant branch kit and indoor unit: D
Pipe size for direct connection to indoor unit must be the same as the
connection size of the VRV indoor unit.
Indoor unit
capacity index
Piping outer diameter size
Gas pipe
Liquid pipe
05, 07, 09, 12, 18
1/2 in. (12.7 mm)
1/4 in. (6.4 mm)
24, 30, 36, 48, 54
5/8 in. (15.9 mm)
3/8 in. (9.5 mm)
72
3/4 in. (19.1 mm)
96
7/8 in. (22.2 mm)
•
When the equivalent pipe length between outdoor and indoor units
is 295 ft. (90 m) or more, the size of the main pipes (both gas side
and liquid side) must be increased. Depending on the length of the
piping, the capacity may drop, but even in such a case it is possible
to increase the size of the main pipes.
•
Even as the length of the piping is less than 295 ft. (90 m), it is able
to increase the diameter of piping to improve performance.
1
5
2
3
4
1
Outdoor unit
2
Main pipes (outdoor unit to first refrigerant branch kit)
3 Increase
4 First refrigerant branch kit
5 Indoor unit
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01_EN_03_3P734038-3.indd 9
2023/05/29 15:38:55
2023/05/29 15:38:55