18
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Piping installation
Installer and user reference guide
76
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Connection with only VRV DX indoor units
H3
1
5
H1
H2
3
2
4
a
b
b
c
d
b
b
a
Outdoor unit
b
VRV DX indoor unit
c
Multi branch selector unit (BS*)
d
Single branch selector unit (BS*)
Longest pipe
from the
outdoor unit
or the last
multi-
outdoor
piping
branch (1+2,
1+3, 1+5)
165 m/190 m
(a)
Longest pipe
after the
first branch
(2, 3, 5)
40 m/—
In case of a
multi-
outdoor
setup:
longest pipe
from the
outdoor unit
to the last
multi-
outdoor
piping
branch (4)
10 m/13 m
Total pipe
length
300 m/—
18.1.7 Multiple outdoor units: Possible layouts
▪
The piping between the outdoor units must be routed level or slightly upward to
avoid the risk of oil retention into the piping.