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Piping installation
Installer and user reference guide
73
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Connection with only VRV DX and RA DX indoor units
2
3
1
4
6
H1
H2
H2
H6
H5
H2
H4
H6
b
a
b
c
d
d
c
5
7
a
Outdoor unit
b
VRV DX indoor unit
c
RA DX indoor unit
(1)
d
Branch selector box (BP*)
(1) This connection is only allowed on a single outdoor unit installation.
Pipe
Maximum length (actual/
equivalent)
Longest pipe from the outdoor unit or the last multi-
outdoor piping branch (1+2, 1+3+4, 1+3+5+6,
1+3+5+7)
100 m/120 m
Longest pipe after the first branch (3+4, 3+5+6,
3+5+7)
40 m/—
Total pipe length (1+2+3+4+5+6+7+8+9)
250 m/—
Between branch selector box (BP*) and indoor unit:
Indoor unit capacity index
Pipe length
<60
2~15 m
60
2~12 m
71
2~8 m
Remark: Minimum allowable length
between the outdoor unit and first
refrigerant branch kit must be larger than 5 m (e.g., a>5 m).
If the piping length between the first branch and branch selector box (BP*) or VRV
DX indoor unit is larger than 20 m, it is necessary to increase the gas and liquid
piping size between the first branch and branch selector box (BP*) or VRV DX
indoor unit. If the piping diameter of the sized up piping exceeds the diameter of
the piping before the first branch kit, then the latter also requires a liquid piping
and gas piping size up.