Daikin VRV IV W+ Series Installer And User Reference Manual page 73

Connection with only VRV DX and RA DX indoor units
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
a
1
3
2
b
a Outdoor unit
b VRV DX indoor unit
c RA DX indoor unit
d Branch selector box (BP*)
(1) This connection is only allowed on a single outdoor unit installation.
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)
Longest pipe after the first branch (3+4, 3+5+6,
3+5+7)
Total pipe length (1+2+3+4+5+6+7+8+9)
Between branch selector box (BP*) and indoor unit:
Indoor unit capacity index
<60
60
71
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.
5
4 6
d
b
c
(1)
Pipe
18 Piping installation
|
7
d
c
Maximum length (actual/
equivalent)
100 m/120 m
40 m/—
250 m/—
Pipe length
2~15 m
2~12 m
2~8 m
Installer and user reference guide
73