5 Preparation
Installer and user reference guide
17
RWEYQ8~1 RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
Connection with VRV DX indoor units and Hydrobox units
a
4
H1
H2
H3
H2
H2
a
a
b
b
c
6
2
5
1
3
a
Outdoor unit
b
VRV DX indoor unit
c
LT Hydrobox unit
Pipe
Maximum length
(actual/equivalent)
Longest pipe from the outdoor unit or the
last multi-outdoor piping branch (1+2+6,
1+3, 1+2+5)
120 m/140 m
Longest pipe after the first branch (3, 2+6,
2+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 (1+2+3+4+5+6)
300 m/—
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
BP box
(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 BP unit 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 BP unit 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 BP unit 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.
In case of heat recovery mode
Connection with VRV DX indoor units and air handling units
a
H3
1
2
H1
H2
H4
3
4
b
b
b
c
d
e
d
e
f
f
5
a
H7
a
Outdoor unit
b
VRV DX indoor unit
c
Multi BS unit
d
BS unit
e
EKEXV kit
f
AHU