18
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Piping installation
Installer and user reference guide
74
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
In case of heat recovery system
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
Branch selector unit (BS*)
d
Multi branch selector unit (BS*)
e
EKEXV kit
f
Air handling unit (AHU)
Pipe
Maximum length (actual/
equivalent)
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/—
(a) If the equivalent piping length is more than 90 m, size up the main liquid piping
according to
"18.1.3 To select the piping size"
.
