Daikin VRV IV+ - Multiple Outdoor Units: Possible Layouts

18 | Piping installation
Installer and user reference guide
81
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
(b) In this case, both are actual piping lengths: outdoor units ≤20HP / outdoor units
>20HP.
Connection with VRV DX indoor units and air handling units
H3
1 2
H1
H2 H4
3
4
a
b
b
b
c
d
e
d
e
f
f
5
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d BS unit
e EKEXV kit
f 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)
135m/160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 500m/—
(a) If the equivalent piping length is more than 90m, size up the main liquid piping
according to "To select the piping size"[471].
18.1.8 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.