Multiple Outdoor Units: Possible Layouts - Daikin VRV IV+ Installer And User Reference Manual

Connection with VRV DX indoor units and air handling units

18.1.8 Multiple outdoor units: Possible layouts

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.
a
4
3
b
b
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d BS unit
e EKEXV kit
f AHU
Pipe
Longest pipe from the outdoor unit or
the last multi-outdoor piping branch
(1+2, 1+3, 1+5)
Longest pipe after the first branch (2, 3,
5)
In case of a multi-outdoor setup:
longest pipe from the outdoor unit to
the last multi-outdoor piping branch (4)
Total pipe length
(a) If the equivalent piping length is more than 90 m, size up the main liquid piping
according to
▪ The piping between the outdoor units must be routed level or slightly upward to
avoid the risk of oil retention into the piping.
5
1 2
c
d
e
f
b
Maximum length (actual/equivalent)
4
"To select the piping size" [ 71].
18 Piping installation
|
d
e
f
(a)
135 m/160 m
40 m/—
10 m/13 m
500 m/—
Installer and user reference guide
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