Daikin VRV IV+ Installer And User Reference Manual page 78

18 | Piping installation
Connection with VRV DX indoor units and air handling units
Installer and user reference guide
78
d LT Hydrobox unit
e HT Hydrobox unit
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
(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)
Maximum length (actual/equivalent)
4
"To select the piping size" [ 71].
5
1 2
c
d
e
f
b
Maximum length (actual/equivalent)
(a)
135 m/160 m
40 m
10 m/13 m
(b)
300 m/600 m
d
e
f
(a)
165 m/190 m
40 m/—
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10