Piping Length: Vrv Dx And Ra Dx - Daikin VRV IV Installer And User Reference Manual

18 | Piping installation

18.1.8 Piping length: VRV DX and RA DX

Installer and user reference guide
78
Maximum allowable length
Between outdoor and indoor units.
Actual piping length
(a)
Equivalent length
Total piping length
(a)
Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for
calculation purposes of equivalent piping length, not for refrigerant charge calculations).
Maximum allowable height difference (on Hydrobox indoor unit)
H1 ≤50 m (40 m) (if outdoor is located below indoor units)
H2 ≤15 m
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit ≤40 m.
Example 1: unit 8: b+c+d+e+f+g+p≤40 m
Example 2: unit 6: b+h≤40 m, unit 8: i+k≤40 m
Example 3: unit 8: i≤40 m, unit 2: c≤40 m
For system containing VRV DX indoor units and RA DX indoor units:
System setup
a
H4
H5
H1
Header
BP box
1~5 RA DX indoor units
135 m
Example 1:
▪ a+b+c+d+e+f+g+p≤135 m
▪ a+b+c+d+k≤135 m
Example 2:
▪ a+i+k≤135 m
▪ a+b+e≤135 m
Example 3:
▪ a+i≤135 m
▪ a+d≤135 m
160 m
300 m
Example 3:
▪ a+b+c+d+e+f+g+h+i≤300 m
b
A B
c
e f
BP1 6
k
1 2 3
H2
4
d
g
7
BP2
H6
l
5
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10