Piping Length: Vrv Dx And Ra Dx - Daikin VRV IV+ RYYQ8U7Y1B Series Installer And User Manual

17 | Piping installation

17.1.8 Piping length: VRV DX and RA DX

Installer and user reference guide
80
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
6,7 VRV DX indoor units
Maximum allowable length
▪ Between outdoor unit and indoor unit.
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).
▪ Between BP unit and indoor unit.
Indoor unit capacity index
<60
60
71
Remark: Minimum allowable length between outdoor unit and first refrigerant
branch kit>5 m (the refrigerant noise from the outdoor unit can be transmitted).
Example: a>5 m
b
A B
c
e f
BP1 6
k
1 2 3
H2
4
100 m
Example:
a+b+g+l≤100 m
120 m
250 m
Example:
a+b+d+g+l+k+c+e+f+h+i+j≤250 m
d
g
7
BP2
H6
l
5
Pipe length
2~15 m
2~12 m
2~8 m
4P546228-1C – 2021.11
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump