Daikin VRV IV - 18.1.8 Piping Length: VRV DX and RA DX

18 | Piping installation
Installer and user reference guide
78
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
Maximum allowable length
Between outdoor and indoor units.
Actual piping length 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
Equivalent length
(a)
160m
Total piping length 300m
Example 3:
▪ a+b+c+d+e+f+g+h+i≤300m
(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
18.1.8 Piping length: VRV DX and RA DX
For system containing VRVDX indoor units and RADX indoor units:
System setup
H5
H4
a
c
fe
h
H1
BP1 6
i
j
g
b d
A B
7
k
l
BP2
5
4
321
H2
H6
Header
BP box
1~5 RADX indoor units