5
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Preparation
Installer and user reference guide
40
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
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).
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
5.3.7 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
f
e
h
H1
BP1
6
i
j
g
b
d
A
B
7
k
l
BP2
5
4
3
2
1
H2
H6
Header
BP box
1~5
RA DX indoor units
Summary of Contents for VRV IV+
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