Daikin RYYQ8U7Y1B, Installer And User Manual

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17 | Piping installation
Installer and user reference guide
80
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
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
17.1.8 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
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
6,7 VRV DX indoor units
Maximum allowable length
▪ Between outdoor unit and indoor unit.
Actual piping length 100 m
Example:
a+b+g+l≤100 m
Equivalent length
(a)
120 m
Total piping length 250 m
Example:
a+b+d+g+l+k+c+e+f+h+i+j≤250 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).
▪ Between BP unit and indoor unit.
Indoor unit capacity index Pipe length
<60 2~15 m
60 2~12 m
71 2~8 m
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