Daikin RYYQ8U7Y1B, Installer And User Manual

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17 | Piping installation
Installer and user reference guide
79
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
17.1.7 Piping length: VRV DX and Hydrobox
For system containing VRV DX indoor units and Hydrobox:
System setup
Example Description
Example 1
a
A
h i j k l m n
B C D E F G
p
b c d e f
1 2 3 4 5 6 7
8
g
H1
H2
Branch with refnet joint
Example 2
a
b
c d e f
i
k
j
g h
A B
1 2 3 4 5 6
7 8
H1
H2
Branch with refnet joint
and refnet header
Example 3
a
c b d e f i g h
1 2 3 4 5 6 7
8
H1
H2
Branch with refnet header
1~7 VRV DX indoor units
8 Hydrobox unit (HXY080/125)
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