Piping Length: Vrv Dx And Hydrobox - Daikin VRV IV+ RYYQ14U7Y1B Series Installer And User Manual

18 | Piping installation

18.1.7 Piping length: VRV DX and Hydrobox

Installer and user reference guide
80
For system containing VRV DX indoor units and Hydrobox:
System setup
Example
Example 1
a b c d
A B C
h i j
1 2 3
Example 2
a
H1
c d
1 2
Example 3
a
b c d
1 2 3
1~7 VRV DX indoor units
8 Hydrobox unit (HXY080/125)
Maximum allowable length
Between outdoor and indoor units.
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).
Maximum allowable height difference (on Hydrobox indoor unit)
H1 ≤50 m (40 m) (if outdoor is located below indoor units)
H2 ≤15 m
e f g
H1
D E F G
p
k l m n
4 5 6 7
8
H2
i
A B
k
b
j
7 8
H2
e f g h
3 4 5 6
H1
e f g h i
4 5 6 7
8
H2
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
160 m
300 m
Example 3:
▪ a+b+c+d+e+f+g+h+i≤300 m
Description
Branch with refnet joint
Branch with refnet joint
and refnet header
Branch with refnet header
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1B – 2020.10