Piping Length: Vrv Dx Only - Daikin VRV IV Q+ Series Installer And User Reference Manual

18 | Piping installation

18.1.6 Piping length: VRV DX only

Installer and user reference guide
76
Term
H3
(a)
If the system capacity is >20 HP, re-read "the first outdoor branch as seen from the indoor
unit".
(b)
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).
For system only containing VRV DX indoor units:
System setup
Example
Example 1.1
a b c d
A B C D
h i j
1 2 3
Example 1.2
a
H1
c d
1 2
Example 1.3
a
b c d e
1 2 3 4
Example 2.1
r s
t
u
a b c d
A B C
h i j
1 2 3
Example 2.2
r
s
u a
c d
1 2
Difference in height between outdoor and outdoor
units.
e f g p
E F G
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
f g h
i
5 6 7
8
H2
e f g
H1
D E F G
p
k l m n
4 5 6 7
8
H2
H3
t
H1
A B
b
j k
7 8
H2
e f g h
3 4 5 6
Definition
Description
Single outdoor
Branch with refnet joint
H1
Single outdoor
Branch with refnet joint
and refnet header
Single outdoor
Branch with refnet header
Multi outdoor
Branch with refnet joint
Multi outdoor
Branch with refnet joint
and refnet header
VRV IV Q+ series heat pump
4P546229-1A – 2020.10
RXYQQ8~20U7Y1B