About The Piping Length; Piping Length: Vrv Dx Only - Daikin VRV IV+ RYYQ8U7Y1B Series Installer And User Manual

17.1.5 About the piping length

17.1.6 Piping length: VRV DX only

RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
Make sure to perform the piping installation within the range of the maximum
allowable pipe length, allowable level difference and allowable length after
branching as indicated below. Three patterns will be discussed, including VRV DX
indoor units combined with Hydrobox units or RA DX indoor units.
Definitions
Term
Actual piping length
Equivalent piping length
Total piping length
H1
H2
H3
H4
H5
H6
(a)
If the system capacity is a multi outdoor installation, 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 k
1 2 3
Example 1.2
a
H1
c d
1 2
Pipe length between outdoor
(b)
Pipe length between outdoor
Total piping length from the outdoor
units.
Difference in height between outdoor and indoor
units.
Difference in height between indoor and indoor
units.
Difference in height between outdoor and outdoor
units.
Difference in height between outdoor and BP unit.
Difference in height between BP unit and BP unit.
Difference in height between BP unit and RA DX
indoor unit.
e f g p
H1
E F G
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
17 Piping installation
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Definition
(a)
and indoor units.
(a)
and indoor units.
(a)
to all indoor
Description
Single outdoor
Branch with refnet joint
Single outdoor
Branch with refnet joint
and refnet header
Installer and user reference guide
75