Piping Length: Vrv Dx Only - Daikin VRV IV+ RXYTQ8U5YF Installer And User Manual

17.1.6 Piping length: VRV DX only

RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
Definitions
Term
Actual piping length
Equivalent piping length
Total piping length
H1
H2
H3
(a)
If the system capacity is >16 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 k
1 2 3
Example 1.2
a
H1
c d
1 2
Example 1.3
a
b c d e
1 2 3 4
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.
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
H1
f g h
i
5 6 7
8
H2
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
Single outdoor
Branch with refnet header
Installer and user reference guide
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