About The Piping Length - Daikin VRV 5 RXYA8A7Y1B Installer And User Manual

18 | Piping installation

18.1.7 About the piping length

Installer and user reference guide
96
Maximum number of indoor units connected to SV units
in refrigerant flow-through (c)
Make sure the piping installation does not exceed the maximum allowable pipe
length, the allowable level difference, and the allowable length after branching. To
illustrate the piping length requirements, 2 cases are discussed in the chapters
below. They describe both standard and non-standard outdoor unit combinations
with VRV DX indoor units.
Definitions
Term
Actual piping length
Equivalent piping length
Total actual piping length
Equivalent length of the piping accessories
Accessory
Refnet joint
Refnet header
SV unit branch pipe
Total downstream
indoor unit capacity
<150
150≤x<290
290≤x<392
392≤x<620
620≤x≤650
Example
a
SV1
b b
50 50 50
SV1 SV unit 1 (SV4A)
SV2 SV unit 2 (SV4A)
a 20 m
b 10 m
Description
Pipe length between outdoor and
indoor units
Pipe length between outdoor and
indoor units, including the equivalent
length of the piping accessories
Total piping length, from the outdoor to
all indoor units
Equivalent length of SV unit [m]
SV1A SV4A
0.15 0.15
0.4
0.87 0.87
3.42 3.42
3.42 3.42
c
SV2
b b d d
50 50 50
Model
SV1 SV4 SV6 SV8
Definition
Equivalent length [m]
0.5 m
1 m
6.7 m
SV6A
0.21
0.4 0.58
1.27
4.99
4.99
d d
50 50
RYMA5+RXYA8~20A7Y1B
64
SV8A
0.21
0.58
1.27
4.99
4.99
VRV 5 heat pump
4P749918-1 – 2023.12