Refrigerant Piping Length And Height Difference - Daikin VRV 5-S User Reference Manual

18 | Piping installation

18.1.7 Refrigerant piping length and height difference

Installer and user reference guide
92
Maximum capacity index of connectable indoor units
per SV unit (a)
Maximum capacity index of connectable indoor units
per branch (b)
Maximum capacity index of connectable indoor units
per branch if two branches are combined (e)
Maximum capacity index of indoor units connected to
SV units in refrigerant flow-through (c)
Maximum number of allowable SV units in refrigerant
flow-through (c)
Maximum number of ports of SV units in refrigerant
flow-through (c)
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, two 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<390
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
0.49 0.49
0.49 0.49
1.71 1.71
Model
SV1 SV4 SV6 SV8
250 400 600
250 140
— 250
650
4
16
64
Definition
Equivalent length [m]
0.5 m
1 m
6.7 m
SV6A SV8A
0.53 0.53
0.58 0.58
1.86 1.86
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
650