Daikin VRV 5-S - Refrigerant Piping Length and Height Difference

18 | Piping installation
Installer and user reference guide
92
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
Description Model
SV1 SV4 SV6 SV8
Maximum capacity index of connectable indoor units
per SVunit (a)
250 400 600 650
Maximum capacity index of connectable indoor units
per branch (b)
250 140
Maximum capacity index of connectable indoor units
per branch if two branches are combined (e)
— 250
Maximum capacity index of indoor units connected to
SV units in refrigerant flow-through (c)
650
Maximum number of allowable SVunits in refrigerant
flow-through (c)
4
Maximum number of ports of SVunits in refrigerant
flow-through (c)
16
Maximum number of indoor units connected to SVunits
in refrigerant flow-through (c)
64
18.1.7 Refrigerant piping length and height difference
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 Definition
Actual piping length Pipe length between outdoor and
indoor units
Equivalent piping length Pipe length between outdoor and
indoor units, including the equivalent
length of the piping accessories
Total actual piping length Total piping length, from the outdoor to
all indoor units
Equivalent length of the piping accessories
Accessory Equivalent length [m]
Refnet joint 0.5m
Refnet header 1m
SV unit branch pipe 6.7m
Total downstream
indoor unit capacity
Equivalent length of SV unit [m]
SV1A SV4A SV6A SV8A
<150 0.49 0.49 0.53 0.53
150≤x<290 0.49 0.49 0.58 0.58
290≤x<390 1.71 1.71 1.86 1.86