18
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Piping installation
Installer and user reference guide
85
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
Description
Model
BS4A
BS6A
BS8A
BS10A
BS12A
Maximum number of connectable
indoor units per BS unit (
a
)
20
30
40
50
60
Maximum number of connectable
indoor units per BS unit branch (
b
)
5
Maximum capacity index of
connectable indoor units per BS unit
(
a
)
400
600
750
Maximum capacity index of
connectable indoor units per branch
(
b
)
140
Maximum capacity index of
connectable indoor units per branch
if 2 branches are combined (
e
)
250
Maximum capacity index of indoor
units connected to BS units in
refrigerant flow-through (
c
)
750
Maximum number of ports of BS
units in refrigerant flow-through (
c
)
16
Maximum number of indoor units
connected to BS units in refrigerant
flow-through (
c
)
64
18.1.7 About the piping length
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
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
BS unit branch pipe
6.7 m
