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Piping installation
Installer and user reference guide
70
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Definitions
Term
Definition
Actual piping length
Pipe length between outdoor
(a)
and indoor units
Equivalent piping length
Pipe length between outdoor
(a)
and indoor units,
including the equivalent length of the piping
accessories
Total piping length
Total piping length, from the outdoor to all indoor
units
(a) If the system is a multi outdoor installation, re-read "the first outdoor unit branch as
seen from the indoor unit".
Equivalent length of the piping accessories
Accessory
Equivalent length
Refnet joint
0.5 m
Refnet header
1 m
Single BS1Q100~160
4 m
Single BS1Q25
6 m
Multi BS4~16Q14
4 m
Allowable height difference
Term
Definition
Distance
Actual piping length
Pipe length between outdoor
(a)
and
indoor units
165 m
Equivalent piping
length
(b)
Pipe length between outdoor
(a)
and
indoor units
190 m
Total piping length
Total piping length from the
outdoor
(a)
to all indoor units
300 m
H1
Height difference between outdoor
and indoor units
50/40 m
(b)
H2
Height difference between indoor
units
15 m
30 m
(c)
H3
Height difference between outdoor
units
5 m
H4
Height difference between outdoor
unit and BP unit.
40 m
H5
Height difference between BP units
15 m
H6
Height difference between BP unit
and RA DX indoor unit
5 m
H7
Height difference between EKEXV-
kits and AHU units
5 m
(a) If the system capacity is a multi outdoor installation, re-read "the first outdoor
branch as seen from the indoor unit".
(b) The allowable height difference is 50 m in case the outdoor unit is positioned higher
than the indoor unit, and 40 m in case the outdoor unit is positioned lower than the
indoor unit.