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Electrical installation
Installer and user reference guide
106
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
NOTICE
▪
Be sure to keep the power line and transmission line apart from each other.
Transmission wiring and power supply wiring may cross, but may not run parallel.
▪
Transmission wiring and power supply wiring may not touch internal piping
(except the inverter PCB cooling pipe) in order to avoid wire damage due to high
temperature piping.
▪
Firmly close the lid and arrange the electrical wires so as to prevent the lid or
other parts from coming loose.
The transmission wiring outside the unit should be wrapped and routed together
with the field piping.
Be sure to follow the limits below. If the unit-to-unit cables are beyond these limits,
it may result in malfunction of transmission:
Description
Limitation
Maximum wiring length
1000 m
Total wiring length
2000 m
Maximum inter unit wiring length between outdoor
units
30 m
Transmission wiring to cool/heat selector
500 m
Maximum number of branches for unit-to-unit
cabling
(a)
16
Maximum number of independent interconnectable
systems
10
(a) No branching is allowed after branching (see figure below).
In case of heat pump system
a
a
a
A
B
b
b
b
b
b
b
h
e
f
g
g
d
c
a
Outdoor unit
b
Indoor unit + BS unit
c
Main line
d
Branch line 1
e
Branch line 2
f
Branch line 3
g
No branch is allowed after branch
h
Central user interface (etc...)
A
Outdoor/indoor transmission wiring
B
Master/slave transmission wiring
