About The Electrical Wiring - Daikin VRV IV+ Installer And User Reference Manual

6 | Installation

6.8.3 About the electrical wiring

Installer and user reference guide
78
It is important to keep the power supply and the transmission wiring separated
from each other. In order to avoid any electrical interference the distance between
both wiring should always be at least 25 mm.
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.
Field piping can be routed from front or bottom of the unit (going left or right).
Refer to "6.4.3 To route the refrigerant
▪ Be sure to follow the limits below. If the unit-to-unit cables are beyond these
limits, it may result in malfunction of transmission:
- 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: 16.
▪ Maximum number of independent interconnectable systems: 10.
▪ Up to 16 branches are possible for unit-to-unit cabling. No branching is allowed
after branching (see figure below).
a a
B
A
a Outdoor unit
b Indoor 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
4
piping" [ 52].
a
h
d
b
e
b
g
b
f
b
g
b
c
b
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10