19
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Electrical installation
Installer and user reference guide
91
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
19.1.2 Field wiring: Overview
Field wiring consists of:
▪
power supply (including earth),
▪
DIII transmission wiring between communication box and outdoor unit,
▪
RS‑485 transmission wiring between communication box and monitoring system.
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.
▪
In order to avoid any electrical interference the distance between both wirings
should ALWAYS be at least 50 mm.
Transmission wiring
The transmission wiring outside the unit should be wrapped and routed together
with the field piping. See Finishing the outdoor unit installation.
Transmission wiring specification and limits
(a)
Vinyl cords with 0.75 to 1.25 mm² sheath or cables (2‑core wires)
Maximum number of branches for unit-to-unit cabling
9
Maximum wiring length
(distance between outdoor and furthest indoor unit)
300 m
Total wiring length
(sum of distances between outdoor and all indoor units)
600 m
(a)
If the total transmission wiring exceeds these limits, communication errors might occur.
No secondary branchings are allowed after any transmission wire branching.
A
B
C
b2
b3
c1
c2
b1
a
A
Outdoor unit
B
Indoor unit
C
Central user interface (etc...)
a
Main line
b1, b2, b3
Branch lines
c1, c2
No branch is allowed after branch
Example:
Содержание VRV IV-S RXYSQ4T8VB Series
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