20
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Electrical installation
Installer and user reference guide
117
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
NOTICE
▪
The reversed phase protection detector of this product only functions when the
product starts up. Consequently reversed phase detection is not performed
during normal operation of the product.
▪
The reversed phase protection detector is designed to stop the product in the
event of an abnormality when the product is started up.
▪
Replace 2 of the 3 phases (L1, L2, and L3) during reverse-phase protection
abnormality.
20.1.2 About the electrical wiring
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
"18.2.4 To route the refrigerant piping"
92].
Transmission wiring specification and limits
(a)
Vinyl cords with 0.75 to 1.25 mm²
sheated and shielded
cables (2‑core wires)
(b)
Maximum number of branches for unit-to-unit cabling
16
Maximum wiring length
(distance between outdoor and furthest indoor unit)
1000 m
Total wiring length
(sum of distances between outdoor and all indoor units)
2000 m
Maximum inter-unit wiring length between outdoor units
30 m
Maximum number of independent interconnectable systems
10
(a)
If the total transmission wiring exceeds these limits, communication errors might occur.
(b)
Sheathed and shielded cables are required for transmission wiring between outdoor unit
and BS unit. Wiring between BS unit and indoor units does not require shielded cables.
