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Electrical installation
Installer and user reference guide
90
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
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.
17.1.2 Field wiring: Overview
Field wiring consists of:
▪
Power supply (always including earth)
▪
Communication (= transmission) wiring between the compressor unit, the heat
exchanger unit, and the indoor units.
Example:
g
f
F1/F2
(16 V)
F1/F2
(16 V)
220-240 V
1~ 50 Hz
e
c
a
d
b
220-240 V
1~ 50 Hz
380-415 V
3N~ 50 Hz
a
Main switch
b
Earth connection
c
Power supply wiring (including earth) (sheathed cable)
F1/F2
Transmission wiring (sheathed + shielded cable) (using shielded cable for the
transmission wiring is mandatory for 5 HP, and optional for 8 HP)
d
Compressor unit
e
Heat exchanger unit
f
Indoor unit
g
User interface
Power supply wiring and transmission 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 wirings should ALWAYS be at least 50 mm.
NOTICE
▪
Be sure to keep the power line and transmission line apart from each other
(≥50 mm). Transmission wiring and power supply wiring may cross, but may not
run parallel.
▪
Transmission wiring and power supply wiring may NOT touch internal piping 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.
