15 Electrical installation
Installation and operation manual
27
RK RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1B – 2021.12
Power supply: Compressor unit
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
Model
Minimum circuit
ampacity
Recommended
fuses
RKXYQ5
13.5 A
16 A
RKXYQ8
17.4 A
20 A
▪ Phase and frequency: 3N~ 50 Hz
▪ Voltage: 380-415 V
Transmission wiring
Transmission line section:
Transmission wiring
Sh shielded cable (2
wires)
Vinyl cords
0.75~1.25 mm²
(using shielded cable for the
transmission wiring is mandatory
for 5 HP, and optional for 8 HP)
Maximum wiring length
(= distance between compressor
unit and furthest indoor unit)
300 m
Total wiring length
(= distance between compressor
unit and all indoor units, and
between compressor unit and
heat exchanger unit)
600 m
If the total transmission wiring exceeds these limits, it may
result in communication error.
15.3
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 (sh 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
Branches
No branching is allowed after branching.
D
B
C
b2
b3
c1
c2
b1
a
A
A
Central user interface (etc...)
B
Compressor unit
C
Indoor unit
D
Heat exchanger unit
a
Main line. The main line is the line to which the
transmission wiring of the heat exchanger unit is
connected.
b1, b2, b3
Branch lines
c1, c2
No branch is allowed after branch
15.4
To connect the electrical wiring on
the compressor unit
NOTICE
▪ Follow the wiring diagram (delivered with the unit,
located on the switch box cover).
▪ Make sure the electrical wiring does NOT obstruct
proper reattachment of the service cover.
1
Remove the service covers of the compressor unit and the
switch box.
2
Connect the transmission wiring as follows:
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
b
X2M
X2M
X2M
X1M (A1P)
RKXYQ5
RDXYQ5
TO OUT/D
TO IN/D
F1 F2
F1 F2
a1
a2
a2
a
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
b
a
RKXYQ8
RDXYQ8
TO OUT/D
TO IN/D
F1 F2
F1 F2
8 HP
5 HP
a
Sh shielded cable (2 wires) (no polarity)
a1, a2
Connection of shield to earth
b
Terminal board (field supply)
