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15 Electrical installation
15
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
NOTICE
This is a class A product. In a domestic environment this
product may cause radio interference in which case the
user may be required to take adequate measures.
15.1
Safety device requirements
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
RXYTQ8
RXYTQ10
RXYTQ12
RXYTQ14
RXYTQ16
What?
Case 1
Phase and frequency
3N~ 50 Hz
Voltage
380-415 V
Transmission line
(a)
section
(a)
Maximum length is 1000 m. If the total transmission wiring
exceeds these limits, it may result in communication error.
For multi combinations
Calculate the recommended fuse capacity.
Formula
Calculate, by adding the minimum circuit amps of each
used unit (according to the table above), multiply the
result by 1.1 and select the next higher recommended
fuse capacity.
Example
Combining the RXYTQ30 by using the RXYTQ8,
RXYTQ10, and RXYTQ12.
▪ Minimum circuit ampacity of the RXYTQ8=16.1 A
▪ Minimum circuit ampacity of the RXYTQ10=22.0 A
▪ Minimum circuit ampacity of the RXYTQ12=24.0 A
Accordingly, the minimum circuit ampacity of the
RXYTQ30=16.1+22.0+24.0=62.1 A
Multiply the above result by 1.1: (62.1 A×1.1)=68.3 A,
so the recommended fuse capacity would be 80 A.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
15.2
Field wiring: Overview
Field wiring consists of:
▪ power supply (including earth),
Installation and operation manual
26
Minimum
Recommended
circuit
fuses
ampacity
16.1 A
20 A
22.0 A
25 A
24.0 A
32 A
27.0 A
32 A
31.0 A
40 A
Case 2
3N~ 60 Hz
400 V
2
0.75~1.25 mm
▪ DIII transmission wiring between communication box and outdoor
unit,
▪ RS‑485 transmission wiring between communication box and
monitoring system.
Example:
a
d
d
i
c
b
h
a
b
g
c
e
e
h
h
h
h
f
f
a
Field power supply (with earth leakage protector)
b
Main switch
c
Earth connection
d
Outdoor unit
e
Indoor unit
f
User interface
g
Indoor power supply wiring (sheathed cable) (230 V)
h
Transmission wiring (sheathed cable) (16 V)
i
Outdoor power supply wiring (sheathed cable)
Power supply 3N~ 50/60 Hz
Power supply 1~ 50/60 Hz
Earth wiring
15.3
To route and fix the transmission
wiring
Transmission wiring can be routed through the front side only. Fix it
to the upper mounting hole.
8 HP
A
b
a
A
a
Transmission wiring (possibility 1)
b
Transmission wiring (possibility 2)
with tie wraps.
c
Tie wrap. Fix to factory-mounted low voltage wiring.
d
Tie wrap.
VRV IV+ heat pump for high ambient temperatures
d
h
g
e
h
h
f
10~16 HP
c
c
c
d
A
b
a
(a)
(a)
. Fix to pipe insulation
RXYTQ
4P546223-1C – 2021.11
c
c
d
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