15 Electrical installation
Installation and operation manual
26
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P546223-1B – 2020.10
15
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
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
Minimum
circuit
ampacity
Recommended
fuses
RXYTQ8
16.1 A
20 A
RXYTQ10
22.0 A
25 A
RXYTQ12
24.0 A
32 A
RXYTQ14
27.0 A
32 A
RXYTQ16
31.0 A
40 A
What?
Case 1
Case 2
Phase and frequency
3N~ 50 Hz
3N~ 60 Hz
Voltage
380-415 V
400 V
Transmission line
section
(a)
0.75~1.25 mm
2
(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),
▪ DIII transmission wiring between communication box and outdoor
unit,
▪ RS‑485 transmission wiring between communication box and
monitoring system.
Example:
a
b
d
d
d
c
b
g
g
h
h
c
f
f
f
h
e
e
e
a
h
h
h
h
h
i
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.
b
a
A
b a
c
c
c
d
c
d
c
8 HP
10~16 HP
A
A
a
Transmission wiring (possibility 1)
(a)
b
Transmission wiring (possibility 2)
(a)
. Fix to pipe insulation
with tie wraps.
c
Tie wrap. Fix to factory-mounted low voltage wiring.
d
Tie wrap.
(a)
Knockout hole has to be removed. Close the hole to avoid
small animals or dirt from entering.
