Safety Device Requirements; Field Wiring: Overview; To Route And Fix The Transmission Wiring - Daikin RXYLQ10T7Y1B Series Installation And Operation Manual

15 Electrical installation
▪ EN/IEC 61000‑3‑12 provided that the short-circuit power S
greater than or equal to the minimum S
point between the user's supply and the public system.
▪ EN/IEC 61000‑3‑12 =
Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input
current >16 A and ≤75 A per phase.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a short-circuit power S
minimum S value.
sc
Model
RXMLQ8 + RXYLQ10~14
INFORMATION
Multi units are standard combinations.
15.2

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.
For standard combinations
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
RXMLQ8
RXYLQ10
RXYLQ12
RXYLQ14
For all models:
▪ Phase and frequency: 3N~ 50 Hz
▪ Voltage: 380~415 V
▪ Transmission line section: 0.75~1.25 mm
1000 m. If the total transmission wiring exceeds these limits, it
may result in communication error.
For non-standard 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 RXYLQ18 by using the RXMLQ8 and
the RXYLQ10.
▪ Minimum circuit ampacity of the RXMLQ8=16.1 A
▪ Minimum circuit ampacity of the RXYLQ10=22.0 A
Accordingly, the minimum circuit ampacity of the
RXYLQ18=16.1 A+22.0 A=38.1 A
Multiply the above result by 1.1: (38.1 A×1.1)= 41,91 A,
so the recommended fuse capacity would be 45 A.
NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
Installation and operation manual
28
sc
value at the interface
sc
European/International Technical
greater than or equal to the
sc
Z (Ω) Minimum S
max sc
value (kVA)
— 5638.32
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
2
, maximum length is
is
15.3

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
d
i
c
b
h
a
b g
c
e
h
h 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 Hz
Power supply 1~ 50 Hz
Earth wiring
15.4 To route and fix the transmission
wiring
Transmission wiring can be routed through the front side only. Fix it
to the upper mounting hole.
A
b 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.
(a) Knockout hole has to be removed. Close the hole to avoid
small animals or dirt from entering.
d d
h
g
e e
h h
h h
f f
c
c
d
A
(a)
(a)
. Fix to pipe insulation
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1B – 2020.10