11
GB
Note 2:
The sizing of the power supply cables is to be ensured by the installer in accordance with the installation conditions and
as per current standards.
Cable sizes, indicated below, are given for information purposes.
They are calculated in accordance with NFC 15-100 (≈ CEI 364) with the following hypotheses:
- Maximum current, see table below.
- Multi-pole copper cable with PR insulation.
- Installation in conduit (installation method No. 3 A / 4 A / 5 A). No other power cable.
- Ambient temperature 35°C.
Note 3
: Electromagnetic compatibility - Harmonic currents:
• These models comply with the requirements of standard EN61000-3-12 defining the limits for harmonic current emissions
In this case, for these models, the minimum short-circuit ratio “R
sce
” value to be respected is:
- 350 for the single-phase
models,
- 120 for the three-phase
models.
This value must be checked according to the characteristics of the network to which the installation is connected.
• Single-phase R
sce
=
• Three-phase R
sce
=
- Such that: Sc = Three-phase short-circuit power of the network.
Sc =
where: U
nominal
= nominal voltage between phases,
Z = impedence of the network at the main's frequency.
- Such that: Seq = Assigned apparent power of the unit,
single-phase Seq = U
p
x I
abs
(U
p
= single-phase voltage),
Three-phase Seq = x U
i
x I
abs
(U
i
= voltage between phases).
4.3.2.1 - 230 V single-phase power supply
• Power is supplied separately on the indoor unit's power terminal. See diagram below.
Note
: consult the outdoor unit's installation manual regarding its power supply.
3
Sc
3 x Seq
Sc
Seq
U
2
nominal
Z
Power supply amperages and cable sizes
- The sections are given as an indication only. They have to be verified and adapted, if necessary, according to the
installation conditions and the standards in force.
