Electric Connections; Recommended Electric Cable Section; Electric Power Connection To The Electrical Mains - AERMEC WRL 200 Installation & Maintenance Manual

6.

ELECTRIC CONNECTIONS

The WRL heat pumps are completely wired at
the factory and only require connection to the
electrical mains, downstream from a unit switch,
according to that envisioned by the Standards in
force on this subject in the country of installation.
It is also advised to check that:
• The electrical mains features are suitable
for the absorption values indicated in
the electrical data table, TAB. also taking
into consideration any other machines
operating at the same time.
The unit is only powered when installation
•
has been completed (hydraulic and
electric).
Respect the connection indications of the
•
phase, and earth wires.
• The power supply line must have a
relevant protection mounted upstream
against short circuits and dispersions to
earth, which isolates the system with
respect to other utilities.
• The voltage must be within a tolerance
of ±10% of the nominal power supply
voltage of the machine (for unbalanced
three-phase unit max 3% between the
phases). Whenever these parameters are
not respected, contact the electric energy
public body. For electric connections,
use the cables with double isolation
according to the Standards in force on this
subject in the different countries.
• The use of an omnipolar magnet
circuit breaker switch is mandatory, in
compliance with the IEC-EN Standards
(contact opening at least 3 mm), with
suitable cut-off power and differential
protection on the basis of the electric data
table shown below, installed as near as
possible to the appliance.
It is mandatory to make an effective earth
•
connection. The manufacturer cannot be
considered responsible for any damage
caused by the lack of or ineffective
appliance earth connection.
• For units with three-phase power supply,
check the correct connection of the
phases.
WARNING:
It is prohibited to use the water pipes to earth the
appliance.
IWRLI2_13.04_5890700_00
All the electrical operations must be carried out bySTAFF IN POSSESSION OF THE
NECESSARY QUALIFICATIONS BY LAW, suitably trained and informed on the risks related
to these operations.
The characteristics of the electrical lines and of the related components must be
determined by STAFF QUALIFIED TO DESIGN ELECTRICAL SYSTEMS, in compliance with
the international and national regulations of the place of installation of the unit and in
compliance with the regulations in force at the moment of installation.
For the installation requirements refer only to the electrical diagram supplied with the
appliance. The electrical diagram along with the manuals must be kept in good condition
and ALWAYS AVAILABLE FOR ANY FUTURE SERVICING ON THE UNIT.
IT ISmandatory to verify that the machine is watertight before making the electrical
connections and it must only be powered up after the hydraulic and electrical works have
been completed.
6.1.
RECOMMENDED ELECTRIC CABLE SEC-
TION
The cable section shown in the table are
recommended for maximum lengths of 50m.
For longer lengths or different cable laying, it is
up to the PLANNER to calculate the appropriate
line switch, the power supply line as well as the
connection to the earth wire and connection cables
depending on:
• the length
• the type of cable
the absorption of the unit and the physical
•
location, and the ambient temperature.
ATTENTION:
Check the tightening of all power wire clamps on
commissioning and after 30 days from start-up.
Subsequently, check the tightening of all the
power clamps every six months.
Loose terminals can cause overheating of the
cables and components.
6.2.
ELECTRIC POWER CONNECTION TO THE
ELECTRICAL MAINS
Before connecting the unit to the power
1.
supply mains , ensure that the isolating
switch is open.
Open the front panel
2.
Use the holes at the top on the
3.
framework for the main electric power
supply cable and for the cables of the
other external connections under the
responsibility of the installer.
4. It is forbidden to access with electric
cables in positions not specifically
envisioned in this manual.
5. Avoid direct contact with not insulated
copper piping and with compressor.
Identify the clamps for the electric
6.
connection, always refer to the electric
layout supplied with the unit.
For the functional connection of the
7.
unit bring a power supply cable to the
electric control board inside the unit
and connect to the U-N and PE clamps
respecting (U) phase, (N) neutral, (PE)
earth in case of single-phase power
supply (230V~50Hz),
U-V-W like phases, N like neutral and PE
8.
like earth in case of three-phase power
supply (400V-3N~50Hz).
Re-position the inspection panels
9.
Ensure that all protections removed
10.
for the electric connection have been
restored before electrically powering
the unit.
Position the main system switch (external
11.
to the appliance) at "ON".
11