MTA NGSi 05, Technical Manual, Page: 14 / 58

TECHNICAL MANUAL
Chapter 7
- Installation
NGSi 05÷15
12
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
7 . 7 E l e c t r i c a l c o n n e c t i o n s
Check that the electricity supply corresponds to the unit’s rated data (voltage, phases and frequency) marked on the nameplate on its right-
hand panel. The electrical connection must be made in accordance with the wiring diagram supplied with the unit and with the local and
international regulations (provide a magneto-thermal master switch, differential security breakers for each line, suitable ground connection
for the system, etc.). The power supply cables, electrical protection devices and line fuses must be of the size stated in the unit’s wiring
diagram and in the electrical data in the technical specification table (see Section
“Technical data”
).
7.7.1 Connection terminal board
The electrical connections must be made by qualified staff. The connection terminal board underneath the plastic cover on the same side
as the water connections (for the 10 and 15 models, the protective casing must be removed). When connecting the terminal board, comply
with the instructions provided below (the drawing is guideline).
The connections described below are standard. Other connections are described in the table in Point 9.25.
After maintenance procedures, put the panels back in place, securing them with the fixing screws.
WARNING:
There must be no variations in the power supply voltage in excess of ±10% of the nominal value. If this tolerance is not
complied with, please contact our technical department.
WARNING:
The electricity supply must comply with the stated limits: otherwise, the warranty becomes null and void immediately. Before
starting any work on the unit, make sure that the electricity supply is disconnected.
WARNING:
The flow switch (B in the water system diagram above and installed in the factory) must ALWAYS be connected as stated in
the wiring diagram. Never bridge the flow switch connections on the terminal board. No warranty cover will be provided if
the flow switch connections have been modified or incorrectly connected.
WARNING:
The remote control panel is connected to the chiller by 4 cables with gauge 1.5 mm
2
. The power supply cables must be
separate from the remote control cables. Maximum distance 50 metres.
WARNING:
The remote control panel cannot be installed in an area with strong vibrations, corrosive gases, excess dirt or high humidity
levels. Leave the area close to the cooling system unobstructed.
The connections to the terminal board must only be made by qualified staff.
Terminal Type Connection
GND power supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz in the 15kW size) connect the ground cable
N1 power supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz in the 15kW size) connect the mains neutral cable
L1 power supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz in the 15kW size) connect the mains live cable (in three-phase versions, there
are two additional terminals, L2 and L3).