HWA1-A & HWA1-H
Chillers and Air/Water heat pumps with axial fans
19
7.7.1
Wiring terminal block
Electrical wiring has to be done only by qualified personnel.
If the lightning risk is high, the unit must be protected, the risk assessment must comply with the CEI EN 62305-2
regulation.
If there is a possibility that a lightning can strike the area around the appliance, shut down the unit and disconnect
the system upstream switch.
Make sure to ground the unit.
Do not ground the unit with pipes or lightning rods
A poor grounding of the unit can result in electrocution.
It is required that the electrical connections comply with the regulations in force in the country of installation.
Warning: Electrostatic discharges can damage the electronic components, before performing any work; ground the
electrostatic charge by touching objects such as water or heating pipes.
The electrical connections have to be realized by qualified personnel.
The power supply of the units is 3-Ph/N/PE 400V, 50Hz. The power cables should be brought inside the electrical panel of the unit
and connected to the disconnecting switch inside the electric panel itself, in the bottom at the left, as shown in the following figure:
PE
PE
1
9 3
4
5
2
7
8
PE
PE
2
5
4
3
6
1
8
7
I ON
O
OFF
PE
L1
L2
L3
N
PE
The connections of the power supply cables to the disconnecting switch should be done starting from left to right as follows: L1 for
phase conductor 1, L2 for phase conductor 2, L3 for phase conductor 3, N for neutral line, PE earth conductor.
(*) Available for “
HWA1-A
” cooling only versions.
7.8
PM MODULE PHASES PROTECTION
The PM module detects the correct sequence of the 3-phases (L1, L2, and L3) power supply. The 3-phases power supply must be
connected with the correct sequence of the phases so as to ensure the right direction of rotation at the compressor start-up and
during operation. When the PM module acts for lack of phase, the controller will receive a signal to disconnect it from the power
supply.
7.1
PLANT MANAGEMENT OPTIONAL MODUL “GI” TERMINAL BLOCK
Where the plant management kit (optional) is present, a second controller is located inside the electric panel, which acts as I/O
ports expansion module. With this controller, it is possible to increase the number of logics that can be managed by the main
controller; for the configuration of the functionalities, please check the control manual supplied with the unit.
TERMINAL
TYPE
CONNECTION
12Va
Power supply 12 Vac
Power supply for remote control panel (keyboard)
12Vb
Power supply 12 Vac
Power supply for remote control panel (keyboard)
DI2
DI2 digital input
Remote on/off input (closed = unit is ON / open= unit is OFF)
GNDR
Serial communication
Modbus ground reference terminal connection for remote supervision
R+
Serial communication
signal terminal connection for supervision
R-
Serial communication
Modbus - signal terminal connection for supervision
*DO5
Under voltage output 230V ac, 50Hz, 5A
resistive, 1A inductive. Should be connected to
the relay coil in order to get a free contact.
Undervoltage output for alarm warning
N-3
Neutral for single-phase power supply
L3-3
Phase voltage 230Vac
PEA
Ground reference
