Ariston NIMBUS PLUS M NET Manual page 74

Internal Unit electrical connection
Before any operation on the system, turn off the main power. Observe
the phase and neutral connections.
To access the control panel of the internal unit, proceed as follows: Re-
move the three screws (A) indicated in figure and remove the cover of
the electrical panel (B).
When opening the internal unit, you will find the following
connections:
ANODE - Tank Protech anode connection.
Observe the electrical polarities.
TA1 - Ambient contact thermostat connection, zone 1.
TA2 - Ambient contact thermostat connection, zone 2.
SE - Outdoor temperature sensor connection.
TNK - Tank sensor connection.
BUF - Buffer sensor connection.
BUS - BUS connection for System interface and
BUS connection between internal and external unit.
IN-AUX - Humidistat/auxiliary input connection.
HV IN 3 - 230V Input. Select the operation mode by the parameter
17.1.2.
PV Integration: through this input is possible to use the DHW
tank as energy storage in case of a surplus of energy produc-
tion by a PV system. Connect the output contact from an energy
meter to the PV input, the output contact is closed when the
energy production is higher than a threshold settable on the
energy meter.
HV IN 1 - 230V Input.
Select the operation mode by the parameter 17.1.0.
• EDF (Night tariff): applying a 230V signal to the input
the tank charge is enabled according to the DHW modes
HC-HP or HC-HP 40°C selectable by the parameter 17.5.2
• SG Ready 1: input signal nr 1 for the SG Ready standard
(see paragraph SMART GRID READY STANDARD).
• External switch off signal: set the machine to OFF.
HV IN 2 - 230V Input. Select the operation mode by the parameter
17.1.1.
•DLSG (load shedding): this input signal, if supplied by the elec-
trical grid provider, disable the heating resitors.
•SG Ready 2: input signal nr 2 for the SG Ready standard (see
paragraph SMART GRID READY STANDARD).
OUT-AUX 1- Auxiliary output, free potential contact
(see parameter 17.1.4)
ST1 - Safety thermostat connection (230 V)
for under-floor system (shunt connection).
PM AUX- Auxiliary pump connection.
V1 - Diverter valve connection for domestic water circuit
V 2 - Diverter valve connection for cooling circuit
L 1 - Three-phase power phase 1 connection (230 V)
for internal unit
L 2 - Three-phase power phase 2 connection (230 V)
Low voltage terminal block of
internal unit
ANODE
TA 1 TA 2 SE TNK BUF
+24V
74 / GB
High voltage terminal block of
internal unit
BUS IN
B T AUX 1
L L
N
230V
L
for internal unit
L 3 - Three-phase power phase 3 connection (230 V)
for internal unit
N - Connection of the neutral point (230 V) of the internal unit .
- Earth connection of the internal unit .
The size and length of the cables must be sized according to the
power indicated on the data plate of the internal unit.
Ensure that the power cables are properly tightened in order to
avoid overheating.
WARNING
After carrying out the connections between the indoor and
outdoor units, put back both panels of the respective units.
Power supply terminal block of internal unit
L L L
1 2 3
L
A
B
N N L L L N N
1 2 3
N L N