Hydraulic Connections; Electrical Connections - Ariston NUOS 200 EXT Instructions D'utilisation

Heat pump water heater – TECHNICAL INFORMATION FOR INSTALLERS
Inlet air: Not ducted
Figure 6
Outlet air: externally ducted
Inlet air: internally ducted
Figure 7
Outlet air: externally ducted
Inlet air: externally ducted
Figure 8
Outlet air: externally ducted
Figure 9 Installation without ducting

4.4 Hydraulic connections

Connect the water heater inlet and outlet to pipes or pipe fittings that can withstand the operating pressure and
temperature of the hot water, which may reach 75°C. It is not advisable to use materials that cannot withstand such
temperatures.
Screw a "T" fitting identified by a blue collar onto the appliance's water inlet pipe.
It is mandatory to fit a safety valve onto the appliance's water inlet pipe. The device must comply with the EN
1487:2000 standard and must have a maximum pressure of 0.7 Mpa (7 bar). Moreover, it must at least include
the following components: a cut-off valve, a non-return valve, a control mechanism for the non-return valve, a
safety valve and a water pressure shut-off device.
The device's relief outlet must be connected to a relief pipe with a diameter no less than that of the appliance's
connection (3/4"), with the aid of a siphon creating an air gap of at least 20 mm to allow for visual inspection; this is to
prevent any harm to persons and animals or damage to objects should the device activate and for which the
manufacturer shall not be held liable. Use a flexible pipe to connect the pressure safety device inlet to the cold water
system pipe, using a cut-off valve if necessary. Additionally, a water discharge pipe must be fitted to the outlet in case
the drainage tap is opened.
Avoid overtightening the pressure safety device and do not tamper with it. It is normal for water to trickle from the
pressure safety device during the heating phase; for this reason, it is necessary to connect the outlet, which must
always be left exposed to the atmosphere, to a drainage pipe that slopes downwards and towards an area not subject
to frost. It is advisable to also connect the condensate outlet to the same pipe, through the connection located on the
lower side of the water heater.
The appliance must not operate with water hardness levels below 12°F; on the other hand, it is advisable to use a
suitably calibrated and monitored water softener in the event of particularly hard water; in this event, the residual
hardness must not fall below 15°F.
If the mains pressure is close to the calibrated valve values, a pressure reducer must be installed as far as possible
from the appliance.
See Figure 10.
WARNING! It is advisable to carefully wash the system's pipes in order to remove any residues of screw
thread, welding or dirt which may hamper the correct operation of the appliance.

4.5 Electrical connections

Permanent power supply
(cable supplied with the appliance)
EDF signal (cable not supplied with the appliance)
WARNING: BEFORE YOU GET ACCESS TO TERMINALS, ALL SUPPLY CIRCUITS MUST BE DISCONNECTED
The batteries ensure that the product is protected against corrosion, when the appliance is not powered.
The appliance is supplied with a power supply cable (should the latter need to be replaced, use only original spare
parts supplied by the manufacturer).
EXAMPLES
H05V2V2-F
59
Cable Protection
3G 1.5mm 2
2G 0.75mm 2
16A
2A