Initial Start-Up; Maintenance Regulations (For Authorised Personnel) - Ariston NUOS 200 EXT Instructions D'utilisation

Heat pump water heater – TECHNICAL INFORMATION FOR INSTALLERS
It is advisable to carry out a check on the electrical system to verify conformity to the regulations in force. Verify that
the electrical system can suitably withstand the water heater's maximum power consumption values (refer to the data
plate), in terms of the size of the cables and their conformity to the regulations in force. It is forbidden to use multiple
outlet sockets, extension cables or adaptors. It is forbidden to use piping from the water, heating and gas systems for
earthing the appliance.
Prior to operating the machine, make sure that the electricity mains voltage conforms to the value indicated on the
appliance's data plate. The manufacturer of the appliance shall not be held liable for any damage caused by failure to
earth the system or due to anomalies in the electric power supply. To disconnect the appliance from the mains, use a
bipolar switch complying with all applicable CEI-EN regulations in force (minimum distance between contacts 3 mm,
switch preferably equipped with fuses).
Use this configuration whenever users do not have a two-tier electricity rate.
Fig. 11
The water heater will always be connected to the power supply network to ensure 24h operation.
ELECTRICAL CONNECTION WITH TWO-TIER ELECTRICITY RATE
If users have a two-tier electricity rate and a suitable meter, the product may be powered only while the
lowest rate applies.
Fig. 12
During the period in which the appliance is not powered, protection against corrosion through the
impressed current anode is ensured by the rechargeable batteries.
ELECTRIC CONNECTION WITH TWO-TIER RATE AND HC-HP SIGNAL
Offers the same cost advantages compared to the two-tier rate configuration but, additionally, it allows for
obtaining rapid heating thanks to the BOOST mode that activates heating even with the HP rate.
1) Connect a bipolar cable to the appropriate signal contacts on the meter.
2) Connect the signal bipolar cable to the indicated terminal which is located inside the product, close to
Fig. 13
the supply terminal. WARNING: the signal cable must be inserted in the hole beneath the power supply
cable then anchored with suitable cable clips located inside the product, along the same route of the
power supply cable, and tightened in the cable glands near the appropriate terminal; make a suitably-
sized hole in the rubber rings for the passage of the cable.
3) Activate the HC-HP function through the installer menu (see Paragraph 7.6).

4.6 Initial start-up

Once the appliance is connected to the hydraulic and electric systems, the water heater must be filled with water from
the domestic water supply network. In order to fill the water heater, it is necessary to open the central tap of the
domestic network supply and the nearest hot water tap, while making sure that all the air in the tank is gradually
expelled.
Visually inspect for possible water leaks from the flange and pipe fittings and gently tighten them, if necessary.
Remove the tab from the batteries, the battery housing is located beneath the frame, to the right of the
interface – refer to the picture 16.

5. MAINTENANCE REGULATIONS (for authorised personnel)

WARNING! Observe the general warnings and safety instructions listed in the previous
paragraphs and strictly adhere to the indications therein contained.
All maintenance operations and interventions should be performed by qualified personnel (i.e. with the
necessary requirements as outlined in the applicable norms in force).
PERMANENT ELECTRICAL CONNECTION
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