Turning The Water Heater On/Off; Setting The Temperature; Mode Of Operation - Ariston NUOS Manual

Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER

7.2 Turning the water heater on/off

Turning the appliance on: simply press the ON/OFF button to turn the water heater
on.
The DISPLAY visualises the "set" temperature and operation mode, while the HP
symbol and/or heating element symbol indicate the operation of the heat pump and/or
heating element respectively.
Turning the appliance off: simply press the ON/OFF button to turn the water heater off, only "OFF" appears on the
display. The protection against corrosion is still ensured (in case HC-HP contact works, insert rechangeble batteries,
see figure 1 and par. 5), while the product will automatically ensure that the temperature of the water in the tank does
not fall below 5°C.

7.3 Setting the temperature

The desired temperature for the hot water (T SET POINT) can be set by turning the knob clockwise or anti-clockwise
(the visualised temperature will flash temporarily).
To visualise the current temperature of the water in the tank, press and release the knob; the relative value will appear
for 8 seconds then the set temperature will reappear once again.
The temperatures that can be obtained in the heat pump mode vary between 50°C and 55°C, by factory default
setting, and 40°C-55°C, by varying the setting on the installer menu (P13).
The maximum temperature that can be obtained with the heating element is 65°C, by factory default setting
where expeted, and 75°C, by varying the setting on the installer menu (P11).

7.4 Mode of operation

In normal operating conditions, the "mode" button can be used to vary the operating
mode through which the water heater reaches the set temperature. The selected
mode will be visualised on the line below the temperature.
If the heat pump is active, the following symbol will appear:
If the heating element or integration (P8=3) are active, the
following symbol will appear:
• GREEN: the water heater uses only the heat pump to ensure maximum energy saving. This function is
recommended for air temperatures higher than 0°C during heating and for normal operation. The maximum
temperature that can be reached depends on the value of the P13 parameter (51°C-62°C) – refer to Paragraph 7.7.
For air conditions outside the pump's operating range, the integration is enabled (except for P8=2). The integration
is always enabled in case of anti-Legionella and antifreeze.
• AUTO: this default function is disabled, to make it selectable set the P8 parameter value to 1 or 3. The water heater
learns how to reach the desired temperature in a limited number of hours, with rational use of the heat pump and,
only if necessary, of the integration. The maximum number of hours used depends on the P14 parameter - TIME_W
(See paragraph 7.7), that is set by default at 8 hours. (recommended during the winter to ensure better comfort).
The integration is always enabled in case of anti-Legionella and antifreeze.
• BOOST: by enabling this mode the water heater simultaneously uses the heat pump and the integration to reach
the desired temperature in the least time possible. Once the temperature has been reached, operation returns to
the previous mode. This mode is not selectable when the P8 parameter value is 2.
• BOOST2 (P5 can be enabled on the installer's menu): this default function is disabled, to make it selectable set
the P8 parameter value to 1 or 3. By enabling this mode the water heater simultaneously uses the heat pump and
the integration to reach the desired temperature in the least time possible. Compared to Boost, the Boost2 mode is
always enabled, even after reaching the set temperature. The integration is always enabled in case of anti-
Legionella and antifreeze.
• VOYAGE (to be activated through the installer menu P3): studied for situations in which users are absent from
the appliance's operating location; this mode allows for programming the number of days of absence, during which
the water heater will remain turned off. The appliance will activate only to supply hot water on the day of arrival;
protection against corrosion will continue to be guaranteed while the product will automatically ensure that the
temperature of the water in the tank does not fall below 5°C. Press the "mode" button until selecting the VOYAGE
mode, turn the knob to set the number of days ("days") then press the knob to confirm. The display will only
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