Turning The Water Heater On/Off; Setting The Temperature; Mode Of Operation - Ariston Nuos Split Flex 150L Manual

Heat pump water heater – OPERATING AND MAINTENANCE INSTRUCTIONS

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 49isualize49 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. The "SMILE LED" turns off,
as does the DISPLAY light and other previously active signals; only "OFF" appears on the display. The protection against
corrosion is still ensured, 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 can be set by turning the knob clockwise or anti-clockwise (the 49isualize49
temperature will flash temporarily).
To 49isualize 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. By accessing the installer menu (illustrated in Paragraph 7.7), the interval range can be extended to between
40 °C and 62 °C (bear in mind that temperatures exceeding 55 °C in the heat pump mode may lead to greater wear of
the compressor).
The maximum temperature that can be obtained with the heating element is 65 °C, by factory default setting, and
75 °C, by varying the setting on the installer menu.

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 49isualize49 on the line below the temperature.
If the heat pump is active, the following symbol will appear:
If the heating element is active, the following symbol will appear:

AUTO (to be activated through the installer menu): the water heater understands how to reach the desired
temperature in a few hours, through the rational use of the heat pump and, only if necessary, of the heating
element. The maximum number of hours it takes depends on the P9 – TIME_W parameter (see Paragraph 7.7),
which is set to 8 hours by default. (recommended for winter to ensure the better comfort).

BOOST: by activating this mode, the water heater simultaneously uses the heat pump and heating element to
reach the desired temperature in the shortest possible time. Once this temperature is reached, the AUTO
operating mode is restored.

BOOST 2 (to be activated through the installer menu): Compared to Boost, the Boost2 mode remains active
even after the set temperature is reached.

GREEN: the water heater will use the heat pump, thereby ensuring maximum energy saving! The maximum
temperature that can be reached depends on the value of the P3 parameter (51 °C-62 °C) – refer to Paragraph
7.7. The heating element may turn on only in the event that occurs inhibition of operation of the heat pump (errors,
air temperature out of operating range, defrosting process in progress, anti-legionnaire's disease). This function
is recommended for air temperatures above 0 °C during the hours of heating.

PROGRAM (to be activated through the installer menu): You have two programs P1 and P2, which may act
either individually or in combination with each other during the day (P1 + P2). The device will be able to activate
the heating phase to reach the selected temperature set in the timetable, giving priority to heating by heat pump
and, if necessary, through the heating elements.
Press the mode button to select the desired Program mode, turn the knob to set the desired temperature, press
it again to confirm, turn the knob to set the desired time and press to confirm; mode P1 + P2 can set the
information for both programs. In the case of electrical connection with two-tier price signal HC / HP, you still
possible program the water heater at any time of day. For this function is required the setting of the current time,
see the next paragraph.
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