Instructions For Use; Control Panel Description - Ariston Nuos Split Flex 150L Manual

Heat pump water heater – OPERATING AND MAINTENANCE INSTRUCTIONS

nutrients, biofilm and sediment within the installation including water heaters, etc. Sediment can support the growth
of Legionella bacteria and it should be removed on a regular basis from e.g. storage systems, water heaters, non-
flown through expansion vessels (e.g. once a year).
Regarding to this storage water heater, if
1) the product is switched-off for a period of time [months] or
2) the water temperature is constantly maintained between 25°C and 50°C,
the Legionella bacteria could growth inside the tank. In these cases, to restrict the Legionella growth, it is necessary to
perform the so called "thermal disinfection cycle".
This storage water heater is sold with a software that, if it is enabled, carry out a "thermal disinfection cycle" to restrict
the Legionella growth inside the tank.
This cycle complies with the hot water installations and relevant recommendations for Legionella prevention specified
in the following Table 2 of the CEN/TR 16355.
Hot and cold water separately
No storage
No With
circulation circulation
of hot water of hot water
C.1
Rif. In Allegato C
≥ 50°C
Temp. -
≤ 3 l
Ristagno -
Sedimento -
a. Temperature ≥ 55°C the whole day or at least 1h per day ≥60°C.
b. The volume of water contained in the pipework between the circulation system and the tap which has the greatest distance to the
system.
c. Remove the sediment from the storange water heater in accordance with the local conditions but at least once a year.
d. Thermal disinfection for 20 min at a temperature of 60°C, for 10 min at 65°C or for 5 min at 70°C at every draw-off point at least
once a week.
e. The water in the circulation loop shall be not less than 50°C.
No requirement.
-
This electronic storage water heater is sold with a thermal disinfection cycle function not enabled for default; as a
consequence, if, for any reason, one of the above said "Conditions for Legionella growth" could occur; it's hardly
recommended to enable such function by following the instructions mentioned in this booklet [see par. 7.9].
However, this thermal disinfection cycle is not able to destroy any Legionella bacteria in the storage tank; so, if this
function is then disenabled, Legionella bacteria growth might re-take place again.
Note: when this software carries out the thermal disinfection treatment, the energy consumption of the storage water
heater is expected to increase.
Warning: when this software has been carrying out the thermal disinfection treatment, water temperature can cause
severe burns instantly. Children, disabled and elderly are at highest risk of being scalded. Feel water before
bathing or showering.

7. INSTRUCTIONS FOR USE

7.1 Control panel description

Refer to Fig. 16.
The control panel, constructed in a simple and rational way, comprises two buttons and a central knob.
In the upper section, a DISPLAY shows the set temperature or the detected temperature, besides other specific
indications such as the operation mode signal, fault codes, settings and information of the product's condition.
The SMILE LED is positioned below the control and 48isualize zones: it signals the operating status of water heating in
the heat pump or heating element.
Types of hot water installation
Storage
No With
circulation circulation
of hot water of hot water
C.2 C.3 C.4
In the
storage
≥ 50°C
e e
water
heater
a
≤ 3 l
b - b
- Remove C Remove C
Mixed hot and cold water
No storage upstream of mixing Storage upstream of mixing
valves
No circulation With circulation
of hot water of hot water circulation
of mixed
C.5 C.6
Thermal Thermal storage
disinfection disinfection
d d
heater
≤ 3 l
- b
- - Remove
48
No storage upstream of
valves mixing valves
No With circulation No circulation
of mixed water of mixed water
water
C.7 C.8 C.9
In the
≥ 50°C
e
Thermal
Thermal
water disinfection
disinfection
d
a
≤ 3 l
- b -
C Remove C -
With
circulation of
mixed water
C.10
Thermal
disinfection
d d
≤ 3 l
b
-