Default Settings; Anti-Legionnaire's Disease Protection; Operation With Two-Tier Electricity Rate; Anti-Frost Function - Ariston NUOS 200 EXT Instructions D'utilisation

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

7.8 Default settings

The appliance is manufactured with a series of default modes, functions or values, as indicated in the table below:
AUTO MODE
BOOST MODE
PRE-SET TEMPERATURE
MAX. TEMPERATURE SETTABLE WITH THE
P1
HEATING ELEMENT
P2
MINIMUM SETTABLE TEMPERATURE
P3 MAX. TEMPERATURE SETTABLE WITH THE HEAT
P4
GREEN MODE
P5

ANTI-LEGIONNAIRE'S DISEASE PROTECTION

P6
VOYAGE MODE
P7
DEFROST (active defrost activation)
P8
HC-HP (two-tier rate operation mode)
P9
TIME_W (no. of accepted hours of powering)

7.9 Operation with two-tier electricity rate

To be able to operate also on appliances with a two-tier rate system, the control logic calculates the number of
average hours a day during which the power supply is available in the economy mode (HC).
A self-learning function ensures that the appliance reaches the pre-set temperature in the time range during which the
economy rate applies; the maximum limit of hours is determined by the P9 TIME_W parameter; after the initial start-up
(or after switching off the hardware), the default setting is 8 hours.

7.10 Anti-frost function

In any event, if the temperature of the water in the tank falls below 5°C while the appliance is powered, the heating
element (1,000 W) will be automatically activated to heat the water up to 16°C. If the GREEN mode is set, the
appliance will perform this operation through the heat pump.
7.11 Faults
As soon as a fault occurs, the appliance enters into the fault mode while the display emits flashing signals and
visualises the error code. The water heater will continue supplying hot water provided the fault affects only one of two
the heating units, by activating the heat pump or heating element.
If the fault involves the heat pump, the symbol "HP" will flash on the screen, while the heating element symbol will
flash if the fault involves this component. If both components are affected, both symbols will flash.
Parameter
PUMP
Factory default setting
ACTIVATED
ACTIVATED
DEACTIVATED
DEACTIVATED
DEACTIVATED
ACTIVATED
DEACTIVATED
67
55°C
65°C
50°C
55°C
8h