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NUOS Plus - User Manual

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Heat pump water heater -

Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER 6.4 Recommendations for prevention of Legionella growth (based on European standard CEN/TR 16355) Informative Legionella are small rod shaped bacteria which are a natural constituent of all fresh waters. Legionaries’ disease is a serious pneumonia infection caused by inhaling the bacteria Legionella pneumophilia or other Legionella species. This bacterium is frequently found in domestic, hotel and other water systems and in water used for air conditioning or air cooling system. Hence the main intervention against the condition is prevention, through control of the organism in water systems. The European standard CEN/TR 16355 gives recommendations for good practice concerning the prevention of Legionella growth in drinking water installations but existing national regulations remain in force. General recommendations "Conditions for Legionella growth". The following conditions encourage Legionella growth: • water temperature between 25 °C and 50 °C. To restrict the growth of Legionella bacteria, the water temperature shall be in a range that the bacteria will not grow or have minimum growth, wherever possible. Otherwise, it is necessary to disinfect a drinking water installation by means of a thermal treatment; • stagnation of the water. To avoid long periods of stagnation, the water in every part of the drinking water installation should be used or flushed at least weekly; • 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. No circulation of hot water Table 2 - Types of hot water installation Hot and cold water separately Mixed hot and cold water No storage Storage No storage upstream of mixing valves Storage upstream of mixing valves With No circulation With No circulation With No circulation With circulation circulation of of hot water circulation of of hot water circulation of of mixed of mixed water hot water hot water hot water water No storage upstream of mixing valves No circulation of mixed water With circulation of mixed water Rif. In Allegato C C.1 C.2 C.3 C.4 C.5 C.6 C.7 C.8 C.9 C.10 In the ≥ 50°C Thermal Thermal In the storage e Thermal Temp. - ≥ 50°C e storage water ≥ 50°C e Thermal disinfection heater a d disinfection d water heater a disinfection disinfection d d Thermal disinfection d Ristagno - ≤ 3 l b - ≤ 3 l b - ≤ 3 l b - ≤ 3 l b - ≤ 3 l b Sedimento - - Remove C Remove C - - Remove C Remove C - - 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. 7.7]. 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. 21

7. INSTRUCTIONS FOR USE 7.1 Control panel description Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER 1 2 3 AA NiMh 2100mAh min. RECHARGEABLE 4x AA NiMh 2100mAh min. RECHARGEABLE mode 1 1 Batteries support 2 Display 3 ON/OFF 4 Knob/set button 5 Led 4 5 6 6 MODE 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, while in bottom section other specific indications such as the operation mode signal, fault codes, settings and information of the product’s condition. 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 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. 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, for activation set the P8=1 or P8=3 and select “Auto” with mode button. 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. 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. • 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 visualise the number of days that remain until the product’s reactivation. Once this time has elapsed, the unit 22

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