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NUOS Plus - User Manual

  • Text
  • Appliance
  • Heater
  • Heating
  • Installation
  • Operating
  • Discharge
  • Maintenance
  • Electrical
  • Technical
  • Regulations
  • Nuos
  • Manual

Heat pump water heater -

Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER P6 parameter - Silent This function reduces the sound level (performance can vary from those declared). It can be enabled via the P6 parameter on the installer's menu. When enabled, the image to the right appears on the display. P8 parameter (for details see paragraph 7.4) The P8 parameter allows you to manage the product's different operating modes. It can have values of 0, 1, 2, 3. STANDARD (value 0 - default): only the GREEN, BOOST, VOYAGE (if enabled with P3) and PROGRAM (if enabled with P4) modes can be selected with the “mode” button; the integration is by the electric heating element that operates according to the mode selected. HE_ON (value 1): the GREEN, AUTO, BOOST, BOOST2, VOYAGE (if enabled with P3) and PROGRAM (if enabled with P4) modes, i.e. all available modes, can be selected with the “mode” button; the integration is by the electric heating element that operates according to the mode selected. COMBI (value 2): only the GREEN, VOYAGE (if enabled with P3) and PROGRAM (if enabled with P4) modes can be selected with the “mode” button. Integration to the heat pump is not provided; the electric heating element always operates in the event of anti-Legionella and antifreeze. It is advised to perform a pre-heating of inlet water to combi boiler made by the heat pump (refer to picture on the side). SYSTEM (value 3): the GREEN, AUTO, BOOST, BOOST2, VOYAGE (if enabled with P3) and PROGRAM (if enabled with P4) modes, all available modes can be selected with the “mode” button; the integration is by the external auxiliary heat generator where it is correctly connected both hydraulically and electronically (see paragraph 4.5) to the product. It is advised when it is available auxiliary heat generator which is able to replace the electrical resistance for integration function (only for 250I models). P9 parameter - Photovoltaic function If you have a photovoltaic system, you can set the product to optimise use of the electricity produced. After having done the electrical connections as described in paragraph 4.5 and set the P9 parameter to other than 0, when the SIG2 signal is detected, the current operating mode is automatically modified as follows: STANDARD (value 0 - default): the operating mode of the previously described procedures is not modified. PV GREEN (value 1): the PV icon is displayed (see figure to the side). When the signal from the inverter is present, the name of the selected mode alternates with the text PV GREEN. The product will reach the set temperature (the most between T SET POINT and T W PV), with only the heat pump (max 62°C). PV HE (value 2): the PV icon is displayed (see figure to the side). When the signal from the inverter is present, the name of the selected mode alternates with the text PV HE. The product will reach the set temperature (the highest between T SET POINT and T W PV), operating with only the heat pump up to 62°C and subsequently with the heating element (1500 W). PV BOOST (value 3): the PV icon is displayed (see figure to the side). When the signal from the inverter is present, the name of the selected mode alternates with the text PV BOOST. The product will reach the set temperature (the highest between T SET POINT and T W PV), operating both with only the heat pump and the heating element (1000 W) up to 62°C and subsequently with only the heating element (1500 W). There must be the SIG2 signal for at least 5 minutes to enable the photovoltaic function (once the product starts a cycle, it will operate for at least 30 minutes). If parameter P18 is active, function P18 is automatically deactivated when the photovoltaic function is activated. P18 parameter - SG function If you have an SG signal, you can connect the signal cable as described in chapter 4.5 and when the P18 function is enabled the SG icon will be displayed. Once you have received the SIG2 signal for at least 5 minutes (once the product starts a cycle, it will operate for at least 30 minutes), the name of the selected mode alternates with the text SG ON and the current operating mode is automatically modified by thermostating the product to the temperature set (the highest between T SET POINT and T W PV), operating with only the heat pump (max 62°C). If parameter P9 is active, function P9 is automatically deactivated when the SG function is activated. P19 parameter - Errors This is a read-only parameter that shows the history of the last 10 errors; it is accessible only by the technical assistance. The number (3 digits) indicates the occurred error code whilst the error number is represented in the lower string in chronological order (max 10 errors - the number 10 indicates the most recent occurred error). 7.8 Antifreeze function When the product is supplied with power and there is no hot water demand, if the water temperature in the tank goes below 5°C, the heater coil (1000 W) is activated automatically to heat the water to 16°C. With P8=3 the function is performed by the integrated circuit. 7.9 Defrost The defrost function is activated when the heat pump has been working for at least 20 minutes, the detected air temperature is below 15°C and the evaporator temperature is decreasing rapidly. When the defrost cycle is running, the icon to the side is displayed. 7.10 Number of showers available The icon to the side shows the estimated number of showers remaining, based on hot water availability. One shower is calculated as: 40 L at 40°C. Press the knob to view the value. 25

Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER 7.11 Errors diagnostics 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. If the product shows an error signal, switch the appliance off and then on with the ON/OFF button (without batteries); if the error signal persists, contact the technical assistance. CAUTION: Before intervening on the product by following the indications below, check the correct electrical connection of the components to the mainboard and the correct position of the NTC sensors in their seats. Error code 110 111 Before any maintenance operation: read carefully the checking procedures explained in the Technical Manual Cause Air/Evaporator/Compressor Inlet Temperature sensors; short circuit or open circuit Air/Evaporator sensor: decalibration Heating element operation ON Heat pump operation Encoding of heat pump circuit codes OFF 121 Gas issue ON OFF 131 Problem on compressor start-up capacitor What to do Check and eventually correct the assembly of sensors’ connector on the main board. Control the proper functioning of the sensors. ON OFF Control the proper functioning of Air and Evaporator sensors ON OFF 141 Fan issue ON OFF 142 Evaporator filter: obstruction ON OFF 143 High pressure drop in air ducts ON OFF 151 High pressure issue OFF OFF 171 181 Pressure transducer: open or short circuit Electronic expansion valve (EEV) problem High NTC sensor (hot water): 210 short circuit or open circuit Medium NTC sensor: short 220 circuit or open circuit Low NTC sensor (heating 230 element zone): short circuit or open circuit Low NTC sensor (heating 231 element zone): safety intervention (1st level) Low NTC sensor (heating 232 element zone): safety intervention (2nd level) ON ON ON ON OFF OFF OFF OFF OFF Control the proper functioning of the compressor inlet temperature sensor. If the error persists, recover the residual gas, find the leak in the cooling circuit and repair it; empty the cooling circuit and recharge with 1300 grams of coolant Check and eventually correct the wirings between: main board and compressor start-up capacitor, start-up capacitor and compressor, main board and compressor. Then control the voltage on the start-up capacitor and on the compressor power connector on the main board. Control power voltage on the fan connector. Control the proper functioning of the compressor inlet temperature sensor Clean the evaporator filter and the air ducts. Control the proper functioning of the compressor inlet temperature sensor. If the error persists, check compliance of the air duct specifications Check compliance of the air duct specifications. Control the proper functioning of the compressor inlet temperature sensor. If the error persists, clean the evaporator filter and the air ducts Recover the refrigerant, make the vacuum and charge 1300g of R134a. If the error persists, replace the pressure switch. Check and eventually correct the assembly of the pressure transducer connector on the main board. Check the proper functioning of the pressure transducer Check and eventually correct the assembly of the EEV coil connector on the main board. Check and eventually correct the positioning of EEV coil on the EEV. Encoding of domestic water circuit codes OFF ON OFF OFF OFF Check the correct assembly of the wirings on the sensor connector and on the main board. Control the proper functioning of the sensor. Control the proper functioning of the sensor Encoding of electronic circuit codes 310 ON/OFF repeated OFF OFF Wait 15 minutes before unblocking the product with the ON/OFF button 321 Mainboard issue OFF OFF 331 Mainboard-display wiring: no communication OFF OFF Reset the product by pushing the ON/OFF button twice. If the error persists, replace the component. Reset the product by pushing the ON/OFF button twice. If the error persists, replace the mainboard-display communication wiring 26

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