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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 8. MAINTENANCE (for authorized personnel) WARNING! Observe the general warnings and safety instructions listed in the previous paragraphs and strictly adhere to the indications therein contained. All maintenance operations and interventions should be performed by qualified personnel (i.e. with the necessary requirements as outlined in the applicable norms in force). After routine or extraordinary maintenance, we recommend filling the appliance's tank with water and draining it completely to remove any residual impurities. 8.1 Draining the appliance The appliance must be drained if left inactive in a room subject to frost. Typical drain arrangement and system designs will vary: 1. Turn power off to ensure Nuos is not operated when empity. 2. Turn off cold supply to Nuos. 3. Shut off hot water feed from Nuos. 4. Connect hose to drain cock and place other end in sink, basin etc. 5. Open drain cock and open TPR valve to vent cylinder. 8.2 Routine maintenance - Partial obstruction of the evaporator filter causes a reduction in product performance. We therefore recommend cleaning the filter to remove any dust or obstructions at least once a year. The filter can be extracted using the appropriate clip above the casings (lateral picture). Clean the filter with water and mild soap. - Check and clean canalizations and grills. - Verify that the external terminal of the air exhaust duct, and the duct itself, are not obstructed or have not deteriorated. - Ensure that the condensate water runs out in a suitable drain and make sure the discharge is made without hindrance. - Check operation of the electric heater element. - Check anode every year and replace as required depending on its deterioration – see 8.5. - Inspect the inside of the cylinder – see 8.6. - With the water supply turned off remove the strainer from the combination valve and clean off any debris and rinse in water. - Expansion vessel: with the water supply turned off and taps open, check the expansion vessel pressure and top us as necessary. - Cylinder TPRV: check its operation with the supply water on, turn the TPRV test knob and check water discharges totundish, ensure the valve closes after testing. - Combination valve PRV: check its operation with the supply water on, turn the PRV test knob and check water discharges totundish, ensure the valve closes after testing. - Discharge pipe (D1): open either TPRV or PRV gradually to produce a full bore discharge into bundish and D2 and check there is no back pressure and that the water flows freely to drain. - Pressure Reducing Valve (PRV): check that the correct outlet pressure is being maintained by measuring the pressure at an in-line terminal fitting e.g. a tap. 27

Water comes out cold or insufficiently warm Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER 8.3 Troubleshooting Problem Possible reason What to do Low temperature set Increase the temperature set for the outlet water. Device functioning errors Check for errors on the display and act in the way specified on the chart "Faults". No electrical connection, disconnected or Check the voltage at the supply terminals, verify the integrity damaged wirings and connections of the cables. Try to put the product in “Boost” mode, if is ok in this way, Absence of HC/HP signal (if the product is check the connection of the meter, check the integrity of the installed with the HC/HP signal cable) HC/HP cable. The water is boiling (with the possible presence of steam from the taps) Reduced functioning of the heat pump, semipermanent operation of the electrical resistance Insufficient flow of hot water Overflowing water by the the safety valve Increase of the noise Problems of visualization or display off Bad odor coming from the the product Abnormal or excessive consumption than expected Other Malfunctioning of the timer for two-tier rate (if the product is installed in this configuration) Check the operation of the contactor day / night and that the set time is enough to heat water. Insufficient air flow to the evaporator. Clean the grilles and ducts regularly. Product off Check availability of electricity, turn on the product. Usage of a large amount of hot water when the product is heating up phase. Probe error Control the presence, even if occasional E5. Turn off the power, drain the unit, remove the sheath of the resistance and remove lime scale inside the boiler, be careful High level of scaling of the boiler and not to damage the enamel of the boiler and the sheath components resistance. Repackage the product as in the original configuration, it is recommended to replace the flange gasket. Probe error Control the presence, even if occasional E5. Air temperature out of range Depending from the climatic conditions. “Time W” value too low Set a parameter for lower temperature or a longer unit of “Time W". Installation done not in accordance with Provide a proper Electric voltage. electric voltage (too low) Evaporator clogged or frozen Check the cleaning of the evaporator. Problems with the heat pump circuit Make sure that there are no errors on the display. Are not yet past 8 days by: -First Time instalation. -Change of the parameter Time-W. -No power from mains in absence of batteries or exhausted batteries. Verify that there are no leaks along the circuit, check Leaks or obstructions by the water circuit the integrity of the the deflector pipe, the integrity of incoming cold water pipe and hot water pipe. A drip of water by the device should be considered normal during the heating Presence of obstructive elements inside Components vibration Damage or disconnection of the wiring connecting electronic board and interface board No power from mains in absence of batteries or exhausted batteries. Absence of a siphon or siphon empty Loss or partial obstructions of the refrigerant circuit Bad environmental conditions or improper installation Partially clogged evaporator Incorrect installation If you want to avoid the drip, install an expansion vessel on the plant supply. If leakage continues during the period of no heating, check the calibration of the device and the pressure of the water network. Caution: Do not obstruct the hole for evacuation of the device! Check the components in movement, clean the fan and the other parts who can generate noise or vibrations. Check the components fixed with screws, be sure that the screws are tight. Check the integrity of the connection, check the operation of electronic boards. Check if there is electric mains supply and check the conditions of the batteries. Provide a siphon, with the proper quantity of water. Start your product in heat pump mode, use a leak detector for R134a to verify that there are no leaks. Check the cleanliness of the evaporator grid and ducts. Contact the technical support. 28

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