Vaillant ecoFIT sustain 835 Operating Instructions Manual

Also see for ecoFIT sustain 825: Installation and maintenance instructions Installation and maintenance instructions Installation and maintenance instructions

4 Operation12 Operating instructions ecoFIT sustain 0020230530_014.10 Switching Comfort mode onand offNoteComfort mode immediately sup-plies hot water at the required tem-perature, without you having towait for the water to heat up.1. Press ( ).2. Press ( ).◁ Comf. on or Comf. off are shownflashing in the display.3. Activate or deactivate Comfort modeby pressing or .4. Press to confirm this change.◁ When you have activated Comfortmode, the symbol appears in thebasic display. When you have deac-tivated Comfort mode, the " " sym-bol goes out in the basic display.4.11 Switching off the product'sfunctions4.11.1 Switching off heating mode(Summer mode)1. To switch off heating mode withoutswitching off the hot water generation,press ( ).◁ The value of the heating flow tem-perature appears in the display.2. Use the button to set the heatingflow temperature to Off.3. Confirm by pressing .◁ Heating mode is switched off.◁ The symbol appears in thedisplay.4.12 Guaranteeing the correctfilling pressure of the heatingsystem4.12.1 Checking the filling pressureof the heating installationNoteTo ensure that the heating installa-tion operates smoothly, the fillingpressure when the heating install-ation is cold must be between0.10 MPa and 0.20 MPa (1.0 barand 2.0 bar) or lie between thetwo dashed lines in the bar graphdisplay.If the heating installation extendsover several storeys, a higher fillingpressure may be required for theheating installation. Ask a compet-ent person for details.In addition, the symbol appearsafter approx. one minute.If the filling pressure in the heatinginstallation falls below 0.05 MPa(0.5 bar), then the product switchesoff. The display alternates betweenthe fault message F.22 and thecurrent filling pressure.1. Press twice.◁ The values for the current fillingpressure and for the minimum andmaximum filling pressures appear inthe display.2. Check the filling pressure in thedisplay.1 / 2System pressure: 0.10 … 0.20 MPa(1.00 … 2.00 bar)The filling pressure is in the intendedpressure range.2 / 2Filling pressure: < 0.08 MPa(< 0.80 bar)