Care and maintenance 50020258609_00 ecoVIT exclusiv Operating instructions 115.3.2 Filling the heating installationCaution.Risk of material damage due to heatingwater that is extremely calciferous or cor-rosive or contaminated by chemicals.Unsuitable tap water damages the sealsand diaphragms, blocks components in theproduct and heating installation throughwhich the water flows and causes noise.▶ Only fill the heating installation with suit-able heating water.▶ In case of doubt, ask a competent personfor details.1. Ask a competent person where the filling cock is loc-ated.2. Connect the filling cock to a hot water supply in the wayyou were told by the competent person.3. Open all radiator valves (thermostatic radiator valves) ofthe heating installation.4. Open the hot water supply.5. Slowly open the filling cock.6. Fill it with water until the required filling pressure isreached.7. Close the hot water supply.8. Purge all radiators.9. Then check the filling pressure on the display.10. Top up with more water if necessary.11. Close the filling cock.5.4 Checking the condensate discharge pipeand tundishThe condensate discharge pipe and tundish must always bepenetrable.▶ Regularly check the condensate discharge pipe and tun-dish for faults and, particularly, for blockages.You must not be able to see or feel any obstructions in thecondensate discharge pipe and tundish.▶ If you notice a fault, have it eliminated by a competentperson.5.5 Carrying out the flue gas analysisNoteMeasurement and inspection work must only becarried out by the chimney sweep or competentperson.2 11 + button 2 − button1. Switch on the chimney sweep function by pressing the− and + buttons for the DIA system at the same time.◁ Shown in the display: S.Fh = Heating chimneysweep mode; S.Fb = Domestic hot water chimneysweep mode◁ The product now works at maximum load for 15minutes. If you do not press any buttons for 15minutes or if a flow temperature of 85 °C is reached,the chimney sweep function is automaticallyswitched off.2. Take the measurements at the earliest after threeminutes of the product operating.Applicability: VKK 226/4, VKK 286/4, VKK 366/4▶ Remove the upper casing (→ Installation instructions).▶ Use the test points that are underneath for the meas-urement (→ Installation instructions).Applicability: VKK 476/4, VKK 656/4121 Flue gas test point 2 Fresh air test point▶ Use the test points on the adapter for the measure-ment, as shown.3. Unscrew the sealing cap from the flue gas test point (1).4. Remove the sealing cap from the combustion air testopening (2).5. Take the measurements in the flue gas route at the fluegas test point.