Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual Manual pdf 20 page image

7 Start-up20 Installation and maintenance instructions ecoTEC exclusive 0020193966_017.9 Flushing the heating installation for the firsttime ("cold")NoteThe complete heating system must be flushedat least twice: Once with cold water and oncewith hot water in accordance with the followinginstructions.1. Check whether all thermostatic radiator valves and bothservice valves on the product are open.2. Connect a hose to the drain valve that is located at thelowest position in the heating system.3. Open the radiator valves and the drain valves so thatthe water can drain quickly. Start at the next point in thesystem and open the purging valves on the radiators sothat the contaminated water can completely drain.4. Close the drain cocks.5. Refill the heating system with water.6. Check that the expansion relief valve of the heatingsystem is functioning correctly by turning the handleon the valve.7. Check the pressure in the heating system and top upwith water if necessary.8. Close the filling valve and the cold water valve.7.10 Filling the heating installation11. Flush the heating installation through.2. Select the check programme P.06.◁ The diverter valve moves to the mid-position, thepumps do not run and the product does not switchto heating mode.NoteThe cap on the automatic air vent (1) hasalready been opened at the factory.3. Observe the information on treating heating water.(→ Page 18)4. Check all connections and the entire system for leaks.5. Connect the filling and drainage tap in the heating in-stallation to a heating water supply, if possible with thecold water valve, in accordance with the relevant stand-ards.6. Open the heating water supply.7. Open all thermostatic radiator valves in the heating in-stallation.8. If necessary, check that both service valves on theproduct are open.9. Slowly open the filling and drainage tap so that the wa-ter flows into the heating system.10. Purge the lowest radiator until water flows out of thepurging valve without bubbles.11. Purge all other radiators until the entire heating systemhas been filled with water.12. Close all purging valves.13. Monitor the rising filling pressure in the heating installa-tion.14. Fill with water until the required filling pressure isreached.15. Close the filling and drainage tap and the cold watervalve.7.11 Purging the heating installation1. Select the check programme P.00.◁ The product does not start up, the internal pumpoperates intermittently and purges either the heatingcircuit or the hot water circuit.◁ The display shows the filling pressure of the heatinginstallation.2. Make sure that the filling pressure of the heating install-ation does not fall below the minimum filling pressure.– ≥ 0.08 MPa (≥ 0.80 bar)◁ At the end of the filling procedure, the filling pres-sure of the heating installation should be at least0.02 MPa (0.2 bar) above the counter-pressureof the expansion vessel ("Exp") (PInstallation ≥ PExp +0.02 MPa (0.2 bar)).3. If there is still too much air in the heating installation atthe end of the check programme P.00, repeat the checkprogramme.7.12 Filling the condensate trap11. Remove the lower section from the condensate trap (1).2. Fill the lower section with water up to 10 mm below theupper edge.3. Attach the lower section to the condensate trap.