Installation procedure 8Vaillant Vantage 120/150/200 23• Connect the expansion vessel to the installed watercontrols by either:i. Screwing the vessel directly into the control assem-bly at the purpose provided connection (3, fig. 11) or,ii. Connecting the vessel to the control assembly viacopper pipe or a suitable approved flexible connec-tion hose, ensuring that the vessel is adequatelysupported.Note:An optional ”Remote Expansion Vessel MountingKit” (Art no. 2378083) is available for use withVANTAGE cylinders. The kit contains a wallmounting bracket and a 1 metre flexible connec-tion.• Connect the balanced pressure cold water supply (ifrequired) to the pressure limiting valve.Note:In areas where the mains water pressure is high(4 bar or above) the cold water supply to a bathor shower mixer valve can be taken from thebalanced pressure cold water outlet (2, fig. 11) ofthe cold water controls. This will ensure thatboth hot and cold supplies to the mixer valveare at approximately the same pressure. Thecold water supply for all other terminal fittingsshould be teed into the cold water supply pipe-work to the VANTAGE upstream of the coldwater controls.• Connect the DHW outlet pipework to the 22 mmdomestic hot water outlet on the VANTAGE (E, fig. 4).Continue with 22 mm size pipe to the first tee fittingafter which 15 mm pipework should be adequate.If the pipe runs are of excessive length or there areseveral terminal fittings supplied, extend the length ofpipework in 22 mm. (See 7.3: Secondary System.)8.3 Safety valve discharge pipework• Connect the temperature/pressure relief and expansi-on relief valves to the tundish and install the dischargepipework from the tundish in accordance with section7.5: Discharge Pipework.