Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

Also see for ecoTEC sustain 24: Operating instructions Installation and maintenance instructions

0020253094_05 ecoTEC sustain Installation and maintenance instructions 197 Installation7.1 Preparing for installation▶ Make sure that the existing gas meter is capable ofpassing the rate of gas supply required.▶ Consider the maximum heat output given in DHW mode.▶ Install a system separator (to be provided on-site) directlyon the cold water connection for the combi boiler.▶ Install the following components:– Draining cocks at the lowest points in the heatinginstallation (→ current version of "BS 2879")– A stopcock on the cold water connection– A stopcock in the gas pipe▶ Check that the volumetric capacity of the expansion ves-sel is sufficient for the system volume.▽ If the volume of the expansion vessel is insufficientfor the installation.▶ Install an additional expansion vessel in the heat-ing return, as close to the product as possible.▶ Install a non-return flap at the product's outlet(heating flow).▶ Install the connection pipes such that they are free frommechanical stress.▶ If you use non-diffusion-tight plastic pipes in the heatinginstallation, ensure that no air gets into the heat gener-ator circuit.▶ Only solder connectors if the connectors are not yetscrewed to the service valves.▶ Only bend connection pipes if they have not yet beenconnected to the product.▶ Flush the heating installation thoroughly before installingthe product.▶ Check the leak-tightness of the gas valve assembly usinga pressure of ≤ 11 kPa (110 mbar).7.2 Information on the gas groupIn the as-supplied condition, the product is preset for opera-tion with the gas group indicated on the data plate.7.3 Purging the liquid gas tankIf the liquid gas tank is not purged properly, this may result inignition problems.▶ Ensure that the liquid gas tank has been purged properlybefore installing the product.▶ If required, contact the filler or the liquid gas supplier.7.4 Using the correct gas typeUsing the incorrect gas type may cause fault shutdowns inthe product. Ignition and combustion noise may occur in theproduct.▶ Only use the gas type listed on the data plate.7.5 Descaling the waterScale deposition increases as the water temperature in-creases.▶ Descale the water as required.7.6 Gas family checkMake sure that the product is set up correctly by checkingthe gas type. This ensures optimum combustion quality.▶ Check the gas type as part of routine product mainten-ance work when replacing components or carrying outwork on the gas route.7.7 Gas and water connections123451 Heating flow connec-tion, G3/42 Hot water connection,G3/43 Gas connection, G1/24 Connection for the coldwater supply line, G3/45 Heating return connec-tion, G3/41. Connect the water and gas connections in accordancewith the applicable standards.2. Purge the gas pipe before start-up.3. Check whether the connections are leak-tight.4. Check the entire gas pipe properly for leak-tightness.7.8 Connecting the condensate discharge pipemin.18012▶ Follow the instructions listed here and observe directivesand local regulations on condensed water discharge.▶ Use PVC or another material that is suitable for drainingthe non-neutralised condensed water.▶ If you cannot guarantee that the materials from which thecondensate discharge pipe is made are suitable, install asystem to neutralise the condensate.