Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

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

5 Installation12 Installation and maintenance instructions ecoTEC sustain 0020253094_01Caution.Risk of material damage due to the gasleak-tightness test.At a test pressure of >11 kPa (110 mbar), gasleak-tightness tests may cause damage tothe gas valve.▶ If, during gas leak-tightness tests, youalso place the gas lines and the gas valvein the product under pressure, use a max.test pressure of 11 kPa (110 mbar).▶ If you cannot limit the test pressure to11 kPa (110 mbar), close any gas isolatorcocks that are installed upstream from theproduct before you carry out the gas leak-tightness test.▶ If, during gas leak-tightness tests, youhave closed the gas isolator cock that isinstalled upstream of the product, relievethe gas line pressure before you open thisgas isolator cock.Caution.Risk of material damage caused by corro-sionDue to non-diffusion-tight plastic pipes in theheating installation, air gets into the heatingwater. Air in the heating water causes corro-sion in the heat generator circuit and in theproduct.▶ If you use non-diffusion-tight plastic pipesin the heating installation, ensure that noair gets into the heat generator circuit.Caution.Risk of material damage due to heat trans-fer during soldering.▶ Only solder connection pieces if the con-nection pieces are not yet screwed to theservice valves.Caution.Risk of material damage caused bychanges to the connected pipes.▶ Only bend connection pipes if they havenot yet been connected to the product.5.1 Installation requirements5.1.1 Information on liquid gas operationIn the as-delivered condition, the product is preset for opera-tion with the gas group indicated on the identification plate.If you have a product that has been preset for operation withnatural gas, you must convert it to run on liquid gas. You willneed a conversion kit for this. The conversion procedure isdescribed in the manual supplied with the conversion kit.5.1.2 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.5.1.3 Using the correct type of gasUsing the incorrect type of gas may cause fault shutdowns inthe product. Ignition and combustion noise may occur in theproduct.▶ Only use the gas type listed on the identification plate.5.1.4 Required preliminary work1. Make sure that the existing gas meter is capable ofpassing the rate of gas supply required.2. Install a system separator (to be provided on-site) dir-ectly on the cold water connection for the combinationunit.3. Check that the volumetric capacity of the expansionvessel is sufficient for the system volume.▽ If the volume of the expansion vessel is insufficientfor the system.▶ Install an additional expansion vessel in theheating return, as close to the product as pos-sible.▶ Install a non-return flap at the product's outlet(heating flow).4. Ensure that the system has the following components:– A cold water stop cock for the unit– A gas stopcock for the unit– A filling and draining device in the heating installa-tion