Vaillant ecoTEC SERIES Instructions For Installation And Servicing

Also see for ecoTEC plus 612: Instructions for use Installation and maintenance instructions Instructions for use Installation and maintenance manual Instructions for installation and servicing

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Vaillant ecoTEC SERIES Instructions For Installation And Servicing Manual pdf 16 page image

16 Instructions for installation and servicing ecoTEC 839592_12Total heatingoutputTotal hardness at 20 l/kWfor the smallest boiler heatingsurface 2)Total hardness at > 20 l/kW< 50 l/kW for the smallest boilerheating surface 2)Total hardness at > 50 l/kWfor the smallest boiler heatingsurface 2)kW mol/m 3 mol/m3 mol/m 3< 50 No requirement or < 3 1) 2 0,02> 50 to ≤ 200 2 1,5 0,02> 200 to ≤ 600 1,5 0,02 0,02> 600 0,02 0,02 0,021) with systems equipped with wall-hung boiler and systems with electric heating elements2) of the specific system volume (nominal capacity in litres/heating output; in case of multiple boiler systems the lowest individualheating output should be used)These data only apply up to 3x the system volume for filling and top-up water. Once this triple system volume is exceeded, thewater will have to be treated exactly the same as in case of exceeding the limit values given in Table 3.6 (softening, desalination,hardness stabilisation and desludging).Table 3.5 Guidelines for the heating water: Water hardnessHeating waterqualities Unit Low-salt salineElectric conductivityat 25 °C μS/cm < 100 100-1500Appearance Free of sedimentary substancespH-value at 25 °C 8,2-10,0 1) 8,2-10,01)Oxygen mg/L < 0,1 < 0,021) With aluminium and aluminium alloys, the ph value range isrestricted from 6.5 to 8.5.Table 3.6 Guidelines for heating water: SalinityCaution!Aluminium corrosion resulting in leakagescaused by unsuitable heating water!Unlike materials such as steel, cast iron or cop-per, aluminium is reactive to alkalised heatingwater (pH-value > 8,5) which results in signifi-cant corrosion.With aluminium, ensure that the pH value ofthe heating water ranges between 6.5 up to amaximum of 8.5.Caution!Risk of material damage if the heating water istreated with unsuitable frost or corrosion pro-tection agents!Frost and corrosion protection agents maycause changes in the seals, noises during heat-ing and possibly subsequent damage.Do not use any unsuitable frost or corrosionprotection agents.3.10.3 Pressure relief valveA pressure relief valve is provided with the boiler. Thissafety device is required on all sealed C.H. systems andis preset at 3 bar and provided with a 15 mmcompression connection for a discharge pipe, whichmust be of no less than 15 mm in diameter. The pressurerelief valve must not be used for draining purposes.3.10.4 Pressure gaugeThis is factory fitted to the boiler and indicates theprimary circuit pressure to facilitate filling and testing.3.10.5 Expansion vesselecoTEC boilers incorporate a 10 litre expansion vesselwhich is suitable for a sealed heating system with amaximum water content of 100 litres.If the nominal capacity of the built in expansion vessel isnot sufficient for the heating system (for instance incase of modernisation of old open systems) anadditional expansion vessel can be installed external tothe boiler. It should be fitted in the return pipe as closeas possible to the boiler in accordance with BS 5449:Part 1.Guidance on the sizing of an additional expansion vesselis given in Table 3.7.3 General requirements