Installation Manual - Unical Lattner Condensing Hot Water Boilers

Instructions for the installer3.16 - WATER TREATMENTThe chemical/physical features of the heating system’s waterare fundamental for the boiler’s correct operation and safety.Among the inconvenients caused by the bad quality of thefeeding water, the most frequent and the most serious is theincrustation of the boiler thermal exchange surfaces.Less frequent, but also serious, is the hydraulic circuitsurfaces.It is ascertained that the boiler incrustations, due to their lowthermal conductivity, highly reduce the thermal exchange, evenif with a thickness of some millimetres and provoque a verydangerous localised overheating.We suggest to make the water treatment of the heating circuitin the following cases:a) When the hardness of the water is higher than 9 grains(15°f);b) For C.H. installations with large water content;c) Renewal of the water system due to uncontrolled leakages;d) Subsequent refilling of the system due to maintenanceworks on the installation;e) Presence of different metals in the hydraulic circuit.The scope of this treatment is finalized for eliminating orsubstantially reducing the following problems:- lime scale deposit- corrosion sludge- deposits- microbiological growths (moulds, bacteria etc.)An appropriate treatment of the supply water will preventthe above stated problems and will maintain the correctoperation and efficiency of the generator in time.For this purpose it will be necessary to fix the followingchemical-physical characteristics of the water:PH include between 6,5 and 8Hardness 6 ÷ 9 grains (9 ÷ 15 fr)Water hardnessWhen there is a water hardness of more than 6 to 9 grainshardness a water softener must be installed.SedimentIf there is sediment in your domestic water supply sedimentfilter or other suitable device should be used to remove it.THE INSTALLATION MUST BE FORESEEN ON THE RETURNPIPE OF THE PRIMARY CIRCUIT DOWNSTREAM OF THECIRCULATING PUMP.WARNING!All necessary precautions must be taken forpreventing the formation and localization ofoxygen in the system’s water. For this reason,ensure yourself that the plastic piping used inunderfloor heating systems is impermeableto oxygen.If any anti-freeze solutions are used ensure that they arecompatible with aluminium and any other boilercomponents and materials.WARNING!Any damage caused to the boiler due to theformation of lime scale or by corrosive waterwill not be covered by the warranty.WARNINGAppropriate steps must be taken to ensurethe indirect tank water heater does not becomeplugged by scale caused by hard wateror sediment.If the indirect tank water heater becomesplugged by either scaling from hard water ofsediment it is not the responsibility of LATT-NER.24