Installation Manual - Unical Lattner Condensing Hot Water Boilers

Instructions for the installer3.9 - FLOW AND RETURN PIPE CONNECTIONSNOTICEWhen using plastic pipes, observe the supplier’sinstructions especially those referring to recommendedjointing techniques and the notes relatingto the heating system water.NOTICETo prevent contamination in the heating systemwe recommend you integrate a dirt filter in thereturn pipe, near the boiler. In an old system it isa requirement to install a dirt filter. Also installshutoff valves to enable filter cleaning immediatelyupstream and down stream of the dirt filter(scale cartridge or y-strainer).When determining the size of the CH circuit pipes it isessential to bear in mind the pressure losses induced by anyof the system’s components and by the configuration of thesame system.WARNING!Ensure yourself that the system’s piping is notused as the earth clamps for the electrical ortelephonic system. They are absolutelyunsuitable for this use. In a short time this couldcause serious damage to the piping, boilerand radiators.NOTICEThe pipe to be connected to the boiler must becleaned before connecting in order to preventdirt from entering and damaging the boiler.WARNING!IT IS ABSOLUTELY FORBIDDEN TO FIT ON-OFFVALVES ON THE GENERATOR TO THE FOREOF THE SAFTEY DEVICESThe route of the piping has to be conceived taking all thenecessary precautions in order to avoid air locks and tofacilitate the continuous purging of the system.- Connect CH flow pipe to the Supply connection makingsure it is not under stress. Use a supply pipe with a minimumdiameter of 3’’ (80 mm)- Connect the return pipe with a fiat rubber seal installed tothe Return connection making sure it is not under stress.Use a return pipe with a minimum diameter of 3’’ (80 mm).WARNING!Before installing the boiler we recommendthat the system is flushed out with a suitableproduct, in order to eliminate any metallictooling or welding residues, oil and grimewhich could reach the boiler and affect theproper running of the boiler.20