Installation And Servicing Instructions - Heatingspares247.com

WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25PExample:Air inlet uses twoone 92.5 o sweepelbows. Hence,maximum lengthpermissible (i.e. a+bin figure 2.8.2) =39.0m - 1.0m - 1.0m= 37.0mFlue outlet uses one92.5 o sweep elbow.Hence, maximumlength permissible(i.e. c+d in figure2.8.2 = 20.0m - 1.0m = 19.0mabAIRCelsius 25dFLUEc2.8.3 SlopeFigure 2.8.2 : Flue & Air Maximum Length Example'Horizontal' flue outlet pipework MUSTslope at least 2 degrees (32 mm permetre run) downwards towards theboiler. Pipework can be vertical. Onlyswept elbows can be used.Air inlet pipework can be trulyhorizontal or vertical, or sloping in adownward direction towards the boilerbut in this case rain, etc., must beprevented from entering the pipe.There must be no troughs in any ofthe pipework, whether it be air inletor flue outlet.To TerminalTo BoilerFigure 2.8.3 :Flue Condensate DrainPoint Example50mm Tee FittingDue the low temperature of the flue6 in min.gases further condensate will formwithin the flue system. Drain points,with suitable traps, must therefore beincorporated within the flue system atthe base of vertical flue sections in excess of 8m. These additional condensatedrains must be run to discharge as detailed in section 2.11. Such drain points canbe formed using standard muPVC fittings. Refer to the example in Figure 2.8.3.2.8.4 TerminationsAir inlet terminals must be facing horizontally or downwards to prevent entry ofrain into the terminal and positioned to ensure only fresh air is drawn into theboiler. The air terminal must be located outside of the building.Drawing of combustion air directly from a ventilated boiler room invalidates theheat exchanger warranty.Installation & Servicing Instructions Page : 12