Flexicom cx combination boiler - installation and service manual

10 Telescopic Flue - Length, Preparation and Installation10.1 Flue LengthThe maximum permissable horizontal flue length is 8 metresplus the flue terminal assembly, this can be achieved by useof the accessories, see diagram 10.3.However should an additional 87.5º or 2 x 45º elbows be usedthen the length MUST be reduced by 1metre.The diagram 10.1 shows the length achievable by using thekit A2043600.When extension pipes are used the flue system must bedesigned to have a continuous fall to the boiler of at least 2.5º44mm/metre to allow condensate to run back into the boilerand out via the condensate drain.The flue can be installed from inside the building, whenaccess to the outside wall face is not practicable.Multiple Boiler Chimney Flue LengthThe flue length must be calculated and installed according tothe relevant standards EN 13384-1 and 2 (C43 flue systemsonly) with reference to the table below and the manufacturersinstructions supplied.The appliance maximum flue length must be included whencalculating the overall design of the flue system.NOTE: The horizontal flue terminal must be removed, seediagram 10.2.Horizontal Telescopic Flue - RearHorizontal Telescopic Flue - Side1393414004Diagram 10.1Exhaust mass rate (g/s)At Min ThermalLoad (40C°/30°C)At Max ThermalLoad (80C°/60°C)Exhaust temperature (ºC)At Min ThermalLoad (40C°/30°C)At Max ThermalLoad (80C°/60°C)Flexicom24cxFlexicom30cxFlexicom35cx4.30 4.30 4.3011.67 14.10 16.3933.2 33.2 36.073.3 87.4 86.021