Atmos Energy InterCombi HE32 User Manual download pdf (Page 31)

5.6.7 Plastic twin pipe flue systems

NOTE Consult Atmos for these systems. Use of non-approved flue systems will invalidate the guarantee.

For special applications, the appliance can be used with plastic flue pipes, which are available from Atmos as follows:

PPS. This is a rigid translucent plastic pipe in 60mm and 80mm diameters, together with a range of fittings. This is suitable for

continuous use at 120ºC and is therefore suitable for connection from the appliance to the flue terminal. This must include the

80mm PPS pipe with flue gas test point, which is required for commissioning of the boiler.

PPS Flexible. This is a flexible pipe 80mm diameter which can be used for chimney linings, or for difficult vertical runs. Note

that it must only be used vertically and MUST NOT be used for horizontal runs because the condensate will accumulate and

could block the flue path.

Plastic combustion air inlet systems: All plastic pipes can be used for air inlet. The pipe does not need to slope since there is

no condensate.

NOTE: In longer runs of 80mm plastic flue pipe – 3m long or longer – it is advisable to fit a condensate drain in the flue pipe

to facilitate the draining away of condensate before it reaches the alluminium parts of the flue system or the boiler itself. This is

to prevent excessive corrosion. Atmos can supply a condensate drain-off fitting for 80mm flue pipe. It incorporates a flue test

point and it needs to be fitted into a vertical section of the flue. The condensate drain-off fitting allows connection to solvent

weld overflow pipe. A trap must be fitted into the condensate drain to prevent flue gases escaping.

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Atmos Energy InterCombi HE32 User Manual Page 31