16
Alpha CD90S/115S - Installation
4.6
'C' TYPE CONCENTRIC FLUE KITS
Convert the boiler from the factory supplied 'B23' type configuration to 'C' type, i.e. room sealed concentric flue by
removing the 80 mm dia. adaptor and four screws securing the fixing plate and gasket from the top of the boiler.
Horizontal through the wall concentric flue kit - see Figs. 19 and 20.
Fig. 19 shows the flue kit parts that need to be fitted to
the boiler to ensure the room sealed concentric flue
can be used.
To assemble the kit to the boiler - Fit the adapter into
the central flue outlet on the top of the boiler up to the
stop. Slide the square gasket over the adapter up to
the groove, then fix it to the cover by means of the
previously removed fixing plate and four screws. Fit the
male end of the flue elbow up to the stop on the
adapter. Place the outer seal over the concentric flue
pipe and slide it throught the wall from the outside.
Place the inner seal over the concentric flue pipe then
insert the pipe into the elbow up to the stop. Slide the
seals along the duct to seal it to the inside and outside
of the wall.
To install extensions or other flue components,
proceed as follows: fit the male end (smooth) of the
concentric pipe or concentric elbow up to the stop on
the female socket (with lip seals) of the previously
installed component, this will ensure a secure fit and seal of the joints.
Extensions for horizontal kit -
The horizontal kit can be extended up to a maximum horizontal distance of 10 m (CD90S)
or 14 m (CD115S) (Fig. 20), including the flue terminal and excluding the flue bend on the boiler (refer to Section 3.4).
Note:
To prevent condensate lying in the flue pipe, slope the pipe towards the boilers with a minimum slope of 3° (25 - 30 mm
per metre). When installing the extensions, a wall/ceiling mounted clamp must be installed every 1.5 metres.
Fig. 20
Fig. 19
Fig. 17
Fig. 18
Flue elbow
Flue pipe
Inner seal
Outer seal
160 mm
100 mm
80 mm
Note:
Ensure the flue slopes downwards towards
the boiler by a minimum of 25 to 30 mm per metre (2.5° to 3°)
Flue elbow
Fixing plate
Square gasket
Adaptor
Concentric flue pipe
Inner seal
Outer seal
190 mm
136 mm
9820 mm (CD90S), 6820 mm (CD115S)
Maximum 10 m (CD90S), 7 m (CD115S)
180 mm
Inner seal
Outer seal
Note: Ensure the flue slopes downwards towards
the boiler by a minimum of 25 to 30 mm per metre (2.5° - 3°)
