Baxi Combi 133 HE Plus Installation & Servicing Instructions Manual page 25

Wall Thickness
3°
(1 in 20)
X
Fig. 21
Waste
Fig. 22
© Baxi Heating UK Limited 2005
Support Bracket
360° Orientation
Edge of Support Bracket to
Y
Wall
Wall Thickness
(Y) = Left Exit
(Z) = Right Exit
(X) = Rear Exit
Flue
Inner Flue Support Bracket
8.6
Before fitting the flue, check the condensate drain
integrity (see section 8.5).
IMPORTANT: The flue should always be installed
with a 3° (1 in 20) fall from terminal to elbow, to
allow condensate to run back to the boiler.
HORIZONTAL FLUE
1. The standard flue is suitable for lengths 270mm
minimum to 800mm maximum (measured from the edge
of the flue elbow outlet).
Rear Flue: maximum wall thickness - 614mm
Side Flue: maximum wall thickness - Right Hand 462mm,
Left Hand 537mm when installed with minimum side clearances of
5mm.
2. For rear exit - measure the wall thickness
(Fig. 21) and to this dimension add 201mm. This
dimension to be known as (X).
i.e. (X) = wall thickness + 201mm
3. Take the flue and mark off (X) from the terminal end
as indicated in the diagram (Fig. 22).
Check your dimensions.
The flue tubes are fixed together. Cut through both tubes
whilst resting the flue on the semi-circular packing pieces.
Deburr both tube ends.
4. For left hand exit - measure the distance from the
edge of the support bracket to the inner face of the wall
(Fig. 21) and to this dimension add the wall thickness +
268mm. This dimension to be known as (Y).
i.e. (Y) = support bracket to wall + wall thickness +
268mm
5. Take the flue and mark off (Y) from the terminal end
as indicated (Fig. 22).
6. For right hand exit - measure the distance from the
edge of the support bracket to the inner face of the wall
and to this dimension add the wall thickness + 343mm.
This dimension to be known as (Z).
i.e. (Z) = support bracket to wall + wall thickness +
343mm
7. Take the flue and mark off (Z) from the terminal end
as indicated (Fig. 22).
Check your dimensions.
The flue tubes are fixed together. Cut through both tubes
whilst resting the flue on the semi-circular packing pieces.
Deburr both tube ends.
Fig. 23
IMPORTANT: Check all measurements before
cutting. When cutting ensure the cut does not
interfere with the inner flue support bracket
(Fig. 23).
8.0 Installation
Fitting The Flue
25