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5.8
EXTENDING THE FLUE - Fig. 5.11
Note:
The flue assembly length must not exceed the maximum length stated, including the equivalent lengths
of any extensions, bends etc. used for plume management components. E-Tec boilers must not exceed the
maximum of an equivalent horizontal flue length of 12 m.
All joints between flue sections should be connected using the clamps provided. It is not required to add
additional screws through the clamps and into the flue sections.
1.
When the flue length required is more than the maximum stated in Section 4.6, paragraph 1, refer to the table below
and Figs 5.5 and 5.6.
Rear Flue length (B)
Side Flue length (B + C)
Up to maximum:-
Up to maximum:-
11.890 m
11.805 m
(Subtract 45 mm if the
wall jig is used)
Additional support brackets are required when extending the flue. These are available from Alpha, Part No. 6.1000355.
2.
Use the template (supplied with the boiler) to mark the required flue position, ensure the slope towards the boiler is correct.
3.
Determine the overall flue length as described in Section 5.6, paragraph 2 to determine the number of Alpha CD 750 or
1000 mm flue extensions required.
4.
Assemble the flue extensions together by locating the inner duct into the seal joint and secure each extension together
with the extension clamps supplied (three screws). Ensure that the clamps are positioned centrally over the joints.
Note: If it is required to cut an extension, DO NOT cut the end of the inner duct that incorporates the seal joint. Ensure
the inner duct end without the seal joint is cut so that it is 20 mm longer than the outer duct.
Ensure that all cuts are square and free from burrs.
Once assembled with the components pushed home, the flue is fully sealed.
5.
Adjust the telescopic section of the Easy-Flue to the required length and secure the Easy-Flue with the sealing tape
supplied. Fit the Easy-Flue to the extensions by locating the inner duct into the seal joint and secure with the clamp
(three screws), ensuring it is located centrally over the joint.
6.
Mark the end of the flue assembly 'TOP' where it is connected to the boiler, so that the 'TOP' of the flue terminal is
aligned with the 'TOP' at the boiler end of the flue assembly.
7.
Pass the complete flue assembly through the wall.
8.
Position the smaller Easy-Flue 40 mm clamp (with seal) supplied, over the bend. Fit the bend to the boiler and rotate to
the correct position and secure in position. Ensure the seal is located centrally over both the bend and boiler adaptor. If
the inside sealing collar (white) is being used to make good the inside wall, then it will need to be fitted before assembling
the flue.
9.
Slide the larger Easy-Flue 45 mm clamp (two screws) over the outer duct and pull the flue assembly towards the bend,
locating the inner duct into the seal joint on the bend.
All joints between flue sections should be connected using the clamps provided. It is not required to add additional
screws through the clamps and into the flue sections.
Ensure the inner duct within the terminal is at the top.
Note:
The inner duct must be positioned to slope towards the boiler
120
20
Terminal
Flue sealing
collar
Comments
Alpha CD 750 mm flue extension (Part No. 6.2000750) or 1000 mm extension
(Part No. 6.2001050) is required to extend the range of telescopic flue.
Refer to Section 4.8 for instructions on how to extend the flue.
Note: A 130 mm flue hole (127 mm core drill) may be required in the wall.
This is when the extended flue is passed through the wall.
Ensure outer flue duct of Easy-Flue is horizontal
Extension clamp
CD Easy-Flue
Inner seal joint
Flue length (L)
Fig. 5.11 - Side flue
Ensure the flue extension slopes
downwards towards the boiler by a
minimum of 25 - 30 mm per metre
Inner seal joint
CD Flue extension
125
Alpha E-Tec Plus 28, 33 and 38 - Installation
Easy-Flue 45 mm clamp
90° bend
Easy-Flue
40 mm clamp
and seal
Seal joint
45
220
Front of boiler
23
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