Benchmark Alpha InTec 24X Installation And Servicing Instructions page 19

4.8 EXTENDING THE FLUE - Fig. 20
Note: The flue assem ly length must not exceed the maximum length stated, including the equivalent lengths of any
extensions, bends etc. used for plume management components. InTec boilers must not exceed the maximum of an
equivalent horizontal flue length of 12 m
1. When the flue length required is more than the maxi um stated in Section 4.6, paragraph 1, refer to the table below
and Figs 14 and 15.
Rear Flue length (B) Side Flue length (B + C)
Up to maximum:- Up to maximum:-
11.885 m 11.805 m
(Subtract 45 mm if the
wall jig is used)
Additional support brackets are required when extending the flu . 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 desc ibed in Section 4.6, paragraph 2 to determine the number of Alpha CD 750 or
1000 mm flue xtensions 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 assem ly 'TOP' where it is connected to the boiler, so that the 'TOP' of the flue te minal is
aligned with the 'TOP' at the boiler end of the flue assem ly.
7. Pass the complete flue assem ly 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 flu .
9. Slide the larger Easy-Flue 45 mm clamp (two screws) over the outer duct and pull the flue assem ly towards the bend,
locating the inner duct into the seal joint on the bend.
Ensure the inner duct within the terminal is at the top.
The inner duct must be positioned to slope towards the boiler
Note:
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 flu .
Refer to Section 4.8 for instructions on how to extend the flu .
Note: A 130 mm flue hole (127 mm core d ill) may be required in the wall.
This is when the extended flue is passed through the all.
Ensure outer flue duct of Easy-Flue is horizontal
Extension clamp
CD Easy-Flue
Inner seal joint
Flue length (L)
Fig. 20 - Side flu
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 InTec C and X - Installation
Easy-Flue 45 mm clamp
90° bend
Easy-Flue
40 mm clamp
and seal
Seal joint
45
Front of boiler
220
19