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Pre-installation
3
Pre-installation
CAUTION:
Flue joints and cut sections
▶ Secure all joints with the screws supplied in the appropriate flue kit
and accessory.
The sole purpose of the screws is to ensure that a correctly
assembled joint cannot become separated due to external
influences. They are not intended to provide any mechanical strength
or support.
▶ A hole must be pre-drilled in the outer flue using a 3mm drill-bit
wherever a screw is be used to secure a joint. The joint may not be
properly secured if the outer flue is not pre-drilled. Ensure you do not
accidentally drill the plastic inner flue.
▶ When cutting sections, always take care not to damage the tubes,
chamfer the edge of the plastic inner tube and remove any burrs from
both tube sections to assist in ease of connection and to prevent seal
damage.
Flue joints fixing screws
▶ Whenever possible, two screws should be fitted, at 180° from each
other on the flue connections, however we recognise that some
installation may make it difficult to access the joint sufficiently to fit
two screws. On these occasions we would deem one screw to be
acceptable.
▶ Where only one screw is used, the screw must be in a visible position
for inspection purposes.
▶ Whenever a flue is identified to have only one screw in each joint,
providing the flue is correctly supported and the screw is only being
used for its intended purpose to prevent the joint from separating and
not for mechanical support, then this would be acceptable.
Maximum flue lengths:
▶ For maximum flue lengths see the Installation and maintenance
instructions manual for the appliance the flue kit is being installed
onto.
3.1
Preparation
3.1.1
Flue measuring
NOTICE:
Flue and plume management length:
▶ Do not exceed the maximum straight length for a horizontal 60/
100mm flue or a 60mm plume management system (if used) as
stated in the relevant appliance Installation and maintenance
instructions manual.
The maximum flue length can be found in the Installation and
maintenance instructions manual for the appliance.
The horizontal fixed flue length can be reduced for an effective length L
of less than 1,000mm is required.
▶ Measure the flue length L from the centre line of the flue turret, along
the route of the flue system, to the face of the outside wall.
▶ Select the required number of extensions and elbows to achieve the
required flue run.
6
▶ If cutting is required:
– Where possible it is recommended to cut extensions rather than
the horizontal fixed flue.
50
Fig. 5
Flue length determination (extended flue example)
[L]
Effective length of the flue system
[R]
Actual length of the flue sections (L-50 = R)
[E]
Extension flue length
[F]
Fixed flue length (unmodified length of 1,000mm)
Effective length
▶ Each flue elbow is rated as a certain straight length of flue, refer to the
relevant appliance Installation instructions. The "effective length" of
each elbow is added to the straight length of flue. Adding elbows to
the flue system reduces the actual flue length available.
▶ The effective length of the flue must not exceed that stated in the
relevant appliance Installation and maintenance instructions manual.
90° Elbow offset dimensions
Figure 6 shows the offset between 2 x 90 ° elbows.
1
Fig. 6
90° elbows offset
[1]
299mm
[2]
185mm
[3]
190mm
Greenstar Condensfit II – 6 720 874 391 (2019/04)
11 0
2
3
0010013695-002
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