Table of Contents
Advertisement
Pre-installation
Minimum extension length between elbows
The minimum extension length between two elbows/offsets is 130mm,
this allows for a good seal at the connection joints.
≥ 1 3 0 m
Fig. 11 Example with 90° elbows
3.1.2
Horizontal fixed flue length
The fixed flue is 1,000mm in length but this can be reduced if required
by cutting the fixed flue.
Reducing the fixed flue length
▶ Remove the securing screws [2] located each side, at the end of the
elbow [1] and separate the elbow from the fixed flue [3].
1
2
Fig. 12 Removing adaptor elbow from the fixed flue
Refer to figure 13
▶ Mark the length required from the raised tab [1] on the terminal end
down the length of the terminal section, minimum 330mm.
▶ Cut square, taking care not to damage the tubes, remove the
unwanted section [2], chamfer the edge of the plastic inner tube and
remove any burrs from both tube sections.
2
Fig. 13 Shortening the terminal assembly
8
m
4 0 m m
3
0010014892-001
1
m m
3 3 0
M i n
3.1.3
Reducing extension flue tube length
Flue extensions:
▶ Flue extension are available in 3 sizes, a 220mm, 1,000mm and
2,000mm lengths.
To shorten the flue extension tube:
▶ Mark the length required on the extension tube, measuring from the
socket end [1].
▶ Cut square, taking care not to damage the tubes, remove the
unwanted section [2], chamfer the edge of the plastic inner tube and
remove any burrs from both tube sections.
2
Fig. 14 Cutting an extension tube
3.1.4
Horizontal flues through pitched roofs
Whilst this is an acceptable method of installation, it is preferred that a
vertical flue terminal is used where possible through a pitched roof.
It is possible to install a horizontal concentric flue through a pitched roof
so long as the following criteria are met:
▶ Ensure the minimum distance of 300mm measured vertically
between the roof pitch and the flue terminal.
▶ Ensure no exposed flue joints are external to the roof flashing.
▶ The flue must be adequately supported to ensure a constant fall back
to the appliance at an angle of 3°, (52mm per metre).
– Supporting approximately every metre for example at flue joint
connections and any change of direction.
▶ Ensure that the terminal cannot be affected by a build up of snow etc.
▶ All flue terminal clearance must be kept as per appliance Installation
and maintenance instructions.
1
3
Fig. 15 Example horizontal flue through a pitched roof
[1]
Support bracket
[2]
Roof flashing
[3]
Flue joint
Greenstar Condensfit II – 6 720 874 391 (2019/04)
1
2
300mm
Advertisement
Table of Contents
