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Thermocet Trimline 120 -1037 Manual

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Page.11
7. CONCENTRIC FLUE SYSTEM CC
The concentric flue system consists of a 100mm or 130mm Ø inner flue concentric with a 150 mm or 200 mm Ø
outer flue. These flues have been set up concentrically; the combustion gases are exhausted through the internal
flue while the fresh combustion air is supplied between the internal and external flues.
7.1 Components of the concentric flue system. (See page 29,30 and 31)
Different connections are possible using the concentric flue system. These are:
Through the roof face and through the exterior wall.
There are various options for mounting the pathway for this system,
however, there are a few important requirements/conditions:
* The maximum allowable vertical flue length is 12 metres (the sum of the flue length and the calculation
lengths for the bends).
* 90° bends have a 2-metre horizontal calculation length.
* 45° bends have a 1-metre horizontal calculation length.
* The outlet can be installed at any point on the roof face or exterior wall (supply and discharge in an identical
pressure area), but must meet applicable regulations.
* Duct pathways may not be insulated
Important
* Ensure the restriction plate is mounted in the correct manner, as indicated in these instructions.
* The correct restriction plate will provide the unit with the most optimal efficiency, flame image and
combustion.
* Mounting an incorrectly placed restriction plate may cause malfunction of the unit.
7.2 Construction of concentric flue system CC
Indirect wall connection.
* The outlet may also be installed above the exhaust in the wall, taking any hindrance to the surrounding area
into consideration, according to national, regional, local standards and regulations. Ensure wind pressure on
the flue terminal is not too extreme, such as a balcony, flat roof, corners and in small alleys etc., as this may
negatively influence the unit efficiency.
* Provide a recess in the exterior wall of around 155 mm for concentric 100-150, and 205 mm for concentric
130-200. (in a flammable wall ensure there is 50 mm of extra space around the outer pipe and use
fireproof casing) and fix the exterior wall duct with the wall plate to the outer side of the wall. The wall
plate of the exterior wall duct must be sealed sufficiently against the wall on the outside, to avoid moisture
and/or flue gas leaks into the living space.
* The flue should be cased if necessary. Sufficient fireproof measures must also be taken when the flue is
being mounted along flammable materials.
* Determine the position of the unit and outlet and begin construction of the flue with the connection on the
unit, paying attention to the direction of installation and connecting the elements by means of clamp strips.
* The fitted pipe can be used between the bends or when connecting to the unit.
If necessary, use wall brackets to support the flue
Mounting using the roof pass-through option
* The flue terminal can be located at any random place on the roof face (supply and exhaust in identical
pressure areas) and must meet the applicable rules and regulations.
* A roofing sheet for a flat roof or a roofing sheet lead for sloping tiled roofs can be used for a watertight duct.
Use various bends for the slope, if required. The recess in the roof decking should be 5 cm larger all
around, to ensure sufficient fire resistance.
* One needs to take into account the regulation regarding fire resistance between rooms (See national,
regional, local standards and regulations). A casing made of fireproof material (e.g. 12 mm Promatect fire
resistant plate) must be used at 25mm from the outside duct.
* Determine the position of the unit and outlet and begin construction of the flue with the connection on the
unit (always 1 metre vertical first), paying attention to the direction of installation! The inner flue must be
installed for draining purposes. Connect the elements by using clamping strips. Ensure the gas tightness of
all connections is correct.
* A fitted pipe can be used between the bends or when making the connection to the unit and/or the roof pass-
… 11 …


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