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Morso 6140 Manual

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1.7 Connecting to a brick chimney
Brick a ue bushing securely into the wall, and insert the ue pipe into it. The pipe must not
extend into the actual chimney opening, but only to the inside of the chimney aperture. The
joints between the stove/pipe and pipe/wall bushing must be sealed with glass tape. It is
not normally necessary to seal between any pipe joints.
If the ue pipe transitions from horizontal to vertical, it is a good idea to install it with a gentle
bend so as to avoid any loss of draught.
The ue pipe must be dimensioned in accordance with national and local regulations. Morsø
recommends, however, that ue pipes be made of 2 mm sheet steel as this will extend the
service life.
1.8 Connecting to a steel chimney
If your installation involves taking the chimney straight up and through the ceiling, you must com-
ply with National, Local Building Regulations or ue manufacturers instructions concerning clear-
ances to combustible materials such as walls, oor joists and ceilings. The joint between the stove
ue collar and the stovepipe must also be sealed using glass bre rope. It is important that the
insulated ue system is properly supported both at ceiling level and at roof level.
THE STOVE MUST NOT BEAR THE WEIGHT OF THE CHIMNEY SYSTEM (See chimney man-
ufacturer’s instructions). Excessive weight on the stove will inhibit expansion and could lead
to damage of the stove top. Damage caused to the stove in this way would not be covered by
the manufacturers guarantee.
If a chimney re should occur as a result of incorrect operation of the stove or prolonged
use of wet fuel, close the vents completely and contact the re brigade.
Be aware of the following:
Cleaning procedure: Discuss this with chimney sweep or qualied installer prior
to or during the stove installation.
Chimney draft: If the chimney draft is naturally poor it is better to install the ue from
the top of the stove so as to minimise any internal resistance of the ue gases.
Avoid having any more than 2 bends in the ue system and limit the length of the
oset between bends.
Fresh air supply
A wood-burning stove requires air for combustion. As a result, ring a wood-burn-
ing stove will help create a healthy climate in your house. If the house is very tightly
sealed, and particularly if there is a cooker hood or ventilation system in the house, it
may be necessary to install an air grate in the room in which the wood-burning stove
is installed. Otherwise there may not be enough draught in the chimney, which may
result in the stove not being able to burn properly, and smoke may come out of the
stove when the re door is opened.
If it is necessary to install air grates, they must be positioned so that they cannot
be obstructed.
1.9 Draught
If smoke comes out of the stove when the re door is opened, it will be due to the poor draught
in the chimney. This type of stove requires at least 12 PA of chimney draught to achieve satis-
factory combustion and to prevent smoke from escaping. Smoke may, however, escape in any
event if the stove door is opened during vigorous ring, so this should be avoided.
The ue gas temperature at the rated output is 281°C relative to 20°C.
If in doubt, you may want to get your chimney sweep to measure the draught in the chimney.
Draught
The draught in the chimney is the result of the dierence between the high tempera-
ture in the chimney and the cooler temperature outside. Other factors that determine
whether sucient negative pressure can be produced to create a draught include the
length and insulation of the chimney, and wind and weather conditions.
The draught will be reduced when:
- The temperature dierence is too low, e.g. in connection with a poorly insu-
lated chimney.
If the chimney is cold, it may help to light (burn up) a rolled-up newspaper in
the chimney’s cleaning door.
- The outside temperature is too high, e.g. during the summer.
- There is no wind.
- The chimney is not tall enough, with the result that it sits in the lee of the roof
surface or tall trees.
These conditions are also associated with the greatest risk of smoke coming
back down the chimney.
- Air is entering the chimney in undesired places, e.g. through cracked joints or
leaks in the cleaning door or the ue pipe.
- Unsealed, unused replaces are connected to the chimney.
- The ue pipe and chimney are clogged up with soot due to inadequate cleaning.
- The house is too tightly sealed (please see the section on Fresh air supply).
A good draught is achieved when:
- There is a big dierence between the temperature in the chimney and outside,
i.e. when the need for heating is greatest.
- The weather is clear and there is a good wind.
- The chimney is of the proper height, i.e. Minimum 4 metres above the stove,
and clear of the spine of the roof.
… 14 …


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