Manual Morso 1452 (page 7 of 16) (English)

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1.9 Draft conditions

If smoke spillage occurs when the ﬁre door is opened, it is probably due to poor chimney

draft. This type of stove requires at least 12 pa of chimney draft to achieve satisfactory com-

bustion and smoke spillage prevention. However, in cases where the stove door is opened

too vigorously you could expect that slight smoke spillage may occur.

The smoke gas temperature at the rated output is 294˚ C relative to 20˚ C.

The smoke gas ﬂow is 5.43 gr/sec.

If you have any doubts, you may want to have your installer measure the draft in the chimney.

Draft conditions

The chimney’s draft is the resulting effect within the ﬂue caused by the differ-

ence in temperature within the ﬂue and the cooler temperature outside. Other

factors that can inﬂuence the level of draft include the length of the ﬂue, in-

sulation of the chimney, adverse weather conditions or tall buildings or trees

nearby the ﬂue terminal.

Poor draft occurs when:

• The atmospheric temperature difference is too low, e.g. a poorly insulated chim-

ney. If the chimney is excessively cool, it may help to ‘prime’ the ﬂue before the

ﬁre is lit. Just place a screwed-up sheet of newspaper in the ﬂue-ways of the sto-

ve and ignite.

• The outside temperature is too high, e.g. during the summer months.

• There is no air movement (wind) outside.

• The chimney is not tall enough, with the result that the terminal sits in the lee of

the roof surface or in the vicinity of tall trees or neighbouring buildings. These con-

ditions are also associated with downdraft where the ﬂue gases are pushed back

down the chimney.

• Flue draft is diluted by residual air entering the chimney, e.g. due to inadequate

ﬂue-pipe joints or leaks at the cleaning door or ﬂue collar.

• Unsealed, unused ﬁreplaces are connected to the chimney.

• The ﬂue is blocked, e.g. by soot, due to inadequate cleaning, loose debris or even

a birds nest.

• The house is too tightly sealed (see section on Fresh air supply).

A good draft is achieved when:

• The temperature difference between the chimney and outside is high. This also

applies during ﬁring, when the need is greatest.

• The weather is clear and there is a good wind.

• The chimney is of the proper height, i.e. minimum 4 meters over the stove and the

termination adequately clear of the roof line.

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Morso 1452 Usermanual and installation guide - German - 11 pages

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Morso 1452 Manual

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