Manual Morso 4143 (page 25 of 36) (English, Danish)

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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.

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 211°C relative to 20°C.

If in doubt, you may want to get your chimney sweep to measure the draught in the chimney.

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Morso 4143 Manual

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