Morso UK 1630 Manuel d'utilisateur télécharger pdf (Page 7)

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 combustion

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 ﬂue gas temperature at the rated output is 361˚ C relative to 20˚ C. The ﬂue gas ﬂow is 8.9

gr/sec.

Draft conditions:

The chimney’s draft is the resulting effect within the ﬂue caused by the difference 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, insulation 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chimney.

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 stove 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ue-

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

• Unsealed,unusedreplacesareconnectedtothechimney.

• Theue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ap-

plies 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.

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

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Morso UK 1630 Manuel d'utilisateur Page 7