If the chimney is too short, leaks, or is inadequately insulated, there may be problems with the chimney draft
(let the chimney sweep assess this). The draft should be sufficient during the ignition phase when the
stove/chimney is cold to provide a clean combustion and prevent smoke leakage. Therefore, we recommend
a chimney draft around 5 Pa in the ignition phase.
Once the ignition is a success and the smoke temperature is rising, it is important that the chimney draft
reaches a stable area around 18-25 Pa in operation (1 hour after ignition) when the chimney/stove is hot.
The draft in the area of 18-25 Pa when the stove is hot is essential in order to achieve an optimum and clean
combustion and avoid problems such as pellet accumulation and smoke leakage. Therefore, we recommend
that you measure your chimney draft when the chimney is cold and when it is hot after 1 hour in operation.
In practice, the chimney draft will differ
– especially in cold condition. Therefore, the best indication of the
chimney draft is to measure the draft when it is hot. If the chimney sweep judges the draft to be sufficient, but
you still have problems lighting a fire in “wood mode”, try extending the fire lighting phase by using more thin
pieces of kindling and 1-2 firelighters, so that the chimney gets thoroughly warm. The chimney will not draw
at optimum effect until it is warm. When a layer of embers has been formed, add 2-3 dry logs.
When in "pellet mode", the stove will not be able to ignite and instead give the alarm “failed ignition” if there
is not enough chimney draft in the ignition phase. In this case, you can reset the alarm and try again. If the
stove still does not turn on, you can heat the chimney by manually igniting the stove with sticks/woods as
described above - and then start "pellet mode" afterwards. If it is impossible to establish a sufficiently natural
chimney draft, the chimney can be fitted with a smoke exhauster, e.g. Aduro DraftOptimizer.
4.2 Chimney and Smoke
If you experience smoke coming out of the stove or the start section of the smoke pipe, it could be due to
certain weather conditions. On stormy or cold winter days or if the chimney has not been used in a while, a
cold plug can be created in the chimney, meaning the natural draft will be at its minimum.
If the chimney is cold and cold plugs are created, you may experience smoke leaks during the ignition and
startup phase. In this situation there can be more smoke than usually in the combustion chamber and some
of it might leak out of the stove. Therefore, if you have a cold chimney that has not been used for a while, we
recommend that you use some wood sticks to heat the chimney and eliminate the cold plug before turning
the pellet function on.
4.3 Draft and pellet combustion
The pellet combustion is affected by the draft in the chimney. If necessary, it is important to reduce or
improve the draft with a damper in the chimney or with a smoke exhauster, e.g. Aduro DraftOptimizer, if the
draft is too high or insufficient.
You can connect Aduro DraftOptimizer to Aduro H1 & H3 LUX and control it automatically to ensure optimum
draft. For further information, go to
Aduro Hybrid has certain standard settings when it comes to the speed of the auger and the fan, and in order
to achieve the most efficient / clean pellet combustion, it may sometimes be necessary for the user to adjust
these settings to customize the stove to their own installation such as chimney, smoke pipe, external factors
from the outside etc. If you're interested in knowing more about the app's features/functions, calibration, and
various FAQ’s, then you can read more about it on our website
Summary of Contents for EN13240
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