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Adjusting the combustion air
All RAIS stoves are equipped with an easy-to-use handle for adjusting the air control.
For the various positions of the control please see the following illustrations. To en-
sure proper combustion process it is very important to supply the correct quantity of
air at the right time and place. The adjustment range made from factory may not be
altered for increasing firing for any reason.
Primary air is defined as combustion air for burning the mass of wood and stimulates
production of volatile gases.
Secondary air is used to burn off the gases at high temperatures (above
1,000°F/540°C) and to keep the glass free of soot. The secondary air is let through the
air control beneath the combustion chamber and is heated through the side chan-
nels, which is then directed to the glass. The warm air runs along the glass, keeping it
free of soot.
At the very back of the combustion chamber there is a tertiary channel at the top that
helps to combust the remaining gases.
When positioning the air control between Pos. 1 and 2 optimum utilization of the
energy contents of the wood is obtained, because of sufficient oxygen for combus-
tion. When the flames burn bright and yellow, the control has been adjusted correctly.
Finding the correct position takes some trial and error, but is easy to find.
Never close the air control completely when using the stove. A typical error is to close
the control too soon, because the heat gets too intense. This results in the appear-
ance of a dark cloud of smoke from the chimney and that means the energy value of
the wood is not being used properly.
It is important for proper control of the fire that the instructions in the manual are fol-
lowed and the stove door normally is kept closed. It is also necessary to keep the seals
in a good condition.