„Installation and operation manual for fireplace insert”
KFDECOENG1.1562012
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Then, push the door ajar, leaving a small gap (of a few centimetres). This stage of lighting up
requires constant control of fire by the user, allowing determination of the right moment to
add thick chunks of wood and to close the door. From now on, the process of lighting up
proceeds with the air inlet (bottom lever) open to the maximum and with open chimney
damper (top lever). The fireplace may burn at these settings for a few up to over ten minutes,
until fire spreads over all fuel in the furnace. By then, the turbine pushing hot air into
particular rooms should be activated automatically, if the hot air distribution system is
equipped with a turbine. Now, add a full load of fuel (5 kg of wood
– several finer chunks with
the length of 33 cm) and close the chimney damper. From now on, control the combustion
rate exclusively by the supply of air (handle at the bottom of the furnace). The position of the
adjustment handle and, consequently, the combustion rate are to be set so as not to exceed
the combustion rate of 4 kg of wood per hour (in most cases, this corresponds to the central
position of the bottom handle). Greater combustion rate involves emission of power
exceeding rated power of the insert, and involves the risk of thermal overloading. From now
on, the fireplace does not require the user’s intervention except for adding wood. the
Chimney damper must be opened whenever the door of the furnace is to be opened,
otherwise, smoke from the furnace will come out to the room. The frequency of adding fuel
depends on several factors: position of adjustment elements, quality of used wood and
chimney draught which also depends on the weather.
An excessive quantity of wood and an excessive quantity of combustion air may cause
overheating and, consequently, damage to the fireplace insert.
When the door of the fireplace insert is being opened (for lighting up and adding of fuel), the
chimney damper of the fireplace insert must be opened. Otherwise, smoke will come out to
the room where the fireplace is installed. During normal operation of the fireplace, the
chimney damper ought to be closed. To avoid smoking of the room, fuel should only be
supplemented during the final stage of combustion, i.e. when only a layer of embers remains
in the furnace. The furnace door is to be opened slowly to equalise the pressures and avoid
smoking, and it is to be closed immediately after adding fuel.
If fuel is added at longer intervals, when there is only a layer of embers in the furnace, the
lighting up process ought to be divided into two stages. During the first stage, add only 1 or 2
small chunks of wood into the furnace when the chimney damper and air inlet are open.
Once fire spreads over the chunks, in stage two add the right quantity of fuel and set the
adjustment levers appropriately.
If a large quantity of wood is placed over a layer of embers (in particularly, fine pieces of
wood with thick bark), this may result in sudden production of considerable quantities of gas
in the furnace and its ignition. To eliminate that hazard, fuel ought to be added in a manner
preventing “stifling” of the flame and accumulation of gases. Combustion of gases ought to
take place on an ongoing basis, i.e. the user should aim at keeping at least a small flame
visible inside the furnace.
Apart from adjustment of combustion air inlet (bottom lever), intensity of the combustion
process and, as a consequence, thermal efficiency of the fireplace insert depend as well on
chimney parameters. In case of insufficient negative pressure (draught), the chimney damper
(top lever) may be opened when the fireplace is lit up; in that case, position of air supply
adjustment lever (bottom lever) is to be adjusted accordingly. However, this is not
recommended as it involves reduction of fireplace thermal efficiency.
In order to light up the fireplace insert properly for the first time (the product is processed
using lacquers resistant to high temperatures), please remember that:
•
construction materials used for building the fireplace are not homogeneous: steel and
chamotte elements are used,
