PELLET BOILER UNO
ARITERM SWEDEN AB Installation Instructions - 2008.05.21 - 6/28
Boiler house and Chimney
There are national regulations, e.g. the Swedish Building Regulations, that give
detailed directives about the performance of the boiler house, installation of
boiler in a boiler house, flue channel design etc. The plumber and the chimney
sweep can give the required information. The boiler house must for instance be
well ventilated and provided with a direct air inlet.
The boiler shall be placed on an even and stable concrete base.
The boiler is connected to the chimney/flue gas channel by the supplied turnable
flue gas pipe, preferrably horizontal. The flue gas channel may never be directed
downwards. The chimney shall be inspected before the installation. If there is any
doubt about the chimney design or its condition, the local chimney sweep has to be
contacted.
There must be an inlet air valve with min. 2 dm² area in the boiler house.
An outlet air fan may not be installed in the boiler house.
The UNO boiler’s combustion chamber and flue gas channels are designed to allow
combustion with a very high efficiency.
Note that the flue gases can condense with too low flue gas temperature, which
can cause freezing damage to the chimney. Rule of thumb: 1 m down in the
chimney the flue gas temperature should be at least 80°C when the burner is in
opertion. The chimney design and insulation determine the flue gas temperature;
a chimney of steel or of brick stone with insert pipe will not be damaged by low flue
gas temperatures provided that condensation, if any, is continously drained from the
lowest level of the chimney.
Install a draught regulator, if not already mounted.
The draught regulator shall be set at 15 Pa under-pressure. Too low under-
pressure can create the problem of overheating of the burner and too high under-
pressure can cause ignition problems and gas flashes.
Install the boiler min. 100 mm from the wall/chimney for easy service.
Also leave room for eventual cleaning access in the chimney.
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