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Steel Body, Automatic Wood Pellet Feed Hot Water Boiler Operation and Maintenance
Manual
INFORMATION ON COMBUSTION
If the flue gas temperature is above the acceptable values, more energy will be exhausted from the
flue into the atmosphere. The material, construction and connection of the chimneys are important in
terms of high combustion efficiency, low heating costs and environmental protection.
The chimney must also be good for good combustion. High temperature resistant fire bricks and
stainless steel chimneys are recommended as materials. Horizontal
smoke ducts should be connected to the chimney with a slope of at
least 5% and the length should not exceed 1/4 of the chimney
height. The height of the chimney should be determined well and
the chimney rising from inside the building should rise up to 80 cm
from the ridge. Chimney sections should be circular unless required.
Never use perforated bricks in the chimney walls. Ideally, it is built
with fire bricks.
ÜNMAK Ecopel type boilers should be connected to an independent chimney which can provide
minimum desired minimum draft. It should be measured in 20 Pa with a manometer. The part of the
waste gas line between the boiler and the chimney should be insulated with glass wool. The flue gas
pipe and the flue must be made of sheet steel or of at least 300 °C resistant material. For better
combustion and efficiency, all connections on the flue gas pipe must be sealed. The flue gas pipe
must be connected to the flue as soon as possible within the dimensions given in the above diagram.
Horizontal connections and equipment such as the elbow that reduces traction should be avoided.
A vertical single steel pipe should not be used
as a chimney, the chimney must have an inner
and an outer surface. The outer surface may be
steel or brick braided. Corrosion resistant
stainless steel may be preferred for the inner
surface of the chimney. In order to prevent
condensation, thermal insulation should be
applied to the gap between the inner and outer
surface of the chimney.
At the lowest level of the chimney, there shall be a cleaning cap of any sealed steel.
The length of the flue gas pipe between the flue and the boiler must not exceed one quarter of the
flue height.
