4.1. Air circulation
Inadequate circulation of air is the only reason for most complaints to the poor furnace performance!
Draught needed for this type of furnace is 12 Pa.
Lower value does not provide proper combustion which results in the buildup of carbon and an
excessive amount of smoke.
In case of too high air flow, the combustion will be done too fast and the heat will be lost through
chimney. For draught rates exceeding 15 Pa air flow has to be reduced by installation of mufflers.
Improper air flow indicators are:
dirty glass,
smoke leaking into the room,
furnace overheat,
improper burning.
4.2. General features
For better air streaming through the chimney the latter must exceed the roof edge for at least one
meter. Chimney must not be sheltered by surrounding objects.
The chimney ensures extraction of smoke even when there are strong horizontal winds and
unfavorable weather conditions, and prevents smoke's reversal. Because of that chimney is the most
common cause of dissatisfaction and complaints.
Deficient maintenance of the chimney can hinder the smoke flow as material from which the chimney
is made, such as mortar, bricks and other, may fall in or there may be a combustion product deposits and
intrusion of foreign objects.
The chimney must be thermally insulated as otherwise condensation occurs.
Surface of the
chimney inside components should be smooth and made of heat- and chemicals-resistant materials.
Summary of Contents for ELIPTIKO
Page 17: ...18 FURNACE COMPONENTS...
