hergom CRAFTSBURY Installer Manual page 6

BRICKWORK CHIMNEYS
The advantages of these chimneys are:
The mass of bricks and/or tiles reduces the cooling of smoke in the chimney.
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The characteristic of the bricks in accumulating heat allows the house to remain warm for
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longer after the fire has been put out.
It may be built to one owns taste.
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If it is well built, it may be more fire-resistant than metal chimneys.
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Brickwork chimneys must be well lined to avoid smoke cooling. They must be built using
materials that withstand high temperatures and corrosion.
Make sure the chimney is really clean and that it operates correctly, this will avoid draught
losses, and the creosote formation.
Make sure the size of your chimney is appropriate and
not too high.
Should it be excessively high, a draught cutting valve
must be fitted.
If the brickwork chimney is of a larger section than the
one recommended by the appliance manufacturer,
another metal chimney with appropriate size should be
installed inside it, so as to avoid operating problems and
the creosote accumulations.
In this case it will be convenient to seal one of the
brickwork chimney ends against the tube to avoid the
formation of draughts that may cool the chimney. (See
Fig.-3)
It is recommendable that this sealing be carried out on
the upper part, to take advantage of the heat that is
produced in the whole chimney sector. In the same way,
it is recommended to form circulation in the inside of this
chamber between the tubes and the brickwork chimney
to allow a certain relief and to avoid extreme heat that
would damage the walls (cracks, etc...) For this all
needed is to fit this chamber with a lower grille and an
upper one (15X10 cm.) The air will circulate by natural
convection, carrying the hot air from the lower area to the
higher one, of the house.
METAL CHIMNEYS
The advantages of these chimneys are:
Easy to install.
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Slight changes in chimney direction may be made,
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leading to greater flexibility in the choice of location for the heater.
As there are curved elbow joints, the sharp edges that make the draught difficult are
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removed.
Ensure all the chimney tubes are well fitted in and their joints are completely air tight.
S S E E A A L L O O N N E E
6 (/ /$5
8 1 2 ' ( /2 6 O F T H E
O F T H E
(; 75 (0 2 6
E N D S
E N D S
Fig.- 3