Legacy Stoves SF170, Installation And Operator'S Manual

Page: 8 / 51

Installation
To achieve safe and satisfactory results from
your Legacy Stoves hand-9red coal boiler, these
installation and operation guidelines must be strictly
adhered to. You must also check local building
codes in your area to ensure compliance.
GENERAL CHIMNEY INTRODUCTION
One of the most important considerations in
installing a boiler is the type of chimney that will be
used.
e condition and construction of the
chimney is important to providing su:cient dra;.
Having su:cient dra; is in turn important for safe,
e:cient operation.
e chimney produces the dra;,
not the appliance.
Draft
Dra; is created by a pressure di<erential between
the bo=om and the top of the chimney. Chimney
height, air moving across the top of the chimney,
and warmer air in the chimney than outside will all
result in greater pressure di<erences and stronger
dra;. A warm chimney dra;s be=er than a cold
one. For this reason a chimney dra;s best when kept
warm. It is more di:cult to maintain su:cient
temperature in an exposed chimney. A larger
chimney, or one with a lot of thermal mass will also
present more problems than a chimney that is
protected from outside temperature extremes. A
chimney must be kept warm (about 250º F) for
proper dra; to occur. A chimney's height, expressed
as the di<erence between the top opening and the
Eue pipe connection on the appliance, contributes to
dra; because atmospheric pressure is naturally
lower at the chimney top than bo=om. See Dra;
Control section in this manual for more information.
Poor chimneys with cold walls can
cause creosote buildup. Sharp
bends and horizontal flues should
also be avoided. The exhaust must
be kept moving through the
piping/flue to prevent creosote or fly
ash buildup. If a horizontal section
must be used, it must rise slightly to
prevent dead air space.
e chimney must be su:ciently tall (at least 20
feet for masonry chimneys) and should extend
several feet above the highest part of the roof to
prevent downdra;s. Follow code requirements for
your area and consult a chimney professional. Keep
in mind the 3-2-10 rule, as depicted below.
e
chimney must be leak-free from the standpoint of
air entering through cracks or other chimney defects
or through loose stovepipe 9=ings.
3-2-10 Rule for Chimneys
- 2 -