1.2.6 Chimney connection / chimney system
The chimney is one of the most critical factors in the successful
operation of any solid fuel heater, including the Fröling P4 boiler. A good
chimney will provide a continuous and dependable draft to pull the
exhaust gasses out of the building. The entire flue gas system must be
designed to prevent, wherever possible, damage caused by seepage,
insufficient feed pressure and condensation. Follow manufacturer’s
installation instructions for installing and supporting any specific
chimney product.
The boiler must be connected to a stainless-lined chimney or to a factory-built
Type UL 103 HT (ULC S629 in Canada) approved chimney. The chimney must
be in good condition. If the boiler is connected to a dirty or inadequate
chimney, it can present a serious fire hazard. All chimneys and connections
must conform to NFPA standard #211. Install vent at clearances specified by
the vent manufacturer. No other appliance should be connected to this flue
unless allowed by the local code authority. Consult your local inspector for
chimney requirements and install the boiler in accordance with all applicable
codes.
Flue gas exhaust temperatures can be low enough to cause
condensation in chimneys. Condensation will, over time, damage a
masonry chimney. Accordingly, installation of a stainless chimney liner
(made with 304, 316, or 321) inside the chimney flue is strongly
recommended.
The flue gas temperatures (when cleaned) and the additional flue gas
values can be found in the technical specification sheets (See chart
below “see chart below “Boiler data for constructing the flue gas
system”.
The smoke pipe connecting the boiler to the chimney flue must be black
or stainless (stainless recommended), have a minimum thickness of 24
gauge, and rise a minimum of ¼” per foot of run toward the chimney.
Smoke pipe sections must be attached to one another with a minimum
of three sheet metal screws and sealed with hi-temperature silicone. The
smoke pipe should not contain more than two 90° elbows (45° elbows
are preferred over 90° elbows).
The chimney draft must be stable (see chart below “Basic Boiler Data for
Layout of Chimney System”.
The top of the chimney must be 3 feet (0.9 m) above the roof and 2 feet
(0.6 m) above any structure within 10 feet (3.0 m) measured
horizontally.
Barometric Damper
We recommend that you install a barometric damper. 1
Install the barometric damper directly under the mouth of the flue
line, as there is always low pressure there. 1
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