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C. CHIMNEY / VENT & DRAFT CONTROL
WARNING
This boiler shall be connected to a venting system
having sufficient draft. Follow draft requirements
listed in Section C below.
Improper venting may result in property damage
and the release of flue gases which contain deadly
carbon monoxide into the home, which can cause
severe personal injury, death, or substantial property
damage.
1. Draft Requirement - Minimum draft required in the
vent system is -.03" W.C. to -.06" W.C. depending
on boiler model, see Table 7.1 (Section 7). This draft
is necessary to provide the required draft over fire of
-.01" W.C. to -.02" W.C..
2. A barometric draft control is required for regulation
of over fire draft. Follow manufacturer's instructions
to locate and adjust the control.
3. The vent system and installation must be in
accordance with the current edition of ANSI/
NFPA 211, "Standard for Chimneys, Fireplaces,
Vents, and Solid Fuel Burning Appliances";
NFPA-31, "Standard for the Installation of Oil-
Burning Equipment" and in Canada, CSA B 139,
"Installation Code for Oil-Burning Equipment" or
applicable provisions of local building codes. Typical
minimum chimney size is 8" x 8" x 15 feet high,
unless otherwise allowed by code. If the vent system
is not sized correctly, the burner may not operate
properly. This can cause poor combustion, sooting,
and odors to occur.
4. NFPA 31 recommends using a listed metal chimney
liner to reduce transient low draft during startup and
flue gas condensation during cyclic operation. Any
doubt on the condition of a chimney or its ability to
prevent the generation and accumulation of flue gas
condensate, must be lined according to NFPA 31.
5. Inspect the existing chimney, chimney liner, and vent
connector. Make sure each are in good condition
and repair or replace as required.
WARNING
A masonry chimney must have a clay flue liner.
If flue gas condensation is occurring, install a listed
corrosion resistant metal liner.
Failure to install a clay flue liner may cause severe
injury or death.
6. Chimney flue gas condensation is affected by a
number of factors such as chimney design, flue
connector length, sulfur content in fuel oil, and flue
gas temperature. If your application experiences flue
gas condensation, installation of a listed corrosion
resistant metal liner is required.
• External chimneys are more susceptible to flue
gas condensation due to exposure to outside air
temperatures. To prevent corrosion due to flue
gas condensation, use a listed corrosion resistant
metal liner.
• When firing the appliance where fuel oil sulfur
content exceeds 300ppm, a listed corrosion
resistant chimney liner is recommended.
WARNING
Series SBO is approved at the listed firing rates
only. Failure to fire the boiler at its designed input
may cause excessive flue gas condensation. In
addition, lower input may not create enough draft to
adequately evacuate the products of combustion.
D. PLANNING THE LAYOUT
Prepare sketches and notes of the layout of the
installation. Include boiler location, venting system,
existing piping and wiring. Show existing equipment that
may interfere with installation of new equipment.
E. BOILER WATER TREATMENT
Consult a local qualified water treatment specialist for
recommendations regarding the appropriate chemical
compounds and concentrations which are compatible
with local environmental regulations.
1. Boiler water pH should be in the 7.5 to 11 range.
2. Boiler water chloride concentration should
be less than 30 ppm.
3. The water hardness should be less than 7 grains per
gallon to prevent scale build-up and foaming.
PREINSTALLATION
3
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