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Boiler is to be vented by natural draft
!
and shall not be connected into any
portion of a mechanical draft operating
system under a positive pressure.
Inspect chimney to make certain it is constructed according
to the latest revision of the NFPA 211. Local regulations
may differ from this code and should be checked. Where
there is a conflict, the local code will prevail.
The boiler must be installed into a chimney which has a
masonry or metallic chimney liner.
An unlined chimney will have leaks that will cause poor
chimney performance (no draft), and could result in a
positive pressure in the combustion chamber.
horizontal portions of the venting system should not
exceed 10 feet in length. Horizontal lengths over 10 ft. will
have a negative effect on the chimney performance.
The chimney should extend at least 2 ft. above any portion
of the building within 10 ft. (Figure #12) It should
produce a -.06 to -.08 inch W.C. draft, as measured with a
draft gauge between the boiler and barometric draft control
while maintaining an .02 inch W.C. negative draft in the
combustion chamber. in the combustion chamber. See
"Chimney or Vent Sizes" chart for recommended minimum
and maximum chimney or vent sizes.
Inadequate draft will cause improper combustion, resulting
in dirty flue ways and high fuel bills.
Connect flue pipe same size as boiler outlet to chimney,
sloping upward continuously toward the chimney
approximately ¼" per foot. Bolt or screw joints together to
avoid sag.
Oil tank and piping should be installed in accordance
with the National Board of Fire Underwriters and local
regulations. Oil storage tank, vent, fill pipe and caps should
be as prescribed by local codes. In no case should the vent
pipe be smaller than 1¼" I.P.S. The fill pipe should not be
less than 2" I.P.S.
VENTING SySTEM INSPECTION & INSTALLATION
WARNING
OIL TANk AND PIPING
If an oil fired water heater is vented into the same flue
as the boiler, provide a separate hole into the chimney
whenever possible. When this isn't possible, use a "Y"
connection in the flue pipe, using a separate draft regulator
for each unit. When a chimney will not provide adequate
draft to handle the input from the water heater and boiler
simultaneously, wire the units so that only one will operate
at a time, favoring the water heater.
Figure #12
CHIMNEY OR VENT SIZES
ROUND
INCHES
MODEL NUMBER
MIN
BC3
6
BC4
6
The suction line from the tank to the burner should be one
continuous piece of tubing to prevent air entering the line.
The suction line, must be ⅜" O.D. copper tubing for runs of
50 feet or less, and ½" O.D. for longer runs. An oil return
line, same size as the suction line, must be used on any
installation where the bottom of the tank is below the fuel
unit of the burner. Oil lines should be buried or otherwise
protected from mechanical injury. Flare fittings on all
oil lines are recommended. Compression fittings on the
suction line often allow air to be drawn into the fuel pump,
making it difficult to maintain oil pressure at the nozzle. Do
not run overhead fuel lines from tank to oil burner.
11
SQUARE
HEIGHT (FT)
INCHES
MAX
MIN
MAX
MIN
8
8x8
8x10
15
8
8x8
8x10
15
MAX
40
40
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