15
INSPECT CHIMNEY
to make certain it is constructed
according to the latest revision of the NFPA211. Local
codes may differ from this code and should be checked.
Where there is a conflict, the local code will prevail. In
Canada refer to the National Building Code or CSA-A405
as applicable.
This 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
poor positive pressure in the combustion chamber.
Horizontal portions of the venting system should not exceed
10 feet in length. Horizontal lengths over 10 feet will have
a negative effect on the chimney performance.
The chimney should extend at least 2 feet above any por-
tion of the building within 10 feet. See figure 14 below. It
should produce a negative draft of .06 to .08 inches of water
column, (W.C.), 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.
See chart below for recommended 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 chim-
ney, sloping upward continuously toward the chimney
approximately ¼” per foot. Bolt or screw joints together
to avoid sag.
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, favor-
ing the water heater.
MORE THAN 10'(3.1 M)
10' (3.1 M)
2' (.61 M)
HEIGHT ABOVE ANY
ROOF SURFACE WITHIN
10' (3.1 M)
HORIZONTALLY
CHIMNEY 3'
RIDGE
MIN.
(.92 M) MIN.
GAS VENT OR
TYPE L VENT 2'
(.61 M) MIN.
CHIMNEY OR VENT SIZES
MODEL NO.
ROUND
INCHES
SQUARE
INCHES
HEIGHT
FEET
MIN MAX MIN MAX MIN MAX
365,3100
4100
6
8
8X8 8X8
15
40
4125,3125
4150, 5125
7
8
8X8 8X10 15
40
5175,5200
8
10
8X8 8X12 15
50
6150,6225
8
10
8x8 8x12 15
50
7275
8
10
8x8 8x12 15
50
VENTiNG SySTEm iNSPECTiON & iNSTALLATiON
Figure #14