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Connections
Venting Connections
IMPORTANT
The size of the flue gas outlet on the boiler does not
automatically determine the horizontal breeching, or the
actual chimney diameter.
The chimney size must be designed for the actual boiler
model and its respective input.
Barometric draft regulator
Barometric draft regulator type
For natural gas or propane applications, use a double-
acting type.
For #2 fuel oil applications, use a single-acting type.
Barometric draft regulator diameter
The barometric draft regulator must be the same diameter
opening as the chimney for which the vent is sized.
For example, a 14 in. chimney would require a 14 in.
barometric draft regulator. Do not size the barometric
draft regulator to the breeching outlet of the boiler, unless
the chimney is also intended to be of that diameter.
IMPORTANT
The size of the flue gas outlet on the boiler does not
automatically determine the horizontal breeching, or the
actual chimney diameter.
The chimney size must be designed for the actual boiler
model and its respective input.
30
(continued)
Vitorond 200, VD2A Series Installation
Venting requirements
Venting option #1 (Category I venting)
For natural gas or liquid propane use Type B vent or Type
L vent for the entire vent whenever possible.
H Use approved vent material only. Consult reputable
chimney manufacturer such as Security Chimney Ltd.,
Laval, PQ, Canada.
H The vent connector of this boiler must not be connected
to any portion of mechanical draft systems operating
under positive pressure.
H The boiler should be located as close to the chimney
as possible. The vent connection must be made
in the shortest possible way with a minimal number
of elbows. If necessary, rearrange existing water
piping to achieve closest possible chimney connection.
Avoid long horizontal runs of vent pipe.
H Horizontal runs must be supported by appropriate
means to prevent sagging. Horizontal runs should have
no less than ¼ in. (6 mm) rise per ft. (31 cm) from the
boiler to the vent terminal.
Metal strapping must be used to support horizontal runs
every 4 ft. (1.2 m).
H Insulate vent pipe to reduce cooling of flue gas.
H Terminate venting system outside with approved
termination at least 6 ft. (1.8 m) above boiler.
Vent pipe must extend at least 3 ft. (91 cm) above the
point where it passes through the roof. Vent termination
must be at least 2 ft. (61 cm) higher than any portion
of the building within 10 ft. (3 m) horizontal, and vent
termination must be at least 2 ft. (61 cm) higher than
roof peaks within 10 ft. (3 m) horizontal.
Down draft and condensation problems must be
corrected.
H Drill a ½ in. (13 mm) opening on the side of the
vent pipe approximately three times the vent pipe
diameter away from the flue gas collar of the boiler
for combustion analyzing equipment.
H Do not use B-vent for #2 oil installations. A vent
approved for use with oil-fired installations must
be used.
H For natural gas or LP, B-vent may be used. A field
measurement of the stack temperature before dilution
air is required to ensure that the flue gas temperature
does not exceed 480ºF (249ºC) while using the B-vent.
H With this boiler installation it is recommended to install
an approved stainless steel liner in a masonry chimney
or unlined chimney.
Observe and follow local codes and regulations.
H Based upon proper chimney and breeching size, the
boiler may be vented into a chimney / breeching with
a direct-fired (atmospheric) gas water heater. Observe
national codes and local rules and regulations.
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