Connections
18
Venting Connection
(Gas Installations)
Gas installations
Venting codes
For gas-fired boilers install venting
system in accordance with all applicable
local codes:. In the absence of local
codes, follow national codes
H
Local codes or CSA B149.1 or .2 in
Canada, or
H
ANSI Z223.1 in the U.S.
Always use latest edition.
Safety inspection of existing venting
system
(applies to gas-fired boilers)
When existing boiler is removed from a
common venting system, the common
venting is likely to be too large for
proper venting of the appliances
remaining connected to it.
At the time of removal of an existing
boiler, the following steps shall be
followed with each appliance remaining
connected to the common venting
system placed in operation, while the
other appliances remaining connected
to the common venting system are not
in operation:
H
Seal any unused openings in the
common venting system.
H
Visually inspect the venting system
for proper size and horizontal pitch
and determine there is no blockage or
restriction, leakage, corrosion, or any
other deficiency which could cause an
unsafe condition.
H
Insofar as is practical, close all
building doors and windows, and all
doors between the space in which the
appliances remain connected to the
common venting system, and other
spaces of the building. Turn on any
exhaust fans, such as range hoods
and bathroom exhausts, so they will
operate at maximum speed. Do not
operate a summer exhaust fan. Close
fireplace dampers.
H
Place in operation the appliance being
inspected. Follow the Lighting and
Operating Instructions. Adjust
thermostat so appliance will operate
continuously.
H
Test for spillage at the draft hood
relief opening after 5 minutes of main
burner operation. Use the flame of a
match or a candle, or from a smoke
test kit.
H
After it has been determined that
each appliance remaining connected
to the common venting system
properly vents when tested as
outlined above, return doors,
windows, exhaust fans, fireplace
dampers and any other gas burning
appliance to their previous condition
of use.
H
Any improper operation of the
common venting system should be
corrected so the installation conforms
with the National Fuel Gas Code,
ANSI Z223.1 latest edition. When
resizing, any portion of the common
venting system should be resized to
approach the minimum size as
determined using the appropriate
tables in the CSA B149.1 or .2
National Fuel Gas Code (Canada), or
ANSI Z223.1 latest edition (USA).
Installation of boiler venting
Use approved vent material only. For
gas or propane, use B-vent (C-vent
recommended).
The vent connector of this boiler must
not be connected into any portion of
mechanical draft systems operating
under positive pressure.
The boiler should be located as close to
the chimney as possible. The vent
connection must be made in the
shortest possible way with minimum
elbows. If necessary, rearrange existing
water piping to achieve closest chimney
connection. Avoid long horizontal runs
of vent pipe.
Horizontal runs must be supported by
appropriate means to prevent sagging.
Horizontal runs must have not less than
¼” rise per ft. from the boiler to the
vent terminal. Metal strapping must be
used to support horizontal runs every
4 ft. Ensure the weight of the vent pipe
is not supported by the boiler.
Insulate vent pipe to reduce cooling of
flue gas.
Terminate venting system outside with
approved termination at least six feet
above boiler. Vent pipe must extend at
least three feet above the point where it
passes through the roof. Vent
termination must be at least two feet
higher than any portion of the building
within ten feet horizontal, and vent
termination must be at least two feet
higher than roof peaks within ten feet
horizontal.
Down draft and condensation problems
must be corrected (see page 31).
Chimney liner
A corrosion-resistant approved liner
must be installed in masonry or unlined
chimneys. The liner should be insulated
to prevent condensation of flue gas in
cold weather.
5167
404
v1
.9
Improper sizing, maintenance,
termination of vent or chimney can
cause flue gases to enter living
space. Any blockage of vent or
chimney by birds’ nests, ice, snow,
debris, or other materials can cause
flue gases to enter living space. Flue
gases entering living space can cause
carbon monoxide poisoning which can
result in severe personal injury or loss
of life.
WARNING
Installers must follow local
regulations with respect to
installation of carbon monoxide
detectors. Follow manufacturer’s
maintenance schedule of boiler.
WARNING
