John Wood Atmospheric Gas (ENERGY STAR) - NEW - Manuel (Page 13)

13
Gas vents must be supported to prevent damage, joint
separation, and maintain clearances to combustible
materials (Figures 11 and 12).
VERTICAL GAS VENT SYSTEM WITH
TYPE B DOUBLE WALL VENT PIPE.
LISTED VENT CAP
TYPE B DOUBLE
WALL VENT PIPE
MAINTAIN
SPECIFIED
CLEARANCE
VENT
CONNECTOR
SLOPE UP
1/4 IN. PER FT.
(21 mm PER METRE)
MINIMUM
MAINTAIN
CLEARANCE
SUPPORT
STRAP
MAINTAIN SPECIFIED CLEARANCE MAINTAIN
SPECIFIED
CLEARANCE
1,2
1
1
1
FIGURE 11.
VENTING THROUGH A CHIMNEY WITH
TYPE B DOUBLE WALL VENT PIPE.
LISTED VENT CAP
VENT CONNECTOR
UNUSED CHIMNEY
FLUE OR MASONRY
ENCLOSURE
SEAL
MAINTAIN
CLEARANCE
VENT
CONNECTOR
SLOPE UP
1/4 IN. PER FT.
(21 mm
PER METRE)
MINIMUM
MAINTAIN
SPECIFIED
CLEARANCE
SUPPORT
STRAP
MAINTAIN SPECIFIED CLEARANCE
1,2
1
1
FIGURE 12.
1 Vent pipe must be installed according to CAN/CSA
B149.1-current edition (Natural Gas and Propane
Installation Code) and all local/provincial codes.
2 Refer to local building code and/or the National Building
Code of Canada.
IMPORTANT: This gas vent must be terminated in a
vertical position to facilitate the removal of the burnt gases.
An unused chimney flue or masonry enclosure may be used
as a passageway for the installation of a gas vent (Figure 12).
Common (combined) venting is allowable with vertical type
B vent systems and lined masonry chimneys as long as
proper draft for the water heater is established under all
conditions of operation. CAUTION: DO NOT common vent
this water heater with any power vented appliance.
• Vent connectors cannot pass through any ceiling, floor,
firewall, or fire partition.
• It is recommended (but not mandatory) that a minimum
12 inches (30.48 cm) of vertical vent pipe be installed on
the draft hood prior to any elbow in the vent system.
IMPORTANT: Existing vent systems must be inspected for
obstructions, corrosion, and proper installation.
Chimney Connection
IMPORTANT: Before connecting a vent to a chimney,
make sure the chimney passageway is clear and free of
obstructions. The chimney must be cleaned if previously
used for venting solid fuel appliances or fireplaces. Also
consult the “Natural Gas and Propane Installation Code,”
CAN/CSA B149.1-current edition as well as local and
provincial codes for proper chimney sizing and application.
• The connector must be installed above the extreme
bottom of the chimney to prevent potentially blocking
the flue gases.
• The connector must be firmly attached and sealed to
prevent it from falling out.
• To aid in removing the connector, a thimble or slip joint
may be used.
• The connector must not extend beyond the inner edge
of the chimney as it may restrict the space between it
and the opposite wall of the chimney (Figure 10).
LISTED LINED
CHIMNEY
DO NOT EXTEND
VENT BEYOND EDGE
OF CHIMNEY
VENT
CONNECTOR
MAINTAIN
CLEARANCE
SEAL
SLOPE
UP 1/4 IN.
PER FT.
(21 mm
PER
METRE)
MINIMUM
SUPPORT
STRAP
1
1
MAINTAIN CLEARANCE
MAINTAIN
CLEARANCE
1
SEE END NOTES
ON NEXT PAGE
FIGURE 10.
Do not terminate the vent connector in a chimney that has
not been certified for this purpose. Some local codes may
prohibit the termination of vent connectors in a masonry
chimney.
Vertical Exhaust Gas Vent
Vertical exhaust gas vents must be installed with U.L. listed
type B vent pipe according to the vent manufacturer’s
instructions and the terms of its listing.
It must be connected to the water heater’s draft hood by a
listed vent connector or by directly originating at the draft
hood opening.
Vertical gas vents must terminate with a listed cap or
other roof assembly and be installed according to their
manufacturer’s instructions.