John Wood Atmospheric Gas (Standard) - Manual (Page 13)

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location. A single wall metal vent connector cannot pass
through any interior wall.
When installing a vent connector, please note the following
(See Figures 16-18):
•
Install the vent connector avoiding unnecessary bends,
which create resistance to the flow of vent gases.
• Install without dips or sags with an upward slope of at
least 1/4-inch per foot (21 mm per metre).
• Joints must be fastened by sheet metal screws or other
approved means. It must be supported to maintain
clearances and prevent separation of joints and dam-
age.
• The length of the vent connector cannot exceed 75% of
the vertical vent height.
• The vent connector must be accessible for cleaning,
inspection, and replacement.
• Vent connectors cannot pass through any ceiling, floor,
firewall, or fire partition.
• It is recommended (but not mandatory) that a minimum
12 inches (30.5 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 8).
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
CHIMNEY TERMINATION VENT SYSTEM
SUPPORT
STRAP
1
1
MAINTAIN CLEARANCE
MAINTAIN
CLEARANCE
1
SEE END NOTES
ON NEXT PAGE
FIGURE 8.
CSA B149.1-current edition (Natural Gas and Propane
Installation Code) and all local/provincial codes.
The vent pipe installation must not be obstructed so as
to prevent the removal of exhaust gases to the outside
atmosphere.
IMPORTANT:
• The use of vent dampers is not recommended by the
manufacturer of this water heater. Although some
vent dampers are certified by CSA International, this
certification applies to the vent damper device only
and does not mean they are certified for use on this
water heater.
• Certified (listed) fuel gas and carbon monoxide (CO)
detectors are recommended in all applications and
should be installed using the manufacturer’s instructions
and local codes, rules, or regulations.
• The venting system must be installed by a qualified
technician.
Draft Hood Installation
Align the legs of the draft hood with the slots provided.
Insert the legs and secure the draft hood to the water
heater’s top with the four screws provided as shown in
Figure 7.
SHEET METAL SCREWS (FOUR PROVIDED)
DRAFT HOOD
LEGS
LEGS
SLOT SLOT
JACKET TOP
INSTALL THE DRAFT HOOD WITH
THE FOUR SCREWS PROVIDED.
FIGURE 7.
Do not alter the draft hood in any way. If you are replacing
an existing water heater, be sure to use the draft hood
supplied with this water heater.
Vent Pipe Size
It is important that you follow the guidelines in these
instructions for sizing a vent pipe system. If a transition to
a larger vent size is required, the vent transition connection
must be made at the draft hood outlet.
Vent Connectors
1. Type B, double wall, certified (listed) Vent Pipe.
2. Single wall Vent Pipe.
Maintain the manufacturer’s specified minimum clearance
from combustible surfaces when using type B double wall
vent pipe.
Vent connectors made of type B, double wall vent pipe
material may pass through walls or partitions constructed
of combustible material if the minimum listed clearance is
maintained.
Maintain a six inch (15.2 cm) minimum clearance from all
combustible surfaces when using single wall vent pipe.
IMPORTANT: Single wall vent pipe cannot be used for
water heaters located in attics and may not pass through
attic spaces, crawl spaces or any confined or inaccessible