John Wood Takagi - 240H-340H-540H - Manual (Page 13)

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VENTING INSTRUCTIONS
-General-
T-H3J-DV / 240H, T-H3S-DV / 340H, and T-H3-DV / 540H models must be vented in accordance with the
section “Venting of Equipment" of the latest edition of CSA B149.1 Natural Gas and Propane Installation
Code, as well as applicable local building codes.
The use of venting materials approved for Category III/IV appliances is recommended whenever
possible. However, these models may also be vented with plastic pipe materials such as PVC, CPVC,
and Polypropylene. For details, please refer to the Exhaust Vent (Plastic vent) section from p. 14. Vent
installations in Canada which utilize plastic vent systems must use venting that is ULC S636 certified.
General rules for venting water heaters are:
• Place the water heater as close as possible to the vent termination.
• The vent collar of the water heater must be fastened directly to an unobstructed vent pipe.
• Do not weld the vent pipe to the water heater’s vent collar.
• Do not cut the vent collar of the unit.
• The vent must be easily removable from the top of the water heater for normal service and
inspection of the unit.
• The water heater vent must not be connected to any other gas appliance or vent stack.
• Avoid using an oversized vent pipe or using extremely long runs of the pipe.
• For rooftop venting, a rain cap or other form of termination that prevents rain water from
entering into the water heater must be installed.
• Do not common vent or connect any vent from other appliances to the water heater vent.
General rules for vent terminations:
• Avoid locating the water heater vent termination near any air intake devices. These fans can
pick up the exhaust flue products from the water heater and return them to the building. This
can create a health hazard.
• Locate the vent termination so that it cannot be blocked by any debris, at any time. Most codes
require that the termination be at least 305 mm (12 in.) above grade, but the installer may
determine that it should be higher, depending on the job site condition and applicable local
codes.
• A proper sidewall termination is recommended when the water heater is vented through a
sidewall.
• Regarding the clearances from the exhaust termination to the air inlet or opening, refer to p. 18
and p. 19.
• Improper venting of this appliance can result in excessive levels of carbon
monoxide which can result in severe personal injury or death.
• Improper installation can cause nausea or asphyxiation, severe injury or death
from carbon monoxide and flue gases poisoning. Improper installation will void
product warranty.
DANGER
When installing the vent system, all applicable national and local codes must be
followed. If you install thimbles, fire stops or other protective devices and they
penetrate any combustible or noncombustible construction, be sure to follow all
applicable national and local codes.
CAUTION
Installation
Installation Manual