Takagi T-H3M-IN/OS - Manual (Page 10)

10
Page
Installation
Installation Manual
VENTING INSTRUCTIONS
For the 140 Indoor (T-H3M-DV) model
-General-
• 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
The Indoor model must be vented in accordance with the section “Venting of Equipment" of the latest
edition of the National Fuel Gas Code: ANSI Z2231/NFPA 54 in the United States and/or Section 7 of the
CAN/CSA B1491 Natural Gas and Propane Installation Code in Canada, as well as applicable local building
codes
The use of venting materials approved for Category III/IV appliances is recommended whenever possible
However, the Indoor model may also be vented with plastic pipe materials such as ABS, PVC, CPVC, or
Polypropylene For details, please refer to the Exhaust Vent (ABS, PVC, CPVC, or Polypropylene Vent)
section on p. 11. Vent installations in Canada which utilize plastic vent systems must use venting that
complies with ULC S636
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 or alter the vent collar of the water heater
• The vent must be easily removable from the top of the water heater for normal service and
inspection of the unit
• 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 terminate the vent into a chimney If the vent must go through the chimney, the vent
must run all the way through the chimney with approved vent pipe
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 12 inches (305 mm) above grade, but the installer may
determine if it should be higher depending on the job site condition and applicable 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 17
to 19