User Guide
10 Page
Installaon
Installaon 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 Z223.1/NFPA 54 in the United States and/or Section 7 of the
CAN/CSA B149.1 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. Fordetails,pleaserefertotheExhaustVent(ABS,PVC,CPVC,orPolypropyleneVent)
sectiononp.11. Vent installations in Canada which utilize plastic vent systems must use venting that
complies with ULC S636.
Generalrulesforventingwaterheatersare:
• 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.
• 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 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.
Water heater vent terminator must be at least 2
ft. (610 mm) away from an inside corner for both
outdoor installation and direct-vent installation.
Inside
Corner
2 ft.
(610 mm)