John Wood Takagi - 710 - Manual (Page 8)

8
General rules for venting the 710 water heater are:
Place the water heater as close as possible to the vent
terminator.
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 collar.
Do not cut the vent collar of the unit.
The weight of the vent stack must not rest on 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 locating the water heater vent terminator near any
air intake devices. These fans can pick up the exhaust
flue products from the gas appliance and return them to
the building. This can create a health hazard.
Avoid using an oversized vent pipe or using extremely
long runs of the pipe.
Locate the vent terminator so that it cannot be blocked by
any debris, at any time. Most codes require that the ter-
minator be at least 305mm (12 in.) above grade, but the
installer may determine if it should be higher depending
on the job site condition and applicable codes.
For rooftop venting, a rain cap must be installed.
THE MANUFACTURER recommends the “T-Vent”
line manufactured by TAKAGI (Refer to the venting
brochure for details). However, the following are
also UL listed manufacturers: ProTech Systems Inc.
(FasNSeal), Flex-L Inc., Z-Flex Inc. (Z-Vent III), Metal-
Fab Inc., and Heat-Fab Inc. (Saf-T Vent).
Horizontal Installation Diagram
Vertical Condensation
Drain (Install accord-
ing to local codes)
Sidewall Vent
Terminator
Wall
Backflow
preventor
(Recommended
for freezing
weather condi-
tions: 2.2°C
(36°F) and below)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Vertical Installation Diagram
Vertical Condensation
Drain (Install accord-
ing to local codes)
Backflow
preventor
(Recommended
for freezing
weather condi-
tions: 2.2°C
(36°F) and below)
Roof
Rain Cap
Roof Flashing
• Regarding the clearance from the terminator to the air
inlet or opening, refer to the next page.
• Install a condensation drain in the venting.
• Follow the vent system to vent manufacturer’s instruction
and local code.
• Do not common vent or connect any vent from other
appliances to the 710 vent.
• Use 102mm (4 in.) category III approved or Special BH,
single or double wall stainless steel vent pipe.