High-altitude installations, Venting instructions – John Wood Takagi - 110-310-510 User Manual
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High-altitude Installations
Check the elevation where your water heater is installed.
Set DIPswitches shown in the table below depending on
the altitude.
110 & 310 Models
Altitude
0 to
2,000 ft
(DEFAULT)
2,000 to
4,000 ft
4,000 to
6,000 ft
Over
6,000 ft
Switch
No. 3
OFF
ON
OFF
Consult
our
Technical
Services
at 1-888-
479-8324
Switch
No. 4
OFF
OFF
ON
ON
8
7
6
5
4
3
2
1
ON
8
7
6
5
4
3
2
1
ON
8
7
6
5
4
3
2
1
510 Models (Left bank of DIPswitches)
Altitude
0 to
2,000 ft
(DEFAULT)
2,000 to
4,000 ft
4,000 to
6,000 ft
Over
6,000 ft
Switch
No. 4
OFF
ON
OFF
Consult
our
Technical
Services
at 1-888-
479-8324
Switch
No. 5
OFF
OFF
ON
ON
6
5
4
3
2
1
ON
6
5
4
3
2
1
ON
6
5
4
3
2
1
The dark squares indicate the direction the DIPswitches
should be set to.
110 & 310 Computer board
DIPswitches
510 Computer board
DIPswitches (Left bank)
WARNING
DO NOT adjust any DIPswitches on the
right bank for the 510 models.
Venting Instructions
General
DANGER
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.
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CAUTION
When installing the vent system, all appli-
cable national and local codes must be
followed. If you install thimbles, fire stops
or other protective devices and they pen-
etrate any combustible or noncombustible
construction, be sure to follow all applicable
national and local codes.
The water heater 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 manufacturer recommends the “T-Vent” line manufac-
tured by TAKAGI (Refer to “T-Vent” 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).
General rules for venting water heaters 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’s vent col-
lar.
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 termina-
tion 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 terminator 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 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.
A proper sidewall terminator is recommended when the
water heater is vented through a sidewall.
Regarding the clearances from the exhaust terminator to
the air inlet or opening, refer to the next few pages.
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