John Wood Takagi - 910 - Manual (Page 8)

8
Direct-Vent Conversion Kit
Intake
Louver cover
plates
Direct-vent
conversion kit
Exhaust
Venting Instructions
WARNING
Improper venting of this appliance can
result in excessive levels of carbon mon-
oxide which can result in severe personal
injury or death.
This water heater must be vented in accordance with
the section “Venting of Equipment" of the latest edition
of Section 7 of CSA B149.1 Natural Gas and Propane
Installation Code and all applicable local building codes
.
Exhaust Vent
This is a Category III appliance and must be vented accord-
ingly. The vent system must be sealed air tight. All seams
and joints without gaskets must be sealed with high heat
resistant silicone sealant or UL listed aluminum adhe-
sive tape having a minimum temperature rating of 177°C
(350°F). For best results, a vent system should be as short
and straight as possible.
1. This water heater is a Category III appliance and must be
vented accordingly with any 127mm (5 in.) vent approved
for use with Category III or Special BH type gas vent.
2. The following are 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).
3. Follow the vent pipe manufacturer’s instructions when
installing the vent pipe.
4. Do not common vent this appliance with any other vented
appliance (Do not terminate vent into a chimney. If the
vent must go through the chimney, the vent must run all
the way through the chimney with Category III approved
or Special BH vent pipe).
5. The maximum length of exhaust vent piping must not
exceed 15.24m (50 ft.) deducting 1.5m (5 ft.) for each
elbow used in the venting system. Do not use more than
5 elbows.
Diameter
Max. No. of
Elbow
Max. Vertical or
Horizontal run in Length
127mm (5 in.) 5 15.24m (50 ft.)
*For each elbow added, deduct 5 ft. from max. Vent length.
No. of
Elbows
Max. Vertical or Horizontal Length
0 15.24m (50 ft.)
1 13.7m (45 ft.)
2 12.2m (40 ft.)
5 7.6m (25 ft.)
6. When the horizontal vent run exceeds 1.5m (5 ft.), sup-
port the vent run at 915mm (3 ft.) intervals with overhead
hangars.
7. The manufacturer will not be responsible for any damage
to the water heater caused by condensation from the
vent. For vent runs longer than 1.5m (5 ft.), installation of
a condensate drain is recommended. Install the conden-
sate drain as close to the water heater as possible. For
horizontal runs, slope the vent run back toward the water
heater where the condensate drain is installed at a rate
of 6.4mm (1/4 in.) per 305mm (1 ft.). Refer to pg. 9 for
the diagrams.
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 fol-
low all applicable national and local codes.