John Wood Takagi - 320H-520H - Manual (Page 9)

9
Diameter
Max. No. of
Elbow
Max. Vertical &
Horizontal (Total) Vent
Length
76mm
(3 in.)
2 7.6m (25 ft.)
102mm
(4 in.)
5 15.24m (50 ft.)
* For each elbow added, deduct 1.5m (5 ft.) from max.
vent length.
No. of
Elbows
Max. Vertical or Horizontal Length
76mm (3 in.)
venting
102mm (4 in.) venting
0 7.6m (25 ft.) 15.24m (50 ft.)
1 6m (20 ft.) 13.7m (45 ft.)
2 4.5m (15 ft.) 12.2m (40 ft.)
5 N/A 7.6m (25 ft.)
Excludes elbow termination, rain caps, or the 76mm
(3 in) PVC Concentric Termination
For details on the vent connection to the 520H, refer to pg.
10 & 11.
Exhaust vent (Stainless steel vent)
This is a Category IV 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 adhesive
tape having a minimum temperature rating of 72°C (160°F).
For best results, a vent system should be as short and
straight as possible.
The 520H is a Category IV appliance and must be vented
accordingly with any 102mm (4 in.) vent approved for use
with Category III/IV or Special BH type gas vent.
The manufacturer recommends the “T-Vent" line manu-
factured by TAKAGI (Refer to Takagi’s “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).
Follow the vent pipe manufacturer’s instructions when
installing the vent pipe.
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 / IV
approved or Special BH vent pipe).
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.
When the horizontal vent run exceeds 1.5m (5 ft.), sup-
port the vent run at 915mm (3 ft.) intervals with overhead
hangars. •
•
•
•
•
•
Diameter
Max. No. of
Elbow
Max. Vertical &
Horizontal (Total) Vent
Length
102mm
(4 in.)
5 15.24m (50 ft.)
* For each elbow added, deduct 1.5m (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 (5 ft.)
Vent termination
WARNING
Improper installation can cause nausea or
asphyxiation, severe injury or death from
carbon monoxide and flue gases poison-
ing. Improper installation will void product
warranty.
The vent terminator provides a means of installing vent
pipe through the building wall and must be located
in accordance with CSA-B149.1 and local applicable
codes.
A proper sidewall direct-vent terminator is recommended
when the water heater is vented through a sidewall.
General rules for venting the 520H water heater are:
1. Place the water heater as close as possible to the vent
terminator.
2. The vent collar of the water heater must be fastened
directly to an unobstructed vent pipe or TH-PA01 adap-
tor.
3. Do not weld the vent pipe to the water heater collar.
4. Do not cut the vent collar of the unit.
5. The weight of the vent stack must not rest on the water
heater.
6. The vent must be easily removable from the top of the
water heater for normal service and inspection of the
unit.
7. The water heater vent must not be connected to any
other gas appliance or vent stack.
8. 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.
9. Avoid using an oversized vent pipe or using extremely
long runs of the pipe.
10. Locate the vent terminator so that it cannot be blocked
by any debris, at any time. Most codes require that the
terminator be at least 305mm (12 in.) above grade, but
the installer may determine if it should be higher depend-
ing on the job site condition and applicable codes.
11. 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.
•
•