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Intake / Exhaust Guidelines
Refer to the specific instructions on your vent product
or additional installation requirements.
• This water heater is a direct vent water heater and
therefore is certified and listed with the vent system. You
must use vent components that are certified and listed
with the water heater model.
• Do not combine vent components from different
manufacturers.
• The vent system must vent directly to the outside of the
building and use outside air for combustion.
• Venting should be as direct as possible with a minimum
number of pipe fittings.
• Avoid dips or sags in horizontal vent runs by installing
supports per the vent manufacturer's instructions.
• Support horizontal vent runs every four feet and all
vertical vent runs every six feet or in accordance with
local codes.
• Vent diameter must not be reduced.
• Do not connect the venting system with an existing vent
or chimney.
• Do not common vent with the vent pipe of any other
water heater or appliance.
• Vent connections must be firmly pressed together so
that the gaskets form an air tight seal.
• On the 305 and 505 models, the vent piece connected to
the water heater must be secured with one self-tapping
screw.
• Refer to the instructions of the vent system manufacturer
for component assembly instructions.
• If the vent system is to be enclosed, it is suggested
that the design of the enclosure shall permit inspection
of the vent system. The design of such enclosure shall
be deemed acceptable by the installer or the local
inspector.
NOTICE: If it becomes necessary to access an enclosed
vent system for service or repairs, the manufacturer is
not responsible for any costs or difficulties in accessing
the vent system. Warranty does not cover obtaining
access to an enclosed vent system.
Condensate
If the condensate collector is not used, the drain pipe must
be capped to prevent exhaust gases and condensate from
entering the building. The cap is supplied on the appliance.
Condensate formation can occur in high efficiency direct
vent appliances. To prevent condensate damage follow
these instructions.
18
NOTICE: Provisions must be made to prevent the
condensate from entering the water heater. Without
proper drainage or disposal, condensate will damage
the heat exchanger.
• Vertical terminations must incorporate a condensate
drain and trap as close as possible to the appliance.
• Slope any horizontal venting 1/4 inch per foot (19 mm
/ m), towards the heater if the condensate collector is
used, or towards the exhaust terminal if the condensate
collector is not used.
• Dispose of condensate per local codes.
• The condensate trap must contain a minimum of 3 inches
(75 mm) of water.
• This water heater has an integrated condensate
collector.
• Regions of cold climate will create more condensate in
the vent system. The condensate collector should be
used in cold climates.
Maximum Vent Length
1. Determine the number of 90 degree elbows in the vent
system. (Two 45 degree elbows count as one 90 degree
elbow.)
2. Refer to the table to find the maximum vent length based
on the number of elbows.
3. Follow the applicable note.
Example: If you have one elbow then your maximum
vent length is 35 feet (10.7 m). If your actual length is
greater than 15 ft (4.6 m) then move dip switch no. 1
(SW1) to OFF.
Table 4: Number of 90° Elbows
0 1 2 3 4 5 6
41 ft@ 35ft® 29ft® 23ft® 17ft® 11 ft® 5ft®
(12.5 m) (10.7 m) (8.8 m) (7.0 m) (5.2 m) (3.4 m) (1.5 m)
(i) If the length is greater than
21 ft (6.4 m) then move dip
switch no. 1 (SW1) to OFF.
® If the length is greater than
15 ft (4.6 m) then move dip
switch no. 1 (SW1) to OFF.
® Ifthe length isgreater than 9 ft
(2.7 m) then move dip switch
no. 1 (SW1) to OFF.
® Move dip switch no. 1 (SW1)
to OFF.
Notes
d)®®@-*
Switch No.
ON
,Oi-- 1
F --
F 2
-- -- 3
-- -- 4
-- -- 5
-- -- 6
-- -- 7
-- -- 8
NOTICE: If you have a longer Fiaure 7
vent length, dip switch no. 1
is required to be in the OFF position. This ensures the
water heater will run properly. Blocked flue error codes
and shutdowns may result if dip switch no. 1 is not in
the correct position. On the 505 model, the maximum
water flow capacity will be reduced by about 10% when
dip switch no. 1 is OFF.
305 & 505 Indoor Manual