VENTING INSTRUCTION
Exhaust Fans and Ventilation
The water heater is equipped with a combustible air
detector to measure whether there is enough air for
proper combustion. If there is not, the water heater
will not work until sufficent air is provided.
Any equipment, which uses air from an enclosed
space, can deplete the air from that area. This can
result in exhaust flowing from the flue to the enclosed
space, which could result in the accumulation of
dangerous exhaust fumes in the space where the
water heater is installed.
Additional air must be supplied to compensate for
any exhaust effect.
If a fan blower is used to supply air to the water heater
room, the installer should make sure it does not cre-
ate drafts, which could cause unwanted shutdowns.
If a blower is necessary to provide adequate com-
bustion air to the water heater, a switch or equiva-
lent device must be wired into the water heater con-
trol to prevent the water heater from firing unless the
blower is operating.
This water heater must be vented in accordance with
"Venting of Equipment" section of the latest edition
of the National Fuel Gas Code, ANSI Z223.1 and all
aapplicable local building codes.
Exhaust Venting Installation
EXHAUST VENTING INSTALLATION
VENTING CONNECTION
20
WARNING
!
!
Improper venting of this appliance can result in
excessive levels of Carbon Monoxide, which can
cause severe personal injury or death.
The vent system must be gas tight. All seams and
joints must be sealed with silicone sealant or adhe-
sive tape having a minimum temperature rating of
400 F.
When installing the vent system, all applicable na-
tional and local codes must be followed. If thimbles,
fire stops or other protective devices are going to be
installed which will penetrate any combustible or
noncombustible construction, be sure to follow all
applicable national and local codes.
Fan assisted appliances: Follow the requirement as
indicated in the latest edition of ANSI Z233.1/NFPA
54.
Horizontal exhaust vent connectors must pitched
downward to the terminal if condensate collector is
not used, at least 1/4" per foot of length. Single wall
vent connectors must be at least 6" from adjacent
unprotected combustible surfaces. Joint of vent con-
nectors should be securely fastened by sheet metal
screws or other approved method.
The entire vent system must not exceed the size
specified in table.
VENTING LENGTH
General rules for venting system
Place the water heater as close as possible to the
vent.
The vent collar on the water heater must be fastened
directly to an unobstructed vent pipe.
Do not weld the vent pipe to the water heater collar.
The weight of the stack must not rest on the water
heater. The flue must be easily removable for nor-
mal service and inspection of the unit.
The water heater must not share common vent with
a fireplace, wood stove or other appliances.
Avoid terminating the water heater vent near any air-
conditioning or air-supply fans.
Avoid using an oversized vent pipe or using extremely
long runs of the pipe. This may cause excessive
cooling and condensation of flue exhaust gases.
The venting system must be installed in a manner
which allows inspection during the installation of the
venting pipes and joints as well as periodic inspec-
tion after installation as required by ANSI standards.
1.
2.
3.
4.
5.
6.
7.
For each elbow added, deduct 5 feet from maxi-
mum vent length. For example, 30 ft. is the maxi-
mum total distance if two elbows are used.
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Diameter
4 inches
Max. No. of Elbow
3 ea
Max. Vertical or Horizontal run in Length 40 ft
When the horizontal vent run exceeds 5 feet the
following criteria must be observed:
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VENTING CLEARANCES
12" minimum from the ground, 9" from ceiling over-
hangs.
The power vent outlet terminal shall terminate at
least 36" above any forced air inlet located within
10 feet.
The power vent outlet terminal shall terminate at
least 4 feet below, 4 feet horizontally from or 1
foot above any door, window or gravity air inlet
into the building.
VENTING TROUGH ROOF-CLEARANCES
The power vent outlet terminal shall terminate at
least 12" above the roof surface.
The location selection must provide clearance
for servicing and proper operation of the water
heater.
Ÿ
Support the vent run at 3 feet intervals with over-
head hanger.
Pitch down the vent run toward the vent terminal
at a rate of 1/4 inch per every foot of horizontal
run if condensate collector isn't used.
