American Water Heater Power Flex 40-42K BTU - Manual (Page 7)

7
Venting
This water heater has a direct vent system in which all air
for combustion is taken from the outside atmosphere and
all combustion products are discharged to the outdoors.
This water heater must be properly vented for removal
of exhaust gases to the outside atmosphere. Correct
installation of the vent pipe system is mandatory for the
safe and efficient operation of this water heater and is an
important factor in the life of the unit.
Vent pipe installation must be performed in accordance
with state and local codes, or in the absence of such, the
National Fuel Gas Code, NFPA 54, ANSI Z223.1-current
edition. IMPORTANT: Check to make sure the vent pipe is
not blocked in any way.
NOTE: Do not common vent this water heater with any
other appliance. Do not install in the same chase or
VENT PIPE SYSTEM
chimney with a metal or high-temperature plastic from
another gas or fuel burning appliance.
When assembling the air inlet and vent outlet pipe system,
BOTH pipe diameters MUST be the same size. For
example, if a 2 inch diameter pipe is used on the air inlet
pipe then a 2 inch diameter pipe MUST be used on the vent
outlet. This requirement also applies to 3 inch diameter
piping configurations.
Vent Pipe Material
The following plastic materials may be used for both the
combustion air inlet and exhaust outlet piping subject to
state and local codes:
• 2 or 3 inch Schedule 40 PVC or ABS
• 2 or 3 inch Schedule 40 or 80 CPVC
• DWV Pipe is acceptable
NOTE: Use only solid (not foam core) piping. Plastic pipe
and fittings are available through most plumbing suppliers.
Always check the marking on the pipe to make sure you
are using the correct material.
Vent Pipe Connection to Blower
A 3”x2” condensate drain coupler is supplied with every
40-42K BTU model to connect either 2” or 3” venting to the
blower. A 3” condensate drain coupler is supplied with every
50-60K BTU model to connect 3” venting to the blower.
IMPORTANT: These connections must be properly sealed
to prevent the leakage of the products of combustion into
the living area. If needed 3”x2” & 3” condensate drain
couplers are available through the Parts Department for new
installations or retrofits where condensate may run back to
the blower.
Carbon Monoxide Warning
Follow all the local and state codes or, in
the absence of local and state codes, the
“National Fuel Gas Code”, ANSI Z223.1
(NFPA 54)- latest edition to properly install
vent system.
Failure to do so can result in death,
explosion, or carbon monoxide poisoning.
WARNING