6
When ducts are used, they shall be of the same
cross-sectional area as the free area of the openings to
which they connect. The minimum short side dimension
of rectangular air ducts shall not be less than three (3)
inches (7.6 cm).
Louvers and Grilles
In calculating free area for ventilation and combustion
air supply openings, consideration must be given to the
blocking effect of louvers, grilles, or screens protecting
the openings. Screens must not be smaller than
1
/
4
inch
(6.4 mm) mesh. If the free area through a particular
design of louver or grille is known, it should be used in
calculating the size of opening required to provide the
free area specified. If the design and free area is not
known, it may be assumed that wood louvers and
grilles will allow 20-25% free area and metal louvers
and grilles will allow 60-75% free area. Louvers and
grilles must be installed in the open position or intercon-
nected with the water heater so that they are opened
automatically during water heater operation.
Corrosive Atmospheres
If this water heater is to be installed in a beauty shop,
barber shop, photo processing lab, dry cleaning
establishment, a building with an indoor pool, or near
a chemical storage area, it is imperative that the
combustion and ventilation air be drawn from outside
these areas. These particular environments contain
products such as aerosol sprays, detergents, bleach-
es, cleaning solvents, refrigerants, and other volatile
compounds that, in addition to being highly flamma-
ble, become highly corrosive acid compounds when
burned. Exposure to such compounds can be
hazardous and lead to premature product failure.
Should the water heater fail, due to exposure to
such a corrosive atmosphere, the warranty is void.
Venting
DANGER
WARNING
CAUTION
AVERTISSEMENT
ATTENTION
When installing the venting system, make sure to follow
all local codes or, in the absence of local codes, CAN/
CSA B149.1, Natural Gas and Propane Gas Installation
Code, in Canada, and/or the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, in the United States. Never oper-
ate the water heater unless it is properly ventilated to the
outdoors and has adequate air supply for proper opera-
tion. Failure to properly install the venting system could
result in property damage, personal injury, or death.
According to the CAN/CSA B149.1, Natural Gas and
Propane Gas Installation Code, plastic venting systems
installed in Canada must be certified to the ‘‘STANDARD
FOR TYPE BH GAS VENTING SYSTEMS ULC S636’’.
Components of the certified venting system must not be
interchanged with other venting systems or unlisted pipe/
fittings. Plastic components and specified primers and
glues of the certified venting system must be from a sin-
gle venting system manufacturer and not intermixed with
other venting system manufacturer’s venting system
parts unless those are certified to be used with this sys-
tem. Plastic venting systems shall also be installed such
that the first three (3) feet (91 cm) of pipe from the water
heater outlet are readily accessible for visual inspection.
IMPORTANT
The water might be vented using one of the following
options only:
• Three (3) inch (7.6 cm) or four (4) inch (10.2 cm)
schedule 40 PVC or CPVC, pipe and fittings.
PolyPro
®
InnoFlue
®
• Three (3) inch (7.6 cm) or four (4) inch (10.2 cm)
Centrotherm polypropylene rigid pipe and fittings.
(InnoFlue single-wall vent system).
PolyPro
®
InnoFlue
®
• Three (3) inch (7.6 cm) or four (4) inch (10.2 cm)
DuraVent polypropylene rigid pipe and fittings.
(Polypro single-wall gas vent system).
PolyPro
®
InnoFlue
®
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel
®
(polyphenylsulfone) in non-metallic
venting systems is prohibited.
Before installing the vent piping, make sure that the
venting system layout has been properly planned.
Verify that the location of the water heater respects all
clearances from combustible material, all venting
requirements (
see Table 1
), and that the vent terminal
will be installed as specified by all local codes or, in
the absence of local codes, CAN/CSA B149.1, Natural
Gas and Propane Installation Code, in Canada, and/
or the National Fuel Gas Code, ANSI Z223.1/NFPA
54, in the United States (
see Figure 8
).
This water heater is equipped with a power venter that
evacuates the products of combustion to the outdoors.
All models are shipped from the factory with the power
venter already installed. This water heater must be
vented directly to the outdoors, either horizontally
Table 1
MAXIMUM EQUIVALENT LENGTH OF PIPE —
DO NOT EXCEED MAXIMUM LENGTH OF PIPE
PIPE VENT DIAMETER
3 inches (7.6 cm)
4 inches (10.2 cm)
Maximum length of pipe plus one 45-degree termination elbow
50.0 feet (15.2 m)
180.0 feet (54.9 m)
Minimum length of pipe plus one 90-degree elbow and plus one 45-degree termination elbow
2.5 feet (0.8 m)
50.0 feet (15.2 m)
One 45-degree radius elbow is equivalent, in straight pipe, to
4.0 feet (1.2 m)
4.0 feet (1.2 m)
One 90-degree radius elbow is equivalent, in straight pipe, to
7.0 feet (2.1 m)
8.0 feet (2.4 m)
INSTALLATION INSTRUCTIONS
