A.O. Smith 910 Installation Manual And Owner's Manual page 8

The 910 model weighs 102 lbs. (46.3 kg). Ensure that any and all support structures
(whether it is installed on a wall, on a support stand, etc.) have enough strength to
support and hold the water heater.
When handling the 910, do not place your hands inside the flue collar. Injury may
result.
WARNING
Installation and service must be performed by a qualified installer (for example, a
licensed plumber or gas fitter). Otherwise, the warranty will be void.
The installer (licensed professional) is responsible for the correct installation of the
water heater and for compliance with all national, state / provincial, and local codes.
The manufacturer does not recommend installing the water heater in a pit or location
where gas and water can accumulate.
Do not have the vent terminal pointing toward any operating window, door, or opening
into a building.
Do not install the unit where water, debris, or flammable vapors may get into the flue
terminal.
Do not install next to any source of airborne debris, such as a clothes dryer, that can
cause debris to be trapped inside the combustion chamber, unless the system is direct-
vented.
The manufacturer does not suggest installing the water heater in an attic due to
safety issues. If you install the water heater in an attic:
Make sure the unit will have enough combustion air and proper ventilation.
collects on the flame sensor, the water heater will shut down and produce an
error code.
If the above conditions cannot be met, use the direct-vent conversion kit
100112186 (TM-DV50).
Place the unit for easy access for service and maintenance.
A drain pan, or other means of protection against water damage, is recommended
to be installed under the water heater in case of leaks. The manufacturer is not
responsible for damage due to water leaks.
Failure to observe these warnings could result in severe personal injury, death, and/or
property damage.
The warranty will not cover damage caused by water quality.
Only potable water can be used with this water heater. Do not introduce pool or
NOTICE
spa water, or any chemically treated water into the water heater.
Water hardness levels must not exceed 7 grains per gallon (120 ppm) for single
family domestic applications or more than 4 grains per gallon (70 ppm) for
all other types of applications. Water hardness leads to scale formation and
may affect / damage the water heater. Hard water scaling must be avoided or
controlled by proper water treatment.
Water pH levels must be between 6.5 and 8.5.
Well water must be treated.
The manufacturer recommends direct venting when the water heater is installed
in beauty salons, dry cleaners or any other locations in which such chemicals are
present in the air. Some chemicals used in beauty salons or dry cleaners may affect
the flame sensor. In such cases, the water heater may not work properly.
Although the water heater is designed to operate with minimal sound, the manufacturer
does not recommend installing the unit on a wall adjacent to a bedroom, or a room
that is intended for quiet study or meditation, etc.
Locate your heater close to a drain where water leakage will not do damage to
surrounding areas. As with any water heating appliance, the potential for leakage
at some time in the life of the product does exist. The manufacturer will not be
responsible for any water damage that may occur. If you install a drain pan under the
unit, ensure that it will not restrict the combustion air flow.
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