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a sediment trap) must be incorporated in the piping. The
drip leg must be readily accessible. Install in accordance
with the “Gas Piping” section. Refer to the current edition
of the National Fuel Gas Code (ANSI Z223.1/NFPA 54).
GAS LINE PURGING
Air may be present in the gas lines and could prevent
the burner from lighting on initial start-up. The gas lines
should be purged of air by a qualifi ed service technician
after installation of the gas piping system.
HIGH ALTITUDE INSTALLATIONS
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
• Special consideration must be taken
with installations above 11,000' (3,352m).
• Please contact an AO Smith qualified
service agent to obtain proper setup and
instructions before lighting.
• Failure to implement the proper setup
will result in improper and inefficient
operation of the appliance resulting in
production of increased levels of carbon
monoxide gas in excess of the safe
limits which could result in serious
personal injury or death.
Breathing Hazard - Carbon Monoxide Gas
WARNING
The heater is set at the factory to operate at altitudes from
sea level to 3,500 ft. (1,067m). Accessory kits are available
to allow the heater to operate at altitudes higher than 3,500
ft. (1,067m). These accessory kits are listed in the table
below. Instructions for installing these accessories are
included in the kits.
Altitude ft (m) Kit #
3,501 - 6,500 (1,067 -1,981) 9007439005
6,501 - 8,500 (1,981 - 2,591) 9007440005
8,501 - 11,000 (2,591 - 3,352) 9007441005
Rated inputs are suitable up to 11,000 ft. (3,352m)
elevation. Consult the factory for installation at altitudes
over 11,000 ft. (3,352m).
WARNING: THIS HIGH EFFICIENCY WATER HEATER
IS CERTIFIED FOR USE AT AN ALTITUDE OF 11,000
Ft. (3,352 METERS). HOWEVER, FOR USE AT
ALTITUDES OVER 3,500 Ft. (1,067m) THE PCB MUST
BE CHANGED.
Some gas utility companies derate their gas for altitude,
making it unnecessary to modify the water heater for high
altitude installations. Call the local gas or utility company
to verify BTU content.
FLOODING/FREEZING
If this water heater has been exposed to flooding,
freezing, fi re or any unusual condition, do not put it into
operation until it has been inspected and approved by a
qualifi ed service technician. These conditions can result
in unseen internal damage and are not subject to warranty
coverage.
FILLING THE WATER HEATER
Never use this water heater unless it is completely full of
water. To prevent damage to the tank, the tank must be
fi lled with water. Open the nearest hot water faucet to allow
air to escape. Water must fl ow from the hot water faucet
before turning “ON” gas to the water heater.
To fi ll the water heater with water:
Close the water heater drain valve by turning the
handle to the right (clockwise). The drain valve is on
the lower front of the water heater.
Open the cold water supply valve to the water heater tank.
NOTE: The cold water supply valve must be left
open when the water heater is in use.
To insure complete fi lling of the tank, allow air to exit
by opening the nearest hot water faucet. Allow water
to run until a constant fl ow is obtained. This will let air
out of the water heater and the piping.
Check all water piping and connections for leaks.
Repair as needed.
VENTING
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