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the heater. Such pans should have a minimum length and width
of at least 2 inches greater than the diameter of the heater and
should be piped to an adequate drain. Drain pans suitable for
these heaters are available from your dealer or A. O. Smith Water
Products Company, 5621 W. 115th Street, Alsip, IL 60803. Contact
us at our website: www.hotwater.com, phone: 800.433.2545,
or fax: 1.800.433.2515.
Under no circumstances is the manufacturer to be held liable for
any water damage in connection with this water heater.
The location selection must provide adequate clearances for
servicing and proper operation of the water heater.
WARNING
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT. Instead the
water heater must be placed on a metal or wood panel extending
beyond the full width and depth by at least 3 inches (76.2mm) in
any direction. If the heater is installed in a carpeted alcove or
closet, the entire floor shall be covered by the panel.
Refer to figure 1 for typical installation. A suitable pipe thread
sealant must be used to prevent leakage.
WATER (POTABLE) HEATING AND SPACE HEATING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer to
Fig. 2 for suggested piping arrangement.
CLOSED WATER SYSTEM
FIGURE 2
A closed system will exist if a back-flow preventer (check valve),
pressure reducing valve, or other similar device is installed in the
cold water line between the water heater and the street main (or
well). Excessive pressure may develop due to the thermal
expansion of heated water causing premature tank failure or
intermittent relief valve operation.
This type of failure is not
covered by the limited warranty. An expansion tank may be
necessary in the cold water supply to alleviate this situation, see
fig. 1. Contact the local plumbing authority.
If the temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion in a
closed water supply system. Contact the water supplier or local
plumbing inspector on how to correct this situation. DO NOT
PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.
GAS CONNECTIONS
The minimum gas supply pressure for input adjustment is 5.0”
W.C. (1.2 kPa) for natural gas and 11.0” W.C. for propane gas.
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 10.5” WATER COLUMN (2.6 kPa) SUPPLY PRESSURE.
EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE
DAMAGE TO THE CONTROL WHICH COULD RESULT IN FIRE
OR EXPLOSION. If over-pressure has occurred such as through
improper testing of gas lines or emergency malfunction of the
supply system, the control must be checked for safe operation.
Make sure that the outside vents on the supply regulators and the
safety vent valves are protected against blockage. These are
parts of the gas supply system not the heater. Vent blockage may
occur during ice storms.
IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING
FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING
MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
All piping must comply with local codes and ordinances or with
the current edition of National Fuel Gas Code (ANSI Z223.1/NFPA-
54) whichever applies.
REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE
ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS
CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS
SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG)
MUST BE INCORPORATED IN THE PIPING, FIG. 1. The dirt leg
must be readily accessible. Install in accordance with
recommendations of serving gas supplier. Refer to the latest
edition of the National Fuel Gas Code ANSI Z223.1.
To prevent damage, care must be taken not to apply too much
Vapors from flammable
liquids may explode and catch
fire causing death or severe
burns.
Do not use or store flammable
products such as gasoline,
solvents or adhessives in the
same room or area near the water
heater.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
4. out of children’s reach.
Installation:
Do not installwater heater where
flammable products will be stored
or used unless the main burner
and pilot flames are at least 18”
Water heater has a main burner
and pilot flame. The pilot flame:
1. is on all the time and
2. will ignite flammable vapors.
Vapors:
1. cannot be seen,
2. are heavier than air,
3. go a long way on the floor
and
4. can be carried from other
rooms to the pilot flame by
air currents.
above the floor. This will
reduce, but not eliminate the
risk of vapors being ignited by
the main burner or pilot flame.