4
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,
500 Tennessee Waltz Parkway, Ashland City, TN 37055. Contact us at
our website: www.aosmithwaterheaters.com,phone: 800.433.2545,
or fax: 1.800.433.2515.
Water heater life depends upon water quality, water pressure
and the environment in which the water heater is installed.
Water heaters are sometimes installed in locations where
leakage may result in property damage, even with the use of a
drain pan piped to a drain. However, unanticipated damage
can be reduced or prevented by a leak detector or water shut-off
device used in conjunction with a piped drain pan. These
devices are available from some plumbing supply
wholesalers and retailers, and detect and react to leakage in
various ways:
•
Sensors mounted in the drain pan that trigger an alarm or
turn off the incoming water to the water heater when leakage
is detected.
•
Sensors mounted in the drain pan that turn off the water
supply to the entire home when water is detected in the
drain pan.
•
Water supply shut-off devices that activate based on the
water pressure differential between the cold water and hot
water pipes connected to the water heater.
•
Devices that will turn off the gas supply to a gas water heater
while at the same time shutting off its water supply.
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, see Figure 2
for suggested piping arrangement.
FIGURE 2
CLOSED WATER SYSTEM
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
Figure 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.
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 adhesives 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 install water 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.
