Installation Requirements; Chemical Vapor Corrosion; Water Piping; Power Supply - A.O. Smith 300 Series Instruction Manual

CHEMICAL VAPOR CORROSION

Corrosion of the flueways and vent system may occur if air for
combustion contains certain chemical vapors. Such corrosion may
result in failure and risk of asphyxiation.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium and
sodium chloride (water softener salt), waxes, and process chemicals
are typical compounds which are potentially corrosive.
Do not store products of this sort near the heater. Also, air which is
brought in contact with the heater should not contain any of these
chemicals. If necessary, uncontaminated air should be obtained
from remote or outside sources. The limited warranty is voided when
failure of water heater is due to a corrosive atmosphere. (See limited
warranty for complete terms and conditions).

WATER PIPING

HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the physically or developmentally disabled. If
anyone using hot water fits into one of these groups or if there is a
local code or state law requiring a certain temperature water at the
hot water tap, then you must take special precautions. In addition
to using the lowest possible temperature setting that satisfies your
hot water needs, a means, such as a mixing valve, can be used at
the hot water taps used by these people. Valves for reducing point
of use temperature by mixing cold and hot water are also available:
Check State and/or local codes for mixing valve requirements and
installation practices.
Consult a Qualified Installer or Service Agency. Follow manufacturer's
instructions for installation of the valves. Before changing the factory
setting on the thermostat, read the Temperature Regulation section
in this manual.

INSTALLATION REQUIREMENTS

INSTALLATION REQUIREMENTS
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
WARNING
Toxic Chemical Hazard
● Do not connect to non-potable water
system.
This water heater shall not be connected to any heating systems
or component(s) used with a non-potable water heating appliance.
All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment shall not
be introduced into this system.
When the system requires water for space heating at temperatures
higher than required for domestic water purposes, a mixing valve
must be installed.
These water heaters cannot be used in space heating applications
only.

POWER SUPPLY

The water heaters covered in this manual require a 120 VAC,
1Ø (single phase), 60 Hz, 5 amp power supply and must also
be electrically grounded in accordance with local codes or, in the
absence of local codes, with CSA C22.1, the Canadian Electrical Code.
If any of the original wire as supplied with the water heater must
be replaced, it must be replaced with 105°C rated wiring or its
equivalent, except in the burner housing. In this case 200°C rated
wire must be used.

DEDICATED POWER WIRING AND BREAKERS

Dedicated power supply wires, ground wiring and dedicated circuit
breakers often prevent electrical line noise and should be considered
when installing the water heater.
Note: This water heater should not be connected to an electrical
supply with a Ground Fault Circuit Interrupter (GFCI) or Arc
Fault Circuit Interrupter (AFCI) with Integral GFCI protection
as defined in NFPA 70, CSA C22.1 and UL 943.

POWER FLUCTUATIONS AND ELECTRICAL NOISE

The water heater's control system requires a source of stable
clean electricity for proper operation. Connecting the water heater
to a branch circuit that is subject to fluctuations in voltage level or
electrical line noise such as EMI (electro magnetic interference) or
RFI (radio frequency interference) may cause erratic control system
operation and malfunction.
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Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.