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Chemical vapor corrosion of the flue and vent system may occur
if air for combustion contains certain chemical vapors. Spray
can propellants, cleaning solvents, refrigerator and air
conditioner refrigerants, swimming pool chemicals, calcium and
sodium chloride, waxes, bleach and process chemicals are
typical compounds which are potentially corrosive.
Gas Piping
Make sure the gas supplied is the same type listed on the model
rating plate. The inlet gas pressure must not exceed
14 inch water column (3.5kPa) for natural gas. The minimum
inlet gas pressure listed on the rating plate is for the purpose of
input adjustment. If the gas control valve is subjected to
pressures exceeding 1/2 pound per square inch (3.5kPa), the
damage to the gas control valve could result in a fire or explosion
from leaking gas.
If the main gas line shut-off serving all gas appliances is used,
also turn “OFF” the gas at each appliance. Leave all gas
appliances shut “OFF” until the water heater installation is
complete.
A gas line of sufficient size must be run to the water heater.
Consult the current edition of National Fuel Gas Code
ANSI Z223.1/NFPA 54 and your gas supplier concerning pipe
size.
There must be:
• A readily accessible manual shut off valve in the gas supply
line serving the water heater, and
• A drip leg (sediment trap) ahead of the gas control valve to
help prevent dirt and foreign materials from entering the gas
control valve.
• A flexible gas connector or a ground joint union between the
shut off valve and control valve to permit servicing of the unit.
Be sure to check all the gas piping for leaks before lighting the
water heater. Use a soapy water solution, not a match or open
flame. Rinse off soapy solution and wipe dry.
The minimum inlet gas pressure shown on the rating plate is
that which will permit firing at the rated input.
If a standard model is installed above 2,000 feet (610 m) the
input rating should be reduced at the rate of 4 percent for each
1,000 feet (305 m ) above sea level which requires replacement
of the burner orifice in accordance with National Fuel Gas Code
ANSI Z223.1/NFPA 54. Contact your local Sears Service Center
or local gas supplier for further information.
Failure to replace the standard orifice with a high altitude orifice
when installed at elevations above 2,000 feet (610 m) could
result in improper and inefficient operation of the appliance,
producing carbon monoxide gas in excess of safe limits, which
could result in serious injury or death. Contact your local Sears
Service Center or local gas supplier for any specific changes
which may be required in your area.
The appliance and its gas connection must be leak tested before
placing the appliance in operation.