Installing The Water Heater; Chemical Vapor Corrosion; Water Piping - A.O. Smith GPS-75 Instruction Manual

InstallInG the new water heater

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 infirm, or physically/mentally handicapped. If
anyone using hot water in your home 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, should be used at the
hot water taps used by these people or at the water heater, see Figure
2. Valves for reducing point of use temperature by mixing cold and hot
water are also available.
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.
This water heater should 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 should be suitable for use with potable water.
Toxic chemicals such as those used for boiler treatment, should 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. Please refer to Figure 2 for suggested piping arrangement.
As water is heated, it expands (thermal expansion). In a closed
system, the volume of water will grow. As the volume of water
grows, there will be a corresponding increase in water pressure due
to thermal expansion. Thermal expansion can cause premature
tank failure (leakage). This type of failure is not covered under the
limited warranty. Thermal expansion can also cause intermittent
temperature-pressure relief valve operation: water discharged from
the valve due to excessive pressure build up. The temperature-
pressure relief valve is not intended for the constant relief of
thermal expansion. This condition is not covered under the limited
warranty.
A properly-sized thermal expansion tank should be installed
on all closed systems to control the harmful effects of thermal
expansion. Contact a local plumbing service agency to have a
thermal expansion tank installed..
note: to protect against untimely corrosion of hot and cold
water fittings, it is strongly recommended that di-electric
unions or couplings be installed on this water heater when
connected to copper pipe.
All gas piping must comply with local codes and ordinances or with
the National Fuel Gas Code (ANSI Z223.1/ NFPA-54). Copper and
brass tubing and fittings (except tin lined copper tubing) should
not be used.
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fIGure 9.