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Start Up Conditions
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system, the volume of water will increase. As the volume of
water increases, 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. Thermal expansion tanks are available from Sears
stores and through the Sears Service Centers. Contact the local
plumbing inspector, water supplier and/or the Sears Service
Center regarding the installation of a thermal expansion tank.
Table 2: Thermal Expansion Tank Specifi cations
Tank
Model
Capacity
Number
In Gallons
Diameter
153.331021
2
8 (203 mm)
153.331051
5
11 (279 mm)
Table 3: Expansion Tank Sizing Chart
Inlet*
Water
Expansion
Pressure
Tank
Capacity
40 psi
Needed
50 psi
60 psi
70 psi
80 psi
*Highest recorded inlet water pressure in a 24 hour period or
regulated water pressure.
NOTE: Expansion tanks are pre-charged with a 40 psi air
charge. If the inlet water pressure is higher than 40 psi, the
expansion tank's air pressure must be adjusted to match
that pressure, but must not be higher than 80 psi.
TROUBLESHOOTING
Dimensions
Pipe
in Inches
Fitting
Length
On Tank
12-3/4 (323 mm)
3/4" Male
14-3/4 (375 mm)
3/4" Male
Water Heater Capacity (Gallons)
30
40
50
66
2
2
2
5
2
2
2
5
2
2
5
5
2
2
5
5
2
5
5
5
STRANGE SOUNDS
Possible noises due to expansion and contraction of some metal
parts during periods of heat-up and cool-down do not represent
harmful or dangerous conditions.
Operational Conditions
SMELLY WATER
In each glass-lined water heater there is installed one anode
rod (see parts section) for corrosion protection of the tank.
Certain water conditions will cause a reaction between this rod
and the water. The most common complaint associated with the
anode rod is one of a "rotten egg smell." This odor is derived
from hydrogen sulfi de gas dissolved in the water. The smell is
the result of four factors which must all be present for the odor
to develop:
82
A. A concentration of sulfate in the supply water.
5
5
B. Little or no dissolved oxygen in the water.
5
C. A sulfate reducing bacteria within the water heater. (This
5
harmless bacteria is non-toxic to humans.)
5
D. An excess of active hydrogen in the tank. This is caused by
corrosion protective action of the anode.
Smelly water may be eliminated or reduced in some water heater
models by replacing the anode rod (s) with one of less active
material, and then chlorinating the water heater tank and all hot
water lines. Contact the local Sears Service Center for further
information concerning an Anode Replacement Kit #9001453
and this Chlorination Treatment. Anode replacement and
chlorination of the tank are not covered by the water heater's
limited warranty.
If the smelly water persists after the anode replacement and
chlorination treatment; then you should consider chlorinating or
aerating your water supply.
22
FIGURE 32.
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