Kenmore 153.31242 - Manual (Page 19)

TROUBLESHOOTING
Start Up Conditions
THERMAL EXPANSION
CAUTION
Property Damage Hazard
' Avoid water heater damage.
' Install thermal expansion tank or device if necessary.
' Contact qualified installer or service agency.
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. 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 for assistance in controlling these situations.
Table 2: Thermal Expansion Tank Specifications
Model Tank Dimensions Pipe
Number in Inches Fitting
Diameter Length
On Tank
153.331020 2 8 (203 mm) 12-3/4” (323 mm) 3/4” Male
153.331050 5 11 (279 mm) 14-3/4” (375 mm) 3/4” Male
Table 3: Expansion Tank Sizing Chart
Expansion
Tank
Capacity
Needed
Inlet*
Water
Pressure
Water Heater Capacity
(Gallon)
30 40 50 66 82
40psi 2 2 2 5 5
50psi 2 2 2 5 5
60psi 2 2 5 5 5
70psi 2 2 5 5 5
SOpsi 2 5 5 5 5
‘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.
WATER HEATER
COLD WATER
INLET FITTIMO FLOOR, CEILING
JOIST, ETC.
FIGURE 43.
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 sulfide gas dissolved in the water. The smell is
the result of four factors which must all be present for the odor
to develop:
A. A concentration of sulfate in the supply water.
B. Little or no dissolved oxygen in the water.
C. A sulfate reducing bacteria within the water heater. (This
harmless bacteria is non-toxic to humans.)
D. An excess of active hydrogen in the tank. This is caused by
corrosion protective action of the anode.
19