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Start Up Conditions
THERMAL EXPANSION
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, itexpands (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.
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.
HOT COLD HEATER
COLD WATER PRESSURE
INLET FITTING REDUCING
VALVE WITH
BY*PASS
WATER
SHUTOFF
6 INCH
MAXIMUM AIR GAP ___ RECOMMENDED INSTALLATION
I (VERTICAL MOUNTING)
WATER HEATER FLOOR, CEILING
COLD WATER JOIST, ETC.
INLET FITTING
HOT COLD STRAPPING
6INCH
PRESSURE
REDUCING INLET COLD
VALVE WlTH WATER
EXPANSfON BY=PASS SHUTOFF
TANK
PRESSURE GAUGE
ALTERNATE RECOMMENDED
INSTALLATION
(HORIZONTAL MOUNTING)
Thermal Expansion Tank Specifications
Table 2:
Model
Number
153.331021
153.331051
Tank Dimensions Pipe
Capacity in Inches Fitting
In Gallons Diameter Len_lth On Tank
2 8 (203 mm) 12-3/4 (323 mm) 3/4" Male
5 11 (279 mm', 14-3/4 (375 mm) 3/4" Male
Expansion Tank Sizing Chart
Table 3:
Water Heater Capacity (Gallons'
Inlet*
Water
Pressure
40psi
50psi
60psi
70psi
80psi
30 40 50 66 82
Expansion 2 2 2 5 5
Tank 2 2 2 5 5
Capacity 2 2 5 5 5
Needed 2 2 5 5 5
2 5 5 5 5
*Highest recorded inlet water pressure in a 24 hour period or
regulated water pressure.
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 isinstalled 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 isthe 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.
24
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