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Start Up Conditions
THERMAL EXPANSION
Property Damage Hazard
• Avoid water heater damage.
• Install thermal expansion tank ordevice if necessary.
• Contact qualified installer or service agency.
As water is heated, itexpands (thermal expansion). In a closed
system, the volume of water wilt grow. As the volume of water
grows, there wilt 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 3: Thermal Expansion Tank Specifications
Model Tank
Number Capacity
In Gallons
2
5
153.331020
153.331050
Dimensions
in Inches
Diameter Length
8 (203 mm) 12-3/4" (323 mm)
11 (279 mrn) 14-3/4" (375 mm)
Pipe
Fitting
On Tank
3/4"Male
3/4"Male
Table 4: Expansion Tank Sizing Chart
Inlet* Water Heater Capacity
Water (Gallon)
Pressure
30 40 50 66 82
Expansion
Tank
Capacity
Needed
40psi
50psi
60psi
70psi
80psi
2 2 2 5 5
2 2 2 5 5
2 2 5 5 5
2 2 5 5 5
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.
HOT COLD
COLD WATER PRESSURE
INLET FITTING REDUCING
VALVE WITH
BYPASS
61NCH
INLET COLD
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
WATER HEATER FLOOR, CEILING
COLD WATER JOIST, ETC_
INLET FITFING
HOT COLD STRAPPING
PRESSURE
REDUCING INLET COLD
VALVE WITH WATER
BY=PASS SHUTOFF
6INCH
PRESSURE GAUGE
ALTERNATE RECOMMENDED
INSTALLATION
(HORIZONTAL MOUNTING)
FIGURE 22.
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
POWERED ANODE ROD OPERATION
To shelter the glass-lined water tank from corrosion through
electrolysis, this water heater is equipped with a non-sacrificial
powered anode which should not need to be replaced under
normal operating conditions. NOTE: The powered anode oper-
ates only when electrical power isapplied.
If the powered anode malfunctions it should be replaced by a
qualified technician.
IMPORTANT: If a faulty powered anode is not repaired or has
been removed permanently, then all warranties are void.
21