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Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water supply systems may, because of such events as high line
pressure, f[equent cut-offs, the effects of water hammer among
others, have installed devices such as pressure reducing valves,
check valves, back flowpreventers, etc._to control these types of
problems. When these devices are not equipped with an internal
by-pass, and no other measures are taken, the devices cause the
water system to be closed. As water is heated, it expands (ther-
mal expansion) and closed systems do not allow for the expan-
sion of heated water.
The water within the water heater tank expands asit is heated and
increases the pressure of the water system. If the relieving _oint of
the water heater s temperature-pressure relief valve is reached, the
valve will relieve the excesspressure. The tempera_premure
relief valve is not intendedfor the constant relief of thermal
expansion. This is an unacceptable condition and must be cor-
rected.
It is recommended that any devices installed which could create a
dosed system have a by-pass and/or the system have an expan-
sion tank to relieve the pressure built by 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
assistancein controlling these situations.
Thermal Expansion Tank Specifications
Model Tank Capacity Dimensions in Inches Pipe Fitting
Number In Gallons Diameter Length On Tank
153.331020 2 8 inches 12_ inches _" Male
153.331050 5 11 inches 14_ inches _" Male
HOT COLD WATER HEATER
COLD WATER
;;_ INLET FITTING
O)
PRESSURE
REDUCING
VALVE
BY.PASS
0) 1
EXPANSION
TANK
O)
PRESSUREGAUGE
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
WATER HEA1TcR
COLD WATER
INLET FITTING
FLOOR, CIEIUNG
joist, ETC.
HOT
COLD
STRAPPING
(I)
EXPAN_ON
0)
PRESSURE
REDUCING INLET COLD
VALVEWITH WATER
BYPASS SHUTOFF
Expansion Tank Sizing Chart
Water Heater Capacity (Gallons)
Inle_
Water
Pressure
40psi
50psi
60psi
70psi
80psi
Expansion 30 40 50 66 82
Tank 2 2 2 5 5
Capacity 2 2 2 5 5
Needed 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 tanks air pressure must be adjusted to match that
pressure, but must not be higher than 80 psi.
(2)
PRESSURE GAUGE
ALTERNATE RECOMMENDED
INSTALLATION
(HORIZONTAL MOUNTING)
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 ordangerous conditions.
18
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