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Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water supply systems may, because of such events as high line
pressure, frequent 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 as it is heated and
increases the pressure of the water system. If the relieving point of
the water heater s temperature-pressure relief valve is reached, the
valve will relieve the excess pressure. The temperature-pressure
relief valve is not intended for 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
closed 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
assistance in controlling these situations.
Thermal Expansion Tank Specifications
Model i Tank CaDac ty Dimension,s in Inches Pipe Fitting
[ Number _ In Gallons !Diameter" Length On Tank
1153.3310207 2 • 8inches 712_incbes _;'Male
1153.33 050i 5 iHiochesil<inches Ma,e
HOT COLD
i_,*ii=====,_1
WATER HEATER
COLD WATER
INLET FITTING
HOT
COLD
WATER HEATER (3)
• COLD WATER PRESSURE
INLET FITTING REDUCING
VALVE WITH
BY-PASS
(i)
EXPANSION
TANK
(z)
PRESSUREGAUGE
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
FLOOR, CEILING
JOIST,ETC.
STRAPPING
(1)
EXPANSION
O)
PRESSURE
REDUCING INLET COLD
VALVEWITH WATER
BY-PASS SHUTOFF
Expansion Tank Sizing Chart
iInlet*
I
Water
Expansion
Tank
Capacity
Needed
Water Heater Capacity (Gallons)
Pressure l 30 i 40 ' 50 66
40psi 2 i 2 2 5
0psi [ 2 iT 5 1
76ps_ _ 2 ! 2 5 5 / 5
80psi i 2 5 5 : 5 5
*Highest recorded inlet water pressure m a 24 hour period or
regulated water pressure.
NOTE: Expansion tanks are we-charged with a 40 psi air
charge. If the inlet water pressure is hi_her than 40 psi, the
expansion tank's air pressure must be adjusted to match that
pressure, but must not be higher than 80 psi.
PRESSUREGAUGE
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 or dangerous conditions.
Condensation causes sizzling and popping with the burner area
during heating and cooling periods and should be considered
normah See "Condensation" section.
28
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