Troubleshooting guide, Start up conditions, Thermal expansion – Kenmore 153.327366 User Manual
Page 21: Strange sounds
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Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water sujyjlj? systems may, because of such events as high line
pressure, frequent cut-ofFs, the efFects of water hammer among
others, iiave instiled devices such as pressure reducing valves,
check valves, back flow prevemers, etc.-to control these types of
■roblettis, these devices are not equipped with art internal
if-pass. and no other measures arc talcen, trie 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 temperatiure-pressixre
relief valve is not intended for the constant relief of tbecnjal
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 Scars Service Center for
assistance in controlling these situations.
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Model
Tank Capacity
In Gallons
Dimensions in Inches
Pipe Fitting
Number
Diameter
Length
□n Tank
153.331020
2
8 inches
121^ inches
y/'
Male
1 153.331030
5
11 inches
l4V^
inches
y/'
Male
Expansion Tank Sizing Chart
Expansion
Tank
Capacii
Needei
inier*
Pressure
Water Heater Capacity (Gallons)
30
40
50
66
82
40psi
2
2
2
5
5
50psi
2
2
2
5
5
60psi
2
2
5
5
5
?0psi
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
COLO WATER
INLET FITTING
FLOOR, CEILING
JOIST, ETC.
STRANGE SOUNDS
Possible noises due to expansion and contraction of some metal
parts during periods of heapup and cool-down do not represent
harmful or dangerous conditions.
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