Kenmore 153.337613 - Manual (Page 23)

Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water suMiy systems may, because of such events as high line
pr^ure, frequent cut-offs, the effects of water hammer among
others, have installed devices such as pressure reducing valves,
check valve^ back flow preventers, etc...to control these types of
problems, men 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 eimansion) and closed systems do not allow for the expan­
sion or heated water.
^e 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
vidye wiU relieve the excess pressure. The temperature-pressure
rehef valve w not mtended for the constant relief of thermal
cxpauion. This IS an unacceptable condition and must be cor­
rected.
It IS recommended that any devices installed which could create a
dosed sj^tem have a by-pass and/or the system have an expan­
won tank to relieve the pressure built by thermal expansion.
I hcrmal expansion tanks arc 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
Number
Tank Capacity
In Gallons
Dimensions in Inches Pipe Fitting
On Tank Diameter Length
153.331020 2 8 inches 12?^ inches Male
153.331050 5 11 inches 14% inches %" Male
Expansion Tank Sizing Chart
Expansion
Tank
Capacity
Needed
Inlet*
Water
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
70psi 2 r 2 r 5 5 5
80psi 2 5 5 5 5
- „„Cl waicr pressure in a nour period or
regulated water pressure.
NOTE: Expansion tanks are pre-charged with a 40 psi air
charge. II 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 WATER HEATER
COLD WATER
INLET FITTING
(I)
EXPANSION
TANK
P)
PRESSURE
REDUCING
VALVE WITH
BVn\$S
I
P)
PRESSURE GAUGE INLET collo
WATER
SHUTOFF
RECOMMENDED INSTALLAHON
(VERTICAL MOUNTING)
WATER HEATER
COLD WATER
INLET FITTING FLOOR, CEILING
JOIST ETC.
STRANGE SOUNDS
Possible noises due to expansion and contraction of some metal
parts during periods of heat-up and cool-down do not represent
harmrul or dangerous conditions.
Condensation causes sizzling and popping with the burner area
during heating and cooling periods and should be considered
normal. See Condensation section,
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