Kenmore POWER MISER 153.32154 - Manual (Page 21)

Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water supply systems may, because of such events as high line
pressure, frequent cut-offt, the effects of water hammer among
others, have installed devices such as pressure reducing valves,
check valves, back flew preventers, etc,,,to control these types of
problems. When these devices arc not equipped with an internal
by-pass, and. no other measures arc 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
in creases the pressurc of the water sj’stem. If the rel ieving point of
the water heater's temperature-pressure relief valve is reached, the
valve will relieve the excess pressure. The teinperatune-piessiure
reHef valve is not inteud.ed for the constant relief of thermal
expansion. This is an unacccpable condition and must be cor­
rected.
It is rccommend.ed, that any d.evices 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 arc available from Scars stores and
through the Scars Service Centers, Contact the local plumbing
inspector, water supplier and/or the Scars Service Center for
assistance in controlling these situations.
Thermal Expansion Tank Specifications
Model Tank Capacitv Dimensions in Inches Pipe Fitting
Number In Gallons Diameter Length. On Tank
153.331020 8 inches 1 2% inches Male
153.331050 5 ■] ■] inches14% inches y/' Male
Expansion Tank Sizing Chart
Expansion
Tank
Capacity
Needed
Inlet*
Water
Pressure Water Heater Capacity (Gallons)
30 40 50 66 80
40 psi 5 5
50psi 2 5 5
60psi 2
j C. 5 5 5
70psi 2
j C. 5 5 5
80psi 2 5 5 5 5
*Highcst recorded inlet water pressure in a 24 hour period or
regulated, water pressure,
NOTE; Expansion tanks arc prc-chargcd 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
COLD WATER
INLET FITTIMG
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
harmful or dangerous conditions.