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Troubleshooting Guide
Start Up Conditions
THERHAL EXPANSION
W_.rer supply systems may, because of high line pressure, fre-
quent cut_offs, the effects of water hammer and others, have
installed devices such as pressure reducing valves, check valves,
back flow preventers, 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 sys-
tem to be closed. As water is heated, it expands (thermal expan-
sion) and closed systems do not allow for the expansion of heat-
ed water.
The water within the water heater tank expands as it is heated
and increases the pressure of the water system. If the relie_'ing
point of the water heater's temperature-pressure relief valve is
reached, the valve will relieve the excess pressure. The tempera-
ture-pressure relief valve is not intended for the constant
relief of thermal expansion. This is an unacceptable condition
and must be corrected.
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 in
the water system. Expansion tanks are available for ordering
through the Sears Service Center. Contact the local plumbing
inspector, water supplier, and/or the Sears Service Center for
assistance in controlling these situatior_s.
HOT COlD
WATER HEATER
COLD WATER
INLET FITTING
HOT COLD
WATER HEATER (3)
- COLD WATER PRESSURE
INLET FITTING REDUCING
VALVEWITH
BY-PASS
(i) 1
EXPANSION
TANK
(2) INLET COLFD
PRESSURE GAUGE
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
FLOOR, CEILING
JOIST,ETC,
Thermal Expansion Tank Specifications
t Model Tank Capacity Dimensions in lnche_ i,Pipe Fitting
Number In Gallons i Diameter i Length On Tank
53:33102() 2 8 inches [i2_ inches y i; Male
Fi53.33io50 ' 5 " i-ll inches :14_ inches _" Male
Expansion Tank Sizing Chart
Expansion
Tank
Capacity
Needed
Inlet* Water Heater Capacity (Gallons)
iWater
Pressure 30 i 40 1 50 1 66 i 82
40psi 2 2 2 5 5 "
50psi 2 2 2 5 5
60psi 2 2 5 5 5
!70psi 2 2 5 5 5
80psi 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.
(I)
EXPANSION
(3)
PRESSURE
REDUCING INLET COLD
VALVEWITH WATER
BY-PASS SHUTOFF
(21
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
normal. See "Condensation" section.
22
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