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Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water 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 relieving
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
reli_ 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 situations.
HOT COLD
HOT
WATER HEATER
COLD WATER
INLET Fn-rlNG
WATERHEATER
• COLDWATER (3)
INl.b-rFITnNG PRESSURE
REDUCING
VALVEWITH
BY-PASS
O) !
EXPANSION
TANK
PRESSUREGAUGE
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
FLOOR,CEILING
joist, ETC.
STRAPPING
Thermal Expansion Tank Specifications
Model ITank Capacity Dimensions in Inches_ Pipe Fitting [
Number In Gallons Diafneter Leng_ II On Tank J
1_0 2 8 in ch_ i!2_in_esi_ _,/}iMale[iil
i53..3-3_50 5 11 inches il4_inches[ _ Male |
(i)
EXPANSION
(3)
PRESSURE
REDUCING INLETCOLD
VALVEWITH WATER
BY-PASS SHUTOFF
Expansion Tank Sizing Chart
Expansion
Tank
Capacity
Needed
Inlet*
Water
t Pressure
40psi
50psi
60psi
70psi
80psi
Water Heater Capacity (Gallons)
2 --2 ; 2 5 5
2 2 5 5 5
2 2 5 5 5
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 me !Met 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.
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
narmful or dangerous conditions.
Condensation causes sizzling and popping with the burner area
during heat!,ng and coolin[_ periods and should be considered
normal. See Condensation section.
22
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