Loading ...
Loading ...
Loading ...
Start Up Conditions
THERMAL EXPANSION
Property Damage Hazard
• Avoid water heater damage.
• Install thermal expansion tank or device if necessary.
• Contact qualified installer or service agency.
Water supply systems may, because of such events as high
line pressure, frequent cut-offs, the effects of water hammer
among 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 system to be closed. As water is heated,
it expands (thermal expansion) and closed systems do not allow
for the expansion 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
temperature-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
expansion tank to relieve the pressure built by thermal expansion
in the water system. Thermal expansion tanks are 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
153.331020
153.331050
Tank Dimensions
Capacity in inches
In Gallons Diameter Length
2 8 (203 mm) 12-3/4 (323 mm)
5 11I (279 mm) 14-3/4 (375 mm)
Pipe
Fitting
On Tank
3/4" Mate
3/4" Mate
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
_ _k_ COLD WATER
INLET FITTING
13)
PRESSURE
REDUCING
VALVEWITH
BY-PASS
(2) '___
PRESSURE GAUGE INLET COLD
WATER SHUT-OFF
RECOMMENDEDiNSTALLATION
............. _ (VERTICAL MOUNTING)
WATER HEATER
COLD WATER
iNLET FITTING FLOOR, CEILING JO[ST, ETC.
\
Zlb'--'"'°,,
__/ II II I1\ PRESSURE
1,,_ II II II! REDUCING
H \ [III II/\ VALVEWITH
[[ "-¢J---u--_L_-- (I) BY-PASS
II EXPANSION _,/
_. TANK_
.,I t
PRESSURE GAUGE iNLET COLD
WATER SHUT-OFF
ALTERNATE RECOMMENDED INSTALLATION
-- _ -- (HORIZONTALMOUNTING)
FIGURE 43.
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.
Operational Conditions
SMELLY WATER
Expansion Tank Sizing Chart
Water Heater Capacity (Gallons)
inlet*
Water
Pressure
40psi
50psi
60psi
70psi
80psi
30 40 50 66 82
Expansion 2 2 2 5 5
Tank 2 2 2 5 5
Capacity 2 2 5 5 5
Needed 2 2 5 5 5
2 5 5 5 5
In each glass-lined water heater there is installed one anode rod
(see parts section) for corrosion protection of the tank. Certain
water conditions will cause a reaction between this rod and the
water. The most common complaint associated with the anode
rod is one of a "rotten egg smell". This odor is derived from
hydrogen sulfide gas dissolved in the water. The smell is the result
of four factors which must all be present for the odor to develop:
A. A concentration of sulfate in the supply water.
B. Little or no dissolved oxygen in the water.
*Highest recorded inlet water pressure in a 24 hour period or
regulated water pressure.
C. A sulfate reducing bacteria within the water heater. (This
harmless bacteria is non-toxic to humans.)
23
Loading ...
Loading ...
Loading ...