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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
VALVE WITH
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
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