Troubleshooting guide, Start up conditions, Thermal expansion – Kenmore 153.335963 User Manual
Page 31: Thermal expansion tank specifications, Expansion tank sizing chart, Strange sounds
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Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
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 (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
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
cor
rected.
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.
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 Capacity | Dimensions in Inches i Pipe Fitting
; Diameter Length | On Tank
8
inches i 12X inches'
V."
Male
In Gallons
2
5
11 inches 14У, inches У/ Male
Expansion Tank Sizing Chart
; Inlet*
■ Water
Water Heater Capacity (Gallons)
Expansion
Tank
Pressure
30
40
50
66
'
82
40psi
2
2
2
5
5
Capacity
50psi
:
2
2
2
5
5
Needed
60psi
i
2
2
5
5
5
70psi
1
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
tank’s
air
pressure
must
be
adjusted
to
match
that
pressure, but must not be higher than 80 psi.
HOT
COLD WATER HEATER
COLD WATER
(3)
PRESSURE
REDUCING
VALVE WITH
BY-PASS
(I)
EXPANSION
TANK
(
2
)
^
f
PRESSURE GAUGE 'NLET COLD
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
WATER HEATER
COLD WATER
INLET FITTING
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.
Condensation
causes
sizzling
and
popping
with
the
burner
area
during
heating
and
coo!in|
periods
and
should
be
considered
normi. See “Condensation’ section.
31