Troubleshooting Guide; Start Up Conditions; Thermal Expansion; Strange Sounds - Kenmore 33968 - Power Miser 9 Specification

Gas water heater
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Start
Uj_ 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
system
may, because
of such events
as high line
pressure,
frequent
cut-offs
and the effects of water hammer
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 water
heater's
temperature-pressure
relief valve
is reached,
the valve
will relief
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
or device
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,
see Figure
27.
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
(3)
HOT
COLD /
COLDWATER
PRESSURE
r=====_-m
_
_
iNLET FiTTiNG
REDUCING
I
(z)
PRESSURE GAUGE
WATER SHUT-OFF
=RECOMMENDED
iNSTALLATiON
_VERTICAL
MOUNTING)
WATER
HEATER
COLD
WATER
iNLET
FiTTiNG
FLOOR,
CEILING
JOIST,
ETC.
\
OT
COLD
_
STRAPPING
EXPANSION
d/
/
t
I
PRESSURE
GAUGE
iNLET
COLD
WATER
SHUT-OFF
ALTERNATE
RECOMMENDED
INSTALLATION
--
--
(HORIZONTAL
MOUNTING)
Thermal
Expansion
Tank Specifications
Mode!
Number
153.331020
153.331050
Tank
Capacity
In Gallons
2
5
Dimensions
Pipe
in Inches
Fitting
Diameter
Lentth
On Tank
8 (203 mm)
12-3/4 (323 mm) 3/4" Male
11 (279 mm) 14-3/4 (375 mm) 3/4" Male
FIGURE 27.
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.
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
Condensation
causes
sizzling and popping within the burner area
during
heating
and cooling
periods
and should
be considered
normal.
See Condensation
section.
Draft Hood Operation
Check
draft
hood
operation
by
performing
a worst
case
depressurization
of the building.
With all doors
and windows
closed,
and with
all air handling
equipment
and exhaust
fans
operating
such as furnaces,
clothes
dryers,
range
hoods
and
bathroom
fans, a match flame should
still be drawn
into the draft
hood of the water heater
with its burner firing.
If the flame is not
drawn
toward
the draft hood,
shut off water
heater
and make
necessary
air supply
changes
to correct.
*Highest
recorded
inlet water
pressure
in a 24 hour period
or
regulated
water pressure.
23

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