Loading ...
Loading ...
Loading ...
Troubleshooting Guide
Start Up Conditions
THERMAL EXPANSION
Water supply systems may, because of such events as high line
pressure, frequent cut-off_, 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
_roblems. When these devices are not equipped with an internal
y-pass, and no other measures are taken, the devices cause the
water system to be dosed. As water is heated, it expands (ther-
mal expansion) and dosed 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 tempera-
ture-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 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 "I_mkCapacity Dimensionfi in Inches Pipe Fitting
Number In Gallons Diameter ] Length ] On *lhnk
153.331020 2 8 inches ]12_ inches] _"Male
HOT COLD
WATER HEATER
COLD WATER
INLET FITTING
MOT COLD
WATER HEATER (3)
COLD WATER PRESSURE
,INLET FITTING REDUCING
VALVEWITH
BY-PASS
0)
EXPANSION
TANK
(z)
PRESSUREGAUGE
WATER
SHUTOFF
RECOMMENDED INSTALLATION
(VERTICAL MOUNTING)
FLOOR,CEILING
JOIST,ETC.
STRAPPING
(i)
EXPANSION
TANK
O)
PRESSURE
REDUCING INLET COLD
VALVEWITH WATER
BY-PASS SHUTOFF
Expansion Tank Sizing Chart
Expansion
"Ihnk
Capacity
Needed
Inlet*
Water
Pressure
40psi
50psi
60psi
70psi
80psi
Water Heater Capacity (Gallons)
6 10 19.9 30
2 2 2 2
2 2 2 2
2 2 2 2
2 2 2 2
2 2 2 2
*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 higJ.herthan 40 psi, the
expansion tanks air pressure must be adjusted to match that
pressure, but must not be higher than 80 psi.
(2)
PRESSUREGAUGE
ALTERNATE RECOMMENDED
INSTALLATION
(HORIZONTAL MOUNTING)
STRANGE SOUNDS
Possible noises due to expansion and contraction of"some metal
_arts during periods of heat-up and cool-down do not represent
armful or dangerous conditions.
18
Loading ...
Loading ...
Loading ...