Start Up Conditions
Thermal Expansion
Property Damage Hazard
- Avoid water heater damage.
o 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
valves, back flow preventers, etc., to control these types of
problems. When these devices are not equipped with an internal
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
reached, the valve will relief the excess pressure. 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
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 26.
Therma! Expansion Tank Specifications
| Tank | Dimensions | Pipe | |
Mode_ | Capacity | in | Inches | Fitting |
Number | iln Gallons | Diameter | Length | On Tank |
153.331020 | 2 | 8 (203 ram) | 3/4" Mate | |
153.331050 | 5 | 11 (279 mm) | 3/4" Mate |
| Expansion | Tank | Sizing | Chart |
|
|
| h[et* | Water | Heater | Capacity |
| (Gallons) |
| Water |
|
|
|
|
|
| Pressure | 30 | 40 | 50 | 66 | 80 |
Expansion | 40psi | 2 | 2 | 2 | 5 | 5 |
Tank | 50psi | 2 | 2 | 2 | 5 | 5 |
Capacity | 60psi | 2 | 2 | 5 | 5 | 5 |
Needed | 70psi | 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 preocharged with a 40 psi air
charge, mfthe intact 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) |
(VERTICAL MOUNTING)
WATER | HEATER |
|
COLD | WATER |
|
INLET | HTTING | FLOOR, CEILING JOBST, ETC, |
HOT COLD
(3)
PRESSURE
REDUCING
VALVE WITH
(1_BY-PASS
EXPANSIONJ
TANK :_
t
INLETCOLD
WATER SHUT=OFF
ALTERNATE RECOMMENDED INSTALLATION
(HORIZONTAL MOUNTING)
F_GURE2&
Strange Sounds
Possible noises due to expansion and contraction of some
metal parts during periods of
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
23