Kenmore 33125 Owners Manual - Page 26

Start Up Conditions Thermal Expansion 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. Property Damage Hazard • Avoid water heater damage. • Install thermal expansion tank or device if necessary. = Contact qualified installer or service agency. Hr_r _,, r_ WATER HEATER r,n/r_ / COLD WATER -_v_%/,_ INLET FiTTiNG __ II (3) PRESSURE REDUCING VALVEWiTH BY-PASS 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 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. PRESSURE GAUGE WATER SHUT-OFF . RECOMMENDED INSTALLATION (VERTICAL MOUNTING) WATER COLD INLET HEATER WATER FiTTiNG HOT COLD (t) EXPANSION TANK_ (3) PRESSURE REDUCING VALVEWiTH BY-PASS j 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 Service Center for assistance in controlling see Figure 34. and/or the Sears these situations, Thermal Expansion Tank Specifications PRESSURE GAUGE _NLETCOLD WATER SHUT"OFF ALTERNATE RECOMMENDED iNSTALLATION (HORIZONTAL MOUNTING) Strange Sounds FIGURE 34, Model Number I53.331020 I53.331050 Tank Capacity In Gallons 2 5 Dimensions in Inches Diameter Length 8 (203 ram) 12-3/4 (323 ram) Pipe Fitting On Tank 3/4" Mate 11 (279 ram) 14-3/4 (375 ram) 3/4" Mate Expansion Tank Capacity Needed Expansion Tank Sizing Chart Inlet* Water Pressure Water Heater Capacity (Gallons) 30 40 50 66 82 40 psi 2 2 2 5 5 50 psi 2 2 2 5 5 60 psi 2 2 2 5 5 70 psi 2 2 5 5 5 80 psi 2 5 5 5 5 *Highest recorded inlet water pressure in a 24 hour period or regulated water pressure. 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 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 after 15 minutes of burner operation, shut off water heater and make necessary air supply changes to correct. 26