Kenmore 153.33262, 153.33264 Start Up Conditions, Property Damage Hazard, Expansion, Tank Sizing

Start Up Conditions

Thermal Expansion

Property Damage Hazard

•Avoid water heater damage.

•Install thermal expansion tank or device if necessary.

•Contact qualified installer or service agency.

As water is heated, it expands (thermal expansion). In a

closed system, the volume of water wilt grow. As the volume of water grows, there wilt be a corresponding increase in water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty. Thermal expansion can also cause intermittent temperature-pressure relief valve operation: water discharged from the valve due to excessive pressure build up. The temperature-pressure relief valve is not intended for the constant relief of thermal expansion. This condition is not covered under the limited warranty.

A properly sized thermal expansion tank should be installed on all closed systems to control the harmful effects of 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 41.

Thermal Expansion Tank Specifications

	Tank	Dimensions			Pipe
Model	Capacity	in Inches			Fitting
Number	In Gallons	Diameter	Len£1th		On Tank
153.331020	2	8 (203 mm)	12-3/4 (323	mm)	3/4" Male
153.331050	5	11 (279 mm)	14-3/4 (375	mm)	3/4" Male
		TABLE 6

	Expansion	Tank Sizing		Chart
	Inlet*	Water	Heater	Capacity		(Gallons)
	Water
	Pressure	30	40	50	66	82
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
		TABLE	7

*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.

		WATER HEATER		(3)
HOT	COLD/	COLD	WATER	PRESSURE
r....--w.-.	_- -...._	INLET	FITTING	VALVE WITH
				REDUCING

BY-PASS

(2)

	PRESSURE GAUGE		INLET COLD
		WATER		SHUT-OFF
I	RECOMMENDED	INSTALLATION
	I	MOUNTING)
	(VERTICAL
WATER HEATER
COLD WATER
INLET	FITTING	FLOOR, CEILING		JOIST, ETC.
HOT	COLD	STRAPPING
				(3)
				PRESSURE
				REDUCING
				VALVE WITH
		(1)		BY-PASS
		EXPANSION	/

		.,I	t
	PRESSURE	GAUGE--	INLET COLD
		WATER SHUT-OFF
	ALTERNATE	RECOMMENDED	INSTALLATION
I	I
	(HORIZONTAL MOUNTING)

FIGURE 41.

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 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.

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