Kenmore 153.330632, 153.330652, 153.33062, 153.330642 Start Up Conditions, Thermal Expansion

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. Contact a plumbing service agency or your retail supplier regarding the installation of a thermal expansion tank.

Table 1 : 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 2: Expansion Tank Sizing Chart

	Inlet*		Water Heater	Capacity	(Gallons)
	Water
	Pressure	30	40	50	66	82
Expansion
	40 psi	2	2	2	5	5
Tank
Capacity	50 psi	2	2	2	5	5
Needed	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.

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 WATER		PRESSURE
	COLD	FITTING	REDUCING
	INLET

VALVE WITH

BY-PASS

(2)

	PRESSURE	GAUGE	INLET COLD
			WATER	SHUT-OFF
	RECOMMEN	DED INSTALLATION
	(VERTICAL MOUNTING)
WATER HEATER
COLD WATER
INLET FITTING		FLOOR,	CEILING	JOIST, ETC.
HOT	COLD	STRAPPING

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

FIGURE 35.

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 after 15 minutes of burner operation, shut off water heater and make necessary air supply changes to correct.

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