Kenmore 153.31242 manual Start Up Conditions, Operational Conditions, Expansion Tank Sizing Chart

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.

Table 2: Thermal Expansion Tank Specifications

Model	Tank		Dimensions				Pipe
Number			in	Inches			Fitting
		Diameter		Length			On Tank
153.331020	2	8 (203	mm)	12-3/4"	(323	mm)	3/4"Male
153.331050	5	11 (279	rara)	14-3/4"	(375	ram)	3/4"Male
Table 3: Expansion Tank Sizing Chart
		Inlet*		Water Heater Capacity
		Water			(Gallon)
		Pressure		30	40	50	66	82
Expansion		40psi		2	2	2	5	5
Tank
Capacity		50psi		2	2	2	5	5
Needed		60psi		2	2	5	5	5
		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 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.

HOTCOLD

COLD WATERPRESSURE

INLET FITTINGREDUCING

VALVE WITH

BY-PASS

				INLET	COLD
				WATER
				SHUTOFF
6INCH		RECOMMENDED	INSTALLATION
MAXIMUM AIR GAPt__
		(VERTICAL	MOUNTING)
WATER	HEATER	FLOOR,	CEILING
COLD WATER		JOIST, ETC,
INLET	FITTING
HOT	COLD	STRAPPING
		PRESSURE
		REDUCING		INLET	COLD
		VALVEWlTH		WATER
		BYPASS		SHUTOFF
		PRESSURE	GAUGE

6INCH

ALTERNATE RECOMMENDED

INSTALLATION

(HORIZONTAL MOUNTING)

FIGURE 43.

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.

Operational Conditions

SMELLY WATER

In each glass-lined water heater there is installed one anode

rod (see parts section) for corrosion protection of the tank. Certain water conditions wilt cause a reaction between this rod

and the water. The most common complaint associated with the anode rod is one of a "rotten egg smell." This odor is derived from hydrogen sulfide gas dissolved in the water. The smell is the result of four factors which must all be present for the odor to develop:

A. A concentration of sulfate in the supply water.

B. Little or no dissolved oxygen in the water.

C. A sulfate reducing bacteria within the water heater. (This harmless bacteria is non-toxic to humans.)

D. An excess of active hydrogen in the tank. This is caused by corrosion protective action of the anode.

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