Kenmore 153.331492 User Manual download pdf (Page 33)

TROUBLESHOOTING GUIDE

Start Up Conditions

Thermal Expansion

CAUTION

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 will grow. As the volume of water

grows, there will 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.

TABLE 4

Thermal Expansion Tank Specifications

Model

Number

Tank

Capacity

In Gallons

Dimensions

in Inches

Pipe

Fitting

On Tank

Diameter Length

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

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.

HOT COLD,

WATER HEATER

COLD WATER

INLET FITTING

(3)

PRESSURE

REDUCING

VALVE WITH

BY-PASS

(2) /

PRESSURE GAUGE INLET COLD

WATER SHUT-OFF

RECOMMENDED INSTALLATION

” (VERTICAL MOUNTING)

WATER HEATER

COLD WATER

FIGURE 41.

Strange Sounds

TABLE 5

Expansion Tank Sizing Chart

Expansion

Tank

Capacity

Needed

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

OOpsi 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.

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

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