Troubleshooting Guide

Start Up Conditions

THERMAL EXPANSION

Water supply systems may, because of high line pressure, fre- quent cut-off,s, the effects of water hammer and otbets, 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 measuresaretaken, the devicescause the water sys- tem to be dosed. As water is heated, it expands (thermal expan- sion) and closed systems do not allow for the expansion of beat-

HOT

COLD

WATER HEATER

(3)

COlDW_,TIR

 

 

INLET Fn-rlNG

pRESSURE

 

 

 

REDUCING

 

 

 

VALVEWITH

ed 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 the water heater's temperature-pressure relief valve is reached, the valve will relieve the excess pressure. The tcmpcra- ture-preasure relief valve is not intended for the constant relief of thermal expansion. This is an unacceptable condition and must be corrected.

WATER

SHUTOFF

RECOMMENDEDINSTALLATION (VEETtCALMOUNTING)

It is recommendedthat any devices installedwhich could create

a dosed system have a by-pass and/or the system have an expan- sion tank to relieve the pressure built by thermal expansion in the water system. Expansion tanks are available for ordering through the Sears Service Center. Contact the iota[plumbing

inspector, water supplier, and/or the Sears Service Center for assistance in controlling these situations.

Thermal Expansion Tank Specifications

Model

Tank Capacity

Dimensions in Inches

Pipe Fitting

I

Number

In Gallons

Diameter

Length

On

Tank

i

153.331020

2

8 inches

12_ inches

_" Male

 

153.331050

5

11 inches

14_inches

_" Male

 

Expansion Tank Sizing

Chart

 

 

 

 

 

Inlet*

Water HeaterCapacity (Gallons)

 

 

Water

 

 

 

 

 

 

Expansion Pressure

30

40

50

66

82

 

Tank

40psi

2

2

2

5

5

 

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.

WATEI_HEATER

FLOOR,¢EIUNG

COLD WAI_'R

IOIS_, ETC.

INLET FIT'nNG

 

HOT

STRAPPING

0)

PRESSURE

 

REDUCING

INLET COLD

(i)

VALVE WITH

WATER

BY-FASS

SHUTOFF

EXPANSION

pRESSUk_E GAUGE

ALTERNATE RECOMI_IENDED

INSTALLATION

(HORIZONTAL MOUNTING)

STRANGE SOUNDS

Possiblenoises due to expansion and contraction of some metal parts during periods of heat-up and cool-down do not represent harmful or dangerousconditions.

Condensation causes sizzling and popping with the burner area

during heating and cooling periods and should be considered normal. See "Condensation" section.

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Kenmore 153.336751, 153.336251, 153.336312 Troubleshooting Guide, Start Up Conditions, Thermal Expansion, Strange Sounds

153.336151, 153.336851, 153.336351, 153.336251, 153.336812 specifications

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