Troubleshooting Guide

Start Up Conditions

THERMAL EXPANSION

Water supply systems may, because of such events as high line pressure, frequent cut-of_, the effects of water hammer among others, 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 measures are taken, the devices cause the water system to be dosed. As water is heated, it expands (ther-

mal expansion) and dosed systems do not allow for the expan- sion of heated water.

HOT

COLD

WATER HEATER

 

- COLD WATER

(3)

 

 

 

PRESSURE

 

 

, INLET FITTING

REDUCING

 

 

 

VALVEWITH

 

 

 

BY-PASS

(0

EXPANSION

TANK

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 temperature-pressure relief valve is not intended for the constant relief of thermal

expansion. This is an unacceptable condition and must be cor- rected.

(z)

PRESSUREGAUGE

WATER

SHUTOFF

RECOMMENDED INSTALLATION

(VERTICAL MOUNTING)

It is recommended that any devices installed which could create a closed system have a by-pass and/or the system have an expan- sion tank to relieve the pressure built by 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.

Thermal Expansion Tank Specifications

Model

_hnk Capacity

Dimensions

in Inches

Pipe Fitting

Number

In Gallons

Diameter

Length

On

"Ihnk

153.331020

2

 

8 inches

12Y4inches

Yi' Male

153.331050

5

 

11 inches

14Y4inches

Yi' Male

Expansion

Tank

Sizing Chart

 

 

 

 

Inlet*

 

Water Heater Capacity

(Gallons)

 

Water

 

 

 

 

 

Expansion

Pressure

27

30

40

50

66

40psi

2

2

2

2

5

"lank

Capacity

50psi

2

2

2

2

5

Needed

60psi

2

2

2

5

5

 

70psi

2

2

2

5

5

 

80psi

2

2

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

FLOOR, CEILING

COLD

WATER

JOIST, ETC.

INLET

FITTING

 

HOT

COLD

STRAPPING

(3)

PRESSURE

 

 

REDUCING

INLET COLD

 

VALVEWITH

WATER

 

(0

BY-PASS

SHUTOFF

 

EXPANSION

 

 

 

TANK

 

 

 

PRESSUREGAUGE

 

 

ALTERNATE RECOMMENDED

 

 

INSTALLATION

 

 

(HORIZONTAL

MOUNTING)

 

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.

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Kenmore 153.318131, 153.318031 owner manual Troubleshooting Guide, Start Up Conditions, Thermal Expansion, Strange Sounds

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