Troubleshooting Guide

Start Up Conditions

THERMAL EXPANSION

Water supply systems may, because of such events as high line pressure, frequent cut-offs, the effects of water hammer among others, have installed devices such as pressure reducing valves,

check valves, back flowpreventers, 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 closed. As water is heated, it expands (ther- mal expansion) and closed systems do not allow for the expan- sion of heated 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 temperature-pressure relief valve is not intended for the constant relief of thermal

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

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.

HOT

COLA2 WATERHEATER

(3)

 

COLDWATER

PRESSURE

 

INLET FITTING

REDUCING

 

 

VALVEWITH

 

 

BY-PASS

 

EXPANSION

 

 

TANK(I)

1

(2)

PRESSURE GAUGE

WATER

SHUTOFF

RECOMMENDED INSTALLATION

(VERTICAL MOUNTING)

 

WATER HEATER

FLOOR, CEUNG

 

COLD WATER

jols'_ETC, .

 

INLET FITrlNG

 

HOT

COLD

STRAPPING

 

 

Thermal Expansion Tank Specifications

Model

Tank

Capacity

Dimensions

in Inches

Pipe

Fitting

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

Heater

Capacity

(Gallons)

 

 

]Water

 

 

 

 

 

 

 

 

 

 

[Pressure

30 _

 

40

[

50

 

66_

 

82

Expansion

_si

_

 

2

:

2

_

 

 

 

Capacity

[ 50psi

2

__

 

 

 

 

5

 

fi

Tank

 

 

 

 

 

Needed

166psi

2

[2

 

,

5

 

5_

[_

 

 

70psi

_2-

 

 

I

5

 

5

i

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 me i,nlet water pressure is higher than 40 psi, the expansion tanks air pressure must be adjusted to match that pressure, but must not be higher than 80 psi.

(3)

 

PRESSURE

 

 

REDUCING INLETCOLD

 

VALVEWITH

WATER

11)

BY-PASS

SHUTOFF

EXPANSION

{zl

PRESSURE GAUGE

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 narmful or dangerous conditions•

21

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Kenmore 153.320893 HT, 153.320492 HT Troubleshooting Guide, Start Up Conditions, Thermal Expansion, Strange Sounds

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