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 _mong 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 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 reacfied, the

valve will relieve the excesspressure. 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 dosed system have a by-pass and/or the system have an expan-

sion tank to relieve the pre_ure built by thermal expansion.

Thermal expansion tanks ar'e 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

COLD

WATERHEATER

 

COLDWATER

PRESSURE

 

 

 

 

, INLETFII-nNG

 

 

REDUCING

 

 

 

 

 

 

VALVEWITH

 

 

 

BY-PASS

(t)

EXPANSION

TANK

(z)

PRESSUREGAUGE

WATER

SHUTOFF

RECOMMENDED INSTALLATION

(VERTICAL MOUNTING)

WATER HEATER

FLOOR,CEIUNG

COLD WATER

lOb-n;ETC.

INLET FITTING

 

 

STRAPPING

Thermal Expansion Tank Specifications

Model

Tank Capacity

Dimensions

in Inches

Pipe Fitting

Number

In Gallons

Diameter

Length

On Tank

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

 

 

 

 

 

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 me 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.

0)

PRESSURE

REDUCING INLET COLD

VALVEWITH WATER

(I)BY-PASS SHUTOFF EXPANSION

(z)

PRESSUREGAUGE

ALTERN.A.TERECOMMENDED

INSTALLATION

(NC?PJZONTALMOUNTING)

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.

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 153.337363, 153.337863, 153.337963, 153.337962 Troubleshooting Guide, Start Up Conditions, Thermal Expansion

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