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 flow preventers, etc...to control these types of

_roblems. When these devices are not equipped with an internal y-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 excesspressure. The temperature-pressure

relief valve is not intendedfor 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

COLD WATERHEATER

(3)

 

:=I1£ COLDWATER

PRESSURE

 

bINLET FITTING

REDUCING

 

 

 

 

VALVEWITH

 

 

BY-PASS

"PRESSU(R gGAUG

WATER

SHUTOFF

 

RECOMMENDED INSTALLATION

_,m====,m==_

(VERTICAL MOUNTING)

WATER HEATER

FLOOR, CEILING

COLD WATER

JOIST, ETC,

INLET FITTING

 

HOT

STRAPPING

Thermal Expansion Tank Specifications

Model

Tank

C_lpacity

Dimensions

in Inches

i Pipe

Fitting

Number

In

Gallons

D ameter

. Length

On

Tank

153.331020

 

2

8 inches

127, inches

Vi'

Male

i531331050

5

 

llinches

14_inches

 

W'Male

 

 

 

 

 

 

 

4

Expansion

Tank

Sizing

Chart

 

 

 

 

Inlet*

Water

Heater Capacity

(Gallons)

 

Water

 

 

 

 

 

 

Expansion

Pressure

30

!

40

50

66

82

2

 

2

2

5

5

Tank

40psi

 

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 waterpressure.

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.

O)

 

PRESSURE

 

 

REDUCING INLETCOLD

 

VALVEWITH

WATER

(i)

BY-PASS

SHUTOFF

EXPANSION

(21

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 harmful or dangerous conditions.

Condensation causes sizzling and po 3ping with the burner area

during heating and cooling periods and should be considered normal. See "(]ondensation" section.

28

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Kenmore 153.335862, L53.335816, 153.335942 Troubleshooting Guide, Start Up Conditions, Thermal Expansion, Strange Sounds

153.335862, 153.335942, 153.335916, 153.335962, 153.335845 specifications

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