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

COLD WATER

HEATER

(3)

 

COLD

WATER

PRESSURE

 

INLET

FITTING

REDUCING

 

 

 

VALVE WITH

 

 

 

BY-PASS

(i)

EXPANSION

TANK

 

(z)

 

PRESSUREGAUGE

 

WATER

 

SHUTOFF

 

RECOMMENDED INSTALLATION

i_,*ii=====,_1

(VERTICAL MOUNTING)

 

WATER HEATER

FLOOR, CEILING

 

COLD WATER

JOIST, ETC.

 

INLET FITTING

 

HOT

COLD

STRAPPING

Thermal Expansion Tank Specifications

Model

i Tank CaDac ty

Dimension,s in Inches

Pipe Fitting

[ Number

_

In Gallons

!Diameter"

Length

On Tank

1153.3310207

2

• 8inches

712_incbes

_;'Male

1153.33i0505 i Hiochesil<inches Ma,e

Expansion Tank

Sizing

Chart

 

 

 

 

i Inlet*

 

Water Heater

Capacity

(Gallons)

 

I

 

 

Water

 

 

 

 

 

 

 

Expansion

Pressure

l

30

i

40 '

50

66

 

40psi

 

2

 

2

2

5

 

Tank

 

i

 

Capacity

0psi

[

2

iT

 

5

1

Needed

 

 

 

 

 

 

 

 

 

 

76ps_

_

2

!

2

5

5

/ 5

 

80psi

i

2

 

5

5 :

5

5

*Highest recorded inlet water pressure m a 24 hour period or regulated water pressure.

NOTE: Expansion tanks are we-chargedwith a 40 psi air

charge. If the inlet water pressure is hi_her 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

INLET COLD

 

VALVEWITH

WATER

(1)

BY-PASS

SHUTOFF

EXPANSION

 

 

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.

Condensation causes sizzling and popping with the burner area

during heating and cooling periods and should be considered

normah See "Condensation" section.

28

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Kenmore 153.335862, 153.335942, 153.335845, 153.335962 Troubleshooting Guide, Start Up Conditions, Thermal Expansion

153.335862, 153.335942, 153.335916, 153.335962, 153.335845 specifications

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