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Troubleshooting guide, Start up conditions, Thermal expansion – Kenmore 153.31614 User Manual

Page 22: Thermal expansion tank specifications, Expansion tank sizing chart, Strange sounds

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Troubleshooting Guide

Start Up Conditions

THERMAL EXPANSION

Water supply systems may, because of such events as high line
pressure, frequent cut-offi, 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 closed. As water is heated, it expands (ther­
mal e^mansion) 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

CO

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

Number

Tank Capacity

In Gallons

Dimensions in Inches

Pipe Fitting

On Tank

Diameter

Length

153.331020

2

8 inches

12/^ inches

’// Male

153.331050

5

11 inches

14fj inches

“//' Male

Expansion Tank Sizing Chart

Expansion

Tank

Capacity

Needed

Inlet*
Water

Pressure

Water Heater Capacity (Gallons)

30

40

50

66

82

40psi

2

2

2

5

5

50psi

2

2

2

5

5

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 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
COU> WATER

INLET FITTING

FLOOR, CEILING

JOIST, ETC.

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.

22

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