Troubleshooting Guide

Start Up Conditions

THERHAL EXPANSION

"_Tater supply systems may, because of high line pressure, fre-

quent cut-offs, the effects of water hammer and 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 sys-

tem to be closed. As water is heated, it expands (thermal expan- sion) and closed systems do not allow for the expansion of heat- ed 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 tempera- ture-pressure relief valve is not intended for the constant rdief of thermal expansion. This is an unacceptable condition and must be corrected.

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 in

the water system. Expansion tanks are available for ordering through the Sears Service Center. Contact the local plumbing

inspector, water supplier, and/or the Sears Service Center for assistance in controlling these situations.

HOT

COLD

WATER HEATER

0)

COLD WATER

 

 

PRESSURE

 

 

INLET FITTING

 

 

REDUCING

 

 

 

 

 

 

VALVEWITH

 

 

 

BY-PASS

 

 

0)

 

 

 

EXPANSION

 

 

 

TANK

 

 

 

(_

 

 

 

PRESSUREGAUGE

WATER

 

 

 

 

 

 

SHUTOFF

RECOHMENDED INSTALLATION

(VERTICAL MOUNTING)

WATER HEATER

FLOOR, CEILING

COLD WATER

JOIST, ETC.

INLET FITTING

 

 

STRAPPING

Thermal Expansion Tank Specifications

Model ]'Iknk Capacity Dimensions in Inches Pipe Fitting

O)

PRESSURE

REDUCING

INLET COL

VALVE WITH

WATER

Number [ In Gallons

Diameter Length On Tank

O)

BY-PASS

SHUTOFF

EXPANSION

 

 

 

 

 

 

8 inches

12_ inches

 

_" Male

 

 

 

 

1! inches

i14_ inches I

g4 Male

 

 

 

 

 

Expansion Tank

Sizing

Chart

 

 

 

 

 

i

 

 

 

 

 

 

 

 

 

] Inlet*

i

 

Water Heater

Capacity

(Gallons)

 

Water

I

 

 

 

 

 

 

 

Expansion

Pressure

:

30

 

40

[-

52

66

7"-_-

 

 

2

 

2

 

2

5

5

Tank

i40p si

 

 

I

 

2

i

2

2

5

! 5

Capacity

 

 

 

Needed

6_ps!.

 

 

 

 

 

5

5

5

 

LT0.._P..S}

2

_[ 2

 

 

5

5

 

 

55

5

5

 

80psi

 

2

 

5

 

 

 

 

 

 

 

 

 

 

*Highest recorded inlet water pressure m 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 tanks air pressure must be adjusted to match that pressure, but must not be higher than 80 psi.

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 popping with the burner area

during heat!ng and coolin,g periods and shouId be considered normal. See Condensation section.

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Sears 153.33645, T53, 33631I, 336350 30 GAL, 153.33685, 153.33675, 153.33625, 153.336411 Start Up Conditions, Strange Sounds

153.33651I, 33631I, 153.33655, 153.3368I1, 153.33625 specifications

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