Kenmore 153.33296 Troubleshooting Guide, Start Up Conditions, Thermal Expansion, Strange Sounds

Troubleshooting Guide

Start Up Conditions

THERMAL EXPANSION

Water supply systems may, because of such events as high line pressure, frequent cut-off}, 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 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
		VALVEWITH
		BY-PASS

(0

EXPANSION

TANK

(2)

PRESSUREGAUGE INLET COLD

WATER

SHUTOFF

RECOMMENDED INSTALLATION

(VERTICAL MOUNTING)

	WATER HEATER	FLOOR, CEILING
	COLD WATER
		JOIST, ETC.
	INLET FITTING
HOT	COLD	STRAPPING

Thermal Expansion

Model Tank Capacity

Number In G£1ons

153.331020 2

153.331050 5

Tank Specifications

Dimensions in Inches Pipe Fitting

Diameter Length On "lhnk 8 inches 12_ inches Y4"Male 11 inches 14_ inches Y4"Male

(3)

	PRESSURE	INLET
	REDUCING	COLD
	VALVEWITH	WATER
(0	BY-PASS	SHUTOFF
EXPANSION
TANK

Expansion	Tank	Sizing	Chart
	Inlet*	Water	Heater Capacity		(Gallons)
	Water
Expansion	Pressure	3O	40	50	66	82
		2	2	2	5	5
"Ihnk	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 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.

(2)_

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 heati,llg and coolin,g, periods and should be considered normal. See Condensation section.

32