Kenmore 153.320893 HT Troubleshooting Guide, Start Up Conditions, Expansion Tank, Sizing, Chart

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	COLA2 WATERHEATER	(3)
	• COLDWATER	PRESSURE
	INLET FITTING	REDUCING
		VALVEWITH
		BY-PASS
	EXPANSION
	TANK(I)	1

(2)

PRESSURE GAUGE

WATER

SHUTOFF

RECOMMENDED INSTALLATION

(VERTICAL MOUNTING)

	WATER HEATER	FLOOR, CEUNG
	COLD WATER	jols'_ETC, .
	INLET FITrlNG
HOT	COLD	STRAPPING

Thermal Expansion Tank Specifications

Model	Tank	Capacity	Dimensions	in Inches		Pipe	Fitting
Number	In	Gallons	Diameter	Length		On	Tank
	i
153•331020		2
			8 inches	12_	inches	_"	Male
153.331050		5	11 inches	14_	inches	_"	Male

Expansion Tank		Sizing	Chart
	Inlet*	Water		Heater		Capacity		(Gallons)
	]Water
	[Pressure	30 _		40	[	50		66_		82
Expansion	_si	_		2	:	2	_
Capacity	[ 50psi	2	__					5		fi
Tank
Needed	166psi	2	[2		,	5		5_	[_
	70psi	_2-			I	5		5	i	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 me i,nlet 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.

(3)

	PRESSURE
	REDUCING INLETCOLD
	VALVEWITH	WATER
11)	BY-PASS	SHUTOFF

EXPANSION

{zl

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 narmful or dangerous conditions•

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