Kenmore 153.335963 Troubleshooting Guide, Start Up Conditions, Thermal, Expansion, Gallons

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 flow preventers, etc._to control these types of _roblems. When these devices are not equipped with an internal y_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 WATERHEATER	(3)
	• COLDWATER	PRESSURE
	, INLETFITTING	REDUCING
		VALVEWITH
		BY-PASS
	(1)
	TANK

EXPANSION(_

PRESSUREGAUGE COL

WATER

SHUTOFF

RECOHMENDED INSTALLATION

(VERTICAL MOUNTING)

WATER HEATER	FLOOR, CEILING
COLD WATER	JOIST, ETC.
INLET FI'H'ING
HOT	STRAPPING

Thermal	Expansion	Tank Specifications
Model	Tank Capacity	! Dimensions		in Inches	[ Pipe	Fitting	]
Numbe r	, !nGall0ns_		D!ameter	I Length	On,	Tank	I
153:33!O20	2	.	8inches	12_inches;	_',Male
153.331050	5	i	11 inches	14_ inches	Y_'Male

Expansion Tank		Sizing	Chart
	Inlet*	Water Heater		Capacity	(Gallons)
	Water
Expansion	Pressure	30	40	50	66	82
	40psl	2	2	2	5	5
Tank
Capacity	50psi	2	2	2	5	5
Needed	60psi	2	2	5	5	5
	70psi,	12	2	5	5	5
	80psi	2	5	5	5	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 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.

O)

	PRESSURE
	REDUCING INLETCOLD
VALVEWITH		WATER
0)	BY-PASS	SHUTOFF
EXPANSION
	(2) !
PRESSUREGAUGE
ALTERNATE RECOMMENDED
INSTALLATION
(HORIZONTAL	HOUNTING)

STRANGE SOUNDS

Possible noises due to expansion and contraction of some metal parts during periods of heat-upand 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

normal. See "Condensation" section.

31