Start Up Conditions, Operationa Conditions

Start Up Conditions

TNERMAL EXPANSmON

Property Damage Hazard

° Avoid water heater damage.

o Install thermal expansion tank or device if necessary. o Contact qualified installer or service agency.

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 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 close& As

water is heated, it expands (thermal expansion) and closed systems do not allow for the expansion 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 wil! relieve the excess pressure. The

temperatureopressure relief valve is not intended for the

constant relief 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

expansion tank to relieve the pressure built by thermal

expansion in the water system. 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.

Therma! Expansion				Tank	Specifications
		Tank		Dimensions		Pipe
						Pipe
Model		Capacity		in inches		Fitting
Number	in	Gallons	_m		Length	On Tank
	in	Gallons	_m		Length
153.331020		2	8 (203	ram)	12-3/4 (323 ram)	3/4" Mate
153.331050		5	11 (279	mm)	14-3/4 (375 mm)	3/4" Mate
		5	11 (279	mm)	14-3/4 (375 mm)

	Expansion	Tank	Sizing	Chart
	h[et*	Water	Heater	Capacity		(Gallons)
	Water		E
	Pressure		E
	Pressure	30	40	50	66	82
Expansion	40psi	2	2	2	5	5
Tank	50psi	2	2	2	5	5
Capacity	60psi	2	2	5	5	5
Needed	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 preocharged with a 40 psi air

charge. Bfthe 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	(3)
COLD	WATER	PRESSURE
0NLET FITTING		REDUCING

VALVE WITH

BY-PASS

{2)

PRESSURE GAUGE		ruNLET COLD
		WATER	SHUT-OFF
RECOMMENDED	mNSTALLATION
IVERTICAL	MOUNTING)
WATER HEATER
COLD WATER
INLET FITTING	FLOOR,	CEILING	JOIST, ETC.
	FLOOR,	CEILING	JOIST, ETC.

PRESSURE

REDUCING

_ STRAPPING(3)

_%"(1) VALVEWITHBY=PASS

EXPANSmON /

TANK

!2)	/	f
PRESSUREGAUGE		#1LETCOLD

WATER SHUT-OFF

ALTERNATE RECOMMENDED INSTALLATION

{HORIZONTAL MOUNTING)

FIGURE 43.

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.

Operationa_ Conditions

SMELLY WATER

In each glass-lined water heater there is installed one anode

rod (see parts section) for corrosion protection of the tank.

Certain water conditions will cause a reaction between this

rod and the water. The most common complaint associated with the anode rod is one of a "rotten egg smell'L This odor is derived from hydrogen sulfide gas dissolved in the wateE The smell is the result of four factors which must all be present for the odor to develop:

A A concentration of sulfate in the supply water.

B. Little or no dissolved oxygen in the water.

C. A sulfate reducing bacteria within the water heater. (This harmless bacteria is nomtoxic to humans.)