Troubleshooting Guide, Start Up Conditions

Troubleshooting Guide

Start Up Conditions

THERMAL EXPANSION

Water supply systems may, because of such events as high line pressure, frequent cut-off's, 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 ex_,ansion) 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 createa 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 assistancein controlling these situations.

HOT	COLD WATER HEATER	O)
	• COLD WATER	PRESSURE
	INLET FI'I-NNG	REDUCING
		VALVEWITH
		BY.PASS

WATER

SHUTOFF

RECOMMENDED INSTALLATION

(VERTICAL MOUNTING)

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

Thermal Expansion Tank Specifications

ModelTankCapacityOimensionsinPipeFittingnches0)

Number	InGallons	Diameter	Length	On Tank		PRESSURE
						REDUCING	INLET COLD

153.331020	2	8inches	12_inches	_"Male	(1)	VALVE WITH	WATER
153.331050	5	11 inches	14_inches	_"Male		BY-PASS	SHUTOFF
					EXPANSION

Expansion Tank		Sizing Chart
	Inlet*	Water	Heater	Capacity	(Gallons)
	Water
Expansion	Pressure	30	40	50	66	82
Expansion		30	40	50	66	82
Tank	i 40psi	2	2	2	5	5
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.

PRESSURE GAUGE

ALTERNATE RECOMMENDED

INSTALLATION

(HORIZONTALMOUNTING)

STRANGE SOUNDS

Possible noises due to expansion and contraction of some metal parts during periods of heat-up and cool-down do not represent harmfial or dangerous conditions•