DURAWATT® ELECTRIC WATER HEATER

Sediment / Lime Scale Removal

Waterborne impurities consist of the particles of soil and sand which settle out and form a layer of sediment on the bottom of the tank and adheres to heat exchange surfaces. The amount of calcium carbonate (lime) released from water is in direct proportion to water temperature and usage. The higher the water temperature or water usage, the more lime deposits are dropped out of the water. Lime accumulation not only reduces the life of the equipment but also reduces efficiency of the heater.

T & P Relief Valve

The pressure relief valve should be checked at regular intervals by manually opening the valve. The openings inside the valve may become restricted by a buildup of scale and become inoperative. If the valve does not open and close properly and does not blow off internal pressure when tested, it must be replaced. Shut down heater, relieve internal pressure and replace relief valve with a like kind or one meeting the requirements stated on the rating decal located adjacent to the relief valve mounting location.

Low Water Cut-Off

The standard low water control is electronic. Inspection should be made of the electrode on water heaters equipped with electronic low water devices.

Electrical Connections

Check all electrical connections approximately one to two weeks after initial start-up to assure tightness. Heating and cooling from operation can loosen connections. Visually inspect wire terminal points for any discoloration on a monthly basis. Discoloration is likely due to a loose connection at the point nearest discoloration. Check Contactors periodically and clean if necessary and repair or replace pitted points caused by foreign particles. Check Fuses periodically for continuity and replace if necessary with the same dual-element type.

REPLACING ELECTRIC ELEMENTS

Some electric heating elements installed in dished heads may be factory bent to allow clearance from adjacent elements. Replacement elements must be identical to the original equipment installed. The Bend Angle Stamp # is required for all replacement electric element requests. Important: Install the element facing away from the center of the head.

Typical Electric Element

FIGURE 4

BEND ANGLE

STAMP

25°

#1

18°

#2

FIGURE 4

Note: No stamp on element flange means that element is not bent.

PV500-6 09/07

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