Temperature-Pressure Relief Valve Operation
The
When checking the
FIGURE 2B.
If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions in the Operation section of this manual, and replace the
If the
Component | Operation | Interval | Required |
| Flushing | Monthly |
|
Tank | Sediment | As Needed |
|
| Removal |
|
|
| Lime Scale | As Needed | |
Elements | Removal |
| and element |
|
|
| gaskets |
table 6. maintenance schedule.
FLUSHING
1.Turn off the electrical disconnect switch.
2.Open the drain valve. Allow water to flow until it runs clean.
3.Close the drain valve when finished flushing.
4.Turn on the electrical disconnect switch.
SEDIMENT REMOVAL
Water borne impurities consist of fine particles of soil and sand which settle out and form a layer of sediment on the bottom of the tank. In time, if not removed, the level of sediment might reach the heating elements causing premature heating element failure.
For convenience, sediment removal and element lime scale removal should be performed at the same time as follows:
WATER AND LIME SCALE REMOVAL
Water and lime scale accumulations on the heating elements is a normal condition, common to all immersion type elements. Factors which affect the amount of this formation are:
1.Amount of hot water used. As the volume of water heated increases, more scale results.
2.Water temperature. As the temperature of the water is increased, more scale is deposited on the elements.
3.Mineral level characteristics of the water supply. Regardless of water treatment, the elements should be examined regularly.
STRANGE SOUNDS
Water scale accumulations may cause noises to occur during operation.
It is recommended that a lower heating element be removed periodically for examination. If it is scaled, all of the elements should be removed and cleaned. If the tank bottom has an accumulation of sediment, it should be cleaned.
Lime scale should be removed by dissolving the accumulation in
All models: do not pour delimer into tank.
1.Turn off electrical disconnect switch.
2.Drain heater following DRAINING instructions, see Page 14.
3.Disconnect the wires attached to the elements terminals. Try not to disturb the wiring unnecessarily and reconnection will be easier.
4.Remove the bolts from each element and remove the elements from the openings.
Use a twisting, pulling action to remove elements scaled beyond the size of the tank openings.
Brush loose scale from elements.
Silicates, sulfates and aluminates must be removed by scraping or other mechanical means. Lime scale dissolvents will not remove these types of scale which are occasionally encountered.
5.Lime scale removal:
Place limed ends of heating elements into
6.Flush cleaned ends of elements with water when deliming or cleaning is completed.
7.Remove sediment and scale from the tank bottom through the access provided by the element opening or tank cleanout, if furnished.
The cold water inlet valve and drain valve may be opened to air the cleanout process.
8.Clean remaining gasket material from tank and element flanges.
Do not reuse original element gasket.
9.Replace elements as follows:
Put a new gasket on each element.
Install into tank opening from which element was removed. Uniformly tighten element bolts. Torque to approximately 32 ft/lbs.
10.Attach wires to element terminals from which they were
removed.
11.Follow FILLING instructions in the Operation section of this manual to restore hot water service, see Page 14.
Check for water leaks around elements and proper operation when heater is filled and during operation.
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