Maintenance; General; Anode Inspection And Replacement; Flushing - State Water Heaters 100 Series Instruction Manual

General

Periodically the drain valve should be opened and the water allowed
to run until it flows clean. This will help to prevent sediment buildup
in the tank bottom.
Periodically check the temperature and pressure relief valve to
ensure that it is in operating condition. Lift the lever at the top of the
valve several times until the valve seats properly and operates freely.
Water heater maintenance includes periodic tank flushing and
cleaning, and removal of lime scale from the heating element.
The heater tank is equipped with an anode rod to aid in corrosion control.

anode InspectIon and replaceMent

Inspection of the sacrificial anode every 6 to 12 months allows you
to identify a spent anode and replace it. Replace the anode when
its diameter is 3/8" (1 cm) of an inch, or annually which ever is first.
Aggressive, very hot and softened water causes rapid consumption of
the anode requiring frequent inspections. Call the toll free number on
the back cover of this manual for information on obtaining replacement
anode rods.
taBle 8.
MaIntenance schedule
component operation
Tank

Flushing

Lime Scale
Elements
Removal
Tank flushing should be performed in accordance with the above
schedule. Tank sediment removal and element lime scale removal must
be performed as needed as determined by periodic inspection. Following
are the instructions for performing recommended maintenance.
flushInG
The water heater drain valve should be opened periodically to help
prevent sediment buildup on the tank bottom.
1. Turn off the electrical disconnect switch.
2. Attach hose to outlet opening of drain valve and direct end to drain.
• Open the drain valve by turning the hand wheel to the left
(counterclockwise). Allow water to flow until it runs clean.
• If water does not flow from opened drain valve, follow instructions
for sediment removal.
3. When finished flushing:
• Close heater drain valve and remove hose.
• Turn on electricity.

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 and cause their failure.

MaIntenance

Interval required
Periodically
Un•Lime delimer &
®
As needed
element gaskets, Part
For convenience, sediment removal and element lime scale removal
should be performed at the same time as follows.

lIMe scale reMoVal

Lime scale accumulations on the heating elements is a normal
condition, common to all immersion type elements. Factors which
affect the amounts 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. Characteristics of water supply.
Regardless of water treatment, examine elements regularly.
Lime scale accumulations may cause noises to occur during
operation.
It is recommended that a 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
UN•LIME® delimer. Do not use muriatic or hydrochloric acid base
deliming solutions to remove lime scale from the elements.
tHe ProceSS For lIMe ScAle reMovAl IS AS FollowS:
1. Turn off electrical disconnect switch.
2. Drain the heater following DRAINING instructions.
3. Open front panel.
4. Disconnect the element wiring. Try not to disturb the wiring
unnecessarily and reconnection will be easier.
5. Unscrew each element.
6. Remove the elements and gaskets from the openings.
• Use a twisting, pulling action to remove elements scaled beyond
the size of the tank openings.
• Brush loose scale from elements.
7. Lime scale removal:
• Place limed ends of heating elements into UN•LIME delimer and
allow scale to dissolve. Do not permit delimer or water to contact
heating element electrical terminals.
• Silicates, sulfates and aluminates must be removed by scraping
or other mechanical means. Lime scale dissolvents willnot remove
these types of scale occasionally encountered.
Call the toll free phone number on the back cover of this Instruction
Manual to purchase UN-LIME and heating element gaskets.
otHer ScAle reMovAl:
1. Flush cleaned ends of elements with water when deliming or
cleaning is completed.
2. Remove sediment and scale from the tank bottom through access
provided by the element openings or drain valve opening.
• The cold water inlet valve and drain valve may be opened to aid
the cleanout process.
3. Clean remaining gasket material from tank and element flanges
Do not reuse original element gaskets.
4. Put new gaskets on elements and install into tank openings.
• Uniformly tighten element bolts. Torque to approximately 32
ft./lbs.
5. Attach element wires to connection points from which they were
removed.
6. Follow FILLING instructions to restore hot water service.
• Check for water leaks around elements and proper operation
when heater is filled.
• Close the front panel.
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