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SEDIMENT 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.
For convenience, sediment removal and lime scale removal should
be performed at the same time.
LIME SCALE REMOVAL
When water is heated dissolved minerals in the water such as calcium
and magnesium carbonate (lime scale) become less soluble. As the
water temperature rises these minerals will precipitate or "fall out"
of solution.
The amount of lime scale 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.
Water hardness also affects lime scale accumulation. With the
temperature and usage being the same, hard water will release more
lime scale than softer water.
Lime scale reduces heating efficiency as it accumulates inside a water
heater. Heating transfer surfaces become coated with lime scale
deposits which increases fuel costs to operate the water heater. Lime
scale deposits can also cause rumbling and pounding noises as air
molecules trapped in the lime scale escape when heated. Lime scale
accumulation also reduces the life span of water heaters. For these
reasons, a regular schedule for deliming should be set up.
The depth of lime accumulation in the bottom of the water heater
should be measured periodically. Inspect by removing the cleanout
cover once every 6 months at first. Deliming maintenance should then
be performed based on the time it takes for 1 inch (2.5 cm) of lime to
accumulate in the bottom of the water heater.
Sediment and lime scale removal may be accomplished manually
through the cleanout opening furnished on the water heater, see
.
Figure 64
TANK
CLEANOUT
CLEANOUT
OPENING
GASKET
CLEANOUT
COVER
Figure 64. Cleanout Access
MANUAL LIME SCALE REMOVAL
Note: Contact your local distributor or call the parts
department phone number on the back cover of this
manual to order a new cleanout gasket. Have the new
gasket available before removing the cleanout cover.
The cleanout opening is shown in
manually through the cleanout opening proceed as follows:
1. Turn the Enable/Disable switch located on the front of the heater
to the Disabled position.
2. Turn off the electrical supply to the water heater.
3. The water heater must be drained, see
(page 63), follow the instructions on how to drain the water
heater.
4. Remove outer cleanout access panel from lower side of the
water heater jacket.
CLEANOUT
ACCESS PANEL
. To remove lime scale
Figure 64
Draining And Flushing
5. Remove the cleanout cover from cleanout opening.
6. Remove lime, scale and/or sediment using care not to damage
the glass-lining.
7. Install a new cleanout gasket if required.
8. Reinstall the cleanout cover. Be sure to draw plate up tight by
tightening screws securely.
9. Close the water heater drain valve.
10. Fill the water heater - see
11. Turn on the electrical supply to place the water heater back in
operation. See
Initial Start Up
12. Allow the water heater to complete several heating cycles to
ensure it is operating properly.
13. Check for water leakage.
14. Reinstall the cleanout access panel.
CHEMICAL LIME SCALE REMOVAL
To dissolve and remove more stubborn lime scale deposits, UN-
LIME
®
Professional Delimer should be used.
UN-LIME
Professional Delimer is an easy to handle patented
®
food grade acid formulated specifically for lime scale removal from
all types of water using equipment. Hydrochloric base acids must
not be used to delime the water heaters covered in this manual.
Follow the instructions on the UN-LIME
heater.
Note: Call the parts department phone number on the back
cover of this manual to order UN-LIME
Delimer. It is available by the case (four one-gallon
containers) or in single five-gallon containers.
POWERED ANODE RODS
To insure a long, trouble-free operating life, the water heaters
covered in this manual are factory equipped with a powered anode
system. The anode rod(s) are of a permanent design and do not
need replacing unless damaged. Inspection and cleaning should
be performed once a year.
Note: Follow the instructions to drain the water heater
storage tank in
Draining the Water Heater Storage Tank
(page 63) first. Remove the powered anodes from
the water heater by loosening the 3/4" NPT bushing
that forms the top of the anodes. Do not disassemble
the retaining nut and wire terminal from the top while
installed in the water heater, the anode's electrode
may fall inside the tank. Remove the entire anode
rod from the water heater prior to inspection. Clean
the anode rods with a soft cloth and reinstall. Follow
the instructions for filling the water heater in
(page 53) when finished.
Water Heater
DRAIN VALVE AND ACCESS PANELS
The water heaters covered in this manual are equipped with a
drain valve, see
Features and Components
The water heaters covered in this manual are also equipped with
a cleanout opening for sediment and lime scale removal. See
(page 64).
Figure 64
TEMPERATURE-PRESSURE RELIEF VALVE TEST
It is recommended that the Temperature-Pressure Relief Valve
should be checked to ensure that it is in operating condition every
6 months.
When checking the Temperature-Pressure Relief Valve operation,
make sure that (1) no one is in front of or around the outlet of the
Temperature-Pressure Relief Valve discharge line, and (2) that
the water discharge will not cause any property damage, as the
water may be extremely hot. Use care when operating valve as
the valve may be hot.
64
(page 53).
Filling The Water Heater
(page 53).
to delime the water
®
Professional
®
Filling The
(page 8) for location.
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