30
PERIODIC REMOVAL OF LIME DEPOSITS FROM
TANK TYPE COMMERCIAL WATER HEATERS
The amount of calcium carbonate (lime) released from
water is in direct proportion to water temperature and
)
. The higher the water
temperature or water usage, the more lime deposits are
dropped out of the water. This is the lime scale which
forms in pipes, heaters and on cooking utensils.
Lime accumulation not only reduces the life of the
equipment but also reduces efficiency of the heater and
increases fuel consumption.
The usage of water softening equipment greatly reduces
the hardness of the water. However, this equipment does
not always remove all of the hardness (lime). For this
reason it is recommended that a regular schedule for
deliming be maintained.
The time between cleaning will vary from weeks to
months depending upon water conditions and usage.
The depth of lime buildup should be measured
periodically. Heaters equipped with cleanout openings
will have about 2” of lime buildup when the level of lime
has reached the bottom of the cleanout opening. A
schedule for deliming should then be set up,based on the
amount of time it would take for a 1” buildup of lime. It is
recommended that the water heater initially be inspected
after 6 months.
EXAMPLE 1:
Initial inspection after 6 months shows 1/2” of lime
accumulation. Therefore, the heater should be delimed
once a year.
EXAMPLE 2:
Initial inspection after 6 months shows 2” of lime
accumulation.
Therefore, the heater should be delimed every 3 months.
FIGURE 25. LIME BUILD-UP BY TEMPERATURE AND
USAGE
DELIMING SOLVENTS
UN•LIME is recommended for deliming. UN•LIME is a
patented food grade acid which is safe to handle and
does not create the harmful fumes which are associated
with other products.
UN•LIME may be obtained from your dealer, distributor
or water heater manufacturer. Order Part Number
100110459, 1 gallon, packed 4 gallons per case or Part
Number 100110460, 5-gallon container.
NOTE:
Un•Lime is not available for use in Canada.
Hydrochloric base acids are not recommended for use on
glass lined tanks.
Observe handling instructions on label of product being
used.
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable
the unit to operate at its designed efficiency:
1.
Once a month the heater should be flushed. Open
the drain valve and allow two gallons of water to drain
from the heater. Inlet water valve should remain open
to maintain pressure in tank.
2.
A cleanout opening is provided for periodic cleaning
of the tank. Gas must be shut off and heater drained
before opening cleanout.
3.
To clean heater through cleanout opening, proceed as
follows:
a.
Drain heater.
b.
Remove outer cover plate from lower side of heater
jacket.
Summary of Contents for BT-100-LP
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