15
PREVENTIVE MAINTENANCE
RECOMMENDED PROCEDURE FOR 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 usage, see chart. 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.
UN•LIME
®
solvent may be obtained through your
Water Heater dealer or distributor. (NOTE: UN•LIME
®
is not available
in Canada).
DELIMING SOLVENTS
Water Heater manufacturer's recommend the use of UN•LIME 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 or distributor. Order
Part No. 4763 (1 gal), packed 4 gallons per case or part no. 4813
(5 gallon container).
Hydrochloric base acids are not recommended for use on glass-
lined tanks.
CAUTION
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.
To clean heater through cleanout opening, proceed as follows:
1.
Drain heater.
2.
Remove outer cover plate from lower side of heater jacket.
3.
Remove six (6) hex head screws securing tank cleanout plate
and remove plate.
4.
Remove lime, scale, or sediment using care not to damage
the glass lining.
5.
Inspect cleanout plate gasket, if new gasket is required, see
replacement parts list for item number.
6.
Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7.
Replace outer jacket cover plate.
FIGURE 9.
In some water areas the sediment might not be removed by this
method and may result in the water heater making rumbling or
boiling noises. To dissolve and remove these more stubborn
mineral deposits, UN•LIME Professional Delimer should be used.
DELIMING USING FLO-JUG METHOD
UN•LIME in the 5 gallon size is recommended for deliming of the
***-75 and 100 models. UN•LIME with the necessary hoses and
fittings to delime your heater is also available as a kit: Up-N-Down
Transfer Kit. Contact your Water Heater dealer or distributor.
