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Lime accumulation not only reduces the life of 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 cleanouts 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 27.

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 9005416105, 1 gallon, packed 4 gallons

per case or Part number 9005417105, 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.

To clean heater through cleanout opening, proceed as

follows:
3.  Drain heater.
4.  Remove outer cover plate from lower side of heater jacket.
5.  Remove six (6) hex head screws securing tank cleanout plate

and remove plate.

6. Remove lime, scale, or sediment using care not to damage

the glass lining.

7. Inspect cleanout plate gasket, if new gasket is required,

replace with part no. 9004099215.

8. Install cleanout plate. Be sure to draw plate up tight by

tightening screws securely.

9. Replace outer jacket cover plate.

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.