amount of the solution. If the material is vigorously dissolved by the solution, the UN•LIME® can be reused. If not, then UN•LIME® has been weakened and should be replaced.
8.When deliming has been completed, the heater should be flushed for 3 to 5 minutes with fresh water.
•Remove the deliming equipment, install the drain valve, open the cold water inlet line and allow water to flow through heater and out the drain valve. Don't forget to plug vent and cap opening in
9.When flushing is completed:
•Fill heater being certain to expel air from tank through a nearby hot water faucet.
•Replace relief valve, removed for deliming.
•Restore oil, water and electrical supply to heater.
•Check for water leakage.
10.
•Allow scale to separate from UN•LIME® and settle on bottom of
•Pour off UN•LIME® into plastic container and check for reuse.
•Rinse sediment from
•If UN•LIME® is reusable , pour back into
CIRCULATING PUMP
The water heater or water heating system may include a circulating pump. Where used, it may need to be lubricated once every four months with SAE No. 20
•Place 2 or 3 teaspoons in the bearing oil cup and 10 to 12 drops in the
motor oil cups.
SOOT REMOVAL
Soot must be removed
A TYPICAL HEATER FLUEWAY AND FLUE BAFFLE
FIGURE 19
1.Remove chimney connector and top cover of heater from heater. Clean out all soot deposits from connector and chimney opening. A wire brush is recommended for this operation.
2.Remove flue baffles by lifting from tank.
3.Using a wire brush, remove soot from flue passages in heater tank.
CAUTION: While cleaning tank flue passages, care must be taken that brush does not come in contact with the top of the combustion chamber as damage could occur to the combustion chamber lining. Do not allow the brush to enter the heater flue more than noted in fig. 19.
4.Remove oil burner assembly and using a vacuum cleaner, remove all loose soot from combustion chamber area. Avoid contact with combustion chamber as it can be damaged quite easily.
• If flange gasket is damaged, replace with A.O. Smith Part No. 24165
5.Upon completion of cleaning, reassemble the heater. (It may be necessary to apply new sealer tape to the top cover to ensure proper venting. New sealer tape can be ordered from A.O. Smith Water Products Company).
6.Return the heater to operation by following the
VENT SYSTEM
Examine the vent system every six months for obstructions and/or deterioration of vent piping. Remove any soot or obstructions and replace damaged vent piping.
14