31
cleanout. UN•LIME
®
and the booklet may be obtained through
your A. O. Smith dealer or distributor.
FIGURE 18
DELIMING SOLVENTS
A. O. Smith recommends 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, distributor or the
A. O. Smith Product Service Division. 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, replace
with A. O. Smith part no. 99038.
6. Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7. Replace outer jacket cover plate.
FIGURE 19
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, A. O. Smith 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
BTR(C)120-500 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 local A.O. Smith dealer, distributor or,
A.O. Smith Water Products Company:
Telephone: (800) 433-2545
Fax: (800) 433-2515
Website: www.hotwater.com
Prepare the Water Heater
To delime the water heater using the Flo-Jug method, first prepare
the heater for deliming as described in the "Why? When? and
How?" booklet, Form No. 4800. Then install the long plastic male
adapter fitting into the drain valve opening of the water heater.
Use teflon tape and hand tighten only. Do not overtighten.
Prepare the Up-N-Down Transfer Kit
The next step is the preparation on the Up-N-Down Transfer Kit,
if you have not already done so:
Summary of Contents for BTR 120
Page 25: ...25 FOR NATURAL GAS MODELS...
Page 26: ...26 FOR PROPANE GAS MODELS...
