12
SEDIMENT REMOVAL
Water borne impurities consist of fine particles of soil and sand which
settle out and form a layer of sediment on the bottom of the tank.
For convenience, sediment removal and lime scale removal should be
performed at the same time.
LIME SCALE REMOVAL
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.
WATER USAGE IN GALLONS PER DAY POUNDS OF LIME
DEPOSITED VS. TEMPERATURE AND WATER USAGE
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.
Sediment and lime scale removal may be accomplished through the
cleanout opening furnished on the water heater, see FEATURES,
page 2. The heater must be drained, see DRAINING, page 11, before
removing cleanout cover on tank.
To dissolve and remove the more stubborn mineral deposits, UN•LIME
®
Professional Delimer or equivalent should be used.
UN•LIME
®
Delimer is an easy-to-handle patented food grade acid
formulated specifically for lime scale removal from all types of water using
equipment and is available in 1 gallon (Part No. 4763) and 5 gallon (Part
No. 4813) sizes. Hydrochloric base acids are not recommended for use
on glass-lined tanks.
To clean heater through cleanout opening, proceed as follows:
1. Turn off water inlet valve. Turn off the oil burner electrical disconnect
switch. Open the nearest hot water faucet, then open the drain valve
and allow all water to drain from the 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
State Part no. 99038.
6. Install cleanout plate. Be sure to draw plate up tight by tightening
screws securely.
7. Fill the water heater according to the FILLING section on Page 10..
8. Check for water leakage.
9. Replace outer jacket cover plate.
Flo-jug Method of Deliming
The Flo-Jug is the standard 5 gallon container for UN•LIME
®
-or- it is
available as a deliming kit with UN•LIME
®
, hose and fittings. Contact your
dealer, distributor or the State Water Heaters. Figure 18 illustrates most
of the following steps.
1. The heater should be prepared for deliming as described in the "Why?
When and How" booklet. The relief valve may also be delimed at this
time.
2. With the Flow-Jug upright:
•
Take off cap, remove cover under opening and install 3/4" x 4"
brass pipe nipple.
•
Drill or punch a 3/16" vent hole in handle. A stainless steel screw is
included with the Flo-Jug kit. This screw is to be installed in the
vent hole when Flo-Jug is not in use.
•
Remove drain valve from heater and insert a 3/4" x 4" drain nipple.
•
Connect the clamp 1" I. D. x 3" hole to Flo-Jug and drain nipple.
3. Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME
®
to
flow into the heater as rapidly as possible.
•
Be sure to keep the vent just above the liquid level.
4. Place the Flow-Jug in the DELIME POSITION.
•
It may be necessary to place the empty jug on its carton to trap the
solution in the heater.
•
Allow the UN•LIME
®
to attack the water scale for 5 minutes.
5. Lower the Flo-Jug to the DRAIN POSITION and allow the UN•LIME
®
to flow out of the heater as rapidly as possible.
•
Observe the vent hole and elevate the jug slightly if there is a
possibility of spillage.
•
Deliming activity is indicated by foaming on the surface of the
solution.
6. Continue the deliming process:
•
Raise jug to POUR POSITION. Allow solution to flood into heater.
•
Place jug to DELIME POSITION for 5 minutes. Solution is at work
in heater.
•
Lower jug to DRAIN POSITION and allow solution to flow out.
Observe foaming.
7. After one hour, or earlier if the deliming activity (foaming) stops, inspect
the tank interior.
•
Drain the UN•LIME® back into jug, DRAIN POSITION, and then
stand jug in DELIME POSITION.
•
Remove clamp, hose and pipe nipple from heater drain opening.
