State GPO 69 700OE - Manual (Page 12)

12
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 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.
To clean heater through cleanout opening, proceed as follows:
1. Drain the water heater per the DRAINING section on page 11.
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 9.
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.
• Observe interior through opening - a small flashlight works well.
• If the interior still shows water scale, the deliming process should
be continued.
• To check UN•LIME® for continued use or reuse, place some lime
scale or white chalk into a glass with a small 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.
DELIMING THE GPO WATER HEATER
FIGURE 19.
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 Flo-Jug.
9. When flushing is completed:
• Fill heater being certain to expel air from tank through a nearby
hot water faucet.