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14
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit to
operate at its designed efciency:
1. Once a month the heater should be ushed. 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.
6. Install cleanout plate. Be sure to draw plate up tight by tightening
screws securely.
7. 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.
FIGURE 9
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 hose and ttings. Contact your dealer
or distributor.
Figure 9 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 Flo-Jug upright:
• Take off cap, remove cover under opening and install 3/4" x 4"
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" nipple.
• Connect and clamp 1" I.D. x 3" hose to Flo-Jug and heater nipple.
3. Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME
to ow into the heater as rapidly as possible.
• Be sure to keep the vent just above the liquid level.
4. Place the Flo-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 ow out of the heater as rapidly as possible.
• Observe the vent holes 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 ow into heater.
• Place jug in DELIME POSITION for 5 minutes. Solution is at
work in heater.
• Lower jug to DRAIN POSITION and allow solution to ow 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 the clamp, hose and the pipe nipple from heater
drain opening.
• Observe interior through opening - a small ashlight may be
used effectively.
• 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 solution. If
the material is vigorously dissolved by the solution, the UN•LIME
can be reused. If not, the UN•LIME has been weakened and
should be replaced.
8. When deliming has been completed, the heater should be ushed
for 3 to 5 minutes with fresh water.
• Remove the deliming equipment, install the drain valve, open the