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SHUTDOWN PROCEDURE
Draining the Water Heater
1. Turn off the main electrical power to the
water heater. If the power disconnect point
is out of sight, lock it in the open ("OFF")
position and tag to prevent unexpected
application of power.
2. Turn the valve in the water heater's cold
water supply to the closed or "OFF"
position.
3. Turn the valve in the water heater's hot
water outlet to the closed or "OFF"
position.
4. Manually open the temperature and
pressure relief valve to remove any
pressure from the storage tank.
5. Allow the system to cool and then open
the drain valve to empty the storage tank.
It will be necessary to manually hold the
temperature and pressure relief valve in
the open position to break the vacuum in
the tank and allow it to vent and drain.
Ensure that the water heater drain is routed
to a properly sized floor drain to allow the
water to be removed from the tank. If a
floor drain is not available, a hose may be
attached to the water heater drain to take
the water outdoors.
6. The water heater is now shut down and
ready for service or maintenance.
7. Follow the filling and start up procedure to
place the water heater back into service.
MAINTENANCE
Listed below are items that must be checked to
insure safe reliable operations. Verify proper
operation after servicing.
FLUSHING THE STORAGE TANK
1. Turn off main power at the electrical
disconnect switch.
2. Open the drain valve. Allow water to flow
until it runs clean.
3. Close the drain valve when finished
flushing.
4. Turn on the electrical disconnect switch
(after filling).
SEDIMENT REMOVAL
Water born impurities consist of dissolved
minerals which precipitate out of the heated water
and fine particles of soil and sand which settle out
and form a layer of sediment on the bottom of the
tank. In time, if not removed, the level of
sediment might reach the heating elements.
For convenience, sediment removal and element
lime scale removal should be performed at the
same time as follows:
Sediment and Lime Scale Removal
Sediment and lime scale accumulation on the
heating elements is a normal condition common to
all immersion type elements. Factors which affect
the amount of this formation are:
1. Amount of hot water used. As the volume
of water increases, more scale results.
2. Water temperature. As the temperature of
the water is increased, more scale is
deposited on the elements.
3. Characteristics
Regardless
of
elements should be examined regularly.
Scale accumulation in the bottom of the storage
tank may be removed by turning off main power
and draining the tank. Once all water is removed,
the hand hole access can be removed. This will
allow large accumulations of scale to be cleaned
from the bottom of the tank.
Water scale accumulations on the immersion
heating element reduce the ability of the elements
to heat water and may cause noise to occur during
of
water
supply.
water
treatment,
the
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