felisa FE-390 Instructivo De Operación página 12

BIOLOGICAL CLEANING
Biological cleaning is used on the parts that come in contact with the distillate (such as, the distilled
water side of the condenser, or the distilling water transmission tube), to remove any biological
contamination, immerse the part in a 1% formaldehyde solution over night, do not rinse the part with
water after cleaning (avoid splashing the solution on open cuts). After the Still reassembled and
operating, reduce the cooling water in valve (23) until steams issues from the condenser vent at least 12
inches. Operate the Still in this manner for 30 to 60 minutes, ventilate the room during this operation.
CLEANING FREQUENCY
The frequency of cleaning will depend upon the purity in the water being used, for example, the
evaporator should require infrequent cleaning if it is fed with pretreated water; however, the cooling
water side of the condenser will have to be cleaned at more frequent intervals due to the fact that raw
water is flowing through it and it will scale up sooner.
The Still should be inspected at frequents intervals, until cleaning intervals are determined.
DISASSEMBLE, INSPECT AND CLEAN
Shut off and drain the Still. Shut off the water supply. Remove the condenser (2) from the Still, inspect
the cooling water side of the condenser for scale and clean as required., if required, clean the distilled
water side as described under "Biological Cleaning". Remove the heating gasket (13) and the baffle (14),
now the interior of the evaporator is visible, inspect the interior for scale and remove as required.
Disassemble the constant level device (6), inspect the level device, the drain line and the drain valve,
clean as required. Reassemble the Still, assembly is essentially the reverse of disassembly, connect the
water, waste and distillate lines. Start the Still as described under "initial Startup".
Lower the cooling water flow rate with the valve(23) until steam issue from the condenser vent 12
inches approx. Operate in this manner for 30 to 60 minutes to sterilize and clean the Still.
TEST FOR CONDENSER LEAKS
Visual test for leaks. A simple test for condenser leaks may be performed as follow: Shut off the Still heat
supply. Let the cooling water flow through the condenser until the condenser is cool. Note if there is a
flow, even in drop quantities from the distillate outlet, if there is a continuous flow, it is possible that
there is a leak from the cooling water side to the distillate side, if this is the case, the condenser must be
replaced. Pressure test for leaks. If a more positive test is required proceed as follow: Remove the
condenser from the Still. Remove the cooling water discharge tube (10), plug the discharge connection
in the condenser with a plug or stopper. Attach a hose to the cooling water inlet connection and apply
about 5 psi air pressure to the condenser. Submerge the entire condenser in a tank of water. If any air
bubbles come from the condenser, replacement is necessary.
REPAIRS
Like any other manufactured product some parts of the Still could be damaged after using for a long
time. To replace them always use original factory parts, a list of which is included in this User´s Manual.
Always order the parts with its corresponding number. All the parts can be ordered from any Distributor
or directly from our Plant.
IMPORTANT
To carry out any maintenance work, disconnect before the Still from its source of energy.
Feed water without particles, sand or biological contaminants.
Voltage variations can damage electronic components.
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