Elmo Rietschle L-BV3 - Manual (Page 25)

Servicing
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Contamination/Problem Remedy
Dirt collects in the motor
cooling fins. Clean the motor cooling fins at regular intervals.
Fine-grain dirt (e.g. sand) get
into the vacuum
pump/compressor with the
operating liquid or pumped
gases/vapors. Install a liquid separator, filter or screen in the feed pipe.
It is prohibited to remov ethe vacuum pump/compressor housing!
Impeller is jammed. Free shaft by turning.
To do so, proceed as follows:
 Shut unit down.
 Guide a screwdriver through the central opening in the fan guard up to the
shaft end on the external fan side (see Fig. 10, Pg. 23).
 Turn the shaft by hand using the screwdriver.
 Remove the screwdriver again.
Extremely hard water used
as operating liquid
Lime content > 15°dH). Soften operating liquid.
OR
Decalcify the pump-motor unit at intervals of 3 months.
To do this, proceed as follows (also see Fig. 11, Pg. 26):
 Wear personal protective equipment (protective gloves and safety
goggles),
 Shut unit down.
 Drain pump-motor unit as described in Chapter 9.1, "Draining", Pg. 22.
 Remove pipes/hoses.
 Fill the unit with decalcifying liquid through one of the connection
openings. Use 10% solution of acetic acid or another commercially
available decalcifying agent
.
 Allow the decalcifying liquid to soak for at least 30 minutes.
 Turn the shaft occasionally during this time. To do this, guide a
screwdriver through the central opening in the fan guard up to the shaft
end on the external fan side (see Fig. 11, Pg. 26).
 Turn the shaft using the screwdriver.
 Remove the screwdriver again.
 Drain the decalcifying liquid out of the unit. To do this, proceed as
described in Chapter 9.1, "Draining", Pg. 22.
 Mount pipes/hoses.
 When commissioning the pump-motor unit, proceed as described in
Chapter 7, "Commissioning", Pg. 16.
 The decalcifier can be disposed of in the sewer system.
Dirt gets into the air
passages (fan guard,
external fan, cooling fins) of
the motor. Clean the motor air passages regularly.
To do so, proceed as follows:
 Carry out protective measures for the use of compressed air:
Wear personal protective equipment (protective gloves and safety
goggles),
secure surroundings. Remove objects lying around.
 Blow in compressed air through the fan guard grate.
 It is prohibited to remove the fan guard!