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The system must be inspected once a month by the opera-
tor with regard to serviceability and leaks by observing a
switching cycle.
CAUTION:
Always disconnect the system from the mains supply be-
fore servicing! Observe the safety instructions!
Only authorised qualified persons may carry out the ins-
pection and maintenance tasks described below.
Repairs may only be carried out by the manufacturer.
When servicing lifting systems, the DIN 1986, Part 3 must
be observed. Maintenance must be carried out regularly by
authorised qualified persons..
IMPORTANT:
All screws may only be tightened with a maximum
force of 3 N
The following tasks must be carried out:
• Visual inspection of the entire system, the pumps and the
fittings
• Thorough cleaning of the entire system and the pump
• Inspection of the entire system and pump casing for ex-
ternal damage and visible wear
• Inspection of the pump to ensure it runs smoothly and for
wear and deposits
• Inspection of the connection lines for mechanical damage
and wear
• Inspection of the seal connections for leaks; in the event
of recognisable wear, exchange the seals (e.g. O-ring)
• Check the insulation on the pump motor
• If necessary test the function of the blocking device
• The check valve must be replaced after 2 years service.
7.1 Information about the pump
The pump should be inspected at regular intervals. When
the operating noises become louder or there are vibrations
in the pipe system, the pump casing and impeller need to
be checked for any ingrained dirt or wear.
To do this, unscrew the four attachment screws on the motor
unit and remove from the pump casing.
When inspecting the pump casing, note that the venting bo-
rehole must remain open under all operating conditions.
7. Inspection and maintenance
19
7.2 Information about the backflow preventer
The backflow preventer can be used to completely empty
the pressure line by manually lifting the check valve of the
lifting system. To do this, turn the flap opener with a size 8
(15 mm) wrench and hold (see Fig. 2) until the pressure line
is empty. After this, the flap opener must be returned to its
original position or the marked operating setting (see Fig. 3).
Ill. 2
Ill. 3
Note:
When the screw connections on the lower and upper flan-
ge of the valve casing are unscrewed, the entire valve ca-
sing can be removed for cleaning and maintenance purpo-
ses. Of course before this happens the pressure line must
be blocked and drained.
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