Grundfos LC 221 Series, Installation And Operating Instructions Manual

Page: 33 / 832

English (GB)
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10.1 Mechanical maintenance
• Remove possible deposits and/or sludge build-up in the
collecting tank.
• Remove any blockages on the inlet side of the lifting station.
A blockage will typically be a large solid object.
• Check and replace the gaskets of connections at valves, etc.,
if necessary.
• Check the tank for cracks and deformations. These may occur
in case of faulty assembly and therefore excessive stress on
the tank.
10.2 Electrical maintenance
• Check the gasket of the LC 221 cabinet front cover and of the
cable entries.
• Check the cable connections.
• Check the controller functions.
• Check and clean the level sensor. See section
10.3 Cleaning
the level sensor .
• If LC 221 is installed in a particularly moist environment in a
basement, we recommend checking the terminals on the PCB
in order to identify possible corrosion. In typical installations,
the terminals will work for several years and do not require any
inspection.
• Replace the 9 V battery, if fitted, in connection with annual
service.
10.3 Cleaning the level sensor
1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
See section 5.2.2 Control panel .
2. Loosen the screw cap by turning it counterclockwise.
See fig. 31.
3. Lift the sensor carefully out of the collecting tank. Do not lift it
by means of the hose.
4. Check for possible deposits on or in the pressure tube and the
condensate trap underneath the screw cap.
See section
5.1.6 Level sensor .
5. Scrape off any deposits. If necessary, remove the hose from
the controller, and rinse the tube and hose with clean water at
low pressure.
6. Refit the pressure tube by screwing the screw cap on to the
tank. Reconnect the hose to the controller. Check the sensor
by test running Multilift MOG or MDG.
Fig. 31 Removing the level sensor
10.4 Contaminated lifting station or components
If Grundfos is requested to service the lifting station, Grundfos
must be contacted with details about the pumped liquid, etc.
before the lifting station is returned for service. Otherwise
Grundfos can refuse to accept the lifting station for service.
Lifting stations which have been in contact with the pumped liquid
must be thoroughly cleaned before they are returned to Grundfos.
Any costs of returning the lifting station are to be paid by the
customer.
However, any application for service (no matter to whom it may
be made) must include details about the pumped liquid if the
lifting station has been used for liquids which are injurious to
health or toxic.
Note
The above list is not complete. The lifting station
may be installed in environments which require
thorough and regular maintenance.
Note
The above list is not complete. LC 221 may be
installed in environments which require thorough
and frequent maintenance.
TM
05
05
45
10
11
Warning
If a Multilift lifting station has been used for a
liquid which is injurious to health or toxic, it will
be classified as contaminated.