Electrical Maintenance; Cleaning The Level Sensor; Contaminated Lifting Station Or Components - Grundfos Multilift M Montage- Und Betriebsanleitung

If the pump has been disassembled, remember to
align the vent hole in the pump with the vent hole in
Caution
the tank when remounting the pump to the tank. See
figs 31 and 32.
Fig. 31 Vent holes in pump housing and collecting tank
Fig. 32 Alignment marks on tank and pump flange

10.3 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
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 contacts will work for several years and do not require any
inspection.
• Replace the 9 V battery, if fitted, in connection with annual
service.
The above list is not complete. LC 221 may be
installed in environments which require thorough and
Note
frequent maintenance.

10.4 Cleaning the level sensor

1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
See section
2. Loosen the screw cap by turning it counterclockwise. See fig.
33.
3. Lift the pressure tube 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. See
section
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. Make sure no water remains in the hose.
6. Refit the pressure tube by screwing the screw cap on to the
tank. Reconnect the hose to the controller.
7. Check the sensor by test running Multilift M.
Fig. 33 Removing the pressure tube

10.5 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.
10.4 Cleaning
6. Operating LC 221 controller.
5.1.6 Level sensor.
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.
25