Mechanical Maintenance; Electrical Maintenance - Grundfos Multilift MD Montage- Und Bedienungsanletung

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.
Note: The above list is not complete. The lifting station may be
installed in environments which require thorough and frequent
maintenance.
10.2 Motor
Check the direction of rotation of the pump in the following way:
• Turn off the power.
• Unscrew the lifting eye on top of motor. See fig. 31.
• The top of the motor shaft is now visible. See fig. 32.
Check that rotor and impeller can be turned freely by turning
the shaft with a large slotted screwdriver.
Fig. 31 Lifting eye
Fig. 32 Top of slotted motor shaft
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
figures 33 and 34.
26
Fig. 33 Vent holes in pump housing and collecting tank
Fig. 34 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