Electrical Maintenance; Cleaning The Level Sensor; Contaminated Lifting Station Or Components - Grundfos Multilift M Serie Instrucciones De Instalación Y Funcionamiento

If the pump has been disassembled, remember to
align the vent hole in the pump with the vent hole
Caution
in 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 10.4 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 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
Note
and frequent maintenance.

10.4 Cleaning the level sensor

1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
See section 6. Operating LC 221 controller.
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 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.
7. Check the sensor by test running Multilift M.
Fig. 33 Removing the pressure tube

10.5 Contaminated lifting station or components

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.
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.
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