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

9. Maintenance and service

The Multilift MSS requires a minimum of maintenance.
Warning
Before carrying out maintenance and service on
lifting stations used for pumping liquids which
might be hazardous to health, make sure that the
lifting station has been thoroughly flushed with
clean water and that the discharge pipe has been
drained. Rinse the parts in water after
dismantling. Make sure that the isolating valves
have been closed. The work must be carried out
in accordance with local regulations.
Warning
Before making any connections in LC 220 or
working on lifting stations, make sure that the
power supply has been switched off and that it
cannot be accidentally switched on.
According to EN 12056-4, lifting stations in single-family houses
must be checked once a year. During the check, local regulations
must be observed.
The periodic checks of the lifting station should be carried out by
authorised personnel and must comprise electrical and
mechanical maintenance.
Check the following points:
• Discharge and inlet connections
Check all connections to the lifting station for tightness and
leakages. Make sure that weight from the inlet, discharge and
venting pipes does not rest on the tank. Long pipe sections,
valves, etc. must be supported.
• Power consumption
See nameplate.
• Cable entry
Make sure that the cable entry is watertight and that the
cables are not bent sharply and/or pinched.
• Pump parts
Check that the vent hole of the pump housing is clear by
dismantling the pump from the support flange.
Do not loosen the support flange. It is screwed
and sealed to the collecting tank. Loosen the four
Note
stainless steel clamps instead.
We recommend replacing the O-ring sealing between pump
and support flange.
Make a test run with clean water. In case of noise, vibration or
abnormal running, contact Grundfos.
• Shaft seal
Check the shaft seal, O-ring and oil. The oil chamber contains
60 ml non-poisonous oil. Used oil must be disposed of in
accordance with local regulations. This work must be carried
out by the manufacturer or an authorised service workshop.
See service instructions.
Cleaning the non-return valve (if required)
Proceed as follows:
1. Close the isolating valves in the discharge pipe and in the
inlet pipe (if fitted) or drain the discharge pipe by tightening
the drain screw on the side of the non-return valve.
See section 5.1.3 Non-return valve.
2. Clean the non-return valve via its inspection cover.
Replace the gasket of the inspection cover when
reassembling the non-return valve.

9.1 Electrical maintenance

• Check the gaskets of the LC 220 cabinet front cover and of the
cable entries.
• Check the cable connections.
• Check the controller functions.
• Check and clean the pressure tube. See section 9.2 Cleaning
the level sensor.
• If LC 220 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 many 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 220 may be
installed in environments which require thorough
Note
and frequent maintenance.

9.2 Cleaning the level sensor

1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
See section 5.2.2 Control elements and indicator lights.
2. Loosen the screw cap by turning it counterclockwise.
See fig. 19.
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 5.1.4 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 MSS.
Fig. 19 Removing the pressure tube

9.3 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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