Startup; Maintenance And Service; Electrical Maintenance; Cleaning The Pressure Tube Of The Level Sensor - Grundfos LC 220 Manual De Instrucciones

6. Startup

Warning
Before making any connections in LC 220 or
working on pump, pit, etc., make sure that the
power supply has been switched off and that it
cannot be accidentally switched on.
Prior to startup, the connection and DIP-switch setting must have
been carried out according to sections 5.3 Electrical connection
and 5.5 Setting.
Startup must be carried out by authorised personnel.
Proceed as follows:
1. Check all connections.
2. Open the isolating valves in discharge and inlet lines.
3. Switch on the power supply.
4. Push the ON-OFF-AUTO selector switch to automatic mode.
5. Activate a sanitary appliance connected to the inflow of the
lifting station, and monitor the increasing water level in the
tank up to the start level. Check the starts and stops at least
twice.

7. Maintenance and service

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.
Maintenance should be carried out by authorised personnel and
must include electrical and mechanical maintenance.
We recommend to enter a maintenance contract with Grundfos to
ensure a consistent operational safety of the system.

7.1 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 7.2 Cleaning
the pressure tube of 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.
7.1.1 Checking the level sensor
Check for possible leaks between pressure hose and bulkhead
connector of the controller. The pressure hose must be inserted
to the stop (approx. 15 mm).
The sensor's calibration is factory-set and does not need any
re-calibration.
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7.2 Cleaning the pressure tube of the level sensor

1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
See section 4.2 Control elements and indicator lights.
2. Multilift: Loosen the screw cap by turning it counterclockwise.
Unolift: The pressure tube is not fastened by means of a
screw cap, but can be lifted out directly.
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 4. Product description.
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 lifting station.