Maintenance; Electrical Maintenance; Checking The Level Sensor; Cleaning The Pressure Tube For The Sensor - Grundfos LC 221 Manual De Instrucciones

If a fault occurs, the red LED will flash, the symbol
visible and the fault will be added to the fault log. Furthermore,
the buzzer will be activated, the symbol
corresponding symbols will flash and the fault code will be
displayed. When the fault has disappeared or has been removed,
the controller will automatically switch to normal operation again.
However, the controller enables resetting of the fault indication
(visible and acoustic alarms) either manually (Man) or
automatically (Auto).
If manual resetting was selected in setup menu, the acoustic
alarm and red LED can be reset by pressing [OK]. The fault
indication will be reset when the fault has disappeared, has been
removed or the ON-OFF-AUTO switch has been set to OFF
position.
You can get an overview of faults in the fault log in information
menu.
The symbol will be visible as long as the fault log is open.
If automatic resetting was selected in menu setup, the red LED
and the symbol will disappear, and the buzzer will be
deactivated again after the fault has disappeared, has been
removed or the ON-OFF-AUTO switch has been set to OFF
position. However, even if automatic resetting was selected,
some of the fault indications have to be reset manually.
See the table above.
Every 30 minutes the fault indication will be written from the
short-term memory into the long-term memory.
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8. Maintenance

will be

8.1 Electrical maintenance

will be visible, the
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8.2 Checking the level sensor

Check for possible leaks between the pressure hose and the
bulkhead fitting of the control cabinet. The pressure hose must be
inserted to the stop (approx. 15 mm).
The sensor calibration is factory set and does not need any re-
calibration.

8.3 Cleaning the pressure tube for the sensor

1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
2. Loosen the screw cap by turning it counterclockwise.
3. Lift the pressure tube carefully out of the collecting tank.
4. Check for possible deposits on or in the pressure tube and the
5. Scrape off any deposits. If necessary, remove the pressure
6. Refit the pressure tube by screwing the screw cap on to the
7. Check the sensor by test running the lifting station.
Fig. 11 Removing the level sensor
Check the gasket of the LC 221 cabinet front cover and of the
cable entries.
Check the cable connections.
Check the controller functions.
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.
See fig. 11.
Do not lift it by means of the pressure hose.
condensate trap underneath the screw cap.
hose from the controller, and rinse the pressure tube and
pressure hose with clean water at low pressure.
tank. Reconnect the pressure hose to the controller.