Maintenance; Electrical Maintenance; Mechanical Maintenance; Cleaning The Pressure Tube - Grundfos LC 109 Service Kit Instructions

CU 211
LEDs shown on a CU 211 / CU 214
Fig. 11
Checking sensor function
Fig. 12
Switching point measured from
bottom edge of the tube [mm]
Signal
MSS, M, MD
S4 on 224
S3 on 194
S2 on 154
S1 on 74
S1 off 20
8

8. Maintenance

1

8.1 Electrical maintenance

The electrical parts are maintenance-free.

8.2 Mechanical maintenance

Regularly check that the pressure hose is fitted
correctly and that it does not leak.

8.3 Cleaning the pressure tube

1. Set the ON-OFF-AUTO selector switch on the
2. Loosen the screw cap by turning it
3. Lift the pressure tube carefully out of the
4. Check for possible deposits on or in the pressure
5. Scrape off any deposits. If necessary, remove the
6. Refit the pressure tube by screwing the screw
7. Check the sensor by running a test.

9. Disposal

This product or parts of it must be disposed of in an
MLD, MDV, MD1
environmentally sound way:
477
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
427
340
74
20
Warning
Before working on the level converter
or LC controller, make sure that the
power supply has been switched off
and that it cannot be accidentally
switched on. Make sure that the
controller is disconnected from mains
before servicing.
controller to "OFF"
counterclockwise.
collecting tank. Do not lift it by means of the
hose.
tube and in the condensate trap underneath the
screw cap.
hose from the level converter and rinse the tube
and hose with clean water at low pressure.
cap onto the tank. Reconnect the hose to the
level converter.
Grundfos company or service workshop.
Subject to alterations.