Pumping To Low Water Level; Thermal Protection; Maintenance; Cleaning - Grundfos Unilift CC 5 Manual Del Usuario

8.4 Pumping to low water level

When the suction strainer has been removed, the
pump can pump down to 3 mm.
Remove the suction strainer by inserting a
screwdriver between the pump sleeve and the
suction strainer and turning it.
Fig. 11 Removal of suction strainer
These conditions must be fulfilled:
• The pump must be placed on an even, horizontal
surface.
• The water must not contain particles which may
block the pump inlet.
• Minimum water level when the pump is started:
5 mm.
Fig. 12 Low water level

8.5 Thermal protection

If the pump is running without water, or if it is
otherwise overloaded, the built-in thermal switch will
cut out.
When the motor has cooled to normal temperature, it
restarts automatically.

9. Maintenance

Under normal operating conditions, the pump is
maintenance-free.
If the pump has been used for liquids other than
clean water, it should be flushed through with clean
water immediately after use.

9.1 Cleaning

Warning
Before starting work on the product,
switch off the power supply. Make sure
that the power supply cannot be
accidentally switched on.
Cleaning the suction strainer
1. Switch off the power supply to the pump.
2. Drain the pump.
3. Loosen the suction strainer by inserting a
screwdriver between the pump sleeve and the
strainer and turning it. See fig. 11.
4. Clean and refit the suction strainer.
Cleaning the impeller
1. Switch off the power supply to the pump.
2. Loosen the suction strainer by inserting a
screwdriver between the pump sleeve and the
strainer and turning it. See fig. 11.
3. Remove the bottom part. See fig. 13.
Fig. 13 Removal of bottom part
4. Remove and clean the diaphragm.
5. Flush the pump with clean water to remove
possible impurities between the motor and the
pump sleeve. Clean the impeller.
6. Check that the impeller can rotate freely.
7. Assemble the pump in reverse order of
dismantling.
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