Vertical Level Switch; Operation And Maintenance; Cleaning The Pump - Grundfos Unilift KP 150 Instrucciones De Instalación Y Funcionamiento

Small difference in level: short free cable. This
cable length must at least be 70 mm, see fig. 9.
Min.
Min.
70 mm
70 mm
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‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹
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Fig. 9
* For Unilift KP 350 the distance between the bot-
tom of the suction strainer and the lowest level of
the float is 150 mm.

3.4 Vertical level switch

For pumps with vertical level switch, the difference in
level between start and stop is not adjustable. The
start/stop levels are shown in fig. 10.
Fig. 10
* For Unilift KP 350 the distance between the bot-
tom of the suction strainer and the lowest level of
the level switch is 110 mm.

4. Operation and 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.
As a precaution, the suction strainer must
always be fitted to the pump during opera-
tion.
Never dismantle the pump unless the elec-
tricity supply has been switched off.
During dismantling, caution should be
exercised as there will be access to sharp
edges, etc. which may cut.
Start
Start
150 mm
150 mm
Stop
Stop
140 mm (150 mm*)
140 mm
Start
Start
80 mm
80 mm
Stop
Stop
100 mm (110 mm*)
100 mm

4.1 Cleaning the pump

If the pump does not deliver a sufficient quantity of
water because of sediment, dismantle and clean the
pump.
The dismantling of the pump is carried out as fol-
lows:
1. Disconnect the electricity supply.
2. Allow the pump to drain.
3. Carefully loosen the suction strainer by inserting
a screwdriver in the recess between the outer
casing and the strainer and pressing it hard.
Repeat the procedure until the strainer is free
and can be removed, see fig. 11.
Fig. 11
4. Clean the suction strainer and refit it.
If the pump still does not deliver a sufficient quantity
of water, dismantle the pump as follows:
1. Disconnect the electricity supply.
2. Turn the pump housing 90° counter-clockwise
using a screwdriver, see the arrow on the pump
housing. Pull off the housing, see fig. 12.
Pump housing
Fig. 12
9