Setting Of Level Switch; Startup; Maintenance And Service - Grundfos Unilift AP12 Montage- Und Betriebsanleitung

4.3 Setting of level switch

For pumps supplied with a level switch, the
difference in level between start and stop can be set
by adjusting the free cable between the level switch
and the pump handle.
The longer the length of free cable, the larger the
difference in level between start and stop.
Maximum length of free cable: 350 mm. See fig. 5.
Minimum length of free cable: 100 mm. See fig. 6.
The stop level must be above the inlet strainer to
prevent the pump from taking in air.
Fig. 5
Min. 100 mm
Fig. 6

5. Startup

Before starting the pump, check that the
Caution
inlet strainer is fitted to the pump and
submerged in the pumped liquid.
Open the isolating valve, if fitted, and check the level
switch setting.
The pump may be run briefly to check the
Note
direction of rotation without being
submerged in the pumped liquid.
Max. 350 mm
Start
450 mm
Stop
100 mm
Start
200 mm
Stop
300 mm

6. Maintenance and service

Warning
Before starting any work on the product,
make sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Before carrying out maintenance and service, it must
be ensured that the pump has been thoroughly
flushed with clean water. Rinse the pump parts in
water after dismantling.
Check the pump and replace the oil once a year. If
the pump is used for pumping liquids containing
abrasive particles or it is operating continuously, the
pump must be checked at shorter intervals.
In the case of long operating time or continuous
operation, the oil must be replaced as follows:
Liquid The oil must be replaced
temperature
20 °C
40 °C
55 °C
Warning
Out of consideration for the personal
safety and health, this work must be
carried out by specially trained persons.
Furthermore, all rules and regulations
covering safety, health and environment
must be observed.
Be careful during dismantling as you will
get access to sharp edges, etc., which
may cause cuts. Wear protective gloves.
The pump contains approx. 60 ml non-poisonous oil.
Used oil must be disposed of in accordance with
local regulations.
If the drained oil contains water or other impurities,
the shaft seal should be replaced.
after
4500 operating hours
3000 operating hours
1500 operating hours
9