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Operation & maintenance manual, Drum filter HDF 12/16/20/24 -series
6. START-UP AND OPERATION
6.1 Check procedures during start-up
1. Check that the drive unit cover is installed correctly.
2. Turn the pump switch to the OFF (0) position (see F in Figure 6.1).
3. Set the main power switch to the ON (1) position (see J in Figure 6.1).
4. Set the mode selector to the HAND position (see E in Figure 6.1).
5. Open the water supply partially so that water slowly flows into the filter drum. Make sure that
the difference in water level between the inside and outside of the filter drum does not exceed
450 mm (see section 6.2.1). If the filter fabric becomes clogged, it may be necessary to fill the
filter tank/chamber with water from an external source or to remove a filter element and allow
unfiltered water to run into the filter tank (chamber).
A greater difference in water level between the inside and outside of the filter drum than
450 mm will damage the filter.
6. When the water level inside the filter tank (or concrete chamber) has risen above the pump
suction pipe (or the pump if a CRK or MTR pump is installed), the pump switch must be set to
position 1 (ON).
NB.
Also read section 2.7 (Safety instructions).
The backwash pump must not be started until the water level has risen above the suction
pipe (or pump if a CRK or MTR pump is installed), otherwise the pump can run dry and
fail.
7. When the water level inside the tank (or concrete chamber) reaches the overflow wall, turn the
operation mode selector from the HAND to AUTO position.
8. Fully open the water supply. The filter is now run in the mode for automatic level control. It
may be necessary to adjust the level sensor so that the filter can be run optimally (see section
6.2.4).
