Maintenance Work On The Duplex Filter - Filtration Group Pi 370 Betriebsanleitung Und Montageanleitung

13.2 Maintenance work on the duplex filter

1
The flow direction is indicated by the
pictogram on the switch-over handle (refer to
Figure 5).
 Operate the switch-over handle (5) and shift it to the
required position:
- Switch-over handle in position A: filter 1 (F1) is
deactivated while filter 2 (F2) is activated.
- Switch-over handle in position B: filter 2 (F2) is
deactivated while filter 1 (F1) is activated.
- The switch-over handle indicates the deactivated filter.
- Switch-over handle in position C: fluid flows through
both filters (F1 and F2).
A
F1
Fig. 5: Switch-over handle positions
 Make sure the switch-over handle (5) is set to the
required position, so that it contacts the stop and is
locked correctly by the safety catch.
 The filter side on which the element must be replaced is
sealed off.
Danger if fluids leak!
 Never operate the switch-over handle while carrying
out maintenance work!
 Wear protective clothing and equipment appropriate to
the hazard potential of the medium (e.g. eye protection,
respirator, protective clothing, etc.).
2
 Place a trough or a drip pan underneath the unit.
 Open the vent screw (2) at least one turn.
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Translation of the original instructions with installation instructions Pi 370 / Pi 3700, Filtration Group GmbH, 28.06.2020, Mat. No. 72412144, Version 06
B
C
F2
CAUTION!
3
 Open the drain plug on the dirty side (7) (if any).
 The filter is discharged.
1 2
5
7
Fig. 6: Discharging the filter
5
 Carry out the maintenance work.
 Check the seals of the drain plug and the vent screw (if
any) and if necessary replace.
6
 Screw in the drain plug (torque: 30 Nm) (if any).
7
 Operate the switch-over handle and shift it to the middle
position.
 Tighten the vent screw as soon as fluid exits from the
vent hole without any bubbles (torque: 25 Nm).
 Check that the filter is tight.
8
 Make sure the switch-over handle contacts the stop and
is locked by the safety catch, so that the filter side that is
being maintained is deactivated (as indicated by the
pictogram on the handle).
 Observe the duplex filter.
Does it operate normally?