Maintenance; Maintenance Of The Dosing Pumps; Maintenance Of The Suction Lines - Grundfos Oxiperm OCD-164 Montage- Und Betriebsanleitung

9. Maintenance

Warning
Before any maintenance work, i.e. when exchanging
parts and gaskets, the entire system has to be rinsed
with water.
Before maintenance work, all chemicals must be
completely removed!
When handling acids or lyes, wear appropriate
protective clothing.
Maintenance and repair work must only be carried
out by authorized specialists.
According to the German accident prevention
regulations GUV 8.15 and VGB 65 § 19, chlorine
dioxide systems must be regularly checked for
safety, at least once a year and prior to every startup,
Note
by a specialist.
This check can be carried out by the after-sales
servicing department during the six-monthly
maintenance.

9.1 Maintenance of the dosing pumps

A drop in performance of the dosing pumps may be caused by
contamination in the suction and discharge valves.
9.1.1 Dismantling and cleaning the valves
1. Unscrew the suction and discharge valves.
2. Use a pin (∅2) to press out the ball cage, ball and O-ring from
below.
3. Replace damaged parts.
When re-assembling, observe the correct position of the parts,
see fig. 25.
Fig. 25 Construction of the valves
Pos. Description
1 Valve body
2 Ball cage
3 Seat
4 Ball
5 O-ring
When installing the valves, make sure that the flow
direction is correct (arrow).
Note
The O-ring must be inserted correctly into the
provided groove.
9.1.2 Dismantling the diaphragm
For safety reasons, the dosing diaphragm should be replaced
after a maximum of 2000 operating hours.
1. Insert the suction lines of the pumps into a water tank, and run
the system until the dosing heads of the pumps have been
well purged with water.
2. Open venting screws by one rotation until the venting lines are
also purged. Switch off the system.
3. Loosen the four dosing head screws.
4. Remove the dosing head, and unscrew the diaphragm by
rotating to the left.
Assembly
1. Insert the intermediate ring so that the relief hole points
downwards.
2. Screw in the diaphragm.
3. Switch on the pump briefly until the diaphragm is located at
the rear dead point.
4. Carefully fit the dosing head, and uniformly and gently tighten
the screws in a diagonally opposite sequence, so that the
dosing head is not damaged.
5. Vent the pump.

9.2 Maintenance of the suction lines

The suction lines are equipped with foot valves and filter nuts.
The Reed contacts are integrated in the suction line body. The
floats with magnet core are located axially on the valve body and
are sliding.
The foot valve should be dismantled and cleaned occasionally, at
the latest when the suction performance drops.
The function symbol (NO contact) must be present on the top
surface of the two floats.
If this is not the case, disconnect the float and reverse the
polarity.
OCD-164 Product No.
-30 to -220 95730320
-350 to -2000 95730321
Fig. 26 Suction line, spare parts
Pos. Description
1 Float switch, PVC
2 Ball
3 Valve seat, grey PVC
4 Filter nut, PVC grey
(553-1995)
(553-1996)
39