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8.11 Self-cleaning prefilter
This section is only relevant, if the AQpure system is
Note
equipped with a self-cleaning prefilter module. See
fig. 5, pos. 7.
The self-cleaning prefilter removes particles larger than 100 µm
from the feed water. It is automatically backwashed, but requires
manual maintenance after a certain period of time.
The system indicates the requirement for this maintenance task
with a warning or an alarm. See section:
alarms.
Position of the component
See fig. 8, pos. 5.
8.11.1 Safety instructions
Warning
Danger of personal injury due to contact with
chemicals!
Wear the stipulated personal protective equipment
(protective clothing, gloves, goggles, etc.) when
handling chemicals!
Observe the chemical manufacturer's safety data
sheets (MSDS) and safety instructions of the used
chemicals!
Observe the separate supplier documents for the
Caution
components. All supplier documents are part of the
documentation package delivered with the system.
8.11.2 Preparations
The following tools are required for this maintenance task:
•
nylon brush
•
high-pressure cleaner
•
empty bucket
•
bucket with sodium hypochlorite solution
•
chemically resistant gloves
•
tight-fitting protective goggles
•
water-tight foil
8.11.3 Prefilter overview
5.1
5.2
5.10
5.9
64
5.8
2
Fig. 19 Prefilter overview
Pos. Description
2
Manual valve
5.1
Cylinder
5.2
Elbow fitting
5.3
Union nut
5.4
Clamp
5.5
Union nut
38
7.5 Warnings and
5.3
5.4
5.5
5.6
5.7
Pos. Description
5.6
Screws
5.7
Union nut
5.8
Bottom housing
5.9
Support clamp
5.10 Top housing
64
Manual valve
8.11.4 Maintenance of prefilter
Read section:
8.11.1 Safety
instructions.
The following steps refer to fig.: 19-20.
1. Unless the system is already stopped due to an active alarm,
stop the system by pressing the [Stop] button on the HMI.
Warning
Danger from running system!
Make sure, that the Grundfos Eye has stopped
rotating before starting any work on the system
components or lines!
2. Put on chemically resistant gloves and tight-fitting protective
goggles.
3. Prepare a bucket with a 0.05 % sodium hypochlorite solution.
See section:
8.6.2 Sodium hypochlorite
strong inorganic fouling, HCl (ph value 2) or citric acid can be
used alternatively.
4. Close valve (64).
5. Cover all electrical components around and below the working
area with water-tight foil, so that no water can ingress and
damage those components.
6. Disconnect the hose from elbow fitting (5.2).
– Seal the hose with the provided push-in fitting. Otherwise
the whole membrane will drain.
– The elbow fitting is a special fitting that cannot be replaced
by a standard fitting.
7. Place an empty bucket underneath manual valve (2).
8. Open valve (2) for approximately 20 seconds to empty the top
part of the prefilter.
– Do not drain too much water to avoid draining the feed
pump. A drained feed pump requires the whole system to be
deaerated by certified service staff.
9. Loosen clamp (5.4).
10. Unscrew union nut (5.3).
– Be careful not to loose or damage the O-rings.
11. Remove top housing (5.10) together with cylinder (5.1).
12. Carefully pull cyclone system (5.11) out of bottom housing
(5.8).
If the bottom housing is dirty, proceed with the following steps.
Otherwise proceed with step 17.
13. Slowly open manual valve (2) until the water level inside the
bottom housing (5.8) reaches union nut (5.7).
– Do not drain too much water to avoid draining the feed
pump. A drained feed pump requires the whole system to be
deaerated by certified service staff.
14. Remove screws (5.6) of support clamp (5.9).
15. Unscrew union nuts (5.7) and (5.5).
– Be careful not to loose or damage the O-rings.
16. Remove bottom housing (5.8) from the system.
solution. In case of
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