Functional Description; Replacement Of Plant Membranes - BWT PERMAQ COMPACT 41 Installation And Operating Manual

11 FUNCTIONAL
DESCRIPTION
The raw water that is led to the
plant must be of drinking water
quality and must not contain resid-
ual chlorine. If the content of free
chlorine in the raw water is > 0.1
mg/l, then a carbon filter has to be
fitted ahead of the plant.
The stated capacities and quality
are based on a salt content in the
raw water of maximum 500 mg/l
TDS and 10 °C. In case of another
raw-water quality, contact
supplier. (See also chapter regard-
ing water quality).
The desalinated water passes the
RO membranes and is subsequent-
ly collected in the pressure storage
tank. The water containing concen-
trated salts (concentrate) is led
through the RO module(s) and
further on to the sewer. The per-
meate/drain proportion is manual-
ly adjusted by means of a needle
valve.
A pressure switch at the raw-water
inlet will stop the raw-water pump
in case of too low inlet pressure (<
0.5 bar). In case of a short-time
pressure drop on the raw-water
inlet, control of the plant will per-
form an automatic restart. An LED
on the controls will flash during the
automatic restart. By permanently
low pressure the plant will stop and
the LED will be on. To restart the
plant you have to disconnect and
subsequently reconnect the power
(disconnect for approx. 5 seconds).
The desalinated water automatical-
ly is led to consumption. The con-
sumption amount is limited howev-
er, by both the permeate capacity
of the plant and by the size of the
pressure tank (3.5 litres).
The plant is provided with rollers
and should be installed with flexi-
ble connections. The plant can be
placed under a standard table and
simply pulled out for servicing.
Under normal operating conditions
the RO membranes have a long
lifetime. But even with good water
quality, a coating of impurities will
– to some extent – take place and
this will cause a gradual reduction
of the permeate capacity. When
the capacity has been reduced by
10 %, the membranes must be
cleaned. If regular cleaning is car-
ried out at the correct intervals, the
original capacity can be easily
the
restored.
Note: The permeate capacity is
also directly dependent on the raw-
water pressure and the water tem-
perature. Poorer pressure and
temperature will reduce the capaci-
ty, and increasing pressure and
temperature will increase the ca-
pacity.
In case of reduced capacity, the
raw-water pressure and tempera-
ture must be checked before pro-
ceeding to the membrane replace-
ment procedure.
12 REPLACEMENT OF
PLANT MEMBRANES
Before cleaning,
below procedure:
1. Switch off the power to the
plant.
2. Dismount the plastic pipe
located at the end of the
membrane housing. Please
note the
tion/connection of the pipe
since on re-fitting the pipe; it
must be placed in the exact
same location. The pipe can
be pulled out by pressing
down the ring located on the
stainless fitting. When press-
ing down the fitting as far as
3.
4.
5.
6.
please follow
7.
exact loca-
8.
9.
10. Close the recirculation valve
UK
it goes, the pipe can be pulled
out.
Dismount the lock placed at
the end of the membrane
pipe. (The lock keeps the
membrane end plate
place).
The end plate can now be
pulled out of the membrane
pipe by wriggling the end
plate from side to side and
pulling upwards at the same
time.
Now pull the membrane up
and out of the membrane
pipe. Note at which end the
large, black V-cup seal ring is
placed on the outside of the
membrane. On fitting the new
membrane, it must be placed
at the same end of the mem-
branes as the old one, i.e. if
the old V-cup seal ring was
placed at the top of the mem-
brane pipe, then the new V-
cup seal ring must be placed
in such a way that it will also
end up being placed at the
top when the membrane is re-
fitted in the membrane pipe.
When the membrane has
been replaced and the end
plates refitted with the lock in-
serted, then all pipes must be
reattached. Note: On re-
establishing the pipe connec-
tion, the "ring" must be
pushed down entirely and the
pipe must be pushed down
hard as far as it will go.
When all connections have
been re-established and end
plates have been properly se-
cured with the lock, the plant
must be restarted.
Reconnect the raw water to
the plant.
Open the outlet valve V02
completely.
V01 tightly.
in
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