BWT PERMAQ COMPACT 270 Series, Installation And Operating Manual

Page: 17 / 36

UK
17
11. FUNCTIONAL
DESCRIPTION
The water is pressed through the
RO membrane by means of a
high-pressure pump. The per-
meate (desalinated water) is
then led to consumption and can
e.g. be collected in a reservoir.
The concentrate (the water con-
taining the concentrated salts) is
led to outlet. The relation be-
tween permeate/ concentrate
shall be adjusted manually on
the needle valve.
Under normal operating condi-
tions the RO membranes have a
long lifetime. But even with a
good raw-water quality, layers
of impurities will, to a certain
extent, occur and there will be a
slow reduction of the permeate
capacity.
12. CLEANING/REPLACE-
MENT OF MEMBRANES
Read section 12 carefully before
cleaning/replacing the mem-
branes.
12.1 Cleaning procedure:
Following shall be done prior to
cleaning:
Empty out approx. 100 litres of
treated water from the reservoir
tank.
Switch off the power supply.
Shut off the raw-water supply.
Dismount the raw-water inlet
hose at the opposite end of the
pre-fitler (M-Figure 3).
Take out the filter cartridge lo-
cated in the pre-filter housing
(M-Figure 3). Fill the filter hous-
ing with raw water before re-
mounting it.
Open the outlet valve (B-Figure
3) completely and close the
recirculation valve (D-Figure 3).
Lead the permeate hose (A-
Figure 3) away from the reser-
voir tank and lead the hose up
into the bucket containing clean-
ing agent.
Take a plastic bucket, , mini-
mum 25 litres, or order special
CIP tank for BWT PERMAQ
®
Compact 271-274 from BWT
and fill in 25 litres of warm raw
water 40°C.
Place the bucket on a somewhat
higher level than the pre-filter
(M-Figure 3)
Lead the raw-water connection
all the way into the bucket.
Short the wires on the safety
pressure switch fitted on the
filter housing (M-Figure 3) by
connecting the 2 wires or jump
the terminals 1 and 4.
Lead the outlet hose (C-Figure 2)
into the bucket with the heated
water.
Start the plant by re-connecting
power to the plant.
When it starts up, the plant will
make some “noise” until the
warm water has entered the
plant.
Operate the plant in this way for
20-30 minutes, until the plant
components
(membranes/-
pump) are heated up to approx
40°C. Replace the water in the
bucket continuously in order to
keep the water at 40°C during
the heating period.
When the plant components are
heated up at 40 °C, you must
stop the plant by switching off
the power.
Re-fill water into the bucket,
40°C. We recommend using
treated water for this purpose.
Mix in citric acid in the ratio 2%
in 25 litres of water. I.e. ½ kg
citric acid for 25 litres of water.
Re-start the plant by switching
on the power.
Operate the plant for 5 min.
with this solution of citric acid.
Then stop the plant for 5
min.perate the plant again for 5
min. This procedure must be
carried out 3 times, i.e. 3 times
5 minutes in operation and 3
times 5 minutes’ break between
each operating period.
If the membranes are much
clogged due to belated clean-
ing, it is recommended to per-
form the cleaning procedure
from the start once more with a
new solution of citric acid. This
extra cleaning should not be
necessary if the capacity has
only dropped by 10 %.
When the cleaning procedure is
finished, the cleaning agent
shall be disposed of in a sensi-
ble way, and the raw-water
hose (A-Figure 2) shall be re-
connected to the raw water.
The outlet hose (C-Figure 2)
shall be led back into the drain.
Refit (possibly a new) 5”-5µ
filter cartridge in the pre-filter
housing (M-Figure 3) and re-
connect the wire to the pressure
switch on the pre-filter.
Restart the plant and flush the
plant for 20-30 minutes.
When the plant has been
flushed,
adjust the out-
let/recirculation valve (B-Figure
3) again. (see section: Start-up
of Plant).
When the plant operating pres-
sure, which can be read on the
manometer (E-Figure 3) has
reached 13.5-14.5 bar, check
the permeate hose (A-Figure 3)
to make sure the water quality is
<20 µS/cm (conductivity meter
can be supplied as aux. equip-
ment). If the water quality is >20
µS/cm, then the plant must op-
erate for 10-20 min. before
making a new check-up.
Check if the plant capacity, read
on the flow meter (F-Figure 3), is
satisfactory.
When capacity and water quali-
ty are alright, lead the permeate
hose (A-Figure 3) back into the
reservoir tank.
Now the plant is ready for nor-
mal operation.
If the plant does not reach full
capacity after cleaning, you
must perform a new cleaning.