BWT PERMAQ PRO 2000, Installation And Operating Manual

Page: 8 / 36

UK
8
8. AUTOMATIC
FUNCTIONS
The BWT PERMAQ
®
Pro 2000
plant is equipped with a control
box which has following built-in
control functions:

Level switch (option) for
start/stop of high pressure
pump

Indication of low water
level and stop of transport
pump (option)

Solenoid valve controls
feed water inlet

Pressure switch for
start/stop transport pump
(option)

Alarm will go off when
feed water pressure drops
below 0.5 bar for more
than 2 min

Stop of pump is delayed by
20/30 seconds.

Extra level switch, Alarm
High level (Option).

Alarm conditions and DIP-
switch - se section 9.2.10
and 9.2.11.
9. MAINTENANCE AND
TROUBLE-SHOOTING
(
See also encl. “13.5 Operating
journal”).
9.1 Maintenance:
The BWT PERMAQ ® Pro is pro-
duced and designed for a min-
imum of maintenance and ser-
vice. However there are some
functions which should be
checked regularly, therefore it is
important
to comply with
maintenance intervals.
Maintenance
intervals are
compiled by updating BWT
PERMAQ
®
Pro’s operating
journal “13.5 Operating jour-
nal”.
Daily:

Capacity permeate FI1

Conductivity (option) QIS 1

Pressure after the high-
pressure pump PI1

Feed water pressure

Feed water temperature

Draw daily feed water sam-
ples (applies only if a soften-
ing unit is installed ahead of
the BWT PERMAQ
® Pro). If
the water hardness after a
softening plant is above than
0.5 °dH check the salt tank
and refill if necessary.
Every month:

Flushing of the membranes
must be done at least once a
week. Open valve V3 com-
pletely for half an hour while
the plant is operating. Then
adjust valve V3, so that the
concentrate flow becomes
20-30% again, see chapters
7.1 and 7.2
Biannually:

Check of pump. Follow the
manufacturer’s instructions.

Check pipelines and con-
nectors for leaks.

Check all pressure switches,
i.e. function and settings.
Note! If the plant needs to be
taken out of operation for a
long time, or there is a risk it
might be exposed to frost, each
membrane element must be
preserved.
How long the plant can be out
of operation before the mem-
branes need to be preserved,
depends on the intensity of the
organic growth. By surface
water the membranes must be
preserved at a standstill lasting
3 days or longer, and by
ground water the membranes
must be preserved at a standstill
lasting 7 days or longer.
For preservation, fill the mem-
branes with a following solution:
Mix
proportion
Preser-
vation
[%]
Frost
protection
[%]
Mono
Propylene
Glycole
- 20.0
Sodium-
bisulphite
1.0 1.0
For longer-lasting preservation
be aware of organic growth.
When frost-protecting you also
need to be aware that the pH-
value should never drop below
pH 3. In that case there will be a
risk that the bisulfite oxidises
into sulphuric acid.
Following must be checked
regularly:

The capacity has dropped by
more than 10% compared to
the value at start-up

The pressure after the high-
pressure pump has increased
compared to the value at
start-up

The conductivity has in-
creased (option) compared
to the value at start-up
If the plant operating conditions
and/or capacity change com-
pared to the start-up day, the
plant must be checked in prepa-
ration for a possible cleaning of
the membranes and/or adjust-
ment of the plant capacity.
For problem solving, see chap-
ter “9.2 Troubleshooting”.