REVERSE OSMOSIS SYSTEMS RO 4... /E /EL - INSTRUCTIONS MANUAL
s.r.l.Milano - ITALY
Page 15 of 25
ro4e_mi-r10.doc -
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5.3.2. External enabling signals
Whether automatic filters or softeners are installed upstream of RO system, the regeneration
of these units must stop the working of the RO system.
The auxiliary contact of the microswitch of programmers of Nobel filters and softeners is
operated on service and not on regeneration; hence if these contacts are connected to the
control board of RO, as explained at paragraph 4.6, during the regeneration the RO system
stops.
Concerning the connection of the external enabling, it is important to note the following :
¾
if one or more external enabling is connected on serial to clamps 9-10, the opening of the
contact stops immediately the RO unit, without running the end-cycle flushing (it is the
same to turn the mode selector on "RESET" position). This is the connection to be used
for standard serie equipments.
¾
if one or more external enabling is connected on parallel to clamps 9-12, the closing of
the contact stops the RO unit, and the end-cycle flushing runs (it is the same that
supplied water reach the max level). This is the connection to be preferably used for
equipments arranged to run the flushing using RO processed water (optional), by mean
of the inlet flushing solenoid valve
EIF
.
¾
for equipments arranged to run the flushing using RO processed water, it is also
possible to use both connections : for example the contacts of programmers on parallel
to clamps 9-12 to stop the unit with running flushing and an external enabling on serial to
clamps 9-10 to immediately stop.
The absence of the external enabling to clamps 9-10 is visualized by notice “NO EXTERNAL
ENABLING” on the display of the programmer.
The same notice appears also when the selector mode is on "MAN" or "RESET" position.
5.3.3. Hand-driven working
The system can also works out of the automatic commands of level, timer and pressure
switch, as hand-driven controlled. Just turn the selector on "MAN" position to work out of
automatic control.
5.3.4. Flushing
The feature of flushing is available; it allows to purge the membranes, by flushing high flow
rate water. This feature runs automatically according to pre-set time schedule, during the
current working of the pump
P
, by mean of the automatic opening of the special solenoid valve
EF.
Also, the flushing features automatically every time the treated water inside the storage tank
reaches the max. level, at the end of water supplying phase (end-cycle flushing). The times of
the flushing (during and at the end of working) are both adjustable, separately, by the
programmer as described above.
The solenoid valve
EF
can be also
hand-driven
opened, at any moment, by just pushing the
button "FLUSHING", available on the front of the control panel.
NOTE
: The end-cycle flushing
does not
feature if the stop of working is not caused by the
maximum level signal (but, for example turning the selector mode on "RESET").
