Nobel RO 809 /E Instruction Manual
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Contents
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REVERSE OSMOSIS SYSTEMS RO 809-812-815/E - INSTRUCTIONS MANUALs.r.l.Milano - ITALY Page 15 of 25 ro809-812-815_mi-r0.doc - r. 05.3.2. External enabling signalsWhether automatic filters or softeners are installed upstream of RO system, the regenerationof these units must stop the working of the pump of RO system.The contacts of the microswitch of programmers of Nobel filters and softeners is closed onlyduring the service; hence only during the service of filters and softeners the RO system canwork and supply water.The visualization of notice “NO external enabling signal” indicates that there is not anyenabling signal.The same notice appears also when the selector mode is on "MAN" position.5.3.3. Hand-driven workingThe system can also works out of the automatic commands of level, timer and pressureswitch, as hand-driven controlled. Just turn the selector on "MAN" position to work out ofautomatic control.5.3.4. FlushingThe feature of flushing is available; It allows to purge the membranes, by flushing high flowrate water. This feature runs automatically according to pre-set time schedule, during thecurrent working of the pump P, by automatically opening the special solenoid valve EF.Also, the flushing features automatically every time the treated water inside the storage tankreaches the max. level, at the end of water supplying phase (end-cycle flushing). The times ofthe flushing features (during and at the end of working) are both adjustable, separately, by theprogrammer as described above.The solenoid valve EF can be also hand-driven opened, at any moment, by just pushing thebutton "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 themaximum level signal (but, for example turning the selector mode on "RESET").5.3.5. ConductivityWater conductivity is rough related to its salinity. Since conductivity value is easilymeasurable, it is normally used to gives an indication, even if approximate, of the efficiency ofthe system.The conductimeter COND, on the front of the control panel, continuously meters andvisualizes the conductivity of treated water (permeate).When the conductivity of treated water is higher than the set-point, the alarm "highconductivity" acts. The factory set point is 40 μS/cm , and it is adjustable by the screw placedside of the K1 set-point button.The alarm of high conductivity water has not any influence on working of the system.5.3.6. Minimum pressureA pressure switch PC is installed upstream of the high pressure pump P.It acts when the pressure of the water in that point is less than 0.8 bar (80 kPa). It can bealso caused by non-opening of the inlet valve VI. It drives the low-pressure alarm, few secondsdelayed, and stops the working of the high pressure pump P; the inlet valve VI, instead, remainsopen.The alarm and the block can be re-set only turning, even momentarily, the modeselector on " RESET". |
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