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 18 of 25 ro809-812-815_mi-r0.doc - r. 06. Starting-up and adjustmentsAt the starting-up of the system, when the system is re-started after a long non-workingperiod, and after a cleaning operation, the membranes are filled with preservative or detergentchemical.Hence, in any cases, it is required to remove completely the preservative or detergent fromthe membranes before that treated water can be used.The operations are made as follows : (see "DIAGRAM OF THE SYSTEM")• be sure that the power switch of power control panel QE is OFF (main switch on “0”)• connect temporarily the auxiliary fitting R to the drain• divert, temporarily also the permeate line to thedrain, by turning the 3-way valve V3 on cleaningposition, (the direction of the flow towards the fittingR, check the direction with the symbol marked on thelever of 3-ways valves).• close completely the needle regulation valve VR• open completely the needle regulation valve VS• open slowly the water inlet valve of the system. In order to make easy the filling of thefilter F, open slowly the valve placed on the top side of the filter• switch ON the main power of QE control board (turning on "1" position), and switch themode selector of the pump on "MAN" position; the RO unit will start to work.• after several minutes of working (check carefully that there is required minimumpressure of water inlet, by the pressure gauges M1 and M2: the minimum pressurecontrol is out of working when the mode selector is on “MAN” position), the serviceflow rates can be checked and adjusted.• adjust the needle valve VS, mounted along the the drain line of the membranes, in orderthat the flow rate of permeate (flow meter F1) meets the technical data of the system. Thevalue of pressure shown on pressure gauge M4, after the adjustment of VS valve, is thenormal working pressure of the system according to the available raw water quality(chemical composition, temperature, etc.)An adjustable recirculating system is available in order to reduce the quantity ofconcentrated (drain) water and/or reduce the working pressure; proceed as follows :• adjust the needle valve VR to recirculate part of concentrated water in order to reduce theflow rate of water actually carried to drain. The adjustment of the valve VR causes alsothe modification of the working pressure, hence a new adjustment of valve VS is required,until both values pressure/flow rate are the ones desired.• The valve VRP, mounted downstream of the pump P, allows to throttle the forcing line ofthe pump, in order to allow to reduce both the pressure and the flow rate on membranes.This feature can be useful for the system to run at low pressure, without recirculationg ordraining a too high flow of water.A “too high flow” means the one that causes a pressure drop, across the membranes,over than 3 bars (300 kPa) for each housing (difference of pressure between M3-M5 andM5-M4).This needing happens more often with new membranes, when they produce the max flow. |
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