33
ENG
Maintenance
WTS LARGE +0300131IT rel. 1.0 - 05.09.2022
The CB-EC cartridge needs to be replaced:
• every four months if the chlorine content in the feed water is less than 0.1 ppm.
• every two months if the chlorine content in the feed water is between 0.1 ppm and 0.2 ppm.
The CPP micron filter (J) traps impurities around 5 µm in size. The filter works mechanically, letting the feed water fl
ow through a filtering mesh. It is normal for the filter to become blocked over time, letting less water through and
increasing the pressure drop.
The CPP cartridge needs to be replaced when the system feed water pressure (after having passed through the inlet
filter car- tridges) is less than 1 bar during normal oper- ation (pressure read on pressure gauge PI01).
Before replacing the prefilter, check
• that the ROL system is switched o
• the inlet valve is closed and there is no pressure on the water line.
» Remove the pre-filter with suitable tools.
» Remove the old filter cartridge and clean the inlet.
» Replace the O-ring if necessary.
» Moisten the new O-ring and insert it.
» Insert a new filter cartridge.
» Mount the pre-filter with suitable tools.
» Open the water supply and vent the filters via the screw in the upper part of the membrane container.
9.3.2 Filling of the antiscalant canister
The appropriately dosed antiscalant prevents lime deposits on the membranes. The filling level of the antiscalant
canister must be con- stantly monitored. The consumption of the antiscalant mixture depends on the permeate
production and the settings of the dosing pump.The reverse osmosis plant cannot work without antiscalant or
softening, because oth- erwise the membranes would be irreversibly damaged. For this reason, the electronic con- trol
stops operation and activates an alarm as soon as it recognizes a low level in the anti- scalant canister. To prevent this
alarm and the following production stop, check the filling level of the canister regularly and refill it in time.
9.3.3 Replacing the UV lamp
The UV lamp has a limited operating life. The following intervals are recommended for replacement (whichever comes
first):
• 9000 operating hours
• one year
9.3.4 Reset maintenance counter
Reset the maintenance hour counter in menu item 13 as described in the chapter device control.
9.4 Special maintenance and repairs
9.4.1 Membrane exchange
The membranes undergo a natural decline in performance over time, specifically:
• annual reduction in water produced of 7%
• annual increase in outlet water conduc- tivity of 10%
After a certain period of operation, in relation to the characteristics and volume of water treated, the membranes tend
to become blocked, with a decline in efficiency. This decline in membrane efficiency may depend on two main factors:
• blockage due to precipitation of iron or calcium sulphate and carbonate
• biological blockage
• infrequent replacement of the CBC (carbon block fi lter)
Replacement becomes necessary when the system shows variations in the following fun- damental parameters (for the
same initial feed water temperature):
• decrease in water produced to a level that is insufficient for the application connected downstream of the
reverse osmosis system.
• excessive increase in the conductivity of the water produced to a level that is excessive for the application
connected downstream of the reverse osmosis system.
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