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USE AND INSTALLATION MANUAL
3. MACHINE DESCRIPTION
3.1. COLD WATER OPERATING LOGIC
The softeners fitted with a Logix control valve have nine operating cycles. The softening system consists of two
control valves, two cylinders containing strong cation resin in sodium cycle, connected to one another to form a
continually flowing system which operates with a duplex alternator logic and of two brine vats on a separate brine
system skid. During the service cycle, the water hardness is trapped on the resin bed and exchanged with sodium
salts. When the exchange capacity finishes, the system regenerates a single column while the other stays in
service to guarantee that softened water is always available. When the regeneration has finished, the first column
stops in a specific phase whilst waiting for the one in service to terminate. The entire system is controlled by a
water meter which controls the work cycles
1
C0
Treated water position
The untreated water is directed in a concurrent flow through the resin bed while the calcium ions are
exchanged by the resin and replaced by non-scaling sodium ions.
CAUTION
Unlike single softeners, the ECOTWIN models feature regeneration which is interrupted after
the C4 phase, while waiting for the exchange capacity of the cylinder in service is terminated.
Just before cylinder 1 runs out, cylinder 2 moves from the waiting phase to the operating
phase, performing the regenerative phases C5, C6, C7, C8.
Once cylinder 2 starts operating, cylinder 1 starts the regeneration, performing phases C1,
C2, C3, C4. The regeneration of cylinder 1 then stops in the waiting phase until cylinder 2
has almost run out. Then, cylinder 1 completes its regeneration cycle and starts operating
while cylinder 2 performs half the regeneration cycle.
Cylinder in waiting phase
C5 Quick rinse 1
C6 Backwash 2 (255 only)
C7 Quick rinse 2 (255 only)
C8 Brine replacement
The regeneration process consists of:
2
C1
Backwash position 1
The water flow is reversed by the backwash valve in the rise pipe and rises back up from the bottom of
the cylinder. During this cycle, the bed expands and the calcium ions are flushed into the drain.
3
C2
Extraction position
The water flows through the injector and the brine is extracted from the vat. The brine is sent upwards
through the resin and to the drain.
The calcium ions are replaced by sodium ions and thus, eliminated via the drain. The cycle is completed
when the air check closes.
4
C3
Slow rinse position
The water flows slowly through the resin and rises up via the central pipe, flowing towards the drain rinsing
the residual brine.
Waiting
Cylinder in operating phase
Service
C1 Backwash 1
C2 Extraction position
C3 Slow rinse
C4 Repressurization
25
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