AUTOMATIC FILTERS INSTRUCTIONS MANUAL
FC/D - FAC/D
s.r.l.Milano - ITALY
Page 10 of 14
p11.02-v34.f fcd_mi-r1.doc
5. End cycle and regeneration
5.1. End cycle
The adjustment of the end cycle depends on the quantity of suspended solids the water
contains.
Take note of the parameters to be taken in consideration, as below listed, since a correct
adjustment can be made only checking the real operating conditions.
The end of a cycle is reached when the pressure drop across the filter is approx. 0.8÷1.0 bar
(80÷100 kPa). After checked after how long time the max allowable pressure drop is reached, it
is possible to adjust the time schedule of the regeneration definitely.
The filters are equipped with an electronic time programmer that allows to schedule the
automatic regeneration: it starts at selected time and day (24 h, 7 days).
5.2. Regeneration
The regeneration is automatically controlled; it can also be started manually, at any time.
The manual start of a regeneration can be made by a proper sequence of pushing the
buttons 1 and 2 placed on the programmer, in order to act the relays of the channels 1 and 2.
During the operation, the power must be ON.
When the regeneration, manually started, is completed, the unit will go on to work according
to the pre-set schedule.
The regeneration can also run in case of power failure, by hand-driving the lever of the pilot
solenoyd valves: the solenoyd valve is closed when the lever is on parallel to the base and it is
open when it is on perpendicular to the base itself. Naturally, the compressed air supplying (air
controlled valves) or pilot water supplying (water controlled valves) must be assured.
The correspondent membrane valves (controlled by the pilot solenoyd ones), if NC type is
open when the solenoyd valve is open, and viceversa if the membrane valve is NO type.
PHASE SOLENOYD VALVES
EXCITED (=OPEN)
OPEN VALVES
SERVICE // V2 - V4
BACKWASHING E2 - E3 V3 - V5
RINSE E1 - E2 V1 - V4
The regeneration phases run one after another, as follows :
1.
Backwash :
during this phase, the water flushes from the bottom to the top of the column,
lifting the filtering media and releasing the solids trapped on its surface during the service.
The backwashing water flows to drain from the top of the column. This is the only phase,
during which the water crosses through the column from the bottom to the top.
2.
Rinse :
it is the phase during which the filtering media are rinsed; at the end of this phase
the column is ready to start again a new service cycle.
NOTE: During regeneration the water supplying is completely inhibited by means of a
membrane valve mounted on the outlet line.
