Inhibit Of The Regeneration; Inhibition Of The Water Supply - Nobel FCD 05 Instruction Manual

The regeneration can also run in case of power failure, by hand-driving the lever of the pilot
solenoid valves: the solenoid 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 solenoid ones), if NC type is
open when the solenoid valve is open, and viceversa if the membrane valve is NO type.
PHASE
SERVICE
BACKWASHING
RINSE
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.
NOTE : For -DUAL arrangements, when regeneration is required, column A starts it
immediately, while in the same time column B enters in "regeneration
required"state, although it continues to feed water.
At the end of regeneration of column A, with an adjustable delay (see
following how to adjust time of delay), column B starts regeneration.
5.4.

Inhibit of the regeneration

It is possibile to inhibit the automatic starting of regeneration by mean of an external contact,
using the input I2 of the programmer as described at paragraph "Electrical wiring connection".
Hence, when the end-cycle is reached, the filter will remain on REGENERATION
REQUIRED until the inhibit signal is switched off.
Even if the inhibit signal is still on, it is also possible to start manually the regeneration, as
above explained.
5.5.

Inhibition of the water supply

It is possibile to inhibit the water supply during the service by mean of an external contact,
using the input I6 of the programmer as described at paragraph "Electrical wiring connection".
Hence the filter will not be able to supply water until the inhibit signal is switched off.

s.r.l.Milano - ITALY
INSTRUCTIONS MANUAL AUTOMATIC FILTERS
SOLENOID VALVES
EXCITED (=OPEN)
//
E2 - E3
E1 - E2
Page 13 of 23
FCD-FACD-FFD /DT /DP /DT-DUAL /DP-DUAL
OPEN VALVES
V2 - V4
V3 - V5
V1 - V4
fcd-dp_mi-r4.doc –
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