Brine Refill - Cycle - Pentair Siata V132 SFE Installer Manual

Installer manual Siata V132 - SFE - System sizing
To calculate slow rinse duration:
The volume of water to be used for slow rinse is given in the resin manufacturers specifications.
Generally speaking, it is advised that between 2 and 4 BV of water is used to perform the slow rinse
after brine draw. The slow rinse cycle allows brine to be pushed slowly through the resin bed, allowing
the resin to be in contact with brine for sufficient time and therefore to be regenerated.
Refer to the injector curve at the common working pressure to determine the slow rinse duration.
T = (N x BV) / Q
slow_rinse BV
To calculate fast rinse duration:
The fast rinse is aimed at eliminating an excess of salt in the resin bed and also recompacting the
resin in the tank.
Depending on the valve type, the fast rinse flow rate is controlled by the DLFC or it has about the same
flow rate as in service. The fast rinse velocity can be the same as the service velocity, and the volume
of water to be used for the fast rinse is generally between 1 and 10 BV depending on the salt dosage.
T = (N x BV) / Q
fast_rinse BV

4.2.6. Brine refill - cycle

After fast rinse cycle, water is directed to the brine tank at the rate of the safety brine valve to create
brine for the next regeneration. But the brine refill cycle is not performed by the controller (this step
is not included in the programmed cycles).
Example of configuration :
• Safety brine valve rate: 1l/min;
• With a 50L softening;
• With a salt setting of 150 g/L for regeneration.
Calculate the amount of water and salt required:
(150 x 100)/1000 = 15kg of salt;
15/0.375 = 40L of water.
Fill the brine tank to the AC level.
Put 40 liters of water and at least 15 kg of salt in the brine tank.
Use a pencil to mark the level of mixed water and salt in the brine tank and set the floater to that level.
See "Block diagram and configuration example", page 36.
A
Note
Please also refer to chapter "Start up procedure", page 52 for additional information.
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SR
DLFC
with:
T : slow rinse duration [min]
slow_rinse
N : number of BV
BV
BV: bed volume [L]
Q : injector slow rinse flow rate [L/min]
SR
with:
T : fast rinse duration [min]
fast_rinse
N : number of BV
BV
BV: bed volume [L]
Q : drain line flow [L/min]
DLFC
Ref. MKT-IM-003 / B - 19.04.2017