System Sizing; Recommendations; Injector/Dlfc/Blfc-Valve Configuration; Sizing A Softener (Single Unit) - Pentair FLECK 3150 NXT Installer Manual

4

System sizing

4.1

Recommendations

4.1.1

Injector/DLFC/BLFC-Valve configuration

Brine Tank
syst. Diameter
3150/
1800
4.2

Sizing a softener (single unit)

4.2.1

Parameters to be considered

Whenever installing a softener, it is preferable to have full water analysis to ensure the
inlet water content will not affect the resin bed.
Info
Please consult your resin manufacturer specifications to ensure that no additional
pretreatment prior to softening is required.
The below sizing method can be applied for both residential and industrial softeners.
The sizing of a softener must be based upon certain parameters:
• inlet water hardness;
• peak flow rate and nominal flow rate;
• service velocity;
• salt dosage.
The softening and regeneration reactions are driven under certain conditions. To allow
these reactions to take place, make sure that the velocity is convenient during the
different phases for proper ion exchange. This velocity is given in the resin
manufacturer specifications sheet.
Depending on the inlet water hardness, the service velocity for standard softening must
be between:
Ref. MKT-IM-010 / C - 18.10.2019
Resin
volume
[in] L DF
24 283 - 424 4
30 284 - 425 5
36 426 - 605 6
42 566 - 850 7
48 851 - 8
1200
54 1201 - 9
1550
60 1551 - 10
2000
Installer manual Fleck 3150 NXT/NXT2 - System sizing
Injector
Color UF Color
Green 4 Green
Red
White 5 Red
Blue 6 White
Yellow 7 Blue
Purple 8 Yellow
Black
DLFC BLFC
[gpm] DF
[gpm] [gpm]
20.0 5.0
25.0
35.0
50.0 10.0 10.0
70.0
80.0
100.0
27 / 182
UF
5.0