Pentair FLECK 3900 NXT - Page 29

Installer Manual Fleck 3900 - NXT - System sizing
Ref. MKT-IM-015 / B - 08.06.2018 29 / 126
To calculate the system mass capacity:
To calculate the system combined capacity:
To calculate the system volume capacity:
V
capacity
= C
capacity
/ TH
inlet
Caution
If a mixing device is set on the valve before meter, TH = TH
INLET
- TH
OUTLET
.
Having determined the previous capacity allows the operator to know the service cycle duration.
170 58.5 5.85 3.27
200 62.7 6.27 3.5
230 66.9 6.69 3.74
260 71 7.1 3.97
290 75.3 7.53 4.21
M
capacity
= V
resin
x C
resin ex
with:
M
capacity
: system mass capacity [g as CaCO
3
]
V
resin
: volume of resin [L]
C
resin ex
: resin exchange capacity [g/L
resin
as CaCO
3
]
C
capacity
= V
resin
x C
cor resin ex
with:
C
capacity
: system combined capacity [°f.m
3
or °dH.m
3
]
V
resin
: volume of resin [L]
C
cor resin ex
: corresponding resin exchange 
capacity [°f.m
3
/l or °dH.m
3
/l]
V
capacity
= M
capacity
/ TH
inlet
or
with:
V
capacity
: system volume capacity [m
3
]
M
capacity
: system mass capacity [g as CaCO
3
]
C
capacity
: system combined capacity [°f.m
3
or °dH.m
3
]
TH
inlet
: inlet water hardness [mg/L as CaCO
3
or °f or °dH]
Salt amount
[g/L
resin
]
Corresponding resin exchange
capacity in [g/L
resin
] as CaCO
3
°f.m
3
[per L
resin
]
°dH.m
3
[per L
resin
]