Pentair FLECK 5800 SXT - Valve Configuration

Installer Manual Fleck 5800 - SXT - System sizing
Ref. MKT-IM-004 / A - 18.04.2017 29 / 92
To calculate the system volume capacity:
V
capacity
= M
capacity
/ TH
inlet
or
V
capacity
= C
capacity
/ TH
inlet
Caution
If M
capacity
must be expressed in [kg] the value must be divided by 1000.
Caution
If a mixing device is set on the valve, the inlet water hardness will need to be adjusted to the
actual outlet residual hardness setup.
Having determined the previous capacity allows the operator to know the service cycle duration.
4.2.4. Valve configuration
Knowing the volume of resin, tank size and specifications of the resin, it is possible to determine the
required valve configuration. The resin specification will give the backwash velocity, as well as the
brine draw and slow rinse velocity that must be respected in order to ensure a proper regeneration of
the unit. From this data, determine the required backwash flow rate as well as the brine draw and
service flow rate. In most cases, the fast rinse flow rate will be the same as the backwash flow rate,
however for certain valve types the fast rinse flow rate will be the same as the service flow rate.
To determine the backwash flow rate:
Q
backwash
= Fs
backwash
x S
The DLFC installed on the valve has to limit the backwash flow rate to the above calculated flow rate.
with:
V
capacity
: system volume capacity [m
3
]
M
capacity
: system mass capacity [kg as CaCO
3
] or [°f.m
3
or °dH.m
3
]
C
capacity
: system combined capacity [°f.m
3
or °dH.m
3
]
TH
inlet
: inlet water hardness [mg/L as CaCO3] or [°f or °dH]
with:
Q
backwash
: backwash flow rate [m
3
/h]
Fs
backwash
: backwash velocity [m/h]
S :Tank
cross section area
[m
2
]