Valve Configuration - Pentair FLECK 5800 SXT Installer Manual

To calculate the system volume capacity:
V = M / TH
capacity capacity
or
V = C / TH
capacity capacity
Caution
If M must be expressed in [kg] the value must be divided by 1000.
capacity
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 = Fs
backwash backwash
The DLFC installed on the valve has to limit the backwash flow rate to the above calculated flow rate.
Ref. MKT-IM-004 / A - 18.04.2017
with:
inlet
V
capacity
M
capacity
C
capacity
TH
inlet
inlet
x S
Installer Manual Fleck 5800 - SXT - System sizing
: system volume capacity [m
: system mass capacity [kg as CaCO
: system combined capacity [°f.m
: inlet water hardness [mg/L as CaCO3] or [°f or °dH]
with:
Q : backwash flow rate [m
backwash
Fs : backwash velocity [m/h]
backwash
S :Tank cross section area [m
3
]
3
] or [°f.m or °dH.m
3
3 3
or °dH.m ]
3
/h]
2
]
3
]
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