Installer manual Fleck 4600 MECH - System sizing
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Ref. MKT-IM-027 / C - 12.11.2019
The DLFC installed on the valve has to limit the backwash flow rate to the above calculated flow
rate.
To determine the injector size:
The velocities to be respected for brine draw and slow rinse are given on the resin manufacturer
specifications. Generally speaking, the injector has to allow a flow rate of about 4BV / h
(corresponding to the flow rate of brine being drawn added to the flow rate of raw water passing
through the injector nozzle to create the suction effect).
Q
Inj
= 4 x BV / h
with:
Q
inj
: total flow rate passing through the injector [L/h]
BV: bed volume of resin [L]
Info
This value does not correspond to the brine draw flow rate but to the total flow rate
passing through the injector.
Refer to the injector diagrams at the inlet pressure in order to check if the injector will
give a correct flow rate.
See chapters Salt amount definition [
Page 30] and Injector flow rates [
4.2.5
Cycle time calculation
Info
The mechanical controller uses fixed times.
4.3
Salt amount definition
The salt settings are controlled through the controller programming. See Resin exchange capacity
and capacity of the unit [
4.4
Injector flow rates
The following tables and graphics represent the injectors flow rate as a function of the inlet
pressure for the different injector sizes.
