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Installer Manual Fleck 5810 - XTR - System sizing
4.2.5. Cycle time calculation
From this point, the volume of resin, the tank size, the capacity of the softener and the valve
configuration are determined. Next step is to calculate the regeneration cycle duration, which
depends on the valve configuration and once again on the resin specifications.
Note
Preprogrammed cycle times are only factory default programming that need to be adjusted
to fit the system requirements.
For cycle time calculation the valve configuration must be known, which depends on:
•
the tank size;
•
the resin specifications for the velocity for backwashing the resin bed;
•
the velocity of water for brine draw, slow rinse and fast rinse.
Further information needed for cycle time calculation are:
•
the resin volume previously determined;
•
the salt amount used per regeneration;
•
the volume of water to use for backwash, brine draw, slow rinse and fast rinse.
To calculate the backwash duration:
T
= (N
x BV) / Q
backwash
BVbw
Note
The typical value of the volume of water to be used for backwash is between 1.5 and 4 times
the bed volume, depending on the inlet water quality.
34 / 124
DLFC
with:
T
: backwash duration [min]
backwash
N
: number of bed volume for backwash
BVbw
BV: bed volume [L]
Q
: drain line flow controller size [L/min]
DLFC
Ref. MKT-IM-018 / C - 08.06.2018
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