Variable Refill Function - Pentair FOLEO 5800 XTR Installer Manual

The service and regeneration reaction can be done over and over, so softening systems last years.
A softener consists of different components:
• a tank, filled with softening resin;
• a valve, that will direct the inlet water flow on the resin bed so that the softening or regeneration
reaction can take place;
• a timer, that will control when the regeneration phases have to be done;
• a brine tank, where saturated brine solution is prepared for the regenerations.
The present softener will simply allow the previously described reaction to happen, alternating
softening period of few days with regeneration that may last up to few hours depending on setting
done. The softener is equipped with a controller that will trigger automatically the different phases of
service and regeneration upon the programming done.
The valve configuration has been chosen to be in accordance with the volume of resin contained in the
tank. Do not intend to modify it or you may cause kinetics changes and may cause regeneration
malfunction.
In order to ensure proper softener function, make sure it always contains salt in the brine tank and
remains electrically powered. Softener installation, start up and programming must be done by
trained professional water treatment specialist. Incorrect installation or wrong programming may
cause softener malfunctions or even damage the softener and its components.
Respect programming recommendations for each softener size in order to achieve best optimized
softener performances.
Softener requires periodical cleaning/maintenance operations to ensure proper function over years.
Those are described in the present manual on chapter 8. Maintenance, page 72.

3.1.2. Variable refill function

The Foleo softener series is designed to feature a variable refill for each regeneration. This is meant
to optimize the salt consumption of the water softener and allow yearly salt savings up to 30%
average* for the same volume of softened water therefore reducing the cost as well as the
environmental impact of discharging salt to the drain.
How does this work:
The Foleo series feature volumetric delayed regeneration, with variable reserve meaning that the
controller will plan the regeneration before complete capacity depletion based on registered water
usage. Therefore when the regeneration is initiated, the capacity is actually not totally depleted. The
XTR controller will take into account the capacity that was really used and will refill the brine tank so
that only what has been used for real is regenerated. The refill time is automatically calculated by the
controller at each regeneration, using the BLFC rate programmed in the electronic (0.5 gpm for
Foleo).
After the variable refill is performed, the softener will return to service for the programmed duration
of the Pause cycle (0-240 min). This time is used to allow refilled water to dissolve salt and become
saturated brine. Be sure to program a sufficient duration according to your local conditions and salt
type.
For best performance prefer to set up a regeneration time where there is low to no water
consumption.
Ref. MKT-IM-038 / C - 15.11.2019
Installer Manual Foleo - Description
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