Pentair FLECK 3900 NXT - Inlet Water Hardness; Regeneration Days Override; Regeneration Start Time

Installer Manual Fleck 3900 - NXT - Programming
Ref. MKT-IM-015 / B - 08.06.2018 59 / 126
6.4.2. Inlet water hardness
Set the input water hardness in the unit defined on chapter 6.5.11. Display format, page 67.
6.4.3. Regeneration days override
Set the maximum number of days that the valve is in service without regenerating, regardless from
the volume of water used.
Note
For a timeclock valve, this value must be set. For metered valves, it is regenerated once the
amount of days is reached at a preset time unless the meter triggers regeneration before.
Calendar override initiate regeneration only if no regeneration has been initiated within the
delay programmed in calendar override parameter.
6.4.4. Regeneration start time
Set the time for regeneration start.
Mandatory
It must be set when the valve is in timeclock mode or with a metered calendar override.
B Select the language to be displayed with and .
C Press to validate the selection and advance to the next
parameter.
D Set the inlet water hardness with , and .
E Press to validate the selection and advance to the next
parameter.
FEED WATER
HARDNESS:0030mgL
F Adjust the number of days with , and .
G Press to validate the selection and advance to the next
parameter.
→ Can be adjusted from:
1 to 99 days for timeclock regeneration;
OFF to 99 days for metered regeneration.
Without calendar forcing.
REGENERATION DAY
OVERRIDE:OFF
Forcing every 3 days.
REGENERATION DAY
OVERRIDE:03DAYS
H Adjust the time of regeneration with , and .
I Press to validate the selection and return to service.
Regeneration at 2:00 am.
REGENERATION 
TIME 02:00HR