Pentair Autotrol 255 Installer Manual page 23

Refill first option: on, Pr=1
The refill first option has been designed mainly for twin parallel systems using only one brine tank. It
allows a minimum time of 2 hours for brine to be saturated.
Tank 1 and tank 2 are both in service position. Depending on the residual capacity, tank 1 or tank 2 will
initiate first a regeneration.
In this example tank 1 moves from service position to C8 and then comes back in the service position
for 2 hours. "C0" will then be displayed. After this delay the valve will then regenerate normally but
skipping the C8 cycle since the refill will be done first at the next regeneration.
Tank 2 will not initiate a regeneration while tank 1 is not back in service.
Initiate again a regeneration, this time tank 2 will move through the cycles whereas tank 1 stay in
service.
C1
C2
C3
C4
Ref. MKT-IM-021 / A - 20.02.2019
Tank 1
Service
Installer Manual 255/LOGIX 742-762-764 - Description
2 hours
C8
C7
C6
C5
Tank 2
Service
Tank 2 will not initiate a
regeneration while tank 1 is
not back in service
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