Parallel Systems - Pentair Autotrol 255 Installer Manual

Installer Manual 255/LOGIX 742-762-764 - Operation

8.5.2. Parallel systems

Parameter P16 is used to determine the method for demanded initiated regeneration. Four
regeneration modes are possible:
• P16 = 0, delayed regeneration with a variable reserve:
Regenerations will start only at the time of regeneration entered in P3. A tank is regenerated if the
remaining capacity in that tank is below the minimum required capacity needed to meet the next days
calculated water usage requirement. The next days water usage number is based on the daily average
water usage held in memory plus a 20% reserve. If necessary both tanks will be regenerated
sequentially beginning with the most exhausted tank. This option allows the controller to vary the
reserve, and therefore the decision to regenerate, based on the actual daily water usage pattern for
the location at which it is installed (see table below);
Priority
High
Average
Low
Table with P16 = 0
• P16 = 1, delayed regeneration with a fixed reserve:
Regenerations will start only at the time of regeneration entered in P3. A tank is regenerated if the
remaining capacity in that tank is below the percentage entered in P17. If either tank's capacity is
overrun by 50% a regeneration will take place. The controller will also cause both tanks to be
regenerated sequentially the next time of regeneration regardless of how much water is used during
that 24 hours period. This feature helps to recover a severely exhausted bed (see table below);
Priority
High
Average
Low
Table with P16 = 1
64 / 92
Flow rate Continuous soft water
x
Flow rate Continuous soft water
x
Efficiency
x
Efficiency
x
Ref. MKT-IM-021 / A - 20.02.2019
x
x