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13
Automatic Regeneration
There are two ways to have the control automatically
start a regeneration: calendar override or having the
control monitor the water usage.
Calendar override
This feature is set in Parameter P14. It can be set for
one to 30 days. If it is set to zero, this feature is
disabled. When this feature is active, the control keeps
track of the number of days since the last regeneration
and when that number equals the value set in P14, a
regeneration is automatically started at the Time of
Regeneration set in P2.
Control monitors the water usage
The control compares the water usage to the
calculated volume capacity of the system. The control
uses the Capacity Parameter P5 divided by the
Hardness Parameter P3 to calculate the volume
capacity of the system. It also uses a reserve value to
determine if a regeneration is necessary. If the water
usage since the last regeneration is greater than the
system capacity minus the reserve, a regeneration is
needed.
Note:
If the water usage exceeds 150% of the system
capacity between regenerations, the control will
automatically call for a second regeneration the next
day even if no water is used. This feature is included to
make sure that an exhausted resin bed is completely
recharged.
Reserve options
There are two types of reserve options for this control:
fixed reserve and historical water usage pattern. They
are selected with Parameter P15.
Fixed reserve
When the fixed reserve is selected, the control
multiplies the maximum system capacity by the
percent value set in Parameter P16 and uses the result
as a reserve.
Water usage pattern
The other reserve option allows the control to adjust the
reserve based upon the historical water usage pattern
of the system. The control keeps track of the water
usage for each day of the week and uses that day’s
average usage multiplied by 1.2 as the reserve for that
day. Every day at the Time of Regeneration, the control
recalculates the day’s average water usage. If less than
10% of a day’s average water usage is used, the
control will not change the day’s average. If more than
twice the day’s average is used, the control uses the
actual usage in the reserve calculation.
Since a new installation has no history of water usage,
the control multiplies the percent of capacity value set
in Parameter P16 by the total system capacity to
determine starting average for each day of the week.
The factory set default value for P16 is 30 which means
that 30% of the total system capacity is used for the
starting average for each day.
Program Parameter P15 is also used to select whether
the control waits until the Time of Regeneration set in
Parameter P2 to start a regeneration, or if the control
should begin a regeneration immediately when the
capacity remaining is less than the reserve.