11
Regeneration
When the control begins a regeneration, the display will
alternate between Time of Day and Regen Time
Remaining. The Regen Time Remaining is shown in
minutes. The control will start and stop an internal
motor which drives the cam gear through the various
backwash positions. The control uses the information
entered in the parameters shown in Table 2 to
determine how long each part of the cycle should last.
If power fails during a regeneration cycle, the cycle
completes normally when the power is restored.
Note: The REGEN button is only active when the
display is alternating between Time of Day and
Capacity. When programming Level I or II parameters,
the REGEN button is not active.
The Regen Time Remaining will continue to count
down until the cam gear reaches the Service position.
Manual Regeneration
To initiate a manual regeneration, press the REGEN
button. This button is located on the front of the control.
When you press the REGEN button, the control
performs a full regeneration of the filter.
If you press this button again more than one minute
after regeneration begins, but before the
regeneration is complete, a second regeneration
will start when the first regeneration is finished. The
display will freeze and only show the Regen Time
Remaining as an indication that the second
regeneration will be performed. When the first
regeneration is complete, the second one will begin
and the display will alternate between Time of Day and
Regen Time Remaining.
Automatic Regeneration
There are two ways to have the control automatically
initiate a regeneration: calendar override or normal
metered water usage.
Calendar Override
This feature is set in parameter P14. It can be set for 1
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 backwash and when
that number equals the value set in P14, a backwash is
automatically started at the Time of Backwash set in
P2.
Normal Metered Water Usage
The control compares the water usage to the
calculated volume capacity of the system. The control
uses the Capacity parameter P5 and the Factor A
parameter P3 to calculate the volume capacity of the
system. It also uses a reserve value to determine if a
backwash is necessary. If the water usage since the
last backwash is greater than the system capacity
minus the reserve, a backwash is needed.
Note: If the water usage exceeds 150% of the system
capacity between backwashes, the control will
automatically call for a second backwash the next day
even if no water used.
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 Backwash, 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 Backwash set in
parameter P2 to start a backwash, or if the control
should begin a backwash immediately when the
capacity remaining is less than the reserve.
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