Controller Behavior
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Control Operation During Programming
The control will only enter the Program Mode with the valve in Service. While in the Program Mode, the control will
continue to operate normally, monitoring days and keeping all displays up to date. Control programming is stored in
memory permanently, eliminating the need for battery back-up power.
Time Clock Delayed Control
A Time Clock Delayed Control regenerates the system on a timed interval. The control will initiate a regeneration cycle at
the programmed regeneration time when the number of days since the last regeneration equals the regeneration day
override value.
Day of the Week Control
This control regenerates the system on a weekly schedule. The schedule is defined in Master Programming by setting
each day to either “off” or “on.” The control will initiates a regeneration cycle on days that have been set to “on” at the
specified regeneration time.
Control Operation During a Power Failure
The SXT includes integral power backup. In the event of power failure, the control shifts into a power-saving mode. The
control stops monitoring water usage, and the display and motor shut down, but it continues to keep track of the time and
day for a minimum of 48 hours.
The system configuration settings are stored in a non-volatile memory and are stored indefinitely with or without line power.
The Time of Day flashes when there has been a power failure. Press any button to stop the Time of Day from flashing.
If power fails while the unit is in regeneration, the control will save the current valve position before it shuts down. When
power is restored, the control will resume the regeneration cycle from the point where power failed. Note that if power fails
during a regeneration cycle, the valve will remain in it’s current position until power is restored. The valve system should
include all required safety components to prevent overflows resulting from a power failure during regeneration.
The control will not start a new regeneration cycle without line power. If the valve misses a scheduled regeneration due to
a power failure, it will queue a regeneration. Once power is restored, the control will initiate a regeneration cycle the next
time that the Time of Day equals the programmed regeneration time. Typically, this means that the valve will regenerate
one day after it was originally scheduled. If the treated water output is important and power interruptions are expected,
the system should be setup with a sufficient reserve capacity to compensate for regeneration delays.
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