Hydrotech 5600 SXT Valve nextSand Turbidity & Sediment Filter Operation Manual - Manual (Page 4)

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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 water usage and keeping all displays up to date. Control programming is stored in memory
permanently, eliminating the need for battery back-up power.
Meter Immediate Control
A meter immediate control measures water usage and regenerates the system as soon as the calculated system capacity is
depleted. The control calculates the system capacity by dividing the unit capacity (typically expressed in grains/unit volume)
by the feed water hardness and subtracting the reserve. Meter Immediate systems generally do not use a reserve volume.
However, in twin tank systems with soft-water regeneration, the reserve capacity should be set to the volume of water used
during regeneration to prevent hard water break-through. A Meter Immediate control will also start a regeneration cycle at the
programmed regeneration time if a number of days equal to the regeneration day override pass before water usage depletes
the calculated system capacity.
Meter Delayed Control
A Meter Delayed Control measures water usage and regenerates the system at the programmed regeneration time after
the calculated system capacity is depleted. As with Meter Immediate systems, the control calculates the system capacity by
dividing the unit capacity by the feed water hardness and subtracting the reserve. The reserve should be set to insure that
the system delivers treated water between the time the system capacity is depleted and the actual regeneration time. A Meter
Delayed control will also start a regeneration cycle at the programmed regeneration time if a number of days equal to the
regeneration day override pass before water usage depletes the calculated system capacity.
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.