Hydrotech SXT Timer - Manual (Page 3)

TIMER OPERATION
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 feedwater 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 feedwater 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 Regeneration
During regeneration, the control displays a special
regeneration display. In this display, the control shows the
current regeneration step number the valve is advancing to,
or has reached, and the time remaining in that step. The step
number that displays flashes until the valve completes driving
to this regeneration step position. Once all regeneration steps
are complete the valve returns to service and resumes normal
operation.
Pressing the Extra Cycle button during a regeneration cycle
immediately advances the valve to the next cycle step position
and resumes normal step timing.
Control Operation During Programming
The control only enters the Program Mode with the valve in
service. While in the Program Mode, the control continues
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 backup power.
Manually Initiating a Regeneration
1. When timer is in service, press the Extra Cycle button for 5
seconds on the main screen.
2. The timer advances to Regeneration Cycle Step #1 (rapid
rinse), and begins programmed time count down.
3. Press the Extra Cycle button once to advance valve to
Regeneration Cycle Step #2 (backwash).
4. Press the Extra Cycle button once to advance valve to
Regeneration Cycle Step #3 (brine draw & slow rinse).
5. Press the Extra Cycle button once to advance valve to
Regeneration Cycle Step #4 (brine refill).
6. Press the Extra Cycle button once more to advance the
valve back to in service.
NOTE: If the unit is a filter or upflow, the cycle step
order may change.
NOTE: A queued regeneration can be initiated by
pressing the Extra Cycle button. To clear a
queued regeneration, press the Extra Cycle
button again to cancel. If regeneration occurs
for any reason prior to the delayed regeneration
time, the manual regeneration request shall be
cleared.
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.
Fleck SXT Timer JL10 • 3