Watts Autotrol 263 / 268 (Logix Series) - Manual (Page 40)

40 PROGRAMMING THE 700 FOR 5-CYCLE FILTER APPLICA-
TIONS
PROGRAMMING THE 700 FOR 5-CYCLE FILTER APPLICATIONS
Manganese Greensand Systems
Sizing FA Filters
Potassium permanganate regenerating iron filters should be sized for the
appropriate backwash and injector sizes.
Backwash Controller
Be sure to choose the appropriate backwash flow rate control (see Parts
section) as recommended by your media manufacturer.
Injector
Use the same injector size as you would for your conditioner control tank
diameter.
Refill Controller
A FA filter can use the 0.33 gpm refill control that is featured as standard
with a Logix controller. Use a check valve in your potassium
permanganate feeder to prevent overflow.
Initial Resin Volume Setting
Programming for a manganese greensand system requires a few minor
adjustments to the programming to operate the control correctly. The
initial resin volume should be set to the closest volume of the manganese
greensand in the system. For example, if the system contains two cubic
feet of manganese greensand, program in 2.00 for the resin volume.
"Salt" Setting for KMNO
3
Regenerant
Since the same injector is used for the filter application (FA) system and
the conditioner system, be sure the regenerant (salt) setting is set to High
“H” to allow adequate time to rinse the media.
All other settings will remain the same as mentioned in the previous
programming sections.
Days Between Regeneration Setting (740 FA)
To set the days between regenerations, consult the media manufacturer
for the actual capacity of the media.
In general, manganese greensand has a capacity of 10,000 ppm of
removal capability per cubic foot of media. Calculate the capacity of the
system by taking the number of cubic feet of media and multiply by
10,000.
For example, using a 1 cubic foot system provides 10,000 ppm of removal
capability.
The next step is to calculate the demand for the system. Multiply the
predicted daily water usage by the iron content in ppm.