Watts PWSTA 90-120K - Manual (Page 10)

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Model 9000/9100/9500
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Example: Unit is set for a 16" diameter tank with 4 ft 3
of resin and salted at 8 lbs. per ft
3
, 7 gpm backwash,
#3 injector, 1.0 gpm brine refill, and 60 psi and timer set for 10 min. backwash, 60 min. brine and
rinse, 10 min. rapid rinse, 10 min. brine tank fill.
With the 2740 gallons available calculated in Step 3, subtract the Regeneration water used from the
total water available.
4. Set meter wheel at approximately 2530 gallons. Lift the inner dial of the meter program wheel so that you can
rotate it freely. Position the white dot opposite the 2530 gallon setting.
NOTE: There is a slight delay between the time the meter zeros out and the cycle starts. Units using the:
1/15 RPM motor, 82 minute Regeneration Time has a 9 minute delay
1/30 RPM motor, 180 minute Regeneration Time has an 18 minute delay.
This delay period is not critical on residential equipment. However, take this factor into consideration
for commercial applications by subtracting continuous flows for 9 minutes or 18 minutes from water
available.
5. Insert meter cable into meter.
6. Check bypass.
7. Plug in unit.
Backwash 10 minutes x 7.0 gpm = 70.0 gallons
Brine and Rinse 60 minutes x 1.0 gpm = 60.0 gallons
Rapid Rinse 10 minutes x 7.0 gpm = 70.0 gallons
Brine Tank Fill 10 minutes x 1.0 gpm = 10.0 gallons
Total Regeneration Water = 210.0 gallons
2740 gallons available - 210 gallons used = 2530 gallons
(in Regeneration, Step 4)