Watts PWSTA 90-120K - Manual (Page 9)

9
Model 9000/9100/9500
10
Time Brine Refill and Meter Setting Procedure
Programming
1. The control valve is set at the factory for backwash; brine and slow rinse; rapid rinse and brine tank fill times.
Change any of these times by repositioning the pins and holes or adding more pins.
NOTE: Two speed timer motors are available
1/15 RPM has 82 minute Regeneration Time and each pin or hole equals one minute.
1/30 RPM has 164 minute Regeneration Time and each pin or hole equals two minutes.
2. The control valve has a separate brine tank fill cycle.
— Calculate the desired salt setting using the brine line flow control rate of refill (in gpm) multiplied by the
timer setting. Then, using one gallon of fresh water dissolving approximately 3 lbs salt, calculate the refill
time.
Example: A desired 30 lbs salt setting:
The unit has a 1.0 gpm refill rate so a 10 gallon fill is required.
10 gallons x 3 lbs/gals = 30 lbs salt
Set the timer refill section at 10 minutes.
10 minutes x 1.0 gpm = 10 gallon fill
NOTE: There must always be two pins at the end of a refill time to stop the fill cycle.
With the Regeneration times set, place timer back to its original position, making sure the lower right
hand corner snaps back into the backplate and the meter cable slides through the backplate and does
not bind.
3. Setting the gallon wheel.
Knowing the amount of resin in each tank and the salt setting per Regeneration, calculate the gallons
available, using the following capacities as a guide:
NOTE: Based on tank size:
More resin increases capacity, less resin decreases capacity.
More salt increases capacity, less salt decreases capacity.
Example:
DO NOT SET THIS FIGURE - GO TO STEP 4
— Because the control valve regenerates with soft water from the other tank, subtract the water used for
Regeneration. Take each Regeneration cycle and calculate the water used.
(capacity per ft
3
x ft
3
of resin per tank)
= gallons available
compensated hardness of H
2
O
tank diameter = 16"
compensated hardness = 35 grains per gal (tested sample)
ft
3
resin (based on flow rate) = 4
lbs of salt = 8
capacity per ft 3 = 24,000
(24,000 x 4 ft 3 of resin per tank)
= 2740 gallons available before regeneration
35 grains