Autotrol Logix 740 Operation Manual page 41

Volume/Demand Regeneration Setting
SU MO TU WE TH FR SA DAYS
Time & Day
Regen Time & Day
Salt Amount
Capacity
Hardness
SU MO TU WE TH FR SA DAYS
Time & Day
Regen Time & Day
Salt Amount
Capacity
Hardness
PROGRAMMING THE 700 FOR 5-CYCLE FILTER APPLICATIONS
For example, an average person uses 75 gallons of water per day. Four
people living in a home use 300 gallons of water (75 gallons x 4 people) per
day. Assume the incoming water has 10 ppm of iron. Now calculate the
daily demand: multiply the gallons of water used per day (300) by the ppm
of iron content (10) = 3000 ppm of daily capacity usage.
Now take the system capacity (10,000), divided by the daily demand
(3,000) = 3.3 days of capacity. Since you will run out of capacity before the
beginning of the fourth day, the proper setting for days between
regeneration is 3 days.
For example:
4 people x 75 gals per person = 300 gallons used per day.
10 ppm iron x 300 gal/day = 3000 ppm/day
10,000 ppm capacity ÷ 3000 ppm/day = 3.3 days of total capacity
Solution = regenerate every 3 days.
To set a 760 demand system for iron removal you must:
1. Know your media capacity. Generally, one cubic foot of magnesium
greensand can remove 10,000 ppm of iron.
2. Know the iron concentration in your water.
To have your system regenerate on demand, set your system's capacity
(P7) to the appropriate factor. On the 760, it will read Kg, but you will
actually be working in ppm of iron.
KG
1. If your system is one cubic foot, set the capacity to "10" kg, meaning
10,000. For two cubic feet, set the capacity to "20" kg.
2. Set your hardness to the level of ppm iron in your water. If you have 3
ppm of iron, set the 760 control to "3".
3. The control will calculate the remaining volume capacity in gallons
3
(m ) and count down to regeneration.
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