Table of Contents
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Table of Contents
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
How To Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Project Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
System Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 -7
Set Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
System Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
Start Up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Duplex Alternating Systems . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Progressive 2-4 Tank Systems. . . . . . . . . . . . . . . . . . . . . . . . .14
Controller Electrical Connections . . . . . . . . . . . . . . . . . . . . . . .15
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
NXT2 Controller Programming and Operation . . . . . . . . . . . . .17
Controller Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Controller Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Controller Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-21
Master Programming Mode Flow Chart . . . . . . . . . . . . . . . 22-23
User Programming Mode Flow Chart. . . . . . . . . . . . . . . . . . . .23
Diagnostic Programming Mode Flow Chart . . . . . . . . . . . . . . .24
Time of Day Programming Mode Flow Chart . . . . . . . . . . . . . .25
NXT2 Programming Parameters and Ranges. . . . . . . . . . . . . .26
Replacing the Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27-28
Replacement Parts - Major System Components . . . . . . .29-30
Replacement Parts - 3900 Upper Powerhead . . . . . . . . . . . . .31
Replacement Parts - NXT2 Controller Assembly . . . . . . . . . . .32
NXT to NXT2 Conversion Kit . . . . . . . . . . . . . . . . . . . . . . . . . .33
Replacement Parts - 3900 Lower Powerhead . . . . . . . . . . . . .34
Replacement Parts - 3900 Control Valve Body . . . . . . . . . . . .35
Replacement Parts - 1800 Brine Valve. . . . . . . . . . . . . . . . . . .36
Replacement Parts - 1800 Injector Assembly . . . . . . . . . . . . .37
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 -40
Water Softener Flow Diagrams . . . . . . . . . . . . . . . . . . . . .41- 42
Flow Data and Injector Draw Rates - Down Flow . . . . . . . . . . .43
for 1800 Brine Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Introduction
Page
Principals of Softening- Ion Exchange
In nature, water acts as a solvent that dissolves substances it
comes in contact with such as solid rock. When water dissolves
limestone rock, which is composed of calcium and magnesium,
the solid calcium and magnesium become ions. This means
they have been dissolved into the water and are now a liquid. An
ion with a positive electrical charge is called a cation. Calcium
and magnesium hardness ions in water are positively charged
cations. When water dissolves enough calcium and magnesium
hardness cations it is classified as hard water, which can cause
lime scale build up in plumbing systems, water spots, and an
increase in soap and cleaning product usage.
Ion exchange water softening is a process where an ion
exchange resin is used to effectively exchange calcium and
magnesium hardness cations for sodium cations in the water.
New, or freshly regenerated, ion exchange resin is saturated with
sodium cations. As calcium and magnesium hardness cations
come in contact with the ion exchange resin, they attach to the
resin and sodium cations are released into the water. This is
possible because the hardness cation are more attracted to the
ion exchange resin than the sodium cations. Therefore, scale
forming calcium and magnesium cations have been exchanged
for non-scale forming sodium cations as the water is treated. If
the calcium and magnesium content of the water is reduced to
less than 17.1 mg/L, that water is classified as soft water.
Eventually the ion exchange resin will become exhausted, depleted
of sodium, and will need to be regenerated with a sodium brine
solution to restore its capacity to soften water. This system
includes a flow meter to track treated water volume and initiate
the regeneration process before resin exhaustion occurs.
Regeneration occurs automatically and consists of 5 steps:
Step 1- Backwash
Approximate Duration 10 Minutes- Fresh water flow is directed
upward through the resin bed, to remove solid particles the resin
bed has captured, sending them to drain.
Step 2- Brine Draw
Approximate Duration 15-20 Minutes- Brine water is drawn from
the brine tank, rinsed over the ion exchange resin, driving away
the calcium and magnesium cations and restoring sodium cations
within the resin. Calcium and magnesium is sent to drain.
Step 3- Slow Rinse
Approximate Duration 40-45 Minutes- Once the brine tank is
emptied of brine water, fresh water will continue to rinse over
the resin and rinse calcium and magnesium cations to drain.
Step 4- Rapid Rinse
Approximate Duration 10 Minutes- After the conclusion of slow
rinse, fresh water will rinse over the resin to ensure any residual
sodium brine has been cleaned from the resin before it returns
to service.
At the conclusion of Rapid Rinse:
Simplex single tank systems return to the "In Service" position.
Multi tank systems remain in the "Stand By" position.
Step 5- Brine Tank Refill
Approximate Duration User Adjustable- In this final step of
regeneration, water is added back into the brine tank so that
a brine solution can be prepared for the next regeneration.
4
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