Fleck 7000SXT Issues

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Xav1029

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After reading through numerous helpful threads, I decided to ask for your advice because I cannot get my softener to function properly. Specs and settings are as follows:

Fleck 7000SXT
64,000 capacity, 2.0 cu ft
City water, 14-17 grain hardness depending on when I test it.
4 adults, 1 todler
#0 Red injector
0.125 BLFC

DF = Gal
VT = dF2b
CT = Fd
C = 40.0
H = 22.0
RS = cr
DO = 28
RT = 2:00
B1 = 8.0
Bd = 110.0
B2 = 5.0
RR = 5.0
BF = 35.0
FM = t1.2

We have had the softener for about a year, and it worked OK for the most part. We were getting some harder (6 grain) water at the end of the cycles, so I decided to inspect the hoses to make sure nothing was clogged. Everything worked fine for one cycle after that, but now it is not drawing any brine whatsoever during the BD cycle. It won't even draw from a cup if I disconnect from the float switch. I have checked for clogged drain lines and cleaned the injector and blfc.

Do my settings look OK? What else should I check to figure out why the system is not drawing any brine?

Thanks\
 

ditttohead

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You may want to rebuild the valve, it is a fairly simple procedure. Brine draw issues are usually a plugged drain line, bad injector, worn valve internals, or one of a dozen other possibilities.
 

Reach4

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Do my settings look OK? What else should I check to figure out why the system is not drawing any brine?
Make sure there is flow from the drain line during brine draw.

During your cleaning the injector screen and injector etc, did you find crud?
 

Xav1029

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Make sure there is flow from the drain line during brine draw.

During your cleaning the injector screen and injector etc, did you find crud?

There is some flow from the drain line during the BD cycle, but not as much as during backwash. I found some particles in the screen during cleaning, but nothing major. I did not add silicone grease when putting back together though. Could air be getting into system?
 

Reach4

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There is some flow from the drain line during the BD cycle, but not as much as during backwash. I found some particles in the screen during cleaning, but nothing major. I did not add silicone grease when putting back together though.
A #0 injector should be sending about 0.3 gpm to the drain if no brine is being drawn. (see graphs in service manual.) That is a lot lower than the 3.5 gpm you get during backwash of a 12 inch tank.

I would use silicone grease or release compound whenever you reuse or replace an o-ring or seal. I use Molykote 111 5.3 ounce tube. That is a lot. You want a very thin coat. This is not the cause of your problem however.

https://www.danco.com/product/0-5-oz-silicone-faucet-grease/ Danco 88693 is probably available locally.

Could air be getting into system?
Your test of removing the tube going to the float valve and putting it in a cup would seem to make that probabliy low; you had bypassed the locations of common leaks. I guess you could suck on the tube. If you suck air, then I would think that means an air leak.

https://terrylove.com/forums/index....-technician-is-scratching-is-head-help.73584/ discusses a brine draw problem for a different softener.
 

Xav1029

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Took apart the valve as suggested, cleaned everything, and put it all back together with a little lube and the system is drawing brine properly again. Appreciate the help!

Could you guys tell me if my settings look OK?
 

Reach4

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Could you guys tell me if my settings look OK?
They are definitely reasonable...
Your C is low compared to your BF number, so you are programming in some extra margin. For 6 pounds of salt per cuft, the BF would normally be 32 instead of 35. Here is a table that shows what C number you could chose for various BF numbers, if you like. So with BF=35, you could change C to 42.3.

lb/cuft ; C= ; BF=
5.063 ; 36.6 ; 27
5.250 ; 37.2 ; 28
5.438 ; 37.9 ; 29
5.625 ; 38.6 ; 30
5.813 ; 39.3 ; 31

6.000 ; 40.0 ; 32
6.188 ; 40.8 ; 33
6.375 ; 41.5 ; 34
6.563 ; 42.3 ; 35
6.750 ; 43.1 ; 36
6.938 ; 43.8 ; 37
7.125 ; 44.6 ; 38
7.313 ; 45.3 ; 39
7.500 ; 46.1 ; 40
7.688 ; 46.8 ; 41
7.875 ; 47.5 ; 42
8.063 ; 48.2 ; 43
8.250 ; 48.9 ; 44
8.438 ; 49.5 ; 45
8.625 ; 50.2 ; 46
8.813 ; 50.8 ; 47
9.000 ; 51.3 ; 48
9.188 ; 51.9 ; 49
9.375 ; 52.4 ; 50
 

Xav1029

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They are definitely reasonable...
Your C is low compared to your BF number, so you are programming in some extra margin. For 6 pounds of salt per cuft, the BF would normally be 32 instead of 35. Here is a table that shows what C number you could chose for various BF numbers, if you like. So with BF=35, you could change C to 42.3.

lb/cuft ; C= ; BF=
5.063 ; 36.6 ; 27
5.250 ; 37.2 ; 28
5.438 ; 37.9 ; 29
5.625 ; 38.6 ; 30
5.813 ; 39.3 ; 31

6.000 ; 40.0 ; 32
6.188 ; 40.8 ; 33
6.375 ; 41.5 ; 34
6.563 ; 42.3 ; 35
6.750 ; 43.1 ; 36
6.938 ; 43.8 ; 37
7.125 ; 44.6 ; 38
7.313 ; 45.3 ; 39
7.500 ; 46.1 ; 40
7.688 ; 46.8 ; 41
7.875 ; 47.5 ; 42
8.063 ; 48.2 ; 43
8.250 ; 48.9 ; 44
8.438 ; 49.5 ; 45
8.625 ; 50.2 ; 46
8.813 ; 50.8 ; 47
9.000 ; 51.3 ; 48
9.188 ; 51.9 ; 49
9.375 ; 52.4 ; 50
Thanks for your help! This chart comes in very handy.
 
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