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Thread: Reserve Selection for Fleck 7000SXT

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  1. #1
    DIY Junior Member Wally107's Avatar
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    Default Reserve Selection for Fleck 7000SXT

    Although this is related to my other thread, it's a little more specific, and may be more helpful to all forum members as a new thread.

    I'm in the process (with Gary's assistance) of tweaking the programming of my new Fleck 7000SXT 64K (2.0cuft) system.

    When you get to Reserve Selection, there are 3 options:

    Safety Factor - expressed as a percentage of the total capacity
    Fixed Reserve Capacity - expressed as a gallon volume to be held as a reserve
    Variable Reserve - from the Pentair manual: "Variable reserve refills the brine tank based on
    gallon volume remaining when the unit starts regeneration."

    From everything I've read, it seems Variable Reserve is the most "automatic" (i.e. goof-proof) method for establishing a reserve. However...

    I've just begun to understand the concept of salt dose, and it's relationship to the Brine Fill cycle.

    "...refills the brine tank..." Does this mean that Variable Reserve actually adjusts the salt dose?

    Wally

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    DIY Senior Member mialynette2003's Avatar
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    Yes. The unit know how much capacity it has left so it does not have to regen that amount.

  3. #3
    That's all folks! Gary Slusser's Avatar
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    Quote Originally Posted by mialynette2003 View Post
    Yes. The unit know how much capacity it has left so it does not have to regen that amount.
    That is the usual description for variable brining; it varies the amount of refill which equals lbs of salt which regenerates so much capacity which is figured in gallons.

    I don't see how that relates to variable reserve.

    Variable reserve usually causes a regeneration before the meter zeros based on an average of capacity used per day over the last X (7) days and if the historic volume for 'tomorrow' will get into the reserve set aside in the computer, then it will start a regeneration (at the scheduled time, usually 2AM). It does that within the K of capacity you program and that does not include any reserve capacity.

    Fleck may be doing it a bit different.
    Gary Slusser Retired (= out of business)
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    DIY Junior Member Wally107's Avatar
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    Quote Originally Posted by Gary Slusser View Post
    That is the usual description for variable brining...
    Gary - I thought the exact same thing (after reading some of your other posts elsewhere).

    I was also reading the Pentair 7000SXT manual (link below). On page 6 paragraph 3, it talks about changing the Control Type. The default is "Meter Delayed - Fd"...and then on page 7 paragraph 10 it talks about changing the Reserve Selection to Variable Reserve (cr)...I presume these both need to be changed to for the Variable Reserve function to work...hmmm.

    http://www.pentairaqua.com/Files/Kno...%20Rev%20D.pdf

    Methinks a call to Pentair may be in order - although I doubt I'll get a straight answer.

  5. #5
    That's all folks! Gary Slusser's Avatar
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    Yes I would think it has to be metered-delayed but I base that on Clack's variable reserve and Autotrol's Technetic 1000 and Avantapur 'proportional bring'.

    Years ago as a dealer, Fleck's tech support was very good at answering questions.

    Let us know what you find out.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

  6. #6
    DIY Junior Member Wally107's Avatar
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    Just received this email from Pentair (Wayne Ploense's responses in italics)

    Question: Brand new 7000SXT. Came equipped with .125gpm BLFC. Any problem
    changing it to .5 or 1.0 BLFC (to shorten BF and therefore overall regen time)?

    Yes, the refill rate is based on injector size due to this unit refills the
    brine tank with soft water back through the injector orifice size. Your unit is
    giving you treated water after rapid rinse, not refill. Nor does it need to be
    back in service before you have treated water. You have until the next regen to
    have that brine tank refilled.


    I need to clarify with him, but I think he's telling me: Do not change the BLFC...since it's calibrated (my word) to the injector. It sounds like if I change the BLFC, I'd need to change the injector as well - probably more work than it's worth (?)

    Also, to use Variable Reserve, do I need to change both the Control Type (to
    fdPb)

    No that is a variable fill not variable reserve. Just change reserve to
    (cr).


    I interpret this to mean: Where the manual talks about Control Type, it's actually talking about (what we call) variable brining (what he calls "variable fill").

    Here's his contact info, incase anyone ever needs it:

    Wayne Ploense

    Pentair Water

    Technical Sales/Support, CWS-1

    1-800-279-9404 Ext 2119

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