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Thread: Keep main drain closed after blowing out lines?

  1. Back To Top    #1

    Join Date
    Jul 2012
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    Herndon, VA
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    Keep main drain closed after blowing out lines?

    Just trying to make sure this is correct.

    After the lines have been blown out, the pool service left the jandy valve with the main drain side closed.

    This is correct?


    If, by chance, the jandy valve was moved at some point over the winter, does that mean water could get into the main drain line, and if there was a freeze, crack the main drain line?

    I'm asking because I've got a 4 year old and a 2 year old, and they could quite easily go up to the valve and touch it during the winter months.


    Thanks.
    8,000 gallon, in ground, fiberglass pool with a cartridge filter.

  2. Back To Top    #2
    dw9000's Avatar
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    Aug 2014
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    NW Ohio
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    178

    Re: Keep main drain closed after blowing out lines?

    Yes, that is correct,, blow out the main drain and shut the jandy so the main drain is OFF - 'air locked'.

    My jandy has a little thumb nut I can loosen and remove, then remove the handle.
    In-ground block / vinyl liner 33' x 22' x 5',, approx 25k gals
    Cartridge Filter
    Floor drains, 2 skimmers, 3 return lines (2" plumbing ultra-flex PVC)

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    Catanzaro's Avatar
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    Jul 2014
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    Re: Keep main drain closed after blowing out lines?

    You could do a few things:

    1) You could remove the Jandy Valve completely so your children to not mess with it. Take some pictures before you do this so in the spring you can put everything back.

    2) You could place a black strap (or a few of them) and tighten them enough where the valve will not move. There are pins that you can place next to each other that will lock everything in place. I also put another strap for the valve. You can see the pins are the 180 & L90 (You may not be able to see this). It is the valve on the left.

    IMG_1045.jpg

    3) As extra insurance, you can open up the pump housing and place black rubber plugs on both the suction and return side.
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

  4. Back To Top    #4

    Join Date
    Jul 2012
    Location
    Herndon, VA
    Posts
    419

    Re: Keep main drain closed after blowing out lines?

    thanks for the replies!
    8,000 gallon, in ground, fiberglass pool with a cartridge filter.

  5. Back To Top    #5

    Join Date
    Jul 2008
    Location
    Flintstone, GA USA
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    112

    Re: Keep main drain closed after blowing out lines?

    I never blow out my main drain. Water will seek the lower level and you will not have a problem. My pool is 37 years old and never worried about the main drain. But I don't live in upper USA. But my lines would freeze if they are above ground and water got into them.
    Tom

    18 x 36 Grecian Polynesian Fiberglass Walls with Concrete bottom - 3 ft to 9 1/2 ft. deep -
    Hayward Variable Speed Super Pump SP2600VS 1 1/2 True HP,Hayward sand filter S200, and Hayward auto clorinator. Hayward 250,000 natural gas heater. PoolKeeper automatic water leveler. Loop Loc Ultra Solid Safety Cover. Hayward Color Logic 12 volt light. Dual Pool Deck Jets.
    Polaris 380 auto cleaner. Trouble Free Test Kit TF-100.

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