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Thread: Spa heating

  1. Back To Top    #1

    Join Date
    Jul 2009
    Location
    Central Florida
    Posts
    17

    Spa heating

    I have recently moved into a home with an inground pool and spill over spa. A heat pump is attached to the system to heat the spa and/or pool. I haven't really played with the spa too much yet, but I have fired it up a few times and it took about an hour to raise the spa temp 5 degrees. When the system is in spa mode the heat pump comes on and the valve actuators isolate the spa from the pool plumbing as expected. The owners manual for the heat pump states that it is best to leave the spa air bubbles off when attempting to heat the pool because it can slow the heating process significantly. The problem is, I have no idea where the spa bubbles are coming from or how to stop them. There is an air intake (i think) pipe coming out of the ground near the spa, but I don't see any valves or devices that might be part of the "air injection" process.

    Is there some sort of voodoo at work here? How is the air injection typically accomplished on a setup like this and what is the best way to temporarily disable it?
    10K IG plaster (9,500 pool + 500 spa)
    Cartridge filter rated 120GPM (Jacuzzi SherLok 120MB)
    Pentair Intelliflo VS3050

  2. Back To Top    #2

    Join Date
    Jul 2009
    Location
    Central Florida
    Posts
    17

    Re: Spa heating

    Nevermind, I figured it out. It seems the "air injection" is as simple as having an air intake pipe plumbed into the spa returns. Or at least that is the way it appears. I covered up the air intake pipe and the bubbles stopped and I didn't hear the sound of something about to explode/implode. I can't really wrap my head around why that air intake draws in air instead of water blowing out of it, but that is probably none of my business anyway.
    10K IG plaster (9,500 pool + 500 spa)
    Cartridge filter rated 120GPM (Jacuzzi SherLok 120MB)
    Pentair Intelliflo VS3050

  3. Back To Top    #3

    Join Date
    Jun 2009
    Location
    Vero Beach, FL
    Posts
    462

    Re: Spa heating

    Quote Originally Posted by Cleavitt
    I can't really wrap my head around why that air intake draws in air instead of water blowing out of it, but that is probably none of my business anyway.
    http://en.wikipedia.org/wiki/Venturi_effect
    25' x 13' Roman, 12000 gal IGP, Plaster, with 500 gal Spa
    SWG, 1 HP Max Flo Pump, C-900 cartridge filter
    Solar heat

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