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Thread: Mini split install questions

  1. #1
    DIY Member mar3232's Avatar
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    Default Mini split install questions

    I'm not an HVAC pro but I would say I'm a semi-pro in just about everything else -- electrical, construction etc. and decided to do a small mini split in my bedroom (9000 btu).

    It will be a breeze to do the mechanical stuff and electrical -- the lineset will probably be less than 10 feet, where I plan on putting it. (probably be more like 6 feet or so).

    I've seen a few installs on youtube and it looks pretty straightforward but my question is this --

    If I'm careful and absolutely nothing is leaking, aren't these designed where a DIY'er can actually just connect the lineset and you can pretty much start using them without any additional refrigerant charging?

    I know a lot of you will say get a pro to check it out, but realistically? Guarantee the installation will be A1.


    I guess the hardest part are the bends in the lineset? -- do you guys use some sort of jig or tool for this?

    thanks.

  2. #2
    Plumber jimbo's Avatar
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    With all due respect: BACK THE TRUCK UP. Most of these systems require that the system be evacuated to remove air and non-condensibles, BEFORE opening the king valve to let the charge out of the condensing unit into the system. The factory charge is APPROXIMATE for x many feet of line, but you must set the super-heat or sub-cool using gauges. This is NOT plug and play or DIY.

  3. #3
    In the Trades Tom Sawyer's Avatar
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    And, the charge on mini-splits is critical and weighed in. Gauges are useless too.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  4. #4
    DIY Member mar3232's Avatar
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    Ok. Maybe if I do all of the mechanicals and Mr HVAC approves the install, I can save a few bucks (always on top of my mind). Even a run of 6 feet makes no difference eh?

  5. #5
    DIY Member mar3232's Avatar
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    By the way if anyone is close to Indiana, have a nice Trane heat pump system available -- only 3 years use -- make me an offer.

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