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  1. #1
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    What to do next after open high side valve (newly installed split unit)



    Hi. After connected pipings at those indoor and outdoor joints. Usually we will open the high side valve with Allen key. Then purge the refrigerant at the low side refrigerant adapter and then only open the low side valve. Is this the correct way?



  2. #2
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    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: What to do next after open high side valve (newly installed split unit)

    NO.

    You should evacuate the lines to remove moisture after your pressure/leak test.

    Only then should you open the valves, no purging of refrigerant.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
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    Re: What to do next after open high side valve (newly installed split unit)

    It's the correct way if you want to purge but what Brian is saying is you should really get a vac pump.

  4. #4
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    Re: What to do next after open high side valve (newly installed split unit)

    No purging of lines with refrigerant to atmosphere, pressure test lines with nitrogen then evacuate then open valves.

  5. #5
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    Re: What to do next after open high side valve (newly installed split unit)

    Sadly that's what people do but it's wrong,vacuum observe the regs

  6. #6
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    Re: What to do next after open high side valve (newly installed split unit)

    Thanks for the info.

    What you guys mean is after I have opened the high side valve I have to vacuum the suction line and then only open the low side valve?

  7. #7
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    Re: What to do next after open high side valve (newly installed split unit)

    Hi, after installing the piping and connected everything to indoor and outdoor connect a vac pump before opening any valves. If you have any gauges there should be a -1 reading that tells you that vacum is being done. I love to leave them around 30 min before I open the valves to let the gas in the piping.

  8. #8
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    Re: What to do next after open high side valve (newly installed split unit)

    Quote Originally Posted by hvac_weng View Post
    Thanks for the info.

    What you guys mean is after I have opened the high side valve I have to vacuum the suction line and then only open the low side valve?
    Valves on the outdoor box are closed. Connect your copper tubes to both indoor and outdoor box. Gauges are important. Connect the Blue hose to the valve on the outdoor box brass valve that is hidden under a 5/16 cap nut.
    The Valve depressor is in the angled end of the blue line.Now you are set up for a pressure test......

    Would someone kindly explain the remainder of this process before i consider sniffing Glue
    To the optimist, the glass is half full. To the pessimist, the glass is half empty.

  9. #9
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: What to do next after open high side valve (newly installed split unit)

    Please warn all of those watching you fit this machine that you do not know what you are doing, cannot read instruction books, and it might all go bang,
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

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