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Compressor Cut Out, Yong Heng.

Discussion in 'Technical' started by Cess monk, Oct 6, 2019.

  1. Cess monk

    Cess monk Active Member

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    Today I set up my mates compressor, we topped up a 3ltr and a 4ltr bottle to 300bar no problem. He then decoded to try and fill a 12ltr bottle from empty. After 10 minutes run time the motor shut off. We left it a while then it started up again. This happened 3 times, has anyone had this problem and I'm presuming there's an overheat stat on the motor itself. The compressor temp didn't go above 50c so I put it down to the motor,
    Any info is very welcome, cheers.
     
  2. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    No expert on these, but almost certainly an auto shot off due to overheating?
    Theres a few threads on these (use the search function) and on the web generally.
    General advice is to change the oil before you do anything with one of these new compressors, as they tend to be full of swarf, cr*p, etc. Lots of peeps also set up larger water cooling systems, eg: just using a bucket quickly results in warm / hot water, (in the bucket) so the motor is then not cooled, so peeps use larger water reservoirs, etc. Cheers... :)
     
  3. bigal

    bigal Jedi.

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    and bags off ice in the water, anything cooler on a compressor helps, will take a very long time to fill a empty 12lit up. that's doing more that wots it's made for to do , gun filling, bottle top,ups . not hours filling. ;) al
     
    johnbaz, pjgtech, ped and 2 others like this.
  4. krugerandsmith

    krugerandsmith Engaging Member

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    Agreed.
     
    HW100Tuning likes this.
  5. Cess monk

    Cess monk Active Member

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    It was the electric motor that was or must have been overheating, the compressor never got above 50 degrees. I wondered if anyone knew if there was an overheat stat on the electric motor.
     
  6. HW100Tuning

    HW100Tuning Straight Pride

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    What he said....
     
  7. sagalout

    sagalout Stoptober failed!

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    Didn't @Lev Levvin find it was a knackered pressure sensor on his?
     
  8. Lev Levvin

    Lev Levvin Big Poster

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    My single piston compressor shut down and never started again after it’s first use

    It was due to a knackered relay box

    I got a refund and bought a bigger twin piston ‘Davv’ Compressor

    Superb thing and really fast fill

    Yes these have overheat sensors and will shut down if too hot.

    What Ive done is to plumb mine into an outside tap... using American fridge rigid pipe and fittings...

    I run cold water through the compressor and let it run out into the drains.

    Stays at around 45-50c after running for 30 mins
     
    sagalout likes this.
  9. Cess monk

    Cess monk Active Member

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    Cheers everyone, lev, I had it piped from the mains and it worked a treat. I thought the shut off had to be electrical. Looks like he'll have to use it in shorter bursts untill he gets the bottle filled.
    Thanks again for all the advice.
     
    Lev Levvin likes this.
  10. Lev Levvin

    Lev Levvin Big Poster

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    These compressors are excellent for top-ups...

    I never let my bottle drop below 170 bar, plug it in to the compressor and get it back up to 300 within 10 minutes.

    Filling a 12L bottle from empty is a big task for a commercial dive shop compressor and way too much to expect these home compressors to handle.

    It WILL do it, but it would take hours allowing 10 mins run time then 30 mins cool-off time

    Don’t forget the water only cools the cylinder head, the motor and oil in crank case will remain very hot and cause shut downs if temp gets too high
     
    ped likes this.
  11. Cess monk

    Cess monk Active Member

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    Cheers lev
     
    Lev Levvin likes this.
  12. Lev Levvin

    Lev Levvin Big Poster

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    My recommendation is to pay to have your tanks filled at a dive shop then don’t let pressures drop below 170bar before topping them up again.

    The compressor will do this job perfectly
     
  13. monsta41

    monsta41 Donator

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    those compressors are designed to fill guns, not cylinders
     
  14. Lev Levvin

    Lev Levvin Big Poster

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    Don’t forget to allow the compressor gauge to reach 170 bar before you crack open the bottle valve.

    It happens pretty quick so keep an eye on the gauge

    You need to equalise the bottle and compressor pressures before opening bottle valve, or the higher pressure in the bottle can whack into the piston and bend stuff

    Not good!
     
  15. Lev Levvin

    Lev Levvin Big Poster

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    Not these ones Monsta.

    They’re rated to 5 litre bottles
     
  16. Lev Levvin

    Lev Levvin Big Poster

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    Sorry... the single cylinder ones are rated at 3 litre bottles...

    My twin cylinder is rated for five litres.

    They’ll do much more ( 300 bar is same in 1litre bottle or a 12 litre) but you need to allow cooling time
     
  17. Lev Levvin

    Lev Levvin Big Poster

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    Biggest balls ache with my Davv twin cylinder is it’s rated at 16amps...

    So I have to run it through the 35a cooker socket or it trips out the power :facepalm:

    I rigged up a caravan type hook up lead with blue and white sockets 98379A1A-5C6B-46B4-B8B3-77B11B04F912.jpeg 10C9C4F7-9126-44A8-BCF7-07F3344FD55D.jpeg
     
    bigal and Tim_B like this.
  18. sagalout

    sagalout Stoptober failed!

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    On another thread @Metradio recommends using a one way valve.
     
  19. Thiel

    Thiel Donator

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    my yh had a one way valve beetween cylinder and gauge
    it was no problem to open the tank valve first
    but the o-ring in the valve got smoked after some run time because it could not take the heat i guess. came out in small pieces and i did not replaced it. filling my guns now direct so need for it.
    without the check valve it did not start running when the bottle valve was openend first. humming noise from the motor but no movement - sounds really bad.

    is that bigger davv compressor a 3 stage ?
     
    Lev Levvin likes this.
  20. Lev Levvin

    Lev Levvin Big Poster

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    Don’t know what you mean by 3 stage?
     

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