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Help re-plumbing an air compressor.

Discussion in 'Electronic Repair' started by amdx, Dec 9, 2013.

  1. amdx

    amdx Guest

    Hi all,
    My dad gave me an air compressor many years ago, at some point, one
    of the tubes from the compressor to the tank broke. I had another so, I
    ignored it. It has sat for years and parts have scattered. It seems like
    this would be obvious, but I don't know to put this back together. I
    find one open male connection going to the tank and two
    male connections on the compressor, one larger than the other.
    The shut off switch and the pop off valve are intact as are a valve on
    the tank and a valve to adjust output pressure.
    I just can't make sense of two connections to the compressor and one
    to the tank.
    Any Ideas?

    Sanford Manufacturing
    Model 104A200-22
    22 Gallon Tank
    2 hp motor

    Thanks, Mikek
     
  2. I assume you have one that turns off when pressure has reached its set
    point? There should be a pressure switch on the tank.

    you have an inlet and a outlet on the compressor.. there should be a
    arrow to mark the direction that compressor turns. If you are not sure,
    start it up so see which way the motor turns.

    The inlet should have some kind of filter on it. if you put your figure
    over what you think is the inlet and then hand spin the pump
    in the correct direction, it should create vacuum (inlet) and the other
    should create pressure (outlet)

    Outlet most likely goes to the tank or into the pressure switch which
    goes to the tank.

    Inlet needs a filter on it.

    Etc..

    Jamie
     
  3. amdx

    amdx Guest

    Thanks for the picture, wish it had little better detail.
    I'll study it a while, my dad modified it with a third gauge,
    which makes things different, but if I need to, I'll go back to
    original and work from there.

    Thanks, Mikek
     
  4. amdx

    amdx Guest

    Now that you have sent the picture you probably see the the two
    tubing connections where 81 and 82 attach. and the air intake on the
    opposite side.
    Ya, that's no problem, easy to tell the inlet from the out. But it still
    has two connections to the compressor besides the intake.
    Thanks much, Mikek
     
  5. amdx

    amdx Guest

    I have powered the motor and I find both of the connections
    on the compressor have air pumped out. I think the center, larger
    fitting is the main outlet to fill the tank. I don't understand the
    second and the drawing doesn't help, because where it goes, I don't see
    anything for it to attach to. There's nothing behind the pressure switch
    as shown.
    Mikek
     
  6. amdx

    amdx Guest


    After some investigation, I think I have a handle on it.
    It has become clear parts have been changed.
    I probably need to buy some new parts.

    I found this picture:

    http://tinyurl.com/mwb2dfl

    Which show where the tubes land. But there is no landing for the small tube.

    And then I looked up the pressure switch.

    http://tinyurl.com/lx95566

    This shows where the second smaller tube will land.

    Thanks, Mikek
     
  7. N_Cook

    N_Cook Guest

    Is there a way to test that the over-pressure pressure release mechanism
    is not seized/corroded shut and a bomb in the making?
     
  8. amdx

    amdx Guest

    I need to purchase a new pressure regulator, the one on it is not the
    correct type. The unit has on over pressure valve. After $50 is removed
    from my wallet it will work as designed.
    This is actually boat related. I acquired ownership of a pontoon
    platform. One corner is low in the water, I started pumping air into the
    pontoon yesterday with a small air compressor and didn't see much
    movement, so I decided to get out this bigger compressor and started
    trying to make it work.
    This morning, using the small air compressor, I saw bubbles that I
    missed yesterday. There is a 4" x 7" plate at the front of one pontoon
    that leaks. Today I will remove the plate and pump the water out. The
    goal is to get it out of the water and home.
    Thanks, Mikek
     
  9. Jerry Peters

    Jerry Peters Guest

    The smaller tube is probably for the head pressure relief. When the
    pressure switch turns off, it presses a pin on a small valve which
    relieves the pressure in the compressor so it can restart without
    overloading or stalling the motor.
     
  10. Tom Miller

    Tom Miller Guest

    It is called an unloader.
     
  11. amdx

    amdx Guest

    Ahhh, that's making sense, I could not understand why there were two
    inputs to the pressure switch. Now I understand.
    Jon has mentioned a check valve, where does this go in the pneumatic
    circuit?
     
  12. amdx

    amdx Guest

    Hi Jon,
    Where does the check valve go in the pneumatic circuit?


    The pressure
    Looks like I'll be ordering a new pressure regulator and check valve.
    I need to check the diagram and see where the check valve is supposed to
    be, I don't think there is one.
    Thanks, Mikek
     
  13. Tom Miller

    Tom Miller Guest

    There must be a check valve or the unloader would empty the tank. It is
    usually located in the inlet to the tank. The compressor output goes to a T
    connector then to the check valve. The center of the T goes to the unloader.
    The pressure switch connects to the tank directly.

    Sometimes all this is integrated into the pressure switch.
     
  14. amdx

    amdx Guest

    I'm still having a problem.
    I ordered a new pressure switch,
    http://www.amazon.com/Pressure-switch-compressor-95-125-unloader/dp/B00273UQQQ/ref=pd_sim_hi_2
    I have plumbed and wired it.
    As I said before, the compressor has two outlets, one 3/8" and a smaller
    one 1/4". The larger I connected to the tank, the smaller goes to the
    unloader on the pressure switch.
    The motor will start and then shortly the circuit breaker pops.
    The air intake does has air coming out in puffs.
    My next step will be opening the unloader tube to see if the
    compressor will keep running. ( I think i might) but I don't know what
    that means. I'll also change outlets, maybe I just have a weak breaker,
    but I doubt it.
    Later today, I'll take some pictures, maybe someone can see what I've
    done wrong.

    Thanks for you suggestions, Mikek
     
  15. amdx

    amdx Guest

    Here's a picture of my plumbing job,
    http://s395.photobucket.com/user/Qmavam/media/CompressorTubing_zps2292e455.jpg.html
    I did unhook the small tube going to the unloader and the compressor
    will run fine. It does not have the air puffing out of the air intake as
    before with the unloader tube connected.
    I doesn't fill up the tank either, I suspect because all the air is
    coming out the unloader tube.
    Any ideas?
    Thanks, Mikek
     
  16. Tom Miller

    Tom Miller Guest

    Where is the check valve? How many connections does the tank have? Where
    does the pressure switch connect to the tank?
     
  17. Shaun

    Shaun Guest

    "amdx" wrote in message

    Hi all,
    My dad gave me an air compressor many years ago, at some point, one
    of the tubes from the compressor to the tank broke. I had another so, I
    ignored it. It has sat for years and parts have scattered. It seems like
    this would be obvious, but I don't know to put this back together. I
    find one open male connection going to the tank and two
    male connections on the compressor, one larger than the other.
    The shut off switch and the pop off valve are intact as are a valve on
    the tank and a valve to adjust output pressure.
    I just can't make sense of two connections to the compressor and one
    to the tank.
    Any Ideas?

    Sanford Manufacturing
    Model 104A200-22
    22 Gallon Tank
    2 hp motor

    Thanks, Mikek


    Just go buy a new one, that is a small air compressor - not worth bothering
    with

    Shaun
     
  18. Jerry Peters

    Jerry Peters Guest

    You do have the check valve connected in the right direction?
     
  19. amdx

    amdx Guest

    I have found the problem. Half of the check valve is part of a
    manifold. The manifold should hold a spring to push the ball against
    the seat. No Spring!
    Thanks, Mikek
     
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