Page 1 of 2 12 LastLast
Results 1 to 15 of 19

Thread: compressor pressure reset

  1. #1

    Question compressor pressure reset

    I have a Ingersoll Rand ~ 2 hp hp 80 gal tank air compressor. The setpoints are 120 psi shutoff and 80 psi turn on. Unfortunately my motorhome tires need 100 psi. When I can't get air into a tire I have to bleed the system until the motor turns on and pumps up enough pressure to inflate the tire. (repeat x 6 tires) I think the compressor has an unloader valve allowing it to get to speed without load.

    What adverse events would occur if I reset the cut-on pressure to 100? Also could I safely push the cutoff point to 125 psi?

  2. #2
    Join Date
    Feb 2003
    Location
    Griswold Connecticut
    Posts
    6,587
    You would be "short cycling" the compressor. Not a good thing to do on a continuous basis ,unless it is designed that way.
    It could be that the 80/120 is the number(s) IR arrived at to just cut down on the duty cycle, and extends the life. It's your compressor, make it do what you need it to do.
    I wouldn't increase the shutoff pressure though. 5psi, multliplied by the surface area of the tank, is a lot of extra energy. IR would have to tell you if the tank is rated for that. You may even run into the tank mechanical relief.
    2HP for an 80 gallon tank seems a little "anemic" to me. I would have expected 5 HP??? That 2HP has to be running for quite awhile to initially bring that tank up to pressure.
    "The first thing you need to know, will likely be the last thing you learn." (Unknown)

  3. #3
    An alternate means would be to buy a tank of nitrogen to inflate the tires. Until I got the motorhome, the compressor serviced all my needs easily.

  4. #4
    Join Date
    May 2015
    Location
    FL
    Posts
    271
    Have you double checked the manual for the compressor specs? That seems really low to start at 80psi for an 80 gallon tank. Most tools are rated at 90psi. So for it to kick on at 80 seems low. Maybe the pressure switch is going bad.
    Jeff Body
    Go-C Graphics

    China 50W Laser
    Model # SH-350
    Controller RDC6442
    Vinyl Plotter Graphtec CE600-60
    Software used
    Inkscape, FlexiStarter, VinylMaster 4, RDWorksV8

  5. #5
    Join Date
    Sep 2009
    Location
    Medina Ohio
    Posts
    3,913
    You should be able to adjust the switch to come on a little higher. most larger compressors come on at 100 PSI or higher. mine kicks on at 150 and off at 175 but it is a 2 stage unit

  6. #6
    Join Date
    May 2018
    Location
    Lancaster, Ohio
    Posts
    198
    Quote Originally Posted by Ruperto Mendiones View Post
    I have a Ingersoll Rand ~ 2 hp hp 80 gal tank air compressor. The setpoints are 120 psi shutoff and 80 psi turn on. Unfortunately my motorhome tires need 100 psi. When I can't get air into a tire I have to bleed the system until the motor turns on and pumps up enough pressure to inflate the tire. (repeat x 6 tires) I think the compressor has an unloader valve allowing it to get to speed without load.

    What adverse events would occur if I reset the cut-on pressure to 100? Also could I safely push the cutoff point to 125 psi?
    I would turn the low end up and put up with the short cycling, as to the high end good chance you will trigger the safety pop off valve

  7. #7
    Join Date
    Nov 2009
    Location
    Peoria, IL
    Posts
    1,497
    I doubt if anyone on here can vouch for exceeding the safety factor designed in by the original engineers. They are the only ones that know the material and testing data. Exceeding a set point in a pressure vessel could result in a horrible result, even fatal result.

  8. #8
    Join Date
    Feb 2014
    Location
    Lake Gaston, Henrico, NC
    Posts
    4,592
    I did that for one of my compressors, to run nailguns, and it hasn't quit working yet. I have it set to come on at 105, and off at 125. That one did come with a 125 kick off point anyway, but it wouldn't scare me much if I turned it up a little.

  9. #9
    Join Date
    Feb 2003
    Location
    In the foothills of the Sandia Mountains
    Posts
    15,257
    Adjusting the cut-in pressure is not difficult to do, Google it. For safety reasons I would not mess with the cut-off pressure side. My 2hp/30gal IR cycles on at 90psi and off at 130psi.
    Please help support the Creek.

    Experience is something you don't get until just after you need it.
    - Steven Wright

  10. #10
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
    Posts
    3,630
    Most home owner swiches are a preset pressure differential. If you raise the low end pressure you raise the high end the same amount.
    You could plumb in two switches and toggle the power through one or the other depending on needing higher output or not.
    Bill D

  11. #11
    Join Date
    Oct 2006
    Location
    Manistique, Michigan
    Posts
    1,254
    Typically the pressure relief valve is what protects the compressor and tank from over pressure and resulting rupture. The high set point isnít what protects the compressor. Raising the set point might cause the relief valve to pop. Consult you manual but also check the name plate. It normally gives you the maximum pressure that the system can handle. You can raise the start pressure set point, short cycle the compressor for just this job and then lower the low pressure set point when you are done airing up these tires.

  12. #12
    Quote Originally Posted by Ruperto Mendiones View Post
    I have a Ingersoll Rand ~ 2 hp hp 80 gal tank air compressor. The setpoints are 120 psi shutoff and 80 psi turn on. Unfortunately my motorhome tires need 100 psi. When I can't get air into a tire I have to bleed the system until the motor turns on and pumps up enough pressure to inflate the tire. (repeat x 6 tires) I think the compressor has an unloader valve allowing it to get to speed without load.

    What adverse events would occur if I reset the cut-on pressure to 100? Also could I safely push the cutoff point to 125 psi?
    I don't understand some of the subleties that you are referring to, but if it were me, I'd just pump up those tires and call it a day. I have that compressor too, la la la. What is the actual issue?

  13. #13
    Join Date
    Feb 2003
    Location
    In the foothills of the Sandia Mountains
    Posts
    15,257
    Quote Originally Posted by Doug Dawson View Post
    I don't understand some of the subleties that you are referring to, but if it were me, I'd just pump up those tires and call it a day. I have that compressor too, la la la. What is the actual issue?
    Doug, if he fills one tire to the required 100 psi and the pressure in his tank drops to 95 psi, he can’t fill the next tire unless he bleeds the tank back down to 80 psi and compressor pumps back up. Essentially, he’s wasting 15 psi and the energy it took to generate it, each time.
    Please help support the Creek.

    Experience is something you don't get until just after you need it.
    - Steven Wright

  14. #14
    Join Date
    Aug 2019
    Location
    USVI
    Posts
    119
    Quote Originally Posted by Bruce Page View Post
    Doug, if he fills one tire to the required 100 psi and the pressure in his tank drops to 95 psi, he can’t fill the next tire unless he bleeds the tank back down to 80 psi and compressor pumps back up. Essentially, he’s wasting 15 psi and the energy it took to generate it, each time.
    So either way he’s going to cycle the compressor a little more to get the tires filled. I’d just up the cut-in as already mentioned. If it’s a Square D switch or similar it probably has adjustment instructions on the back of the cover.

    Sometimes it’s easier to get the tires inflated if you get the weight off em with a jack

  15. #15
    Join Date
    Feb 2003
    Location
    Lafayette, IN
    Posts
    4,342
    Quote Originally Posted by Steve Fish View Post
    Sometimes it’s easier to get the tires inflated if you get the weight off em with a jack
    Absolutely false. The air pressure in the tire does not change whether it's loaded or unloaded. The weight that a wheel is bearing only affects the size of the contact patch of that wheel, due to tire deformation. If one of his motorhome wheels is bearing 2000 lbs, and it's at 80 PSI, then there's 25 sq. in. of tire on the ground. If he bumps that pressure up to 100 PSI, then there's 20 sq. in. of tire on the ground. The air pressure doesn't care what the loading of the tire is, nor what shape it is. The only thing that would make a tire easier to fill is a much higher supply pressure than what's in the tire.
    Jason

    "Don't get stuck on stupid." --Lt. Gen. Russel Honore


Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •