Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit


can someone explain how an unloader works, and its importance in regulating oil flow.

learned there was too much oil in a compressor



  • RJ_4RJ_4 Member Posts: 484

    Unloaders dont regulate oil they are a capacity control   look up suction cut off unloader or   www.xpedio.carrier/idc/groups/public/documents/...     sounds like you have an oil return problem which someone misdiagnosed, so they kept adding more oil.   at this point i would recommend that you take a class on compressors at your carrier dealer and recheck the design of your system  (piping sizes, unit sizing and air side design
  • unclejohnunclejohn Member Posts: 1,572
    On old

    5f Carrier compressors they used oil pressure to load and unload the heads. On the O6's they used refrig. pressure to overcome spring pressure and would load and unload that way. A loaded head would work like a normal recip. a unloaded head would by pass the gas back into the crankcase through a check valve in the valve plate or a bypass internal in  the head or external back into the crankcase.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!