Today we see what’s inside a semi hermatic compressor. I’m not an expert on these so I wanted to tear one apart to become more familiar with it and I’m taking you along for the ride.

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18 thoughts on “Copeland compressor teardown

  1. dave johnsonnola says:

    Saving and coming back to this. Have a True 2 door reach in that has was pulled from service and mothballed. Outside contractor diagnosed as "grounded". Good looking box, want to drag it out and see.

  2. Brandon Price says:

    Hello Bill, my name is Brandon. You and I are way too much alike being so curious about things and how they operate and all that. This is a really cool video. I’m still a “newbie “ in HVACR. Actually I’m in school for that field. I greatly appreciate your videos. Thanks for sharing them. Keep them coming.

  3. C Thompson says:

    Bill the first set of reeds were the suction reed valves, the one on top of the valve plate are the discharge valves.
    You can service the valve plate by buying a kit.
    It comes with gaskets, reeds locating pins and plate with already has discharge reeds installed.
    Something that small normally we would return for a core deposit.
    I don't work on stuff that small anymore and don't ever remember changing the oil pump.
    4R 6R 4D and 6D we do.
    the three terminals with stake on connectors are for overloads in motor windings.
    On larger compressors, they have thermistors that go to a stand-alone control which for the life of me can't remember the name at this time.
    It reads the resistance of the thermistors inside the windings and opens control circuit when too hot.
    If I remember the name I will edit

  4. Derrick en Buenos Aires says:

    Crazy. Looks just like the compressor I did a teardown on not too long ago. Type K as well but in my case it was an "Acmarmetic". Wonder if Copeland produces for them as well or if the design was bought. Those two large holes on the valve plate are where gas is introduced into the suction chamber and on the other end the discharge chamber. You can see exactly how they are separated by the head design or gasket. As the piston pulls down, the gas that is already in the suction chamber will be introduced to the piston and piston chamber where it is ejected out through the discharge reeds and into the discharge chamber where it exits out into the discharge line. Cool stuff. It's way easier to just open the compressor head and hope to find that it's just one of the reeds broken. You can do it on site instead of lugging around a compressor and that's usually a two man job for these. Most of the time I just replace the whole plate and gaskets. You can test how well the compressor performs as well by putting a gauge on the discharge service valve and sealing up the outlet with a flare nut and piece of copper welded at the end. It should jump up to 500 psi within a few seconds if everything is put together right and tight. Have fun out there.

  5. ACtech Formally yo mama says:

    That being a scrap compressor didn’t stop me from cringing when you were hammering that scrapper under the head then hitting sideways with the hammer. The proper way to remove the head would be. Leave 2 bolts on either side of the head. Hit straight down with the hammer. The gasket normally let’s go after a couple of hits. What you were calling the reeds were the valves. The pins they fit on are very brittle. If you break one you are so screwed. This is on all semi hermetic compressors. 06D and 06E. Always lift the head straight back from the compressor. You can get a broken pin out but it is a real bitch to do. Anyway that’s why I cringed lol.

  6. sivalley says:

    When you were pulling on the small end plate I was thinking to myself "No! Don't pull! That's how I broke the oil pickup tube on a compressor I was refurbing when I first started!" 😁

  7. Luzt says:

    Thank you! Was I mistaken or were the valve plates put the other way round (projecting into the cylinder rather then pressing against valve plate).
    Regarding comments on naming particular parts, this is what is think:
    – the whole assembly providing function of one-way flow is a "reed valve",
    – moving thin blades are "reeds",
    – the part limiting movement of a reed is a stop plate.

  8. LMSILVIA says:

    I rebuild those for a living, whenever you see the front cover with that little lid with 4 bolts it is an oil pump model and needs to have the bottom lid opened so you can remove the oil pump pickup tube. The ones with plain covers on the crankcase have centrifugal lubrication.

    The majority of the compressors i work on have 10+ years and some i recognize from 20 years ago when i was starting…

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