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  1. #1

    Proper method to change POE oil

    I was watching over the shoulder of my HVAC service tech who was attempting to get the old POE oil out before putting new in. The system is a 3.5 ton Goodman heatpump on 410A. The reason for the new oil is that both the flowrater and the TX have jammed up over a period of about 4 years. The flowrater had a waxy residue on it when it was removed a while back. That just isn't right. So they are completely flushing the system and replacing the oil and 410A.

    -Trouble is only about 2 tablespoons of POE oil came out. He was pushing nitrogen into the valve on the large diameter line and venting through the valve on the small diameter. This would require the oil to travel from the compressor all the way through the coils in the outdoor unit to get out? This just seems like the difficult way to get the oil out to me. But IANAHVST. Any comments?

  2. #2
    Join Date
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    Yes.

    Trust your contractor.

  3. #3
    Join Date
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    Ain't gonna get the oil out that way.
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    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Dec 2002
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    Tampa, Florida
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    Hmm not the correct way...

    Not the correct way to remove the oil from a system. Click on the link below to watch a video on how a system is to be flushed. The guy in this video has made several HVAC videos and does a pretty good job.
    Last edited by beenthere; 10-08-2010 at 05:46 PM. Reason: removed link

  5. #5
    2 out of 3 say this isn't the right way
    -so what is the right way to get the poe oil out of the compressor?

    That was an excellent video but he had the compressor removed. My guy is doing this without replacing the compressor.

  6. #6
    Join Date
    Dec 2005
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    1,918
    Quote Originally Posted by timevacuum View Post
    -so what is the right way to get the poe oil out of the compressor?
    .
    Take it out and flip it.

  7. #7
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
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    You have other problems if in four years your system has a waxy residue jamming up your metering device.

    Do you get your condenser coils thoroughly cleaned every year?
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  8. #8
    Join Date
    Sep 2010
    Location
    NY
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    I think he is inquiring about the coil cleaning because; a dirty condenser coil will cause excessive head pressure and thus an abnormally high refrigerant temp which may have broken down the oil (I am not too familar with POE) but this is probably the case, I am guessing. The only way to get the oil out is to flip it(the comp) and liquid flush the lines with a product designed for that purpose. Bypassing the metering devices on the indoor and outdoor units.

  9. #9
    Alright that makes sense. I'll have a good look and give it a clean. Dr.Zarkloff's got a pretty good description of the basic cleaning process. Thanks.

  10. #10
    Join Date
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    Quote Originally Posted by timevacuum View Post
    Alright that makes sense. I'll have a good look and give it a clean. Dr.Zarkloff's got a pretty good description of the basic cleaning process. Thanks.
    Did you hear he got busted for suspicion of child perversion?

    He is in lock up right now.

  11. #11
    Join Date
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    No, I didn't hear that.

    Got a link?
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  12. #12

    Same thing all over again

    So here we are, it's two years later and it appears that the sliding orifice (aka Flowrater) in this heat pump has jammed once again after a long summer without use. In heating mode, there is plenty of heat in the refrigerant supply to the AHU, the line out is cold and there is very little heat output in the air coming out. I can only assume the small amount of heat output is due to a lack of refrigerant flow.

    I haven't jumpered to test cooling but I seem to remember these exact symptoms last time.

    Assuming that it is the same waxy crap causing the issue:

    -Does anyone have any ideas what could be the source of the waxy crap?
    -One of the previous posters commented that a dirty coil could result in high ref temps. Is there a known upper temperature limit for POE oil or any other R410A additive that I need to beware of once back in operation?
    -Any success on freeing up the slider without sucking down the system and pulling it all apart?
    Last edited by timevacuum; 10-04-2012 at 04:35 PM. Reason: spelling

  13. #13
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
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    11,347
    I should have followed up on my previous reply two years ago, so sorry about the delay.

    I mentioned the dirty coils because high head pressure and high compressor discharge temperatures go hand in glove. When refrigerant oil becomes too hot, it begins to break down and form carbon deposits. A film of this carbonized oil tends to show up in metering devices, because this is the location in the refrigeration circuit that has the most narrow paasage. Everywhere else the carbon partiicles tend to stay in suspension, but precipitate out in the metering device. Just this past summer I saw this first hand in a Trane Voyager rooftop unit with a metering manifold and a double row condenser coil. An unbelievable amount of dirt had built up between the two rows of coil, causing high head pressure. Double row coils can easily be missed by even well meaning techs who clean coils yearly. If you don't split them apart, they don't get clean enough. Not nearly. Micro-channel coils also need careful attention to stay clean.

    The last time your system was serviced, was a new liquid line drier installed?
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

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