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A/C Compressor question

Discussion in 'HVAC' started by CSkipR, Aug 3, 2012.

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  1. CSkipR

    CSkipR Member

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    The boat has two compressors and both are working okay, but the top of one of the compressors is very hot to touch while the other one is warm. Is the hot one a sign of low freon or something else?
    Thanks
  2. Capt Ralph

    Capt Ralph Senior Member

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    They can get hot. Bring on an A/C tech and make sure all is well. Those things aren't cheap.
    I deliberately flood a lil bit more r22 in the system and it cools that compressor top a bit. The backside, Higher head pressure in reverse cycle for heating. More condensation around the compressor tubing.
    I have split systems all thru my ER. They are still warm but I'm not burned when I have to move around the compressors for other ER services.
  3. C4ENG

    C4ENG Senior Member

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    If you have scroll compressors, than they should be hot to the touch on top with a proper gas charge and every thing else working right. The one that is not hot is the one that I would look into more and I would start by throwing some gauges on the unit to see the psi.
  4. C4ENG

    C4ENG Senior Member

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    Have you seen the price increase of 22 lately? Last I heard $400 for a 30lb jug that normally went for $130. They are trying to eradicate R22.
    Be aware that if you over charge than your not going to be transferring heat properly and really be doing yourself a disfavor.
  5. Capt J

    Capt J Senior Member

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    I agree don't overcharge. I've heard that when the patent runs out for Dupont on like R 12, and then R 22, the EPA seems to find that it is not environmentally friendly and phases it out and all of a sudden Dupont has a new freon, such as the R143 that replaced R12 and the R410 that is replacing R22 with well a new patent.......
  6. K1W1

    K1W1 Senior Member

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  7. CSkipR

    CSkipR Member

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    Cruiseair Marine ac

    Not really sure what type of compressor it is. Scroll or other. Its your typical cruiseair split unit marine ac unit about 6 years old.
    Thanks
  8. wdrzal

    wdrzal Senior Member

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    These questions can't be answered without more information.
    Post a picture of each compressor.(are they the same model)find and post model number & manufacturer. What gas are they charged with? Then measure the temperature on top of the compressor or line comming out(discharge temp.). Most hermetic compressors reject ~5% to ~15% of their heat through the shell.

    There are different types of compressors ,some can get hot from being overcharged. Someone may have replaced the capacitor with the wrong microfarad (uF) one causing it to run hot.....

    Running hot may be normal, or not,just not enough information to diagnose properly
  9. Capt Ralph

    Capt Ralph Senior Member

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    You have ole Tecumseh compressors. I did not mean overcharged but on the high end of the full scale. An A/C tech in your hood will know what I mean.
    On the hot running unit, Is the return line (Larger of the two) cold when running?
  10. CSkipR

    CSkipR Member

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    Cruiseair marine ac

    Here are the two model numbers and serial numbers
    FX16C sn44585210
    FX16C sn44571533

    Both units run off of one water pump. The unit where the top of the cylinder (compressor) is extemely hot I also noticed that the inlet water line is also very hot if that helps.
  11. K1W1

    K1W1 Senior Member

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    Hi,

    If both are fed by the same pump you should check the SW side of things.

    See if the water is flowing into the condenser ok, see if it flows out at a similar rate and then see if it flows overboard at a similar rate.

    If there is good flow at the inlet and not much at the outlet a coil cleaning maybe the answer.
  12. Capt Ralph

    Capt Ralph Senior Member

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    Do you hace two water discharge points on your hull side? flowing lots of water thru both units?
  13. CSkipR

    CSkipR Member

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    Only one discharge outlet and it seems to be pumping fine. About same amount of water as its always had coming out. Before someone asks the strainer is clean.
  14. Capt Ralph

    Capt Ralph Senior Member

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    I hate multi units tied to one discharge. You can never see if all units are dumping well.
    Slip an old garden hose over the discharge tube, pass the end out a port or overboard some how. Plug the hose you removed from the outlet. That outlet is usally 5/8 o/d and a larger hose should fit with out cutting off the fitting. Let that run. check water discharge from that hose and feel for that heat.
  15. C4ENG

    C4ENG Senior Member

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    One of the first things I do when I want to get an idea of a system charge or operational issues is to feel the condensing coils (the coil that the sea water runs through to cool the hot gas). They should be toasty warm (110,118F or so all depending) and they should be comfortable to hold your hand on. If they are to hot to hold then there can be a sea water flow issue. I find muscles all the time blocking tubes up. If they are cold (like 80,90F or so) then you will more than likely be low on gas.
    Of course there are always variables but 9 out of 10 and just a rough guide...
  16. C4ENG

    C4ENG Senior Member

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    I am pretty sure Capt J was referring to the fact that R22 systems are replaced by R410 systems which is correct. EPA in America has shut down manufacturing of R22 units. Most of us are not thrilled by this decision. You can no longer buy R22 internal system parts (legitimately) and you have to replace the whole unit on a small failure.
  17. Capt J

    Capt J Senior Member

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    UMMMM NO, do not put R410 in a unit meant to use R22, it is not a drop in replacement, neither is R143 for R12 (but R12>R143 can be done by changing the dryer, evacuating all of the oil from the system, and a few other small changes). What I was saying, is R410 was designed to replace R22 in units that used to be manufactured to use R22, now have to be made to use R410. R410 runs at much higher pressures both High and Low side. Unit's such as refrigerators, household air conditioners, etc etc etc now have to be manufactured for use with R410........I was trying to say that R410 was designed to replace the now not-manufactured R22, when new units are manufactured they are required to be R 410.
  18. Marmot

    Marmot Senior Member

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    Typical nonsense. An R22 system can be serviced as long as the owner is willing to pay for it. R22 can still be imported and R22 is available.

    The EPA does not require an R22 unit to be replaced or prohibit it from being repaired or refilled with R22 after repairs.

    A knowledgeable chief engineer will know the regulations so that the owner is not faced with large expenditures due to the engineer's ignorance.

    The regulations governing what can be done to an existing unit and who can perform the work are easily found. The EPA website is a good place to start. It takes less time to obtain the actual rules and regs than it does to post nonsense that might mislead others.
  19. C4ENG

    C4ENG Senior Member

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    A wiser member than me on YF told me that if I lay down with the dogs I will get flees. You guys just enjoy being rude and I am going to play fetch with you any more.
  20. Marmot

    Marmot Senior Member

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    Does that mean you are "fleeing" the scene?

    There is a better idiom than the thing about dogs, it is the one that says it is "better to remain silent ... "