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Thread: 17EX/17FA R22

  1. #1
    Join Date
    Feb 2007
    Location
    Baltimore MD ( Balimer, Murilyn)
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    140

    17EX/17FA R22

    Anybody ever replace the drive end bearing on a 17FA R22 compressor? Can it be accessed through the bearing inspection cover or must the compressor end cover be removed?

  2. #2
    Join Date
    Dec 2006
    Location
    Somewhere in Canada
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    84

    Additional information is needed

    The 17EX chiller is a relative new unit while the 17FA could be a very old unit and anywhere up to 10,000 tons. More details on the actual unit are required because some can have their bearing replaced throught the inspection access cover while others due to their size and weight (shaft) it is almost impossible. The unit frame size will dictate if you can or it would be more responsible to not take a chance and do complete compressor overhaul.

  3. #3
    Join Date
    Feb 2007
    Location
    Baltimore MD ( Balimer, Murilyn)
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    140
    It's a single shaft 17FA R22 unit, meaning it's externally geared. Circa 1991.
    Don't have model number in front of me, guessing approximately 1500 tons.

  4. #4
    Join Date
    Dec 2006
    Location
    Somewhere in Canada
    Posts
    84

    Confused ....

    Your responds has me a little confused, if this compressor is externally driven with an external speed increaser as stated it will most likely be of the Carrier 17MA, PA or SA variety. This is a completely different can of worms.

  5. #5
    Join Date
    Dec 2008
    Location
    Dixiana, AL
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    2,611
    Now I'm confused - I thought all 17 series Carriers were open drive.

  6. #6
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
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    516

    Which one do you have

    As far as I know all the 17 series are open drive, which unit do you have, this one.

    http://www.docs.hvacpartners.com/idc...t/17fa-4ss.pdf

    Or this one?

    http://www.docs.hvacpartners.com/idc...t/17ex-1ss.pdf

    I'm got a 17S apart right now and the journal bearings are replaceable through the inspection covers but it's a completely different beast.

  7. #7
    Join Date
    Feb 2007
    Location
    Baltimore MD ( Balimer, Murilyn)
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    140
    To clarify:
    Yes all 17 series Carrier chillers are open drive. The original 17FA's had no speed increaser or gear box external to the compressor. The transmission was internal in the compressor shell. The later R22 compressors were of the single shaft variety, the speed increase done externally so only one shaft was found inside the compressor shell. That's the animal I've got. One shaft, no internal transmission. The drive end bearing is bad, concentricity way out. Do I need to pull the compressor end cover off or can I remove the drive end bearing through the inspection cover?
    I was told this type of compressor was used on the 17EX, but I've never seen a 17EX so I can't vouch for the veracity of the statement.

  8. #8
    Join Date
    Feb 2007
    Location
    Baltimore MD ( Balimer, Murilyn)
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    140
    Checked the pdf docs.
    No clear picture in the 17FA SOM Manual, however the 17EX SOM is dead on.
    The question is can the seal end journal bearing be replaced through the inspection cover?

  9. #9
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
    Posts
    516
    Look at page 2 and 7 of this link, it claims large inspection covers for ease of bearing inspection without compressor disassembly which I assume would also include replacement (in order to inspect the bearing you have to be able to remove it in my mind). The difficult part might be rigging a means of supporting the shaft or at least relieving some of the weight so you can spin out the bottom half of the split journal bearing. Take this as speculation on my part from looking at this compressor on paper only, I don't have this style at any of my sites and the 17 series I do work on have a split casing with journal bearings on both sides of the wheels, and those bearings are easily changed through the inspection covers.

    http://www.xpedio.carrier.com/idc/gr...t/17ex-1pd.pdf

  10. #10
    Join Date
    Dec 2006
    Location
    Somewhere in Canada
    Posts
    84

    Appreciation

    Thanks for the education, it has been very interesting.

  11. #11
    Join Date
    Feb 2007
    Location
    Baltimore MD ( Balimer, Murilyn)
    Posts
    140
    Thanks Nyrb. Looks like a do-able job. Any job can be done... it just needs to be done economically. Carrier Literature is so damned confusing as to the 17FA/17EX model differentiation. You pull up a parts catalogue or list for the 17FA and only the internally geared machines are listed.
    Hopefully replacing the seal end bearing will bring our concentricity back to spec.

    I'm grateful for your help and hope I can be of service to you soon.

  12. #12
    Join Date
    Jan 2005
    Posts
    605

    1974 vintage 17FA

    The one I did last week was an older model than the one you speak of, it had an internal tranny.
    The drive end bearing was behind the seal and only the seal had to be removed to change the bearing.

  13. #13
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
    Posts
    516
    Hey Carrene, we haven't seen your face around A-burg in a while, I bet you miss it badly, Wayne says hi.

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