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  1. #1
    Join Date
    May 2006
    Posts
    54

    groaning noise at compressor startup

    Hi,

    I had a 3.5 ton 14 SEER Amana RCE36C2C compressor installed as part of a new system a year ago. At the time, I thought it was kind of loud at startup. It makes a loud groaning noise until it gets up to speed, then runs quietly. I asked the contractor about this and he said it was normal.

    Is it normal for an AC compressor to be noisy at startup? Is this hard on the motor or compressor? Is this something a hard-start capacitor could potentially help?

  2. #2
    Join Date
    Nov 2004
    Location
    Naples, Fla.
    Posts
    1,403
    Your RCE36 is a nominal 3 ton, not 3.5T, a RCE42 would be a 3.5T

    The RCE series uses scroll compressors & they do make a different sound on start up.

    A hard start kit will reduce wear & tear on the compressor & is required if your unit is matched w/ a TXV coil. The RCE is ONLY rated w/ TXV coils.

    Follow your contractors advice.

  3. #3
    Join Date
    May 2006
    Posts
    54
    Quote Originally Posted by coolguysfl View Post
    Follow your contractors advice.
    My contractor gave me no advice as to the presence/absence of a hard start kit, or it's required installation in my model compressor when matched with the correct TXV coils you mention. Is there anything in particular different about 'TXV' evaporators? The evaporator installed is a Goodman CAPF3636B6AA.

    If the noise is normal, fine. But it certainly can't be helping wear, and if there is an option that would improve this otherwise-quiet compressors operation I would like to look into it.

    If my compressor motor is not equipped with a start capacitor, can I improve start performance and decrease noise by adding one?

  4. #4
    Join Date
    Apr 2001
    Posts
    669
    Quote Originally Posted by lifespeed View Post
    The evaporator installed is a Goodman CAPF3636B6AA.
    I'd better get my Goodman service truck ready.

    <pic removed>

    Jabs
    Last edited by jrbenny; 08-26-2007 at 05:17 PM.

  5. #5
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,910
    Twilli thinks all Amana's been groaning since they were bought by Goodman
    No Heat No Cool You need Action Fast

  6. #6
    Join Date
    Nov 2004
    Location
    Naples, Fla.
    Posts
    1,403
    I'd call the contractor back ----- let HIM validate the coil is an approved match.

    BTW -- with the nomenclature, the F in the coil means Flow-rater, no TXV unless the contractor added it on.

  7. #7
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    the noise you hear at start up may be a hermonic vibration from the compressor witch is common with a scroll compressor. This noise can be escalated it the refrigerant lines are strapped to the beams. If the smaller line is touching the wood or cement the noise can be transmitted to the house and can be in some cases quite loud.

    ask your contractor to check and isulate the lines if possible
    if this is what is causing the loud noise

  8. #8
    Join Date
    May 2006
    Posts
    54
    Quote Originally Posted by coolguysfl View Post
    I'd call the contractor back ----- let HIM validate the coil is an approved match.

    BTW -- with the nomenclature, the F in the coil means Flow-rater, no TXV unless the contractor added it on.
    So the expansion valves are different? Obviously he believed the coils were correct, or he wouldn't have put them in.

    Let me get this straight: you believe that the RCE36 should only be used with a TXV expansion valve, not the flow-rate valve in my evaporator? Is this stated somewhere in the Amana literature? It would be good to have some documentation when speaking with the contractor.

  9. #9
    Join Date
    Sep 2006
    Posts
    41

    Hmm

    Why do you say you have a 3.5 ton unit the 36 in both numbers match and that is a 3 ton unit .I would check your contract and then talk to the contractor.

  10. #10
    Join Date
    May 2006
    Posts
    54
    Quote Originally Posted by fixhvacr View Post
    Why do you say you have a 3.5 ton unit the 36 in both numbers match and that is a 3 ton unit .I would check your contract and then talk to the contractor.
    The contractor stated he was going to install a 3.5 ton. Apparently he installed a 3 ton.

  11. #11
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,043
    Where is indoor coil?

  12. #12
    Join Date
    May 2006
    Posts
    54
    Quote Originally Posted by BaldLoonie View Post
    Where is indoor coil?
    Furnace (Amana AMS95) is in the garage, draws through the side from the house, blows up through the evaporator into the ducts in the attic.

  13. #13

    RE: growning sound

    First of all is the reason for the hard start kit is the TXV has a equilizing line that shuts the refrigerant flow off during off cycle. During start up the compressor has to overcome the inercia of the lack of equalization. there for the noise. Requiring the hard start Kit. The kit gives the conpressor the extra boost needed to get the compressor past the hump of locked rotor amps.

    Checking the superheat of the unit would be wise. If liquid is feeding back to the system durring the run cycle. this would also be the symptom that you describe.

    Also take note of your units run time. Does it cool? Does it short cycle?

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