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    javylynx's Avatar
    javylynx Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 11, 2009, 02:01 PM
    Rheem Classic 90 A/C unit noise at start up only
    I have a Rheem Classic 90 , 3 years old . Started my a/c unit today and it made a noise at start up only . It was something like rrrrrrrrrrrrr, for a brief second , stopped and ran just fine after. Anybody have any clues what this might be.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 11, 2009, 02:30 PM
    It could have been a slight lack of oil/lubrication on start up. When they sit all winter it all drains down to the crank case and not much is free flowing to lube the upper end of the compressor.
    Mikie D's Avatar
    Mikie D Posts: 45, Reputation: 1
    Junior Member
    		  
    #3

    Mar 11, 2009, 04:14 PM

    One possibility if you have a line set that travels vertically to an attic liquid ref. can migrat back to the comp and cause a hard labor upon initial start and the lack of oil flow because of season start up.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #4

    Mar 11, 2009, 04:45 PM
    The unit is probably equipped with a scroll compressor. Long periods of non-use (like winter) will result in noisy initial start-up, as the scroll is in the top and the oil is in the bottom. I wouldn't be concerned if this is a seasonal one-time occurrence.
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