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  1. #1
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,245

    Compressor Noise During Low Ambient Cooling

    I went on a call where a customer was having compressor noise issues with his York 18 SEER heat pump in cooling mode at low outdoor temperatures. I haven't had much experience with cooling at low ambient, I seemed to be able to reduced the noise a bit by raising the head pressure. If low temps are indeed the cause of the noise, is there an easy way to boost head pressure? I tried to install a low ambient kit a while back to slow fan speed but was either too stupid to make it work, or the equipment might not have been compatible.
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  2. #2
    Join Date
    Jan 2007
    Location
    Stongsville Oh
    Posts
    909
    Was it a scroll compressor and 410a refrigerant? They do get louder with low head.
    ckartson
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  3. #3
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,385
    Customer is concerned about high energy bills so he buys a 18 seer AC. Wont open windows on a cool day....

  4. #4
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,245
    Yes it is a scroll with 410a. Opening windows won't do. He works for the university and does some sort of plant research. He's got a space with some pretty decent heat load from high powered lights that run year round (and no it's not weed haha). Any help for me guys?
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  5. #5
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,245
    Double post
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,370
    That unit is not designed to be used with any type of head control. It says that in the install instructions.

    Sounds like you are getting flood back. Might want to see if you can increase the indoor blower speed to evaporate more of the refrigerant.
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  7. #7
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,072
    could installing a crank case heater help this problem?

  8. #8
    Join Date
    May 2011
    Location
    Ripley, WV
    Posts
    1,217
    Would putting a heater on the accumulator(if equipped) be an option to speed up the boiling off of excess refrigerant? Just have one on the compressor that energizes on contactor open and one on the accumulator that energizes when the contactor closes.

  9. #9
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    Don't think liquid flood is the issue here. I hope you have a txv indoors. Even then with low ambient the valve should be wide open and still have higher than design SH due to ultra low head.

  10. #10
    Join Date
    Jan 2005
    Location
    Akron
    Posts
    1,179
    I have heard a pinging noise/rattle when there is not enough pressure difference across the compressor. The scrolls will start to separate. Happens when the head is to low and the indoor air temp to high. The high efficiency of the coil becomes to high. The equipment might be outside of its design specifications.
    JLB,

  11. #11
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,245
    This unit has a factory installed crankcase heater. There is also an indoor TXV. Beenthere, I will try to increase blower speed, its certainly worth a shot. Ron, thats an interesting idea. Do they even make such a heater? Jim, I'm afraid you're probably right. At this point I'm just trying to figure out a way to raise the head pressure without getting too ghetto... Thanks for the replies fellas
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  12. #12
    Join Date
    Jan 2010
    Posts
    6,402
    What type of low ambient did you try ?

  13. #13
    Join Date
    Nov 2008
    Location
    baltimore
    Posts
    26
    A common fan cycle switch would work to control head pressure. Johnson sells a bunch of models compatiable with 410a. A hot gas bypass could also help problem with solenoid to close bypass in heating mode. A combination of both might help as well.

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