Page 1 of 3 123 LastLast
Results 1 to 13 of 39

Hybrid View

  1. #1
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,238

    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.
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  2. #2
    Join Date
    Jan 2007
    Location
    Stongsville Oh
    Posts
    895
    Was it a scroll compressor and 410a refrigerant? They do get louder with low head.
    ckartson
    I didn't write the book I just read it!

  3. #3
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,211
    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
    1,238
    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
    1,238
    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
    67,899
    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.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  7. #7
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,028
    could installing a crank case heater help this problem?

  8. #8
    Join Date
    May 2011
    Location
    Ripley, WV
    Posts
    1,159
    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
    6,038
    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
    1,120
    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
    1,238
    It is an ECM. I tried to install an ICM low ambient control on another heat pump before and couldn't get it to work. I followed the directions and also called their tech support line but it wouldn't go. Would a cut in/out work on the ECM? I would imagine it would.
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  12. #12
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,238
    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

  13. #13
    Join Date
    May 2011
    Location
    Ripley, WV
    Posts
    1,159
    Quote Originally Posted by LibertyTree View Post
    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
    I was thinking about one of those external crank case heaters that wrap around the compressor and tighten up like a hose clamp. Instead of being used on a compressor install it on the accumulator and set to energize when the contactor closes. Also include a temperature sensor to keep it from coming on when ambient temperatures are close to design specs.

Page 1 of 3 123 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event