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  1. #1
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34

    Replace evaporator coil

    Hi guys,
    Im new in the industry and new on this site.
    I installed an evaporator coil in an upflow unit. After charging with a few pound of r22 and turned on the ac to start doing superheat and subcool reading to adjust the freon levels I noticed a hissing sound near the line drier I installed about 4 feet from the air handler. The unit was holding pressure when I tested when I pressure tested with nitrogen and I maintained pressure in the gauges so I am sure it is not a leak. I am wondering if I got too much solder in the line and that is causing an obstruction in my attempt to make sure I had good joints. Tell me what you think

  2. #2
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by Cool Change View Post
    Hi guys,
    Im new in the industry and new on this site.
    I installed an evaporator coil in an upflow unit. After charging with a few pound of r22 and turned on the ac to start doing superheat and subcool reading to adjust the freon levels I noticed a hissing sound near the line drier I installed about 4 feet from the air handler. The unit was holding pressure when I tested when I pressure tested with nitrogen and I maintained pressure in the gauges so I am sure it is not a leak. I am wondering if I got too much solder in the line and that is causing an obstruction in my attempt to make sure I had good joints. Tell me what you think
    How would you get to much solder in the joint?

  3. #3
    Join Date
    Jan 2009
    Location
    Etters PA.
    Posts
    500
    I think that would be an awful lot of solder if you have a restriction it should show up on your gauges

    Sent from my PC36100 using Tapatalk

  4. #4
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34
    Not sure, was just thinking maybe some dripped into the pipe. I pushed a lot in there. Was reaching I guess because I didn't know any other reason there would be a hissing sound other than a leak which it is not.

  5. #5
    Join Date
    Jan 2010
    Posts
    79
    If you have a restriction you would notice a temperature drop across the drier not to mention probably see something in your pressures superheat and subcooling.

    Sent from my SPH-D710 using Tapatalk

  6. #6
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34
    I probably used a quater stick

  7. #7
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34
    I had to shut it down for the day but I was getting only 45 pounds on the low and about 80 degrees before I left so I was very confused

  8. #8
    Join Date
    Aug 2011
    Location
    sherman tx
    Posts
    27
    try pressuring the unit back up and soap bubble your weld joints

  9. #9
    Join Date
    Jan 2009
    Location
    Etters PA.
    Posts
    500
    Quote Originally Posted by Cool Change View Post
    I probably used a quater stick
    you should only need as much as it takes to wrap around the pipe

    Sent from my PC36100 using Tapatalk

  10. #10
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34
    Ok, I will again. I did hold 100 pounds of nitrogen and soap bubbled the joint before adding freon

  11. #11
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34
    you should only need as much as it takes to wrap around the pipe

    Sent from my PC36100 using Tapatalk

    Yes I know your right about that but since it was my first time soldering since school and my first real job I was a little paranoid and jammed a lot in there

  12. #12
    Join Date
    Jan 2010
    Posts
    79
    80 pipe temp

    Sent from my SPH-D710 using Tapatalk

  13. #13
    Join Date
    Mar 2012
    Location
    Raleigh, NC
    Posts
    34
    Do you have any other ideas on the hissing sound

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