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  1. 03-15-2012, 05:15 PM #1
    Cool Change
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    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
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  2. 03-15-2012, 05:21 PM #2
    second opinion
    second opinion is offline Professional Member*
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    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?
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  3. 03-15-2012, 05:23 PM #3
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    TACKERDOWN
    TACKERDOWN is offline Regular Guest
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    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
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  4. 03-15-2012, 05:24 PM #4
    Cool Change
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    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.
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  5. 03-15-2012, 05:25 PM #5
    PM Heat n Cool
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    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
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  6. 03-15-2012, 05:25 PM #6
    Cool Change
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    I probably used a quater stick
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  7. 03-15-2012, 05:27 PM #7
    Cool Change
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    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
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  8. 03-15-2012, 05:28 PM #8
    foobee
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    try pressuring the unit back up and soap bubble your weld joints
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  9. 03-15-2012, 05:29 PM #9
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    TACKERDOWN
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    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
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  10. 03-15-2012, 05:30 PM #10
    Cool Change
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    Ok, I will again. I did hold 100 pounds of nitrogen and soap bubbled the joint before adding freon
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  11. 03-15-2012, 05:33 PM #11
    Cool Change
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    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
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  12. 03-15-2012, 05:33 PM #12
    PM Heat n Cool
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    80 pipe temp

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  13. 03-15-2012, 05:34 PM #13
    Cool Change
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    Do you have any other ideas on the hissing sound
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