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  1. #1
    Join Date
    Jun 2013
    Location
    Northeast Wi
    Posts
    122

    Non-condensables and iced up coil

    If a small amount of moisture is in the system how long before it shows up? Had one yesterday, there was a combination of problems, 410a, clean filter blower and evap, and was installed in a rain storm. Low suction 110psi, odt 82 highside 295. This is a new install 5 weeks old. I figure install didnt check the charge and i added a little. Suction stayed the same liquid moved between 320 and 550. I shut down recovered, check the piston and weighted in the posted charge. Suction 110 liquid 300. Checked airflow the house has 2 8x24 returns 9 supplies are 5" runs off the duct. I removed the blower adjusted belt tension and ran with the blower door off. Pressures increased. Informed the customer about the issues. Was the swing in pressure from moisture, a slight over charge or lack of air flow?

  2. #2
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    5,665
    Probably lack of airflow. Where'd you find a resi split with a belt drive blower that's only 5 weeks old?

  3. #3
    Join Date
    Jun 2013
    Location
    Northeast Wi
    Posts
    122
    The cust has an old oil furnace still. The gas line is going in next month. Then a new gas furnace. I think we are doing the furnace install. Im not sure why we just didnt install a furnace at the same time. We can alway run the gas line later.

  4. #4
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    3,958
    Quote Originally Posted by jtrammel View Post
    Probably lack of airflow.
    +1. Is the old belt drive blower capable of delivering the required airflow for the AC?
    Ductwork may also be too small, seems to be a common issue.

  5. #5
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
    Posts
    3,192
    had one few weeks ago w/ moisture.

    only knew because saw droplets of water inside fitting when pulled piston out
    Col 3:23


    questions asked, answers received, ignorance abated

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