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    freds49's Avatar
    freds49 Posts: 3, Reputation: 1
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    #1

    Jun 28, 2010, 12:33 PM
    Freon 410a
    I have installed a 4 ton Goodman 16seer unit using 410a. I tried to follow the book on this installation. Run gas through the pipes while brazing. New copper, 1 1/8 on return. Pulled a vacum to 40 micro, my hoses kept leaking so I used all copper pipe from guages to vacuam pump, 410 tank, to unit, took 30 hours to pull this, had 72 feet of pipe each way. I began to fill the unit with 410 and reached 150 pound of pressure. I was called away from the job becoause of family sickness, did not return for 2 weeks. The pressure was holding at 150, but my understanding is about 165 pound is needed. I also understand only one top off is allowed with 410. The unit has NOT been disconnected from the original setup. Is a top allowed at this point? The unit has/is operating at this time.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Jun 28, 2010, 05:58 PM

    How do you know it still needs more freon??
    freds49's Avatar
    freds49 Posts: 3, Reputation: 1
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    #3

    Jun 29, 2010, 12:33 PM
    Don't,have not checked super/sub.
    freds49's Avatar
    freds49 Posts: 3, Reputation: 1
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    #4

    Jun 29, 2010, 12:33 PM
    Don't,have not checked super/sub.
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