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  1. #1
    Join Date
    Aug 2011
    Posts
    7

    5 ton efficientcy loss running a 3/4 vapor line

    I have a Lennox xc17 running on a 3/4inch 40foot run to coil. Lennox recommends at least 7/8 inch and the vapor connection at compressor is 1 1/8 inch.

    How much efficientcy am I losing and will this shorten the life of the compressor.

    Ty.

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,968
    See my newer post.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  3. #3
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,968
    May be more than that, I just look at my mfg. site, with Ruud 3/4" is not even optional for 5-ton only 7/8" for suction is.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  4. #4
    Join Date
    Jun 2008
    Location
    phoenix az
    Posts
    24
    Perfect example of why im not a lennox dealer. To answer your question, it will work but you'll probaly go through compressors like toilet paper.

  5. #5
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,383
    Quote Originally Posted by hvacguru69 View Post
    Perfect example of why im not a lennox dealer. To answer your question, it will work but you'll probaly go through compressors like toilet paper.
    And why would that be?
    Make your expertise uniquely valuable.

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  6. #6
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,579
    With R 410 the losss will be minimal. Maybe 2-3 psig which is not that much on that gas. R-22 you may see 3% or more loss in efficiency. Your compressor will not care of the suction is a couple of pounds lower due to line loss.
    Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced

  7. #7
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,383
    Quote Originally Posted by Freezeking2000 View Post
    With R 410 the losss will be minimal. Maybe 2-3 psig which is not that much on that gas. R-22 you may see 3% or more loss in efficiency. Your compressor will not care of the suction is a couple of pounds lower due to line loss.
    And will have better oil return!
    Make your expertise uniquely valuable.

    Make your influence uniquely far-reaching.

  8. #8
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,014
    I'd say you'd have decreased capacity loss, not efficiency loss.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

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