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  1. #1
    Join Date
    Nov 2007
    Posts
    47

    1-1/8'' Suction Line

    Goodman GSH130481AA Heat Pump specifications call for a 1-1/8'' suction line size (O.D.). Can an already in place 7/8'' line be used without ANY problems? What problems are possible from an undersized suction line?

    Thanks,
    TLY

  2. #2
    Join Date
    Jan 2008
    Location
    Hells Kitchen, Phoenix Arizona
    Posts
    318
    usually but not always its ok...Im not sure about goodman but other units have piping charts...
    "Overkill is an often underrated achievement", Will Hayden -- Red Jacket Firearms

  3. #3
    Join Date
    Dec 2007
    Location
    Ohio
    Posts
    2,875
    Better refer to the sizing charts...if it says you need to use 1 1/8 line then you probably should. Not only for proper opperation, but also for any kind of warranty situation that you may see in the future. And no I am not bashing Goodman, they are great units!
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  4. #4
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
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    18,836
    Check the mfrs. specs,might just be a 3% capacity loss.

  5. #5
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Quote Originally Posted by dash View Post
    Check the mfrs. specs,might just be a 3% capacity loss.
    That is about it.

    How long is the lineset?
    Government is a disease...
    ...masquerading as its own cure…
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  6. #6
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,829
    I agree. Know what the load is and if the unit has some excess capacity, you're probably okay. Check the man's specs.
    If YOU want change, YOU have to first change.

    If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

  7. #7
    Join Date
    Nov 2007
    Posts
    47
    Quote Originally Posted by RoBoTeq View Post
    How long is the lineset?

    The lineset is 50 feet.

  8. #8
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Quote Originally Posted by TLY View Post
    The lineset is 50 feet.
    Should not be an issue.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  9. #9
    Join Date
    Nov 2007
    Posts
    47
    If a suction line is too small will it cause any noise problems or will it only affect efficiency?

  10. #10
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,923
    Quote Originally Posted by TLY View Post
    If a suction line is too small will it cause any noise problems or will it only affect efficiency?
    As long as you are only dealing with vapor, which is all you should be dealing with in that line, I have never come across any sound issues with a smaller suction line.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  11. #11
    Join Date
    Jun 2007
    Location
    Metro St. Louis
    Posts
    181
    Up until recently, Goodman wanted 7/8". For example, in September, the ASZ heat pump I have was spec'd at 7/8". In October, they updated the specs to 1 1/8". I'm not sure why they moved up (Robo might know), but if it was good before, I'm sure it would be fine now. Perhaps not optimal...

  12. #12
    Join Date
    Nov 2007
    Posts
    47
    Quote Originally Posted by Waterloo View Post
    In October, they updated the specs to 1 1/8". I'm not sure why they moved up (Robo might know)
    Well, it must have impacted something in a significant way. That is an increase of 33%. (3/4'' nominal to 1'' nominal) I would be interested to know what problems were solved or what efficiencies were increased by changing this specification.

    Specifications are a funny thing...some say they are of no real significance and some say they are critical...still confused.

    TLY

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,721
    By itself, its not much of an impact.

    If all other operating parameters are off alittle, it could make a big difference.
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