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  1. #1

    At A Loss Here !

    I changed out my condensing unit, (a very used Goodman 10 seer), with a Nordyne 13 seer, and, the evaporator coil on the horizontal natural gas furnace with a Aspen 13 seer expansion valve cased coil.

    The condensor sits on the ground level and the ecoil is in the attic approx. 16 foot above the cond. unit. I relocated the line set to make an arc about a foot above the highest point of the ecoil case to stop off-cycle migration.

    I installed a 16 cu.in LL filter dryer at the ecoil and a sight glass at the cond. unit.

    Upon start up and charging system, in order to clear the glass it produced 95 psig suction with 275 head pressure with a very warm liquid line.

    I adjusted the charge to 175 head pressure which only resulted in lowering the suction to 80/85 psig, while flooding the compressor very badly !

    I adjusted the charge until the compressor was not flooded and the suction was in the 75/80 psig range but the suction line was not sweating back nor was the condensing cycle producing sufficiant removed heat out of the top of the cond. unit.

    The ecoil is a universal refrigerant use coil and I did check the valve to make sure it was a R-22 valve and yes it is, (green tag).

    My theory is that the sensing bulb has lost its charge, (coming this way out of the box), and the valve is stuck in the wide open position. I know of no way of proving this except to change the valve.

    btw, I am a technician with over 15 years experience in new install and retrofitting equipment, and this is on my own home.......

    Any suggestions or comments before I go to the parts store and request a "loaner" valve to prove my theory ?

    Thankx in advance,

    Ozonetrooper

  2. #2
    WOW

  3. #3
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    You have over 15 years experience and still cannot properly diagnose a failure of an expansion valve????

    You've got to frickin joking!!!!!!!!


    I feel really sorry for your customers.
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  4. #4
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,176
    This really belongs in the Professional Technical Forum. Get 15 posts, apply for professional membership and we'll help you behind closed doors where the DIY crowd can't see it.

    Please review the rules also. There are links in my signature line.

  5. #5
    Join Date
    Feb 2008
    Location
    Western NC
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    Quote Originally Posted by HeyBob View Post
    This really belongs in the Professional Technical Forum. Get 15 posts, apply for professional membership and we'll help you behind closed doors where the DIY crowd can't see it.

    Please review the rules also. There are links in my signature line.
    Hey Bob....

    That post screams DIY and a "tech" with no damn clue as to what the hell is going on.....

    I doubt closing the door is gonna help this one
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  6. #6
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,176
    Quote Originally Posted by iraqveteran View Post
    Hey Bob....

    That post screams DIY and a "tech" with no damn clue as to what the hell is going on.....

    I doubt closing the door is gonna help this one
    I didn't close the door.........I am gonna rely on the rest of you to keep things in line............so far so good except for one post and one quote!

  7. #7
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    New concept charge a unit til you hear the compressor flooding then back off a hair.This will save us all time.
    What is the deal with the sight glass?
    Last edited by RDP; 08-05-2008 at 10:18 PM.

  8. #8
    Join Date
    Oct 2004
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    PDX
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    Quote Originally Posted by RDP View Post
    New consept charge a unit til you hear the compressor flooding then back off a hair.This will save us all time.
    What is the deal with the sight glass?
    You have never charged with a sight glass? What, are you new to the trade, or something?

  9. #9
    Join Date
    Oct 2007
    Location
    south of boston
    Posts
    174
    was the bulb for expansion valve wrapped or removed before brazing?

    and was it properly evacuated ?

  10. #10
    Join Date
    Jun 2008
    Location
    NW Florida
    Posts
    707
    Come on fellas. He said 15 years on instalation. I know plenty of guys down here (we call them installers). That couldn't diagnose a bad compressor let alone a bad x-valve. They install service tech starts them up. Yall trying to run off a man on his first post.

  11. #11
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    We're not tryin to run him off...........

    We're tryin to get him to post more information.



    As far as a sight glass...it is practically useless in residential applications. Only time I've seen them is on larger units with extremely odd installation applications.
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

  12. #12
    Join Date
    Oct 2004
    Location
    PDX
    Posts
    4,917
    Quote Originally Posted by iraqveteran View Post

    As far as a sight glass...it is practically useless in residential applications. Only time I've seen them is on larger units with extremely odd installation applications.
    It used to be, at one time, that was how you charged a system. If you look around on multi-family dwelling and commercial, they are used eveywhere to this day. Even on smaller units, like 1 1/2 ton units.

  13. #13
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    Quote Originally Posted by oloenneker View Post
    It used to be, at one time, that was how you charged a system. If you look around on multi-family dwelling and commercial, they are used eveywhere to this day. Even on smaller units, like 1 1/2 ton units.
    I know I know. I work in refrigeration. They are everywhere on refer units and Commercial systems.

    But when it comes to the smaller residential heat pumps, Superheat and Subcooling readings will go a lot further than a sight glass. On these systems, a sight glass is nothing more than 2 more joints that could start leaking.


    Let's get one thing straight, I am by no means bashing the OP. Its hard to believe that over 15 years experiences yields no knowledge of service. If he is a pro, I would encourage him to get pro status. A lot can be learned. But on the other hand, if one hasn't learned in over 15 years, whos to say they would be willing to start now???
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

    If you do know, then do. But do it right. Otherwise, you may not be doing it long.

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