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Thread: THPRE

  1. #1
    Join Date
    Jan 2013
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    TRAIL,OREGON
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    68

    Confused THPRE

    I purchased a new Goodman 16 seer heat pump,it was installed late summer of 2010. Made cool air but come winter had to remove refergerant because of high pressures. Then have to add it in the spring and remove every winter since. Installer has replace three tx valves and one drier. All to no avail. My installer knows less about refergeration theory than I do [ I am fairly knowledgable] and he does not even understand the function of a compensator. Goodman will not talk to me and they do not have a factory representitive available in our area.But we do have a telephone conference set up for the end of this week - friday.
    I would like any thoughts as to possible solutions and possibly the differences between compensators and recievers. Also what is a static regain collar and does it pertain to my situation? Thanks
    Last edited by BaldLoonie; 01-22-2013 at 05:27 PM. Reason: removed email address

  2. #2
    Join Date
    May 2006
    Location
    Philadelphia, PA
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    1,394
    What are the model numbers of the indoor coil and outdoor unit?
    Climate Control Solutions for your Home or Office

    Serving Northeast Philadelphia and Surrounding Areas

  3. #3
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,543
    What comfort doc is alluding to is the "match" of the indoor and outside equipment as your discription sounds like a mismatch. You did replace all the indoor equipment at same time didn't you? (Coil, exp. valve etc.).

  4. #4
    Join Date
    Jan 2013
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    TRAIL,OREGON
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    68
    Quote Originally Posted by comfortdoc View Post
    What are the model numbers of the indoor coil and outdoor unit?
    I not have the numbers here at work with me but Goodman did say that the two units were compatible when I had a third party check the system and advise me. Then they said they would only help the original installer. I can get the numbers tonight, Thanks , THPRE

  5. #5
    Join Date
    Jan 2013
    Location
    TRAIL,OREGON
    Posts
    68
    The complete unit was all new in 2010. Goodman claims that the two units are compatible. It is a four ton unit in a 2500 sq. ft. mobile home with extra insulation. Home has been tested for tightness and insulation --- both are very good. Had to install a power vent for air exchange. Installer has replaced the inside tx valve twice and the outside on once. Also the drier was replaced. Compensator or reciever was not replaced. Neither coil has been replaced and goodman claims they are matched.

  6. #6
    Join Date
    May 2008
    Location
    Central Fla.
    Posts
    311
    Lineset sizes would be nice too.

  7. #7
    Join Date
    Aug 2012
    Posts
    2,666
    Did they ever check static pressures and cfm?
    My name is TooCoolforschool and I am a chronic over charger.

  8. #8
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,543
    I'm not sure I've ever seen a 2500 sq. ft. mobile home. What kind of ductwork do you have and where is it installed? Does your home still have the original small aluminum ductwork sandwiched into floor bracing? Toocool is asking for static pressure for a reason if existing ductwork is being used for a 4 ton system. My guess would be excessive static pressure and inadequate air flow causing the freon problems, not the equipment. Other than the fact that Goodman does not make units rated for mobile home use (that I know of anyway). Most mobile home ductwork is grossly undersized for standard residential units.

  9. #9
    Join Date
    Jan 2013
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    TRAIL,OREGON
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    68
    We initially had lots of duct problems - they did not even have a plenum under the air handler and so flow was not good to say the least. On top of that the ducts were very leaky. Now cfm and static tests have been repeated and duct work has been modified three times and a plenum added. Air flow is finally moderately acceceptable. Cooling and heating performance is reasonable but requires different refergerant charge every season. The system has never worked even once through the change of season. I do not have with me the actuall numbers for cfm or static tests. I also do not know the copper refergerant line sixes but they are close to 5/16 liq. and 1/2 suction. I would have to measure when I get home.

  10. #10
    Join Date
    Jan 2013
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    TRAIL,OREGON
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    The home is a tripple wide approx 60 feet long. he ducts were terrible. But a plenum has been added and three aux. soft ducts 16 in. dia. have been added. These go to supply the three sections and now the air flow is satisfactory. Good man was advised of the size and heat load of this home. It does have lots of windows . A separate tester has been doing the static tests and they also made the last modification to the ducts. I think air flow is sufficient now. And remember the heating is fine and the cooling is fine but not with the same refergerant charge.

  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,174
    Post full model number of outdoor unit and indoor unit when you get home. Along with actual line set size.

    Sounds like under sized duct work, and possibly and under sized line set.
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    How many times must one fix something before it is fixed?

  12. #12
    Join Date
    Jan 2013
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    TRAIL,OREGON
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    Just keep fixing it untill my money or patience runs out!! Never mind fixing the problem! Good thing I have a good woodstove and plenty of wood.

  13. #13
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,054
    I offer 3-1 odds that the indoor coil is incorrect, even if it's a "match".
    "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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