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  1. #1
    My house is just over 2.5 years old and the AC has worked beautifully for 2.25 years. In May I noticed that the system seemed to struggle to get the temp down below 78 - 79 and runs constantly until about sundown. I called out the original installers, who determined that the evaporator coil was leaking and it would have to be replaced. I'll leave out the unnecessary details regarding the nearly two weeks of multiple problems in getting the coil installed, (cracking drain pan, replacing expansion valve, shorting out the thermostat, etc..) After all this, the system seems to be doing the same thing it originally was before I called them, running constantly until around 8:30 - 9:00 PM. I have the system set for 77 throughout the day and drop down to 75 after 3:30.

    Heat Pump with Puron R410A
    Bryant Model: 633AJX048000AAAA ( I believe 4 ton, 12 SEER )

    The house is 2150 sqft with 10 - 12 ft ceilings throughout.

    In Florida.

    I would think with a 4 ton unit running properly, there should be no reason it can't get the house down to 72 - 73 if we wanted.

    Does anyone have any ideas?

  2. #2
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Could you get it to 72 ,on a hot day in the past??


    Most new construction homes are designed for 78 or 75,in Florida.They can usually do a little beter then design ,but if designed for 78,it's not likely to get to 72,on a 90 plus day.

    A lot of new homes are built with single pane glass and minimal insulation,so 4 ton could be needed to get to 77.Depends on the construction.

    There could unfortunately be something else wrong,have they come back to check it out?

  3. #3
    Join Date
    Nov 2004
    Posts
    2,927
    Originally posted by big chill
    Does anyone have any ideas?
    What is the level of humidity in your house?(relative humidity%,or wetbulb*)

    An old old timer once told me ,"that the evaporators first job was to remove moisture from the air,and then to cool the air."
    Maybe that is part of the problem.Too much of your 4 tons is being used for lowering reative humidity...could be infilration caused be kids coming in and out alot,leaks in ductwork,long setbacks of thermostat,ect..

    Or maybe that oldtimer was just full of bull-ony.

    Dash,what do you think?

  4. #4
    Yes, but I haven't really had to have it that cool very often and I'm not sure exactly how hot it was outside when it did get that cool.

    It just seems like it's not working as well since they worked on it. They have been back 3 or 4 times over the two week period to fix one thing or another. I'm just not very comfortable that they did everything correctly. There were five different technicians at my house during that period and I was comfortable with maybe two of them. Needless to say I wasn't seeing eye to eye with their dispatchers / service managers after two weeks of hell. I wan't to make sure it isn't working properly before I jump the gun and have them come back out.

  5. #5
    Jacob,humidity is around 52 - 53.

    No, kids, and very little in and out throughout the day. The best I can tell no leaky ducts. Settings on thermostat haven't changed....

  6. #6
    Join Date
    Nov 2004
    Posts
    2,927
    Originally posted by big chill
    Jacob,humidity is around 52 - 53.

    Well then,that means alot in Florida.50% is good in my book.(Maybe too good.)The unit is at least doing that much.

    Only thing I can think to say has been stated:It might not be designed to get down to 72 degrees.
    Sometimes there are compounding complexities of multiple variables that are not intuitively obvious

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,196
    But if he says it worked beautifully for 2.25 years, it's gotta be sized right. Something has changed. After the coil change, did they get it evacuated and charged right? If it isn't cooling like it did, they ought to be able to find out why.

  8. #8
    Join Date
    Nov 2004
    Posts
    2,927
    Originally posted by BaldLoonie
    find out why.
    Okay.Maybe the electric strips are activated...

    B'chill,has your energy bill been consistant with previous years,or have you had a noticable increase in kilowatt use?

  9. #9
    They drew everything out, made the change and then recharged the system. They seemed to have a slight bit of trouble with the sub-cooling while they were checking it. I don't think it ever got to where they exactly wanted it. Is it charged right??? The two techs that were there seemed to think so.

  10. #10
    Join Date
    Nov 2004
    Posts
    2,927
    Did they use new refrigerant after repairing the coil leak?
    Did you notice the color of the drum the refrigerant came out of when recharging?

  11. #11
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    did they install a new liquid line filter dryer as required every time you havew to open a r-410a system.
    this dryer will hold moistur and can cause a lot of problems while chargeing if not replaced. any time a system charge is removed and the lines are opened to air and moisture the filter dreyer must be replaced.

  12. #12
    Join Date
    Dec 2004
    Location
    Derby City
    Posts
    3,964

    Hmm

    Hate to repeat myself but I don't see where anyone has asked the obvious question. Was a load calculation ever performed on this house? THAT is the ONLY definitive manner to determine if the capacity is correct. Also the air distribution system should be checked for proper sizing and airflow. If these criteria have been satisfied properly, and the problem persists, then start looking at possible mechanical causes. Depending on the design conditions, i.e. outdoor temp., temperature difference, etc. used in the course of the calculations, you will be able to determine if the size is correct. If in fact, the system is correctly sized, then I would start looking for a mechanical issue. If you don't get satisfaction from the contractor, ask for a factory representative (not his service manager or sales manager) to inspect the system. Most major manufacturers are more than willing to get involved, and Bryant is certainly a major player. They will probably want the contractor present, but that should not be a problem. Good luck. p.s. I can't emphasize enough, the importance of the load calculation being done.
    Everyone has a purpose in life..........even if it's to be a bad example.

    Seek first to understand, before seeking to be understood.

  13. #13
    Join Date
    Apr 2004
    Posts
    7,680
    Setting the thermostat for 77 during the day and then trying to lower it to 75 while still in the hottest part of the day will take all you got and then some. These units are designed to maintain temperature even when it is in the 90's but asking it to pull down a house may be just over the edge. Try leaving it on 75 all day.

    If your not confident its repaired then call the service manager back and ask that he come with a technician to ecxamine the system. Surely he is aware of the problems they have had over the past two weeks.

    Also, depending on where you live you may have suffered some damp insulation or even some that was blown around in last years h'canes which may have changed the load on your home. I would at least look up there to see if thats possible.

    BTW, you got another one heading your way now.

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