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  1. #1
    Join Date
    Feb 2007
    Location
    Bellingham, WA
    Posts
    115

    What should the output temperature be?

    I have a 3 ton York Affinity HP with a 3 ton indoor coil. If the manufacturer's specs state that if:

    1. The air temperature entering the outdoor coil is 40F;
    2. The air temperature entering the indoor coil is 70F; and
    3. The CFM is 1400

    Then the air going into the duct system should have 34.4 MBTUH. What range of temperatures should be measured at the supply registers? For my home I am getting 73F when the HP first starts up and 66F soon after. I think that there is a problem here?

  2. #2
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,086
    Quote Originally Posted by jechow View Post
    I have a 3 ton York Affinity HP with a 3 ton indoor coil. If the manufacturer's specs state that if:

    1. The air temperature entering the outdoor coil is 40F;
    2. The air temperature entering the indoor coil is 70F; and
    3. The CFM is 1400

    Then the air going into the duct system should have 34.4 MBTUH. What range of temperatures should be measured at the supply registers? For my home I am getting 73F when the HP first starts up and 66F soon after. I think that there is a problem here?
    Going by the numbers you gave, and predicated that the system is indeed cranking out 34,400 BTUH with 70 degree return air, you should see around 93 degrees leaving the indoor coil. That's at the coil. The supply register temperature will likely be lower if the duct runs are in a non-heated area, such as an attic or crawl space.

    Even with 93 leaving the coil, 73 to 66 at the register is way too low. If you have 70 going in and 66 coming out, you're actually cooling the air. That's not good for a heat pump that is supposed to be adding heat to the air, not removing it.

    You need to have your system serviced by a competent pro. Have him check the ductwork as well.

  3. #3
    Join Date
    Feb 2008
    Location
    Everett, Wa.
    Posts
    88
    Yes it sounds like you got a problem.

  4. #4
    Join Date
    Jul 2006
    Location
    Southern Ca, Elkton Md
    Posts
    7,566
    With temps like that you might want to switch to emergency heat and call someone to come out. Your not going to heat your house if your #s are correct, so you are cooling house down enough intil aux heat kicks in then your fighting against the cold hp.

    Try wasting as less of electric as you can.
    "Correct Installation is the Key"

    .1 has killed more HX then Rush Limbaugh

    What is your TESP?

  5. #5
    Join Date
    Feb 2007
    Location
    Bellingham, WA
    Posts
    115
    Has anyone diagnosed a similar problem? What is most likely the issue? Could it be too much or too little freon? Could it be a damaged A-coil or HP compressor?

  6. #6
    Join Date
    Feb 2007
    Location
    18951
    Posts
    1,593
    Similar problems are diagnosed all the time. Your particular problem needs to be diagnosed by a technician at your home.

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,792
    Several things can cause that to happen.

    The first thing is a dirty air filter.
    If its something other then that, you need a tech to check it out.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #8
    Join Date
    Dec 2007
    Posts
    89
    check charge

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,792
    He's the home owner.

    He shouldn't be checking the charge.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  10. #10
    Join Date
    Feb 2007
    Location
    Bellingham, WA
    Posts
    115
    The person who installed the system is coming over. When he comes over, I will make sure that he checks the charge. Thanks MrFixIt39.

    By charge, you means pounds of freon in the system. Correct?

  11. #11
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,396
    My old King is a purring along. It's 25 out and with 450 CFM/ton airflow she's putting out air 24 warmer than going in. Not bad.

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,792
    Quote Originally Posted by BaldLoonie View Post
    My old King is a purring along. It's 25 out and with 450 CFM/ton airflow she's putting out air 24 warmer than going in. Not bad.
    Yea, but you got your stat set at 60*, some people like it a bit warmer in the house.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  13. #13
    Join Date
    Feb 2007
    Location
    Bellingham, WA
    Posts
    115
    My home originally had a furnace. I replaced the furance with a duel fuel HP system. The installer is saying that the reduced output temperature at the registers (as descirbed above) is due to my undersized ducts.

    Does this make sense? If this is true and we assume that the HP system is working properly, where did the heat energy from the A-coil go?

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