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  1. #14
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,676
    i would put a xr13 heat pump on it, would probably be 14 seer and would be a matched system
    We really need change now

  2. #15
    Join Date
    Aug 2010
    Location
    West Monroe, LA
    Posts
    1,535
    Quote Originally Posted by jtrammel View Post
    basically yeah, It will can use a different speed for heat mode, ac mode and continuous fan. Most newer equipment comes with a variable speed blower motor (x13 or ECM) and they use less power to operate than a traditional fixed speed or multispeed PSC (permanent split capacitor) motor. VS air handlers are used all the time on single stage hp, their are little savings in a 2 stage heat pump it is used mainly for increased comfort rather than a return on investment over a single stage unit.
    I agree with this statement! I install a lot of variable speed air handlers and furnaces with single stage heat pump and condensers. I recommend this for energy savings, better humdity control, quietness and helps with hot and cold spots just to list the main reasons. A proper sized system with variable speed indoor unit and single stage outdoor unit is ideal for most applications.


    Quote Originally Posted by catmanacman View Post
    i would put a xr13 heat pump on it, would probably be 14 seer and would be a matched system
    Agreed! I think the last XR 13 head pump I installed with that air handler was rated at 14 seer plus. It all depends on the size heat pump you have outside as well. To original poster. What size heat pump will be installed?

  3. #16

    Confused

    Quote Originally Posted by duckman06 View Post
    Agreed! I think the last XR 13 head pump I installed with that air handler was rated at 14 seer plus. It all depends on the size heat pump you have outside as well. To original poster. What size heat pump will be installed?
    2-ton after insulation/window updates after home energy audit.

    I'm still confused though? I probably missed something along the way, but, what good does a VS AH do for you if your HP is a single-stage? Heat or cool mode?

  4. #17
    Quote Originally Posted by mark beiser View Post
    Yes, it would work. Most likely it would work quite well.

    The problem is that it is anyone's guess as to what the actual efficiency and capacity of the resulting system would be.
    I must be way underestimating the importance of the AH-HP relationship.

  5. #18
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Quote Originally Posted by SqueakyDog View Post
    I must be way underestimating the importance of the AH-HP relationship.
    The recommended and best practice, and even legal requirement in some areas, is to stick with rated and/or manufacturer approved matched equipment.
    That way you always know what you will end up with for efficiency and capacity, and it protects you from situations where the equipment may not work properly.

    For the most part, every manufacturers equipment follows very similar/same design principles, and are using the same or similar compressors and other parts.
    In this case, the coil in your air handler was designed for use with very high efficiency heat pumps, and has a large coil, with plenty of internal volume to handle operation in the heating mode with pretty much any 1.5 to 2.5 ton conventional single or 2 stage heat pump, and many lower efficiency 3 ton heat pumps.

    There wouldn't be any operational issues at all, but there isn't any knowing what the actual efficiency and capacity of the match will be.

    While there are any number of air handler and heat pump combinations that will not work properly, in both heating and cooling, without seasonal refrigerant charge adjustments, the coil volume ratio issue that causes it will not be an issue with the equipment you listed.
    If more government is the answer, then it's a really stupid question.

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