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  1. #1
    Join Date
    Sep 2011
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    12

    Armstrong Central Air

    Hi Guys,
    I was hoping someone could steer me in the right direction. A reputable installer installed a replacement loft a/c unit in my home. My home calls for 2.5 tons of cooling. They installed a 13ACD-030 outdoor unit (r22 says 2.5ton on the side). They had a lot of problems getting a coil that day to match and ended up bringing an EM1P23BG and installed it with an "expansion valve". My reading says this is a 2 ton coil. This doesn't sound right to me.......

  2. #2
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,946
    I don't have Armstrong info, but I can tell you that the expansion valve gives the best results in any AC system. The alternative method is a fixed orifice that cannot respond to changes in load.

    An Armstrong guy should be along any minute....
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  3. #3
    Join Date
    Sep 2011
    Posts
    12
    Thanks, I look forward to getting some info. It just doesn't seem right to install a 2.5 ton compressor with a 2 ton evap coil. Especially when I read that they make a 2.5 ton coil for his unit. I'm just not sure if this "expansion valve" makes up for the smaller coil.

  4. #4
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,946
    Quote Originally Posted by htrk1 View Post
    Thanks, I look forward to getting some info. It just doesn't seem right to install a 2.5 ton compressor with a 2 ton evap coil. Especially when I read that they make a 2.5 ton coil for his unit. I'm just not sure if this "expansion valve" makes up for the smaller coil.
    Expansion valves are not intended to "make up" for anything. They are designed to regulate the superheat of the vapor leaving the evaporator. They are the best way to meter refrigerant into a typical residential system.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  5. #5
    Join Date
    Sep 2011
    Posts
    12
    Thanks, I'm anxious to see what everyone's opinion on a 2.5 ton compressor and a 2 ton Evap coil is.....Especially when my home calls for 2.5 tons of cooling.

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,931
    I would not find that coil appropriate for a 2.5 ton outdoor unit.

  7. #7
    Join Date
    Jan 2011
    Location
    Ward, Arkansas, United States
    Posts
    820
    For what it's worth the ARI #4560774 is a match system. When we were Lennox dealers for 10 minutes I noticed they had some odd matchups. Armstrong probably isn't much different.
    "Gentlemen. You can't fight in here. This is the War Room!"-Dr. Strangelove (1964)

  8. #8
    Join Date
    Sep 2011
    Posts
    12
    Quote Originally Posted by Hunter844 View Post
    For what it's worth the ARI #4560774 is a match system. When we were Lennox dealers for 10 minutes I noticed they had some odd matchups. Armstrong probably isn't much different.
    Thanks, I sent an email to Allied air through their website. I called but the recording said they were at lunch, LOL! (11:30 to 1pm EST)....I'm hoping they can clarify it for me.

  9. #9
    Join Date
    Jan 2011
    Location
    Ward, Arkansas, United States
    Posts
    820
    Quote Originally Posted by htrk1 View Post
    Thanks, I sent an email to Allied air through their website. I called but the recording said they were at lunch, LOL! (11:30 to 1pm EST)....I'm hoping they can clarify it for me.
    My mistake...that's not a match system. The EM1P24A would have been a match.
    "Gentlemen. You can't fight in here. This is the War Room!"-Dr. Strangelove (1964)

  10. #10
    I just spoke with an Allied Air tech and this match-up is decidedly a good match. Your coil falls with in the required 154 to 273 cui required coil volume.

  11. #11
    Join Date
    Sep 2011
    Posts
    12
    Quote Originally Posted by MrParts View Post
    I just spoke with an Allied Air tech and this match-up is decidedly a good match. Your coil falls with in the required 154 to 273 cui required coil volume.
    Thanks you very much! I was just concerned that I would have reduced cooling capacity on very hot days. The house was spec'd for 2.5 tons of cooling.

  12. #12
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,058
    Quote Originally Posted by htrk1 View Post
    Thanks you very much! I was just concerned that I would have reduced cooling capacity on very hot days. The house was spec'd for 2.5 tons of cooling.
    I would still ask the contractor for performance data on that match.

    Armstrongs website has that coil listed as a 1.5 -2 ton.
    It could be a listing error but I would still ask.

  13. #13
    Join Date
    Sep 2011
    Posts
    12
    Quote Originally Posted by second opinion View Post
    I would still ask the contractor for performance data on that match.

    Armstrongs website has that coil listed as a 1.5 -2 ton.
    It could be a listing error but I would still ask.
    I have a call into the installer to check on it....the listing you quoted is exactly what started me down this road when I was checking up on things. I just don't understand ,on a new install, why you wouldn't match ton ratings of the indoor coil and the compressor. I understand when you are just replacing one or the other you need to make work with what's available....But I don't get how combining the two units I have (2ton and 2.5ton) affects the SEER rating and cooling capacity. It's probably no big deal, but no one from the manufacture or the installer has been able to explain that to me.

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