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  1. #1
    Join Date
    Mar 2013
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    LRA on Carrier 5-ton Infinity / Performance

    I am trying to install a 20 kW Generac Guardian natural gas generator. I believe this generator is rated for 145 LRA, but my current AC unit is 10+ years old, and pulls 165 LRA.

    So, I'm looking to upgrade my 5-ton AC unit, likely to a Carrier model. It appears that the Performance Series 5-ton (24ACC6) has an LRA of 135 amps. Good, but it'd be better if there were some more wiggle room. See top of page 8 below:

    http://www.docs.hvacpartners.com/idc...24acc6-2pd.pdf

    On the other hand, according to the specs that I'm able to find online, the Carrier Infinity 5-ton (24ANB7) has an LRA of 118 -- great! See top of page 5:

    http://www.docs.hvacpartners.com/idc...24anb7-1pd.pdf

    However, my HVAC contractor informs me that the latest info available on the Infinity 5-ton lists an LRA of 159.6. That's not great.

    Can anyone here help out? Which is correct? Thanks very much!

  2. #2
    Join Date
    Jul 2007
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    Virginia
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    Quote Originally Posted by jjfr View Post
    However, my HVAC contractor informs me that the latest info available on the Infinity 5-ton lists an LRA of 159.6. That's not great.

    Can anyone here help out? Which is correct? Thanks very much!
    He is correct.

    In early 2013 Carrier change a few things to the 24ANB7 units, and one was the compressor. When the compressor changed, so did the electrical specs for the unit.

    Both the MCA and MOCP increased, as did the compressor LRA, which is now 152.9.
    Instead of learning the tricks of the trade, learn the trade.

  3. #3
    Join Date
    Jan 2009
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    Keokuk, IA
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    Add some insulation, get a load calc done, maybe you only need 4 tons.

    look at a greenspeed. I susect lra would be a little lower.



    Sent from my SGPT12 using Tapatalk 2

  4. #4
    Join Date
    Mar 2013
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    9
    Quote Originally Posted by motoguy128 View Post
    Add some insulation, get a load calc done, maybe you only need 4 tons.

    look at a greenspeed. I susect lra would be a little lower.

    Wow, at least according to this, LRA is 42 !!

    http://www.docs.hvacpartners.com/idc...25vna-01pd.pdf

    Will look into this, thanks much for the recommendation.

  5. #5
    Join Date
    Mar 2013
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    9
    rundawg: Do you happen to know if the LRA on the Performance is current as well (135), or did they make changes to that compressor as well?

  6. #6
    Join Date
    Jan 2009
    Location
    Keokuk, IA
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    It has a digital scroll... so theres a drive and its a permenant magnet motor, so it makes good low end torque andc doesnt need a huge electrically generated field to start spinning. Plus the drive has large capacitors as well. The greenspeed also produces more heat without strips at beliw about 40f, temps and if sized right will run almost continous. Factor in its cost over a larger generator.



    Sent from my SGPT12 using Tapatalk 2

  7. #7
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    Jul 2007
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    Virginia
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    Quote Originally Posted by jjfr View Post
    rundawg: Do you happen to know if the LRA on the Performance is current as well (135), or did they make changes to that compressor as well?
    The 25HCB6 (16 SEER) also had the compressor change in July 2012, so it's LRA is 152.9.

    The 25HCB3 (13 SEER), and 25HCC5 (15 SEER), both have a LRA of 134.0
    Instead of learning the tricks of the trade, learn the trade.

  8. #8
    Join Date
    Mar 2013
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    9
    Quote Originally Posted by rundawg View Post
    The 25HCB6 (16 SEER) also had the compressor change in July 2012, so it's LRA is 152.9.

    The 25HCB3 (13 SEER), and 25HCC5 (15 SEER), both have a LRA of 134.0
    Thanks -- the unit I was considering was the 24ACC6. Still 134?

  9. #9
    Join Date
    Jul 2007
    Location
    Virginia
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    Sorry about that, I was thinking heat pumps.

    In the latest 24ACC6 manual, the LRA is 135.

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