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  1. #1
    Join Date
    Sep 2012
    Posts
    37

    2-Stage Condensing Unit Questions

    A couple of quick questions on 2-stage AC systems...

    1) I've been looking at Trane's 2.5 ton single-stage units. Trane's two-stage units come in 2-ton and 3 ton, no 2.5 ton. In this case, should I go up or down in size?

    2) When a 2-stage system is running on 1st stage, what percentage of its full capacity is typically being used?


    Thanks!

    D.

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,617
    1. What is the heat gain for the space? Hopefully someone did one!

    2. Depends upon the match. I've seen them where low was as much as 81% of total capacity. Most with the unloading scroll are in the 75% range.

  3. #3
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,803
    A Trane 3 ton 16i in first stage is between 70 and 80% of full capacity. A Trane 3 ton 20i in first stage is roughly 50% of full capacity.
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