Looking at the Trane high end units Trane XL16i Model 4TWX6024B and Trane XL20i Model 4TWZ0024A.
Are the first stages of compressor operation the same BTUs but different energy consumptions. I have read that the two speed compressors operate at about 70% in first stage, while the dual compressor models operate at about 50% in first stage. Is this an energy usage statement or a BTU output statement? Is the BTU output close and the difference is an efficiency issue with varying the output of a single compressor?
Asked another way: Is a dual compressor model more efficient in its first stage compared to a 2 stage single compressor due to the motor being more efficiently matched to its load?
Does anybody have data on the BTU/Kw per stage for these units available?
And finially, I have only been able to find dual compressor models available from American Air/Trane. Is there another manufacturer with dual compressor models?