Can I capture audio at 24 bit using MOTU HDX-SDI?

I am trying to capture 8 bit uncompressed AVI files with 24 bit audio using Adobe Premiere CS6 and a MOTU HDX-SDI. I have set the MOTU audio settings to 24 bit via Premiere before the capture.
The resulting capture file using Adobe Premiere contains 32 bit audio not 24. The 16 bit setting captures correctly to 16 bit. Can the audio be captured at 24 bit using this interface with Adobe Premiere?
I have contacted MOTU and they claim that the audio is captured at 24 bit regardless.  Is Premiere upconverting the bit depth?
I am using ffprobe, mediainfo, AVI-Metaedit, and Premiere to examine the metadata in the captured file.
I'm using Adobe Premiere CS6 6.0.5
Windows 7 64-bit.
Thanks

Premiere is not upconverting the bit depth on those files upon import.
It doesn't change the original file, it creates new files, called Conformed Audio and using the .cfa extension, at 32 bit floating-point bit depth.  PP uses those CFA files for the actual audio work inside the program and when exporting.  The only thing it really does with the original audio files is read them for the conforming process.

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