Currently the output color space can be set only in the IPR, because Cinema 4D does not support custom OCIO color spaces, so it conflicts with the default sRGB transform in the Picture Viewer. The recommended workflow is to render to linear (e.g. EXR or 32-bit tiff) and do the output color space transform in compositing (e.g. After Effects). Or you can use an Arnold Driver where you can set the output color space to ACES.
I'm currently working on making it available in the Picture Viewer too, so hopefully this limitation will be raised in a next release soon.