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Sizing an EnergyPlus plant loop with both heating and cooling coils

I'm developing a model of a runaround loop heat recovery system in EnergyPlus. I have a plant loop that has both a cooling coil (cooling the outdoor air stream) and heating coil(dumping heat to exhaust air stream). I'm running into an interesting situation where I want to size the cooling coil with one Sizing:Plant object and the heating coil with another. I can get the coils to autosize using conditions in the middle of each coil (Design Loop Exit Temperature of ~60F), but this tends to undersize each coil. Has anyone successfully autosized both heating objects and cooling objects on a single plant loop?