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I believe the split is to accommodate energy savings during night time hours.
While the bedrooms are unoccupied, they can be left with a higher setback temperature to save energy during the day. Downstairs comfort cooling is being maintained (while occupied).
At night the unoccupied 1st floor setpoint is set back to save energy. The smaller 2nd floor unit takes over. No solar load at night so it should be able to keep up.
The thing about setting temperatures back to save energy is that if the structure (mass) of the building heats up too much, it may be a long run time before it becomes comfortable.
With the roof top a/c problem, you might need to see if there are any balancing dampers to get the distribution right. You may need to speed up the supply air fan to provide more static pressure to the system to get air out to the furthest zone. You may be able to get a transfer fan installed to pull the warm air down to the lower floors in the winter.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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