It really doesn't matter as long as you connect 110V across the L & N connections
really really bad advice
It really does matter how you connect 110V across the L & N connections if you live in a country that has a grounded neutral. while your device may function either way, there is no guarantee any of the safety devices employed in it still will and any poor sucker who comes along later to service the unit might get a rather nasty or fatal surprise due to an active neutral swap.
if you don't know don't mess with it .