The operating range is not the startup voltage. Look at the linked pdf of specifications. I would guess it is that amount to get going but once up it can work with voltage down to 80v.I was going to suggest that start up was to low but a quick search showed it shouldn't be the issue.... Rtfm to me
Yes I read the specifications. If it says startup voltage is 120v, and it does, than anything less is likely not going to work.
So don't get all nasty with RTFM when in fact I did.