Drying Picked Beans (Scarlet Runners)
Some of the situation depends on how dry the climate you live in is (and how dry your house is). The temps suggested sound OK, if you are in a hurry.  If you don't live in a really humid climate, you could probably just shell the beans, and then dry them in a single layer on a sheet pan over a few days, giving them a stir, to flip the beans over, and redistribute the moist sides vs. drier sides.  How long it would take depends a lot on how warm and how humid your air is.  You could also try using a dehydrator, which uses a fan to speed the process up.