When using the H2D, even if you use two colors on different nozzles, you must force the partial purge setting to 0 for the colors to avoid any purging during a filament change; however, with the H2C, as long as you aren’t using two colors on the same nozzle, no partial purge is performed—even when switching extruders.
Are you sure? I’ve never observed a purge occurring after the first change when using two materials on my H2D.
I’ll double-check, but here’s what seems to happen:
It cools down to 25°C, then when it starts up again, it purges—I think—and primes itself, wipes the nozzle on the tower, and heads off to print! But maybe I misread it.