I have a rather expensive digital timer rated at 120AC, 15A and a Leybold vacuum pump, 220 VAC, 2.0A. Can I wire just one leg of the 220 to the switch and control the pump that way? I realize that leaves one one leg of the pump circuitry energized when the switch shuts off, but it does stop the pump as I once wired a small fan this way without a problem.

Does this idea present any serious problems/dangers? I resort to this because I can't find a 220 digital timer similar to what I already have.