One could easily determine if the round prong is setup for ground or neutral by looking at the color of the wire.
White: neutral
Green: ground
My Miele washers are wired up with two hots and a neutral. Although Miele insists that grounding is mandatory, this is the way that all of them (and I have four) have been wired to run before I got them. In each case the ground wire has been left unconnected.
I've also seen Asko washers here in the USA with the three prong plugs - but I didn't open any of them up to see if the round prong was connected to a white or a green wire.
Obviously doing both a proper neutral and a proper ground would be a good idea. But the Mieles seem to run just fine with just two hots and a neutral. The ground is there obviously for safety - just in case there's a short or some other failure in the washer that could energize the chassis/outer cabinet/door metal.
Since you have a four prong dryer outlet... it probably would be a good idea to put a four prong plug on the washer, either to plug directly into the wall outlet (big plug) or into a protected 20 amp four hole outlet on a splitter box. Again, to meet code the circuit breaker probably should be changed to 20 amps 220 volts. Your mileage may vary.
White: neutral
Green: ground
My Miele washers are wired up with two hots and a neutral. Although Miele insists that grounding is mandatory, this is the way that all of them (and I have four) have been wired to run before I got them. In each case the ground wire has been left unconnected.
I've also seen Asko washers here in the USA with the three prong plugs - but I didn't open any of them up to see if the round prong was connected to a white or a green wire.
Obviously doing both a proper neutral and a proper ground would be a good idea. But the Mieles seem to run just fine with just two hots and a neutral. The ground is there obviously for safety - just in case there's a short or some other failure in the washer that could energize the chassis/outer cabinet/door metal.
Since you have a four prong dryer outlet... it probably would be a good idea to put a four prong plug on the washer, either to plug directly into the wall outlet (big plug) or into a protected 20 amp four hole outlet on a splitter box. Again, to meet code the circuit breaker probably should be changed to 20 amps 220 volts. Your mileage may vary.