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I've been thinking on it and well..if the other place had a 4 prong and it was in the same country..you should have no problem finding a 4 prong receptacle. BUT..you may have to rewire the whole circuit. 3-wire with ground is used on the 4 prong and 2-wire with ground is used on the 3-prong. So unless you take the receptacle head off and find a miracle that they used 3-wire with ground and just capped off the white wire with a wire-nut in there...you've got bigger issues. In order to utilize that 120v portion of your controller, you need to open the panel and re-wire using 3-wire with ground..all the way to a new receptacle. Panel work is pretty scary especially if you don't have a service shut off up the line away from the box where you can kill all power coming in. In the USA we switched all residential code to having to install all 3-wire with ground (4 prong) in all new work. Not sure about where you are??
It would be very simple to call an electrician and have this work done..if it is an option to have 4-prong 220v at all in your area, but I cannot recommend you do this type of work yourself..especially with limited experience. I had to be apprentice to several panel jobs before I felt confident enough to even dare working on one..it's quite a thrill let me tell you.
If you find out that you are stuck with 2 wire grounded (3 prong)...you will need to change the whip like PB says and eliminate your use of the 120v. There is no other option with limited wire...it's easy to go from 4 prong to 3 prong, but impossible to go the other way. Do not think of bonding your Neutral white with green ground wire or you compromise your ground which is very dangerous. Sorry for the bad news. First turn off the 30 amp dryer breaker, then open up the receptacle and see what you have. Then go from there.
It would be very simple to call an electrician and have this work done..if it is an option to have 4-prong 220v at all in your area, but I cannot recommend you do this type of work yourself..especially with limited experience. I had to be apprentice to several panel jobs before I felt confident enough to even dare working on one..it's quite a thrill let me tell you.
If you find out that you are stuck with 2 wire grounded (3 prong)...you will need to change the whip like PB says and eliminate your use of the 120v. There is no other option with limited wire...it's easy to go from 4 prong to 3 prong, but impossible to go the other way. Do not think of bonding your Neutral white with green ground wire or you compromise your ground which is very dangerous. Sorry for the bad news. First turn off the 30 amp dryer breaker, then open up the receptacle and see what you have. Then go from there.