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Without the Model Number, it's hard to know what knob fits your model. However, the link below, may provide some help. But, having the Model Number would be a bulls eye. Remove the front of the AC unit. There may be a manufacturer's data plate inside, which would provide the model number.
Jules, without a correct Model Number (not Vision Aire, that's just a glitzey name), it's hard to steer you in the right direction on where to find the knob. If however, you can come up with a correct model number, you can go to the link below and search for it by your Model Number.
If this is a wall or window unit, the plastic vanes on the front direct the air flow. If there is a knob to change the AIRFLOW (not the temperature) direction from "down" to "front" or some such, try removing the front panel and see if the control knob has come loose, or see if there is some kind of linkage that has come loose or is broken. Replace broken parts as needed, or fix them if you are able. If this has helped, please rate it accordingly. Good luck.
Since you have a knob, I am assuming that this unit has manual controls that are mounted directly below the air conditioner on a ceiling pack. If you smell burned wiring, remove the inside shroud to access the 120VAC connections in the unit. Check these connections for OK, if they look burnt, cut them back and reattach them (be sure to turn the breaker off first). Try the AC again.
If those connections look fine, then remove the upper cover from the unit. Access the capacitors on the side of the unit and check them for ok. If any one of them looks burnt, replace it. These two places are usually the only place that you will get a burned plastic smell.
One of the knobs controls fan speeds, cooling speeds and an off position. Center knob controls temperature and bottom knob more than likely controls air exchange. As for the front cover it would depend on the units age as to if it would be available.