Is this possible to convert this unit in the field to 480V-3PH
Possible, Yes. Reasonable, No
You would have to replace all 4 heating elements, and change the jumpers on the control transformer. The elements are about $1200 each. Being it is a kit it may be all four, but you would have to call on that.
Alternately one could install a transformer to supply it. Probably for less money. The 208 version is only 12 kw. The 240V and 480V are 16 kw. So it would heat faster.
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