The nameplate will provide a large amount of information, including the the manufacturer's name, model, serial, electrical requirements and the BTU rating or capacity that I believe you are looking for. Like the 120 volt sisters, the 240 volt unit should also have a nameplate. If unable to locate it on the chassis or frame of the unit in a similar location as the 120 volt, you'll have to look elsewhere. A www.google.com search on model number you provided (
XHD183D) for this question indicates that it is a 17,900 BTU unit. If this is the correct model, case closed. If not, continue reading.
A good place to locate a nameplate if not plainly visible on the unit as it sits in the window would be on the chassis or frame behind the decorative grille. The grille is likely held in place by several clips and a screw or two. Shut off the AC and unplug it from the power source. Remove the filter as if to clean and carefully check for and remove screws and remove the grille.
I hope this helps!
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