Definitely NOT made for use in North America, and not UL or CSA listed. GoldDigger is right, that warning should be a red flag that the unit is somehow internally bonded or grounded on what THEY would consider the neutral, which would mean you cannot hook it up here in North America unless you go buy a special transformer to create that type of separate system just for it. Their power system is 400Y230V 3 phase 4 wire pretty much everywhere, even in residential services. So for single phase equipment, they use one phase and neutral, which gives them 230V. That might be OK for using here, UNLESS they bond the neutral inside of the equipment itself, which they sometimes do for special circumstances. When they do, they include some sort of warning, just like what you read. In addition, that has a blower, which, if running at 60Hz instead of 50Hz, will likely increase the load on the motor to 172% of normal and trip it out on OL, or burn it up. People think they are being smart by buying crap from overseas over the internet without checking to see if it will work here. Happens a lot more often now.
Before hooking that up, I would get something in writing from your customer saying they acknowledge that you are not going to accept any responsibility for damage to the equipment or any liability for anything arising from you installing unlisted equipment.