求翻译：Please note that this equipment comes pre-charged with liquid refrigerant, and that by federal law cannot be released to the atmosphere. Yes you can purchase this equipment without being certified, and if you are mechanically inclined you can perform about 90% of the equipment installation yourself. However, you must have a professional heating / cooling contractor do the final part of the installation which requires managing the refrigerant. Also, having a contractor perform the final startup and inspection of this central air conditioner validates your warranty with Alpine.是什么意思？

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