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Yes, you will damage your system if not refilled properly.

You have to vacuum out the system to ensure you the have correct amount of refrigerant in the system when you refill. Too much or too little will damage the system.

Also, if you left the system open to atmosphere, you will need to replace the drier that removes all the moisture that the vacuuming could not. Water doesn't compress, so having moisture in the system will damage your compressor.
 
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