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A comment on Heat pumps of the 1800s are becoming the technology of the future. Parent comment

Re:Heat pumps of the 1800s are becoming the technology of th... by culopatin on Wednesday January 18, 2023 @11:16AM (#34428621)
How do you get the pipes through the wall in a pre charged unit? Do they have two pieces connected by a special valve? I’m curious about how they keep the air out of the lines.
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Re:Heat pumps of the 1800s are becoming the technology of th... by thedougd on Thursday January 19, 2023 @10:32AM (#34441366)
Pre-charge has one of two meanings here. Most mini-split units have the refrigerant in the compressor unit. After a complete installation, evacuation, etc, you open a valve to release the refrigerant into the lines.

There are also DIY variants where a fixed line length comes from the factory with either a vacuum or a refrigerant in the line. The lines have metal seals on the fittings that are ruptured when torqued down on the equipment.

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