Friedrich FSHSR09A1A - Safety Precautions for Installation and Relocation; Refrigerant Circuit and Unit Handling

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To ensure safety, please be mindful of the following precautions.
Warning
When installing or relocating the unit, be sure to keep the refrigerant
circuit free from air or substances other than the specified refrigerant.
Any presence of air or other foreign substance in the refrigerant circuit will cause
system pressure rise or compressor rupture, resulting in injury.
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Safety precautions for installing and relocating the unit