Panasonic U-72MF1U9 Technical Data Manual page 36

2. System Design
WARNING
Checking of limit density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
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Always check the gas
density limit for the room in
which the unit is installed.
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Design of 3WAY VRF SYSTEM