Daikin RXF50D5V1B Installer's Reference Manual page 44

7 | Piping installation
Installer reference guide
44
NOTICE
Make sure to open the stop valves after installing the refrigerant piping and
performing vacuum drying. Running the system with the stop valves closed may
break the compressor.
INFORMATION
After opening the stop valve, it is possible that the pressure in the refrigerant piping
does NOT increase. This might be caused by e.g. the closed state of the expansion
valve in the outdoor unit circuit, but does NOT present any problem for correct
operation of the unit.
RXF50~71D5V1B
R32 split series
4P519439-15Q – 2021.10