Вот, нашел на свой сплит:
*... Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa.
If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is higher than 0.1Mpa, discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa. If this is the case, it will not be necessary to apply a evacuation.
Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be discharged....*
Цифры есть, но выделенная фраза мне не совсем понятна.