How does the liquid line filter replacement procedure take place?

Change liquid filter dryer:

1. Ensure valve 90I is open before carrying out any works.
2. Attach a suitably rated gauge manifold to ¼” connection 107F.
3. Close drier entry valve 90c and allow the pack to pump down for 10 minutes.
4. Again ensure valve 90I is open and then shut dryer outlet valve 90B and open dryer bypass valve 90A slowly.
5. Close valve 90I and immediately vent the remaining refrigerant through gauge manifold to a well ventilated area.
6. Once pressure has equalised and any frost line on the dryer end plate has melted remove drier housing end plate and replace gasket.
7. Install new filter drier core and replace housing end plate immediately. Evacuate drier housing to 0.5 mbar.
8. Break vacuum with CO2 vapour to >6 bar.
9. Close valve 107F and remove gauge manifold.
10. Open shut off valves 90I, 90C & 90B.
11. Close valves 90A