Haier 5U90S2SS2FA Installation Manual page 15

Refrigerant Charging Procedures
The following requirements are added as the supplementation of conventional procedures:
Requirements on storage site of refrigerant
Scrapping and Recovery
Scrapping
Note:
The air conditioner shall be marked (with dates and signature) after being scrapped and the refrigerant is discharged.
It shall be guaranteed that the sign on the air conditioner can reflect the flammable refrigerant charged inside.
Recovery