Mitsubishi Electric Mr.Slim PUZ-HA42NKA Service Manual page 4

[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
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OCH567
Gravimeter
Unit