Haier N Series Service Manual page 45

Each indoor unit musts to be vacuumed , according to the above steps.
If the refrigerant of the air conditioner leaks, it is necessary to discharge all the refrigerant. Vacuumize first, then
charge the liquid refrigerant into air conditioner according to the amount marked on the name plate.
Please do not let other cooling medium, except specified one (R410A), or air enter into the cooling circulation system.
Otherwise, there will be abnormal high pressure in the system to make it crack and lead to personal injuries.
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Installations
2-way valve
3-way valve
2-way valve
3-way valve
Domestic air conditioner
2-way valve
3-way valve
2-way valve
3-way valve