Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 19

[ I Read Before Servicing ]
7. Notes
To evacuate air from the entire system
Applying a vacuum through the check joints at the refrigerant service valve (BV1 and 2) is not enough to attain the
desired vacuum pressure.
Be sure to apply a vacuum through the check joints at the refrigerant service valve (BV1 and 2) and also through the
check joints on the high and low pressure sides (CJ1 and 2).
To evacuate air only from the heat source units
Apply a vacuum through the check joints on the high and low pressure sides (CJ1, and 2).
To evacuate air from the indoor units and extension pipes
Apply a vacuum through the check joints at the refrigerant service valve (BV1 and 2).
HWE15150
- 10 -
GB