Mitsubishi Electric CMB-WP1016V-GA1 Service Handbook page 20

[ 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 on the high and low pressure sides (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 on the high and low pressure
sides (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 outdoor units
Apply a vacuum through the check joints on the high and low pressure sides (CJ1, and 2).
Open the valves in the HBC controller, and switch on the power to the outdoor units, HBC controllers, and indoor
units before performing evacuation so that all refrigerant circuits will be open. (By switching on the power to the in-
door units, normal M-NET communication will be maintained.)
HWE1410A
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GB