Mitsubishi Electric CMB-WM108V-AA 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).
To evacuate air from the HBC and extension pipes
Apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1
and 2).
When performing the maintenance work, such as vacuum drying, pumping down, or refrigerant recovery, on the out-
door unit or the heat-source unit, set SW5-1 first and then SW4-5 on the HBC controller board to ON to operate the
water circuit pump and circulate the water to prevent the water side of the heat exchanger within the HBC from freez-
ing.
* When vacuum drying, pumping down or refrigerant recovery has been completed, set SW4-5 first and then SW5-1
to OFF.
HWE1708A
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GB