Midea R410A Full DC Inverter Split Type Series Technical Manual MCAC-UTSM-201406
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or the right front board.
Schematic diagram of connection between indoor unit and outdoor unit:
When welding the refrigerant pipe, in order to prevent internal oxidation of the pipe, nitrogen
must be filled in. Otherwise, the oxidized chips may block refrigerating circulatory system.
As following picture, when brazing the indoor and outdoor connective pipes, pad a sheet metal
under the valve avoids the flame burning the chassis.
Trash and foreign matters may come into the pipe in the process of installing the refrigerant pipe.
Be sure to blow them off with nitrogen before connecting the pipe to the outdoor units.
Use high-pressure nitrogen to clean the pipelines. Do not use the refrigerant of the outdoor unit
