Midea V4 Plus S Series Service Manual page 6

R410A All DC Inverter V4+S Series 60Hz
1.3 High reliability
1.3.1 Cycle duty operation
The cyclical start-up sequence of outdoor units and DC inverter compressors equalized compressor duty and
extends operating life
1.3.2 Back-up function
In a multiple system, if one module is failed, other modules can be backup instead of the failed one for
continuing operation.
1.3.3 Precise oil control technology
5 stages oil control technology ensures all outdoor unit and compressor oil is always kept at a safe level,
completely solving any compressor oil shortage problems.

1st stage: Compressor internal oil separation.

2nd stage: High efficiency centrifugal oil separator (separation efficiency up to 99%) ensures oil
separated from the discharge gas is returned to the compressors.

3rd stage: Oil balance pipes between compressors ensure even oil distribution to keep compressors
running normally.

4th stage: Oil balance pipes among modules ensure even oil distribution among modules.

5th stage: Auto oil return program by monitoring the running time and system status ensures reliable oil
return.
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MCAC-VTSM-2015-09
General Information