Auto Line Correcting Function; Correct Line; Incorrect Wiring - Mitsubishi Electric MXZ-2A40VA Service Manual

12-3. AUTO LINE CORRECTING function (MXZ-2A)
This outdoor model has an auto line correcting function which automatically detects incorrect wiring or piping as shown
in the following pictures, and interchanges the wiring lines (A to B/B to A) with the software.
Only one indoor unit has to be performed cooling operation for 30 minutes to complete the detection.
However, this function be may not work due to the condition of the unit, or the environment.
For example,
- gas leak, closed stop valve
- unit failure such as defective LEV
- indoor/outdoor temperature
<Correct line>
OUTDOOR UNIT
<Incorrect wiring>
OUTDOOR UNIT
A
B
A
B
A
B
A
B
INDOOR UNIT A
INDOOR UNIT B
INDOOR UNIT A
INDOOR UNIT B
51
Refrigerant piping
Indoor/outdoor
connecting wire