Mitsubishi Electric MXZ-2B30VA Service Manual page 61

10-4. AUTO LINE CORRECTING
Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping.
<MXZ-2B30VA, MXZ-2B40VA, MXZ-2B52VA>
Improper wiring or piping can be automatically detected when one indoor unit is operated in COOL mode for 30 minutes.
When improper wiring or piping is detected, wiring lines are corrected (A to B/ B to A) with the software.
NOTE:
This function may not work due to the condition or environment of the unit, such as the following:
- gas leak, closed stop valve
- unit failure such as defective LEV
- indoor/outdoor temperature
<Correct line>
OUTDOOR UNIT
<Incorrect wiring>
OUTDOOR UNIT
<Incorrect piping>
OUTDOOR UNIT
OBH554D
A
B
A
B
A
B
A
B
A
B
A
B
INDOOR UNIT A
INDOOR UNIT B
INDOOR UNIT A
INDOOR UNIT B
INDOOR UNIT A
INDOOR UNIT B
61
Refrigerant piping
Indoor/outdoor
connecting wire