Mitsubishi Electric MXZ-2HA40VF-E1 Service Manual page 39

11-4. AUTOMATIC LINE CORRECTING
<MXZ-2HA40VF/2HA50VF>
This outdoor unit has an automatic line correcting function which automatically detects and corrects improper wiring or piping.
<MXZ-2HA40VF/2HA50VF>
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
NOTE: This function does not work when "2" on SW2 on the outdoor display P.C. board is turned OFF.
<Correct>
Terminal
block
Liquid/
Gas pipe
Outdoor unit
<Incorrect wiring>
Terminal
block
Liquid/
Gas pipe
Outdoor unit
<Incorrect piping>
Terminal
block
Liquid/
Gas pipe
Outdoor unit
The record of automatic line correcting can be checked in the following way:
(1) Turn OFF the power supply and make sure that the LED goes off.
(2) Turn ON "3" on SW2 on the outdoor display P.C. board.
(3) Turn ON the power supply.
(4) Check the correction state with the LED lamps on the outdoor display P.C. board.
(5) Turn OFF the power supply and make sure that the LED goes off.
(6) Turn OFF "3" on SW2 on the outdoor display P.C. board.
(7) Turn ON the power supply.
Number of blinks
LED1 (Red) LED2 (Yellow)
Once
3 times
OBH828B
B
A
Indoor unit B
B
A
Indoor unit A
B
A
Indoor unit B
B
A
Indoor unit A
B
A
Indoor unit B
B
A
Indoor unit A
Wiring line
Once Not corrected
3 times Corrected
MXZ-2HA40VF/2HA50VF
SW2 on the outdoor display P.C. board
SW2
Indoor/outdoor
connecting wire
Refrigerant pipe
MXZ-2HA40VF/2HA50VF
SW2 on the outdoor display P.C. board
SW2
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