Auto Line Correcting - Mitsubishi Electric MXZ-2C20NA2-U1 Service Manual

10-2. AUTO LINE CORRECTING

Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping.
Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871).
When improper wiring or piping is detected, wiring lines are corrected.
This will be completed in about 10 to 20 minutes.
[How to activate this unction]
2. Check that the stop valves of the liquid pipe and gas pipe are open.
3. Check that the wiring between indoor and outdoor unit is correct.
(If the wiring is not correct, this function does not work.)
4. Turn ON the power supply and wait at least 1 minute.
5. Press the piping/wiring correction switch (SW871) on the outdoor control P.C. board.
Do not touch energized parts.
LED indication during detection:
LED1 (Red) LED2 (Yellow)
Lit
LED indication after detection:
LED1 (Red) LED2 (Yellow)
Lit
Once
Other indications
Make sure that the valves are open and the pipes are not collapsed or clogged.
6. Press the switch to cancel.
LED indication after cancel :
LED1 (Red) LED2 (Yellow)
Lit
NOTE : Indoor unit cannot be operated while this function is activated.
When this function is activated while indoor unit is operating, the operation will be stopped.
Operate indoor unit after the auto line correcting is finished.
Pressing the switch during detection cancels this function.
Press the switch for more than 5 seconds.
LED will show the record of auto correcting for about 30 seconds as shown in the table below:
Number of blinks
LED1 (Red) LED2 (Yellow)
Once
3 times
NOTE: Activate this function to confirm the correct wiring after replacing the outdoor control P.C. board.
(Previous records are deleted when the outdoor control P.C. board is replaced.)
The record cannot be shown if auto line correcting is not canceled (Refer to "How to activate this function").
OBH702G
LED3 (Green)
Lit Once
LED3 (Green)
Not lit Lit Completed (Problem corrected/ nomal)
Once Once Not completed (Detection failed)
Refer to "SAFETY PRECAUTIONS WHEN LED BLINKS"
located behind the service panel.
LED3 (Green)
Lit Not lit
LED3 (Green)
Once Lit
3 times Lit
Indication
Wiring line
Not corrected
Corrected
78