Mitsubishi Electric MXZ-2B30VA, Service Manual

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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 15 min.
[How to activate this function]
1. Check that outside temperature is above 0°C .
(This function does not work when outside temperature is not above 0°C.)
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 electronic control P.C. board.
Do not touch energized parts.
Make sure that the valves are open and the pipes are not collapsed or clogged.
6. Press the switch to cancel.
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.
SW871
LED1(Red)
Lighting
LED indication during detection:
LED indication after detection:
LED2(Yellow)
Lighting
LED3(Green)
Blinking
LED1(Red)
Lighting
LED indication after cancel:
LED2(Yellow)
Lighting
LED3(Green)
Goes Out
LED1(Red)
Lighting
Blinking
LED2(Yellow)
Goes out
Blinking
Other indications
LED3(Green)
Lighting
Blinking Completed (Detected successfully)
Cannot be corrected
Refer to"SAFETY PRECAUTIONS WHEN LED FLASHES" located behind the service panel.
Indication
SW871
<MXZ-4B80VA, MXZ-5B100VA>
The record of auto line correcting can be confirmed in the following way:
Press the switch for more than 5 sec.
LED will show the record of auto correcting for about 30 sec. as shown in the table below:
NOTE:
Activate this function to confirm the correct wiring after replacing the electronic control P.C. board.
(Previous records are deleted when the electronic 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").
LED1(Red)
Once
3 times
LED2(Yellow)
Once
3 times
LED3(Green)
Lighting
Lighting Not corrected
Corrected
Number of blinks
Wiring line
The record of auto line correcting can be confirmed in the following way:
Turn OFF the power supply.
Turn ON the "4" of SW1 on the display P.C. board.
Turn ON the power supply.
Confirm the correction by the blinking of LED.
Turn OFF the power supply after the confirmation, and turn OFF the 4th Dip Switch of SW1 on the display P.C. board.
Turn ON the power supply.
NOTE: This function does not work when the jumper wire JGO on the inverter P.C. board is cut.
ON
MXZ-2B
SW1
LED1 (Red)
Once
3 times
LED2 (Yellow)
Once
3 times
Number of blinks
Wiring line
Not corrected
Corrected
OBH554D