Mitsubishi Electric MXZ-2HA40VF2-E1 Service Manual page 47

<MXZ-3HA50VF> <MXZ-3HA50VF2>
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 15 minutes.
[How to activate this function]
1. Check that outside temperature is above 0˚C.
(This function does not work when the outside temperature is 0˚C or below.)
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.
The record of auto line correcting can be confirmed in the following way:
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").
11-5. SETTING WHEN THE PIPING LENGTH IS LONG <MXZ-3HA50VF2>
For a system that connects all rooms and has a total piping length of 40 m or more, change the setting to improve the circu-
lation of the refrigerant.
[How to perform the setting]
(1) Be sure to turn off the main power of the air conditioner before performing the setting.
(2) To enable this function, set SW1 "6" on the outdoor controller board to ON.
(3) Turn on the main power of the air conditioner.
OBH828D
LED3 (Green)
Lit Once
LED3 (Green)
Not lit Lit Completed (Problem corrected/ normal)
Once Once Not completed (Detection failed)
Refer to "SAFETY PRECAUTIONS WHEN LED BLINKS"
located behind the top panel.
LED3 (Green)
Lit Not lit
LED3 (Green)
Once Lit
3 times Lit
Result
Wiring line
Not corrected
Corrected
47
When the piping length is long