Service Manual

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4. Backup Operation
3-WAY VRF SYSTEM
Outdoor Unit Repair Procedures
• After adjusting the amount of refrigerant, turn OFF the power at the failed outdoor unit, release the
short-circuit at the vacuum application pin, and close the liquid tube valve at the failed outdoor unit.
* Refrigerant recovery is not affected by the power status of the failed outdoor unit. However, collecting
refrigerant in the failed outdoor unit is affected by whether the power at that outdoor unit can be turned
ON. If the power cannot be turned ON, use a refrigerant recovery device and recover the refrigerant into a
recovery cylinder in order to adjust the amount of refrigerant in the system.
4-2-2. Backup operation by setting the failed compressor not to operate
Backup operation settings for each compressor
INV compressor AC1 compressor Setting for backup operation
OK Failed DIP switch S010:
Turn BACK UP and AC1 ON.
Failed OK DIP switch S010:
Turn BACK UP and INV ON.
SM830201-00_3WAY VRF.indb 8SM830201-00_3WAY VRF.indb 8 2012/01/30 14:58:512012/01/30 14:58:51