Compressor 1
ON
OFF
Indoor Fan
3-9 OIL RECOVERY CONTROL
OFF
OFF
OFF
ON
ON
ON
Compressor 2
Compressor 3
4 9mins
1 min
Oil recovery start
Oil recovery end
03-10
Outdoor Fan
OFF
ON
1) Purpose of the operation
The amount of refrigerant machinery oil which has been transported to the indoor units and the connection pipe with the
refrigerant will become large as the operation time of compressor increase. It is necessary to recover the oil back into
the outdoor unit for a certain time interval in order to prevent compressors from damaging due to lack of lubrication oil.
2) About the oil recovery operation
When "oil recovery integrated time", which is the integrated operating time of any compressor in operation,
reaches to the certain time, the oil recovery operation starts.
The "oil recovery integrated time" to start the oil recovery is as follows.
- The first time of oil recovery after the power is turned on : 1 hour
- The second time and afterwards : At intervals of 4 6 hours
Please note that "oil recovery integrated time" is reset to zero at the end of defrosting operation.
The oil recovery operation can be performed by setting the forced oil recovery DIP SW2-4 from OFF to ON and keeping
it at ON position for more than 10 seconds.
3) The operation of compressors and fans
The following time chart shows the behavior of compressors, outdoor fan and indoor fan during oil recovery operation.
DEFROST
4) Others
During the oil recovery operation, appears on the display of wired and central remote controller,
and appears on the simple remote controller.
The operation indicators (LED) of the indoor units flash slowly.
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