Fujitsu Airstage J-II, Service Manual

Page: 37 / 209

2-5 SPECIAL OPERATION
2-5-1 Oil Recovery Operation
Purpose of the operation
The amount of refrigerant lubricant 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 increases.
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.
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.
Others
02-09
<
Start condition >
Compressor accumulated operation time since last cooling oil recovery operation exceeds 3 hours (first time : 1hour)
< End condition >
30 seconds have elapsed since the start and "suction temperature - low pressure saturation temperature 5deg" or 6 minutes
have elapsed since the start.
< Operation >
COMPRESSOR: The rotation speed varies depending on the operation state.
EEV Opening (Indoor/Outdoor unit): Controlled pulse (as normal operation mode).
FAN speed (Indoor/Outdoor unit) : Controlled fan speed (as normal operation mode).
2. Oil Recovery in Heating operation
1. Oil Recovery in Cooling operation
< Start condition >
Compressor accumulated operation time since the last heating oil recovery exceeds 8 hours (first time : 1hour)
< End condition >
After 4 minutes have elapsed
< Operation >
COMPRESSOR: The rotation speed varies depending on the operation state.
EEV Opening (Indoor/Outdoor unit) : Controlled pulse (as normal operation mode)
FAN speed (Indoor/Outdoor unit) : Controlled fan speed (as normal operation mode)