Fujitsu AUXB12GA* H - 2-6 SPECIAL OPERATION

2-6 SPECIAL OPERATION
2-6-1 Oil Recovery Operation
02-11
2-6-2 Pre-heat Operation
This pre-heat operation protects the start up failure by preventing the refrigerant from soaking into the oil in compressor.
Crankcase heater ON: 30 minutes elapsed since installed compressors stopped
(However, ON when power turned on)
OFF: Installed compressors operation
35W (1 pcs)
70W (2 pcs)
5
3
2 pcs of belt heater installed on the compressor
The crankcase heaters are controlled by the outdoor temperature
< Control condition >
(1) 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
< Start condition >
< End condition >
30 seconds have elapsed since the start and "suction temperature - low pressure saturation temperature 5deg"
at all outdoor units or 6 minutes have elapsed since the start.
< Operation >
COMPRESSOR: Performed by all INV compressors operating up until now
INV 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).
< Start condition >
< End condition >
After 4 minutes have elapsed
< Operation >
COMPRESSOR: Performed by all INV compressors operating up until now
INV 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)
Cooling oil recovery operation
Compressor accumulated operation time since last cooling oil recovery operation exceeds 3 hours
(first time : 1hour)
Heating oil recovery operation
Compressor accumulated operation time since the last heating oil recovery exceeds 8 hours
(first time : 1hour)