Daikin FXYBP20K7V1, Service Manual

Page: 66 / 193

SiE 00-07 Outline of Control (Outdoor Unit)
Function R-407C PLUS Series 55
3.10 Oil Return Operation
Activates the oil return operation to collect refrigerant oil from the field pipes when the following conditions
are met.
[Start conditions]
1. When cumulative compressor operating time from power ON exceeds 2 hours
2. When cumulative compressor operating time from completion of previous return operation exceeds 8
hours.
However, when the upper-limit frequency is limited to less than “A” Hz during the previous oil return
operation, the above time period of 8 hours is changed to 4 hours.
∗
1) When defrost control operation for more than 4 minutes with inverter compressor frequency of “A”Hz or
higher, oil return time reset to 8 hours.
2) When condition 1. or 2. is satisfied during heating operation, the electric heaters of indoor units are
turned off 2 minutes prior in order to prepare for the oil return operation.
3) The oil return operation is not activated for 28 minutes after the completion of the previous defrosting
operation.
[Oil return operation]
The compressor operating frequency is set to “B” Hz shown in the following table.
[Ending conditions]
The oil return operation ends after 1~8 minutes of operation. However, when the compressor stop
conditions are met during an oil return operation, the compressor stops after the completion of the oil
return operation.
When the compressor stops during an oil return preparation operation, the oil return operation is
activated at the next startup.
When the defrost control needs more than 4 minutes above “A” condition, the timer of oil return is reset
to 8 hours
A B
INV STD1 STD2 INV STD1 STD2
RSXYP16KJ 33Hz ON — 52Hz ON —
RSXYP18KJ 41Hz ON — 71Hz ON —
RSXYP20KJ 41Hz ON — 71Hz ON —
RSXYP24KJ 75Hz ON OFF 52Hz ON ON
RSXYP26·28·30KJ 75Hz ON OFF 52Hz ON ON