Oil Return Operation - Samsung AM080FXWANR Service Manual

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-4 Special operation modes (cont.)

Oil return operation

Purpose
Perform oil return after a specified amount of time has elapsed in order to prevent an insufficient amount of oil in compressors.
Concept
The compressor capacity is raised to increase the amount of refrigerant circulation. This will return oil remaining in indoor units
and piping.
Control specifications in detail
- Oil recovery operation shall be performed to prevent a compressor from being short of oil. Oil in pipes or indoor unit will be col-
lected to outdoor unit by starting oil collecting operation.
- Oil collecting operation will begin 7 hours after outdoor unit starts to operate but time might be reduced depending on the
operating condition (# of compressor in operation and operating frequency).
- Master outdoor unit will be changed after oil collecting operation.
Capacity of compressor
Indoor EEV
*Additional capacity = Compensation capacity of stop units
* EEV step can be varied by cycle condition.
Samsung Electronics
Actuator
Outdoor EEV
Operating indoor units
Stopped indoor units
Indoor Fan
Time
Oil return Operation
Current capacity + additional capacity
Normal control
Higher step of [400(C)/300(H) or Current step]
400(C)/300(H)
Normal control
3min(C) / 6min(H)
223