Piping Diagram
Samsung Electronics 344
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). Once defrosting operation operate for more than
3 minutes during heating operation, it will be considered to have done oil collecting operation.
- Master outdoor unit will be changed after oil collecting operation.
Actuator Oil return Operation
Capacity of compressor Current capacity + additional capacity
Outdoor EEV Normal control
Outdoor Fan Normal control
Indoor EEV
Operating indoor units Higher step of [400(C)/300(H) or Current step]
Stopped indoor units 400(C)/300(H)
Indoor Fan Normal control
Time 3min(C) / 6min(H)
*Additional capacity = Compensation capacity of stop units
* EEV step can be varied by cycle condition.
7-3 Functions (cont.)
7-3-2-4 Special operation modes (cont.)
7-3-2 Control (cont.)
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