Piping Diagram
Samsung Electronics 223
Oil return operation
ƒ Purpose
Perform oil return after a specified amount of time has elapsed in order to prevent an insufficient amount of oil in compressors.
ƒ Concept
The compressor capacity is raised to increase the amount of refrigerant circulation. This will return oil remaining in indoor units
and piping.
ƒ 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
.
Actuator Oil return Operation
Capacity of compressor Current capacity + additional capacity
Outdoor EEVNormal 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
Time3min(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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