Samsung AM072BXV Series, Руководство по обслуживанию

Страница: 253 / 326

Piping Diagram
Samsung Electronics 247
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 operat -
ing 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 ca 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.)