Other Control Si39-30288 Function5. Other Control5.1 Outdoor Unit RotationIn the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent thecompressor from burning out due to unbalanced oil level between outdoor units.[Details of outdoor unit rotation]In the case of multi-outdoor-unit system, each outdoor unit is given an operating priority for thecontrol.Outdoor unit rotation makes it possible to change the operating priority of outdoor units.Thus, the system becomes free of compressors that stop over an extended period of time at thetime of partial loading, preventing unbalanced oil level.[Timing of outdoor unit rotation]After oil return operationAfter defrosting operationAt the beginning of the starting controlExample) The following diagram shows outdoor unit rotation in combination of 3 outdoor units.* “Master unit”, “slave unit 1” and “slave unit 2” in this section are the names for installation.They are determined in installation work, and not changed thereafter. (These names aredifferent from “master unit” and “slave unit” for control.)The outdoor unit connected the control wires (F1 and F2) for the indoor unit should bedesignated as master unitConsequently, The LED display on the main PCB for “master unit”, “slave unit 1” and “slaveunit 2” do not change. (Refer to the page 90.)orNormal operationStartingcontrolOutdoor unitrotationOil return operationor defrostingoperationPriority1Priority2Priority3Outdoor unitrotation Priority3Priority1Priority2Normal operationNormal operationOil return operationor defrostingoperationOutdoor unitrotation Priority2Priority3Priority1Normal operationPriority3Priority1Priority2Master Slave 1 Slave 2 Master Slave 1 Slave 2Master Slave 1 Slave 2 Master Slave 1 Slave 2
