Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 126

[6-5 Initialization Procedure for System Rotation Settings ]
3) Switch SW9 to "Local" on all the units and run all units other than control unit (IC1) via remote
controller.
Then run control unit (IC1) in test run mode, and switch SW9 to "Normal" on all the units.
4) Within 3 minutes, backup unit will automatically stop.
BS_06_C
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