Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 125

[6-5 Initialization Procedure for System Rotation Settings ]
4. Sample maintenance tool screen during system rotation setting
(1) Using test run mode
Using test run mode for the setting of system rotation is recommended because you can demonstrate
the rotation in a short time.
1) Before setting is started, default value of "SR Stop" is 1. (It depends on previous status)
2) Turn DipSW 5-10 ON on control unit (#51), then "SR Backup unit" and "SR units" changes.
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chapter 6 BS_06_C