Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 127

[6-5 Initialization Procedure for System Rotation Settings ]
5) Rotation will be performed after 3 minutes, "SR Stop" changes to 0 on backup unit and "SR Timer
(Hr)" will start counting.
Then the system goes to normal operation with system rotation, next rotation will be performed
after 480hrs.
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chapter 6 BS_06_C