Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 129

[6-5 Initialization Procedure for System Rotation Settings ]
3) Within 3 mins, backup unit will stop. "SR Timer (Hr)" will start counting but "SR Stop" doesn't
change at this time changes at next rotation timing.
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