Mitsubishi Electric MR. SLIM PKA Series Service Manual page 31

System constraint
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11-1-2. How to set rotation function (Back-up function, 2nd stage cut-in function)
(1) Request Code List
2
OCH637
:
[2nd stage cut-in function]··· Request code number "322–324"
Start operation
Main
unit
IC-1
Sub
unit
IC-2
Room temp. ] Set point
Sub unit start operation
Run
Stop Run
Room temp. < Set point 7.2°F [ 4:]
Sub unit stop
Stop