Mars Comfort-Aire Century MCB18 SA Series Installation And Owner's Manual page 28

9. Operation
4. Step 4: set which machine will run rst. Select A or B.
5. After this function is turned on, as long as the air conditioner
is running at the setting hour, it will automatically turn on
another air conditioner and turn o the current air conditioner.
Press the POWER button to switch to another one immediately.
A or B icons icker to indicate the corresponding air
conditioning failure.
Automatically switch to another machine when running time is
reached or machine failure occurs.
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Wired Controller IOM - VCDxxSA