Samsung ADH1800E Owner's Instructions Manual page 28

The centralized controller is an optional accessory.
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Up to sixteen air conditioners can be turned on or off by connecting to the
centralized controller. However, you cannot adjust the cooling/heating tem-
perature or set the timer with it. If you also have the wired remote controller,
CENTRALIZED CONTROL is displayed at the top of the remote controller.
To turn on the all of air conditioners connected to the centralized controller,
press the (All ON) button.
To turn on/off a specific air conditioner, press the
Result: The On/Off indicator comes on when the air conditioner is
operating.
To turn off the all of air conditioners connected to the centralized controller,
press the (All OFF) button.
(ON/OFF) button.