Samsung AM***XMDCH Series Installation Manual page 38

Setting outdoor unit option switch and key function
Setting total number of installed indoor units using K1~K4
1. In the initial, display will show the following.
2. Press and hold simultaneously K1, K2 to enter the setting mode.
If you enter the setting mode, display will show the following.
3. If you want to set manually, press K2 or K4 shortly.
- K2 : 10 digit / K4 : 1 digit
Example) total number of installed indoor unit : 24
press K2 2 times, press K4 4 times.
then, display will show
4. If you want to set automatically, press and hold K4 for 2 seconds.
Display will show total number of installed indoor units.
But you have to be careful, it is displayed only for the indoor unit in which a communication and power lines are connected normally.
5. If you want to finish setting mode, press and hold K2.
And then Main PCB will be reset after display blinking in 3 seconds.
In case of inputting in the wrong way while you inputting, press "K3" (Main PCB reset) and progress again from the first step.
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K1 K2 K3 K4