Samsung SINGLE CNH ZDK Series Technical Data Book page 61

Installation
Communication wiring connections
Communication wires connect through side of air handler.
Use an approved connector at the cabinet of the unit to prevent pulling or shorting of control wires.
Control wire must be rated for 600V minimum.
Control wire insulation must be rated for temperatures up to 90°C.
ATTENTION
1. Insert the wires through the holes of the right side on the top casing and through the cable connectors.
2. Connect the communication wires to the F1/F2 connection terminal with compressed ring terminals.
3. Connect F3, F4 (for communication) when installing the wired remote control.
PBA ground screw/connection to chassis
F1/F2 communication connection terminals
Supply power ground connection point
1(L)/2(N) high voltage connection terminals