Samsung AM CNB C AA Series Technical Data Book page 70

13. Installation
❋ Connect B12/B13 (3 Way valve 2) of the terminal block to use the defrost mode contact output .
L
Connecting 2Way valve
▶ Connect a 2Way valve to B15, B16 and B17 of the PBA terminal block .
▶ 2Way valve is interlocked with 3Way valve 1.
L
❋ Initially, relay is connected between L and B17 of the terminal block .
N
Defrost signal
contact
N
AC 220 - 240 V
2Way valve
V2
V1
V2
V1