Samsung AC024BXUPCH/AA Technical Data Book page 58

11. Installation
AHU Control Unit
6 Connect the wires to the corresponding terminal blocks.
Name
Terminal Block
Connector
Compression ring terminal specifications for connection to the AHU Control Unit (ACU) PCB.
F1 Outdoor unit communication
F2 Outdoor unit communication
F3 Reserved
F4 Reserved
Y1 Compressor Stage 1
Y2 Compressor Stage 2
G Indoor fan
W1 Auxiliary heater Stage 1
W2 Auxiliary heater Stage 2
D Dehumidification
D/B 4-way reversing valve
R AC Power 24 V
C AC Power 24 V
G1 Fan speed (step) control, YEL
G2 Fan speed (step) control, BLU
G3 Fan speed (step) control, RED
Description