Samsung AM072BXV Series Service Manual page 309

Key Options
8-5 Applications (cont.)
8-5-4 Application of Mode select Switch (cont.)
■ Connecting the Mode Select switch to the outdoor unit's Main PBA
Pin1-2
Short
Open
Open
Cooling
only
Cooling/
Heating
Operation
The mode select switch is a control option for a heat pump unit.
It is set to operate as follows:
• If set to Cool, the outdoor unit operates in cooling mode only.
• If set to Heat, the outdoor unit operates in heating mode only.
• If set to Auto, the local wired or wireless remote control determines the operating mode (heat/cool) of the outdoor unit.
Samsung Electronics
Outdoor unit's Main PBA
How to use the Mode Select switch
Pin2-3
Open
Short
Open
Red
Heating
only
Option switch (CN902)
Use Option setting to enable
cooling or heating mode.
State
Cooling only
Heating only
Cooling/Heating
White
Blue
CN902
Connector on
outdoor unit PBA
303