Uni-Line Smart Sense SMART 3000 Quick Start Manual page 7

Wiring
Terminal
C
R
Hi
med
Low
Y
W - O/B
A1 – Cool
A2 – Heat
A3 – Fan
Com – 0V
A
B
SI
DI
Function
24V Common or Neutral
24V AC - This voltage is switched back through the relays
Indoor Fan High Speed (NOT Used in Single fan speed mode -
Sw 1 = OFF)
Indoor Fan medium Speed (NOT Used in Single fan speed mode -
Sw 1 = OFF)
Indoor Fan Low Speed (Used in single and three fan speed mode)
Compressor or Cool - (Based on Sw 2 setting)
Reversing Valve or Heat - (Based on Sw 2 setting)
0 to 10V Output for Cooling (Typically used to control modulating valves)
0 to 10V Output for Heating (Typically used to control modulating valves)
0 to 10V modulating Output for Indoor DC Fan
0V terminal - Used for 0 to 10V, sensor or digital inputs ground reference
modBus Data A
modBus Data B
Remote temperature sensor input (Remote/average/modBus data use)
Digital (Switched input) for forced unoccupied or initiate doorbell
function
7