Carrier SmartVu - RS485 Wiring Best Practices

10
Contact 1: G contact
SIOB1, circuit A
DI-01
J1
Used with the thermostat operating mode (TSTAT).
Contact 2: Y_Y2 contact
SIOB1, circuit A
DI-02
J1
Contact 3: O_W2 contact
SIOB1, circuit A
DI-03
J1
Contact 1: W_W1 contact
SIOB2, circuit B
DI-01
J1
SIOB2 board is used for dual-circuit unit OR unit with additional heating
stages
Contact 2: Y1_W2 contact
SIOB2, circuit B
DI-02
J1
Enthalpy contact
SIOB2, circuit B
DI-04
J1
Supply fan status contact
SIOB1, circuit A
DI-07
J1
Indoor air flow verification input
Fire contact
SIOB1, circuit A
DI-05
Fire safety input
Alarm relay output
SIOB1, circuit A
DO-05
J25
CCN network connection
SIOB1, circuit B
J4
RS-485 series connection
- Pin 1: signal +
- Pin 2: ground
- Pin 3: signal -
The following table shows the thermostat output functions depending on the unit type used.
G: indoor fan on/off.
Y: compressor 1 on/off (single-circuit unit)
Y1: compressor 1 on/off
Y2: compressor 2 on/off
W: additional heating stage 1 on/off
W2: additional heating stage 2 on/off
O: cycle reversing valve on/off (heat pump units)
TSTAT
Types
TSTAT for single-circuit cooling
only
unit
TSTAT for dual-circuit cooling
only
unit
TSTAT for single-circuit heat
pump unit
TSTAT for dual-circuit heat
pump
unit
Rooftop
inputs
Thermostat
output name
Thermostat
output function
Thermostat
output name
Thermostat
output function
Thermostat
output name
Thermostat
output function
Thermostat
output name
Thermostat
output function
G
G
G
G
G
G
G
G
G
Y1_W2
Y1_W2
Y1
Y1_W2
Y1
Y1_W2
W2
Y1_W2
Y1
Y_Y2
Y_Y2
Y2
Y_Y2
Y2
Y_Y2
Y
Y_Y2
Y2
W_W1
W_W1
W
W_W1
W
W_W1
W
W_W1
W
O_W2
O_W2
W2
O_W2
W2
O_W2
O
O_W2
O
3.5.2 - Volt-free setpoint selection contact
Occupancy type
Setpoint
Selection
Occupied
Unoccupied
Heating: frost protection
Cooling: unoccupied
Schedule
Contact 1
Open
Closed
Open
Closed
Contact 2
Open
Open
Closed
Closed
3.5.3 -Volt-free demand limit selection contact
100%
Limit
Demand limit
open
closed