Source 1 S1-TBSU304-S Owner's Manual & Installation Instructions page 15

Installation Instructions
Wire Connections
If the terminal designations on your old thermostat do not match those
on the new thermostat,
diagrams that follow.
Wire from the
old thermostat
terminal marked
G or F
Y1, Y
W1, W
Rh, R, M, Vr, A
C
O/B
W2
Y2
H, Hum
D, Dehum
Ck1
CKGND
* O/B is used if your system is a Heat Pump.
refer to the chart below or the wiring
Function
Fan
Cooling
Heating
Power
Common
Rev. Valve
2nd Stage Heat
2nd Stage Cooling
Humidity
Dehumidity
Dry Contact Switch
Dry Contact Switch
10
Install on the
new thermostat
connector marked
G
Y1
W1/0/B
R
C
W1/O/B*
W2
Y2
HUM
DEHUM
DRY CONTACT
DRY CONTACT