11
Y
R
W
G
R
1-stage AC
C
24V
Y
G
R
W
C
HUM
1-stage Furnace
Original Thermostat
Y
N/C
W
O/B
G
RC
RH
C
Y2
W2
AUX
1-stage AC
C
24V
Y
G
R
W
C
HUM
1-stage Furnace
Smart Si Thermostat
Use jumper
wire included
in box
Repurpose G
wire as C wire
Use jumper wire included in box to connect Y and G on the furnance
Repurpose the original G wire as C wire. Note that the furnance controls the fan in this
configuration.
Single stage heat/cool with 4 wires at thermostat
Before
After
Summary of Contents for Smart Si
Page 2: ...Smart Si Thermostat Installation Manual ...
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