18
Y
N/C
W
O/B
G
RC
RH
C
Y2
R1+
R1-
R2+
R2-
W2
AUX
EMS Si Thermostat
2-stage AC
C
Boiler
C
W
R
Y1
R
R
C
Y2
Y1
Y2
G
Air Handler
Single stage boiler with air handler, dual stage cool
* Remove RH/RC factory jumper
C terminal to be connected to heating
transformer common