Single Stage or Multi-Stage System (No heat pump) with Two Transformers
*Two transformer systems (separate RC and RH wires), clip interna,RC/RH jumper, located on back of thermostat above battery compartment.
**Thermostat wiring does not follow a standardized color code. Label thermostat wires before removing old thermostat from the wall.
HOT
HOT
NEUTRAL
24 VAC
120 VAC
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
Single
stage
AC1
GA1
EL1
24 Volt
(Hot)
Cool
24 Volt
(Hot)
Heat
24 Volt
(Common)
Cool
Mode 1
st
stage
No
output
Heat
Mode 1
st
stage
No
output
Blower /
circulator fan
energized on
call for cool
(and heat if
configured
for electric
heat)
O
Energized
constantly
in Cool
Mode
B
Energized
constantly
in Heat
Mode (or
Aux Mode)
Heat Pump
“L” terminal
connection
Multi-
stage
AC2
GA2
EL2
Cool
Mode 2
nd
stage
Heat
Mode 2
nd
stage
*
Dots indicate
phase
relationship.
Dots indicate
phase
relationship.
THERMOSTAT
C
RC
RH
G
W2
W/E
Y2
L
O/B
Y
NEUTRAL
SYSTEM
CONFIGURATION
Sensi
TM
Wi-Fi Programmable Thermostat | INSTALLATION GUIDE
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