Emerson ST55 Sensi Wi-Fi Programmable Thermostat Installation Guide
Single stage or multi-stage system (no heat pump) with two transformers
THERMOSTAT
*
RC
RH
C
Y
Y2
O/B
L
SYSTEM
CONFIGURATION
O
Single
stage
AC1
No
No
Energized
constantly
in Cool
Mode
output
output
Blower /
circulator fan
energized on
call for cool
(and heat if
configured
for electric
heat)
Heat Pump
“L” terminal
connection
GA1
24 Volt
(Hot)
Cool
24 Volt
(Hot)
Heat
24 Volt
Cool
Mode 1st
stage
Heat
Mode 1st
stage
EL1
(Common)
B
Multi-
stage
AC2
GA2
EL2
Energized
constantly
in Heat
Cool
Mode 2nd
stage
Heat
Mode 2nd
stage
Mode (or
Aux Mode)
Dots indicate
Dots indicate
phase
relationship.
phase
relationship.
NEUTRAL
24 VAC
HOT
HOT
120 VAC
NEUTRAL
24 VAC
HOT
HOT
120 VAC
NEUTRAL
NEUTRAL
*Two transformer systems (separate RC and RH wires), clip interna,RC/RH jumpe,rlocated 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.
SensiTM Wi-Fi Programmable Thermostat | INSTALLATION GUIDE
14
| General | Details |
|---|---|
| Name | Emerson ST55 Sensi Wi-Fi Programmable Thermostat Installation Guide |
| Make | Emerson |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.25 MB |

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