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Sensi Touch Smart Thermostat | INSTALLATION GUIDE 13
SINGLE STAGE OR MULTI-STAGE SYSTEM (NO HEAT PUMP) WITH TWO TRANSFORMERS
System
Configuration
Thermostat
†
†
Two transformers systems (separate RC and RH wires), clip internal RC/RH jumper, located on back of thermostat.
HOT
120 VAC
NEUTRAL
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
NEUTRAL
24 VAC
HOT
Cooling TransformerHeating Transformer
Dots Indicate
Phased
Relationship
Dots Indicate
Phased
Relationship
Single
Stage
AC1
GA1
EL1
24 Volt
(Hot)
Cool
24 Volt
(Hot)
Heat
24 Volt
(Common)
Cool
Mode
1st stage
Blower
Circulator
Fan
Energized
On Call
For Cool
(And Heat
If Confi-
gured
For Electric
Heat)
O
Energized
Constantly
in Cool
Mode
(Factory
Default)
B
Energized
Constantly
In Heat
Mode (Or
Aux Mode)
Heat
Mode
1st Stage
Heat
Pump “L”
Terminal
Connection
Humidifier
Heat
Mode
2nd Stage
Multi-
Stage
AC2
GA2
EL2
Cool
Mode
2nd Stage
De-
humidifier
HEAT PUMP SYSTEMS
System
Configuration
Thermostat
††
†
Internal jumper between RC and RH, located on back of thermostat.
††
Common connection required on Heat-only, Cool-only or Heat Pump systems.
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
Dots Indicate
Phased
Relationship
Single
Stage
Heat
Pump
HP1
24 Volt
(Hot)
Cool
24 Volt
(Hot)
Heat
24 Volt
(Common)
Heat And
Cool Mode
1st Stage
(Com-
pressor)
NOTE: Dual
Fuel Option
De-Energizes
Heat Mode
1st Stage
Blower/
Circulator
Fan
Energized
On Call
For Cool
(And Heat If
Configured
For Electric
Heat)
O
Energized
Constantly
in Cool
Mode
(Factory
Default)
B
Energized
Constantly
In Heat
Mode (Or
Aux Mode)
Heat
Mode
1st Stage
Heat
Pump “L”
Terminal
Connection
Cool
Mode
2nd Stage
Heat
Mode
2nd Stage
Multi-
Stage
Heat
Pump
HP2
Humidifier
De-
humidifier
†
NOTES