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Sensi Lite smart thermostat | INSTALLATION GUIDE 10
CONVENTIONAL SINGLE-STAGE OR MULTI-STAGE SYSTEMS (NO HEAT PUMP)
System
configuration
Thermostat
Single-stage
(AC, GA, EL)
Multi-stage - 2H or 2C*
(AC2, GA2, EL2)
2nd-stage heat, 2nd-stage cool, zone
panel, or 3-wire hot water zone valve
connection (configurable as O, B,
multi-stage or 6 in the installer menu)
1st-stage cool
Indoor blower
(fan)
1st-stage heat
Common wire**
(24V)
24VAC power from HVAC system
*System only capable of multi-stage heating or multi-stage cooling, not both.
**
Common connection required on heat-only, cool-only or heat pump systems.
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
Dots indicate
phased
relationship
Thermostat
HEAT PUMP SYSTEMS
Heat pump changeover (reversing
valve) connection (configure as O or B
in the installer menu). Multi-stage
not available for heat pump
configurations.
1st-stage heat and cool
(compressor)
1st-stage auxiliary/emergency heat
(2nd-stage heat)
24VAC power from HVAC system
*Common connection required on heat-only, cool-only or heat pump systems.
HOT
120 VAC
NEUTRAL
NEUTRAL
24 VAC
HOT
Dots indicate
phased
relationship
Common wire*
(24V)
Indoor blower
(fan)
System
configuration
(Outdoor) HP, (Indoor) GA or EL.
(Reversing valve setup) O or B
NOTES