Terminal Designations; Wiring Configurations - Honeywell Home Round Smart Thermostat Guía De Instalación Profesional

Wiring

Terminal Designations

L Heat pump system monitor
C Common wire from secondary side of
cooling transformer, if 2 transformers
W2 2nd stage heat relay (heat pump
(AUX) auxiliary, emergency heat)
W 1st stage heat relay (changeover valve
(O/B) for heat pumps)
U1 Terminal for indoor air quality products
(humidifier, dehumidifier, ventilator)
U2
Terminal for indoor air quality products
(humidifier, dehumidifier, ventilator)

Wiring Configurations

Two stage furnace and air-conditioning
C Common wire (optional)
W2 Heat relay (stage 2)
W
Heat relay
G Fan relay
Y2
Compressor contactor (stage 2)
Y Compressor contactor (stage 1)
R
Power
8
K Optional C-wire adaptor
G Fan relay
Y2 2nd stage compressor contactor
Y 1st stage compressor contactor
R Heating power. Connect to
secondary side of heating system
transformer
Rc
Cooling power. Connect to
secondary side of cooling
system transformer
Notes
• Thermostat C wire
is optional for this
application. C wire
required if Homekit
is used.
• Set the R Jumper
Switch on the wall
plate to R