Honeywell Home Lyric T6 Pro Wi-Fi Professional Install Manual page 5

Wiring
NOTES:
1 Available wiring configurations differ by product models/product numbers.
2 Use 18" to 22- gauge thermostat wire. Shielded cable is not required.
3 Set the R Slider Tab on the UWP to the up position (1 wire) for 1 transformer
systems or the down position (2 wires) for 2 transformer systems. See "Setting
Slider Tabs" on page 4.
4 Set the U Slider Tab to the up position (1 wire) for non-powered ventilation or the
down position (2 wires) for powered ventilation. See "Setting Slider Tabs" on page
4.
Conventional systems
IH/IC System (1 transformer)
Hot Water Relay Panel
R Power
R Power
Rc
[R+Rc joined by Slider Tab] Rc [R+Rc joined by Slider Tab]
Y
Compressor contactor W Heat Relay
C 2^VAC common C 24VAC common
W
Heat relay
NOTE: If the panel does not provide 24 volts AC
G
Fan relay
at R and C, set the slider to down position and
wire a separate transformer to Rc and C.
IH/IC System (2 transformers)
Heat-only System with Fan
R
Power (heating transformer)
R Power
Rc
Power (cooling transformer)
Rc [R+Rc joined by Slider Tab]
Y
Compressor contactor
C 24VAC common
C
24 VAC common from cooling transformer
W Heat relay
W
Heat relay
G Fan relay
G
Fan relay
2H/2C System (1 transformer)
Cool-only System with Fan
R Power
R Power
Rc
[R+Rc joined by Slider Tab]
Rc [R+Rc joined by Slider Tab]
Y
Compressor contactor (stage 1)
Y Compressor contactor
C 24VAC common
C 24VAC common
W
Heat relay (stage 1)
G Fan relay
G
Fan relay
W2
Heat relay (stage 2)
Y2
Compressor contactor (stage 2)