4
6
Review the wiring chart information.
a. Refer to:
• Chart 1 - If you do NOT have a heat pump
• Chart 2 - If you have a heat pump
b. Select the correct row based upon the thermostat being replaced, and then circle the wire labels you have.
c. Connect your wires as shown in the New Thermostat Terminals row.
Chart 1: Gas or Electric
(Single Stage or Multistage)
Themostat Being Replaced Wire Labels
All Brands C
X
B
R
RC
RH W
W1
W2 G
F
Y
Y1
Y2
Connects to
New Thermostat Terminals 24COM 24RC 24RH W1 W2/O/B G Y1 Y2
Chart 2: Heat Pump
(Single Stage or Multistage)
Themostat Being Replaced Wire Labels
Trane/American Standard
(Weathertron) or York
COM
C
B
R
RC
RH E
X2
W
W1
W2
Y
AUX
O G Y
Y1
Y2
Other Brands COM
C
X
R
RC
RH E
X2
W
W1
W2
Y
AUX
O
B
G
F
Y
Y1
Y2
Lennox C
X
R
RC
**VR
**V
RH E
X2
W
W1
W2
Y
AUX
O
**R
G
F
Y
Y1
Y2
Connects to
New Thermostat Terminals 24COM 24RC 24RH *W1 W2/O/B G Y1 Y2
* Connect two wires to the W1 terminal
** If your existing thermostat has a “V” or “VR” wire label, connect that wire to “24RC” on the new thermostat, then connect the wire labeled
“R” to “W2/O/B” on the new thermostat
Some wire terminals
may not be used
Some wire terminals
may not be used
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