Table of Contents
Advertisement
6
Review the wiring chart information.
a.
Refer to:
Chart 1 - Gas furnace or air handler with electric heat
Chart 2 - 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 after completing steps 7 through 11. (Wiring
diagrams have been provided for reference on pages 7 through 9.)
Chart 1: Gas furnace or air handler
with electric heat
(Single Stage or Multistage)
Thermostat Being Replaced
All Brands
New Thermostat Terminals
Chart 2: Heat Pump
(Single Stage or Multistage)
Thermostat Being Replaced
Trane/American Standard (Weathertron)
or York
Other Brands
Lennox
New Thermostat Terminals
* 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
7
Remove existing wall plate.
Note: During this process, make sure that the wires do
not pull back into wall opening.
a.
Detach all wires from wall plate.
b.
Remove all screws attaching the wall plate to the
wall and remove wall plate.
c.
See "MERCURY NOTICE" on page 1.
C
X
B
Connects to
24C
Some wire terminals may not be used
COM
C
B
COM
C
X
C
X
Connects to
24C
Some wire terminals may not be used
Wire Labels
R
RH
W
RC
W1
24RC
24RH
W1
Wire Labels
R
RH
E
W
RC
X2
W1
W2
Y
AUX
R
RH
E
W
RC
X2
W1
W2
Y
AUX
R
RH
E
W
RC
X2
W1
**VR
W2
**V
Y
AUX
24RC
24RH
*W1
W2
G
Y
F
Y1
W2/O/B
G
Y1
O
G
Y
Y1
O
G
Y
B
F
Y1
O
G
Y
**R
F
Y1
W2/O/B
G
Y1
Wall plate
Y2
Y2
Y2
Y2
Y2
Y2
4
Advertisement
Table of Contents
