has the terminal designations from the owner's guide that comes with the thermostat.
CT3611 | Typical Terminals
| From the old thermostat |Trane |
| |American |Lennox |York |General |Rheem |Function
| |Standard | | | | |
C |C |C or X |C |B |X |B |C or B |X |Common
R |R |R |R |R |V or VR|R |R |R |Power
Y |Y or Y1 |Y or Y1 |Y or Y1|Y |M |Y |Y |Y or Y1|Compressor
W1 |- |- |- |- |- |- |- |- |Stage 1 Heating Relay
W2 |W or W1 |W,W1 |W or W1|W or W1 |W1 or Y|W or W2|W or W1 |W2 |Auxiliary Heat Relay
| | or W2 |&jump U| | | | | |
G |G |G |G |G |F or G |G |G |G |Fan Relay
O |O |O |O |O |R or O |O |O |O |Cooling Changeover Relay
B |B |B |B |- |- |H |- |- |Heating Changeover Relay
L |L |L or X |L |F or L |L |F |F or L |L |System Monitor
E |E |E |E or X |X2 or E |E |X or E |E or X2 |E |Emergency Heat Relay
- |- |- |- |T or A |A |T |T |- |Not used
Never attach wires to both the O and B terminals on the CT6311,
if the old thermostat did, just attach the B wire to the C terminal on the CT6311.
If there are separate wires on the V and VR terminals, call for assistance at 1-800-468-1502.