Wiring Diagram Notes - Carrier Programmable Dual Fuel Thermostats Installation, Start-Up, And Operating Instructions Manual

DUAL FUEL
SINGLE-STAGE
THERMOSTAT
24 VAC HOT
R
G
FAN
W/W1
FURNACE
Y/Y2
COMPRESSOR HI
RVS COOLING
O/W2
Y1/W2
COMPRESSOR LO
C
24 VAC COM
B
RVS HEATING
RVS SENSING
L
OUTDOOR
S1
SENSOR
CONNECTION
S2
Fig. 4—Single-Stage Furnace with
2-Speed Heat Pump

WIRING DIAGRAM NOTES:

1. Underlined letter on dual terminal indicates its usage.
For Example: O/W2 means O,
O/W2 means W2.
Outdoor Temperature Sensor must be attached in all dual fuel
installations.
Jumper wire between O/W2 and L thermostat terminals
MUST be present.
2. Y1 and O connections to 2-stage furnaces MAY NOT EXIST,
or may be only a wire rather than a screw terminal.
TWO-SPEED
FURNACE HEAT PUMP
R
R
G
W2
W
Y
Y2
O
Y1
W3
C
C
SEE NOTE 1
OUTDOOR
TEMPERATURE
SENSOR
A95217
DUAL FUEL
THERMOSTAT
R
24 VAC HOT
G
FAN
FURNACE
W/W1
COMPRESSOR
Y/Y2
HI
O/W2
RVS COOLING
COMPRESSOR Y1/W2
LO
24 VAC COM C
RVS HEATING
B
RVS SENSING
L
OUTDOOR
S1
SENSOR
CONNECTION
S2
Fig. 5—Two-Stage or Variable-Speed Furnace with
2-Speed Heat Pump
6
TWO-STAGE OR
TWO-SPEED
VARIABLE SPEED HEAT PUMP
FURNACE
R
R
G
W2
W/W1
Y/Y2
Y2
O
O
Y1
Y1
W2
W3
C
C
SEE NOTES 1 AND 2
OUTDOOR
TEMPERATURE
SENSOR
A95218