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CARRIER
TWO-STAGE
PROGRAMMABLE
VARIABLE-SPEED
THERMOSTAT
FURNACE WITH ICM
MODEL 2S
BLOWER MOTOR
COOL/HEAT
Y1/W2
STAGE 1
FAN
G
HEAT STAGE 3
W/W1
COOL/HEAT
Y/Y2
STAGE 2
RVS COOLING
O/W2
24 VAC HOT
R
24 VAC COMM
C
N/A
B
S1
OUTDOOR
SENSOR
S2
CONNECTION
See notes 6, 7, 9, 11, 12, 14, 21 and 24
CARRIER
PROGRAMMABLE
DUAL FUEL
THERMOSTAT
MODEL DF
24 VAC HOT
R
FAN
G
HEAT STAGE 3
W/ W1
(FURNACE)
COOL/HEAT
Y/ Y2
STAGE 2
(COMPRESSOR HI)
RVS COOLING
O/W2
COOL/HEAT
Y1/W2
STAGE 1
(COMPRESSOR LO)
24 VAC COMM
C
N/A
B
RVS SENSING
L
S1
OUTDOOR
SENSOR
S2
CONNECTIONS
See notes 7, 11, 12, 14, 15, 21 and 26
TWO-SPEED
HEAT PUMP
Y1 *
Y1
G
W/W1
W2
Y/Y2
Y2
O
R
R
W2
C
C
W3
L
T
TWO-STAGE
OR VARIABLE
TWO-SPEED
HEAT PUMP
SPEED FURNACE
R
R
G
W/W1
W2
Y2
Y/Y2
O
*
Y1
Y1
W2
W3
C
C
OUTDOOR
SENSOR
V
Fig. 8—Typical 24-v Circuit Connections (Continued)
CARRIER
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
24 VAC HOT
24 VAC COMM
HEAT STAGE 3
COOL/HEAT
STAGE 2
FAN
RVS COOLING
COOL/HEAT
STAGE 1
N/A
OUTDOOR
SENSOR
CONNECTION
A98593
OTHER BRAND
TWO-SPEED
THERMOSTAT
24 VAC HOT
24 VAC COM
HEAT STAGE 3
COOL/HEAT
STAGE 2
FAN
EMERGENCY
HEAT
RVS COOLING
COOL/HEAT
STAGE 1
See notes 6, 7, 11, 12, 14, 21 and 24
A98595
11
TWO-STAGE
VARIABLE-SPEED
FURNACE WITH ICM
BLOWER MOTOR
R
R
C
C
W/W1
W/W1
Y/Y2
Y/Y2
G
G
W2
O/W2
*
Y1
Y1
B
S1
See notes 6, 7, 10, 11,12, 14, 21, and 24
S2
U
TWO-STAGE
VARIABLE-SPEED
FURNACE WITH ICM
BLOWER MOTOR
R
R
C
C
W2
W/W1
Y2
Y/Y2
G
G
E
W2
O
*
Y1
Y1
W
TWO-SPEED
HEAT PUMP
R
C
W2
Y2
W3
O
Y1
L
A98594
TWO-SPEED
HEAT PUMP
R
C
W2
Y2
W3
O
Y1
L
A97496
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