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