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CARRIER
PROGRAMMABLE
THERMOSTAT
FURNACE WITH PSC
MODEL 2S
BLOWER MOTOR
COOL/HEAT
Y1/W2
STAGE 1
FAN
G
W/W1
HEAT STAGE 3
COOL/HEAT
Y/Y2
STAGE 2
RVS COOLING
O/W2
24 VAC HOT
R
24 VAC COMM
C
N/A
B
S1
OUTDOOR
SENSOR
CONNECTION
S2
H
R1
CARRIER
THERMIDISTAT
CONTROL
MODEL RH
BLOWER MOTOR
O/W2
RVS COOLING
COOL/HEAT
Y1/W2
STAGE 1
W/ W1
HEAT STAGE 3
COOL/HEAT
Y/ Y2
STAGE 2
FAN
G
24 VAC HOT
R
24 VAC COMM
C
DHUM
N/A
HUM
HUMIDIFY
N/A
B
S1
OUTDOOR
SENSOR
S2
CONNECTION
See notes 7, 11, 12, 14, 15, 16,
TWO-STAGE
TWO-SPEED
HEAT PUMP
Y1 *
Y1
G
W/W1
W2
Y2
O
R
R
W2
C
C
Y/Y2
W3
L
See notes 6, 7, 9, 11, 12,
14, 21, and 24
P
TWO-STAGE
FURNACE
WITH PSC
TWO-SPEED
HEAT PUMP
O
*
Y1
Y1
W2
W/W1
Y2
Y/Y2
G
R
R
W2
C
C
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
17, 18, 21, and 25
R
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
H
R1
A98590
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
H
A98592
R1
10
TWO-STAGE
FURNACE WITH PSC
BLOWER MOTOR
R
R
C
C
W/W1
W/W1
Y/Y2
G
G
W2
Y/Y2
O/W2
*
Y1
Y1
B
S1
S2
See notes 6, 7, 10, 11, 12,
14, 21, and 24
Q
TWO-STAGE
FURNACE WITH PSC
BLOWER MOTOR
R
R
C
C
W/W1
W2
Y2
G
G
Y/Y2
E
O
W2
*
Y1
Y1
See notes 6, 11, 12, 14, 21, and 24
S
TWO-SPEED
HEAT PUMP
R
C
W2
Y2
W3
O
Y1
L
A98591
TWO-SPEED
HEAT PUMP
R
C
W2
Y2
W3
O
Y1
L
A97497
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