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CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL 2S
HEAT STAGE 3
W/W1
RVS COOLING
O/W2
FAN
G
COOL/HEAT
Y1/W2
STAGE 1
COOL/HEAT
Y/Y2
STAGE 2
R
24 VAC HOT
24 VAC COMM
C
N/A
B
OUTDOOR
S1
SENSOR
S2
CONNECTION
H
R1
CARRIER
TYPICAL
THERMIDISTAT
FAN COIL
CONTROL
MODEL RH
RVS COOLING
O/W2
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
B
N/A
S1
OUTDOOR
SENSOR
S2
CONNECTION
See notes 7, 8, 11, 16, and 17
TYPICAL
TWO-SPEED
FAN COIL
HEAT PUMP
E
W2
W3
W2
O
G
Y1
Y2
R
R
C
C
W3
L
See notes 7, 8, 9, and 11
A
A98580
TWO-SPEED
HEAT PUMP
E
O
W3
Y1
W2
W2
Y2
W3
G
R
R
L
C
C
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
A98582
C
Fig. 8—Typical 24-v Circuit Connections
CARRIER
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
W/W1
HEAT STAGE 3
G
FAN
COOL/HEAT
Y/Y2
STAGE 2
24 VAC COMM
C
24 VAC HOT
R
RVS COOLING
O/W2
COOL/HEAT
Y1
STAGE 1
RVS HEATING
B
OUTDOOR
S1
SENSOR
CONNECTION
S2
H
R1
OTHER BRAND
TWO-SPEED
THERMOSTAT
24 VAC HOT
R
24 VAC COM
C
HEAT STAGE 3
W2
COOL/HEAT
Y2
STAGE 2
G
FAN
EMERGENCY
E
HEAT
RVS COOLING
O
COOL/HEAT
Y1
STAGE 1
H
R1
6
TYPICAL
TWO-SPEED
FAN COIL
HEAT PUMP
E
W3
W2
G
C
R
See notes 7, 8, 10, and 11
B
A98581
TYPICAL
TWO-SPEED
FAN COIL
HEAT PUMP
R
C
W2
W3
G
E
See notes 8 and 11
A97498
D
W2
Y2
C
R
O
Y1
W3
L
R
C
W2
Y2
W3
O
Y1
L
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