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CARRIER
PROGRAMMABLE
40FKA
THERMOSTAT
FK4C
MODEL 2S
FAN COIL
DH
24 VAC HOT
R
FAN
G
COOL/HEAT
Y1
Y1/W2
STAGE 1
RVS COOLING
O/W2
COOL/HEAT
Y/Y2
Y/Y2
STAGE 2
HEAT STAGE 3
W/W1
W1
W2
24 VAC COMM
C
N/A
B
S1
OUTDOOR
SENSOR
CONNECTION
S2
CARRIER
THERMIDISTAT
CONTROL
MODEL RH
FAN COIL
O/W2
RVS COOLING
COOL/HEAT
Y1/W2
STAGE 1
W/W1
HEAT STAGE 3
COOL/HEAT
Y/Y2
STAGE 2
G
FAN
24 VAC HOT
R
DHUM
DEHUMIDIFY
24 VAC COMM
C
HUM
HUMIDIFY
B
N/A
S1
OUTDOOR
SENSOR
S2
CONNECTION
See notes 7, 8, 11, 13, 16, 17, and 23
TWO-SPEED
HEAT PUMP
J1
JUMPER
R
R
G
Y1
O
O
Y2
W2
J2 JUMPER
W3
C
C
L
See notes 7, 8, 9, 11, and 23
E
40FKA
FK4C
TWO-SPEED
HEAT PUMP
O
O
Y1
Y1
W2
W1
J2 JUMPER
W2
Y2
Y/Y2
G
R
R
REMOVE J1
DH
W3
C
C
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
G
Fig. 8—Typical 24-v Circuit Connections (Continued)
CARRIER
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
24 VAC HOT
24 VAC COMM
FAN
COOL/HEAT
STAGE 2
HEAT STAGE 3
RVS COOLING
COOL/HEAT
STAGE 1
N/A
OUTDOOR
SENSOR
CONNECTION
A98583
OTHER BRAND
TWO-SPEED
THERMOSTAT
24 VAC HOT
24 VAC COM
FAN
COOL/HEAT
STAGE 2
HEAT STAGE 3
EMERGENCY
HEAT
RVS COOLING
COOL/HEAT
STAGE 1
A98585
7
40FKA
FK4C
FAN COIL
DH
J1 JUMPER
R
R
C
C
G
G
Y/Y2
Y/Y2
W/W1
W1
J2 JUMPER
W2
O/W2
O
Y1
Y1
B
S1
See notes 7, 8 ,10, 11 and 23
S2
F
40FKA
FK4C
FAN COIL
DH
J1 JUMPER
R
R
C
C
G
G
Y/Y2
Y2
W1
W2
J2 JUMPER
W2
E
O
O
Y1
Y1
See notes 8, 11, and 23
H
TWO-SPEED
HEAT PUMP
R
C
Y2
W3
W2
O
Y1
L
A98584
TWO-SPEED
HEAT PUMP
R
C
Y2
W2
W3
O
Y1
L
A98628
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