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CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL HP
24 VAC HOT
R
G
INDOOR FAN
HEAT STAGE 2
W/W1
COOL/HEAT
Y/Y2
STAGE 1
O/W2
RVS COOLING
NOT USED
Y1/W2
C
24 VAC COM
NOT USED
B
L
TROUBLE
S1
OPTIONAL
OUTDOOR
SENSOR
S2
CONNECTION
FA, FB, FC, FH
CARRIER
PROGRAMMABLE
FAN COIL WITH
SMART HEAT
THERMOSTAT
MODEL HP
24 VAC HOT
R
G
INDOOR FAN
SHR
W/W1
HEAT STAGE 2
COOL/HEAT
Y/Y2
STAGE 1
RVS COOLING
O/W2
NOT USED
Y1/W2
24 VAC COM
C
NOT USED
B
TROUBLE
L
S1
OPTIONAL
OUTDOOR
SENSOR
S2
CONNECTION
Fig. 11—Typical 24-v Circuit Connections using Carrier Model HP Thermostat with Smart Heat and No Outdoor
Thermostat, 1 Outdoor Thermostat, or Supplemental Heat Relay and Carrier Model 2S Thermostat with FK4C
FA, FB, FC, FH
FAN COIL WITH
HEAT
SMART HEAT
PUMP
R
R
C
C
Y
G
O
O
W2
W2D
JW1
W2T
W3
Y
Y
0
HEAT
PUMP
SUPPLEMENTAL
HEATING
RELAY
R
R
C
C
Y
G
O
O
W2
W2D
CUT
JW1
W2T
SHR
ODT
W3
Y
Y
0
Fan Coil and Smart Staging
CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL HP
24 VAC HOT
INDOOR FAN
HEAT STAGE 2
COOL/HEAT
STAGE 1
RVS COOLING
NOT USED
24 VAC COM
NOT USED
TROUBLE
OPTIONAL
OUTDOOR
SENSOR
CONNECTION
CARRIER
PROGRAMMABLE
THERMOSTAT
A97541
MODEL 2S
24 VAC HOT
FAN
COOL/HEAT
STAGE 1
HEAT STAGE 2
HEAT STAGE 3
RVS COOLING
24 VAC COMM
RVS HEATING
TROUBLE
OUTDOOR
SENSOR
CONNECTION
Smart Sequencing Application: Model 2S thermostat with
switch C OFF and switch D ON uses single-speed heat pump,
FK4 fan coil with selected 2:1 size ratio heaters. Provides 3
stages of auxiliary heat for even heating comfort via W/W1
and Y1/W2. Refer to FK4 Installation Instructions.
A97543
7
FA, FB, FC, FH
ONE
FAN COIL WITH
OUTDOOR
SMART HEAT
THERMOSTAT
R
R
G
C
W/W1
Y
Y/Y2
G
O/W2
O
Y1/W2
W2D
CUT
JW1
C
W2T
ODT
B
W3
L
Y
0
S1
S2
FK4C
FAN COIL
DH
J1 JUMPER
R
R
G
G
Y/Y2
Y/Y2
REMOVE
J2 JUMPER
FOR HEAT
W/W1
W1
STAGING
Y1/W2
W2
O/W2
O
C
C
B
Y1
L
S1
S2
HEAT
PUMP
R
C
O
W2
Y
A97542
HEAT
PUMP
R
Y
W2
O
C
A97540
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