Carrier 38EYA Installation And Start-Up Instructions Manual page 9

CARRIER
DUAL FUEL
THERMOSTAT SINGLE-STAGE
MODEL DF
24 VAC HOT R
FAN
G
FURNACE W/W1
Y/Y2
COMPRESSOR
RVS COOLING O/W2
N/A
Y1/W2
24 VAC COM C
RVS HEATING B
RVS SENSING L
S1
OUTDOOR
SENSOR
S2
CONNECTION
Fig. 14—Typical 24-v Circuit Connection using Carrier Model DF Thermostat with Single- or 2-Stage Furnace
Fig. 15—Typical 24-v Circuit Connections using Carrier Model 2S Thermostat
HEAT PUMP
FURNACE
R
R
G
W W2
Y
Y
O
C
C
See note 7
OUTDOOR
TEMPERATURE
SENSOR
A97538
CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL 2S
R
24 VAC HOT
G
FAN
COOL/HEAT
Y/Y2
STAGE 1
HEAT STAGE 2 W/W1
Y1/W2
HEAT STAGE 3
RVS COOLING O/W2
24 VAC COMM
C
RVS HEATING B
L
TROUBLE
S1
OUTDOOR
SENSOR
CONNECTION
S2
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.
with FV4A Fan Coil and Smart Staging
CARRIER
DUAL FUEL
THERMOSTAT
MODEL DF
24 VAC HOT R
FAN
G
FURNACE LO W/W1
COMPRESSOR Y/Y2
RVS COOLING
O/W2
FURNACE HI
Y1/W2
24 VAC COM C
RVS HEATING B
L
RVS SENSING
S1
OUTDOOR
SENSOR
CONNECTION S2
FV4A HEAT
FAN COIL PUMP
DH
J1 JUMPER
R
R
G
Y
Y/Y2
REMOVE
J2 JUMPER
FOR HEAT
W1
STAGING
W2
W2
O O
C
C
Y1
9
TWO-STAGE OR
VARIABLE SPEED
FURNACE HEAT PUMP
R
R
G
W/W1
W2
Y
Y/Y2
O
O
W2
Y1
C
C
See notes 7 and 8
OUTDOOR
TEMPERATURE
SENSOR
A97539
A97565