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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. 13—Typical 24-v Circuit Connections using Carrier Model DF Thermostat with Single- or 2-Stage Furnace
WIRING DIAGRAM NOTES:
1. CARRIER THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCU-
RATE FOR MODEL NUMBERS TSTAT _ _ _ _ _ _ _.
2. WIRING MUST CONFORM TO NEC OR LOCAL CODES.
3. SOME UNITS ARE EQUIPPED WITH PRESSURE SWITCH(ES), TEM-
PERATURE SWITCH, OR 5-MINUTE COMPRESSOR CYCLE PRO-
TECTION. CONNECT 24-V FIELD WIRING TO FACTORY-
PROVIDED STRIPPED LEADS.
4. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE
COMPRESSOR CYCLE PROTECTION AND 4 CYCLES PER HR
LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR
DETAILS.
5. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR
THERMOSTAT INSTALLATION INSTRUCTIONS.
6. UNDERLINED LETTER ON DUAL TERMINAL INDICATES ITS
USAGE.
FOR EXAMPLE: O/W2 MEANS O: O/W2 MEANS W2
7. OUTDOOR TEMPERATURE SENSOR MUST BE ATTACHED IN ALL
DUAL FUEL INSTALLATIONS.
JUMPER WIRE BETWEEN O/W2 AND L THERMOSTAT TERMI-
NALS MUST BE PRESENT.
8. Y1 AND O CONNECTIONS TO 2-STAGE FURNACES MAY NOT
EXIST OR MAY ONLY BE A WIRE RATHER THAN A SCREW
TERMINAL.
HEAT PUMP
FURNACE
R
R
G
W
W2
Y
Y
O
C
C
See note 7
OUTDOOR
TEMPERATURE
SENSOR
A97538
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
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
ODT
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
EHR
SUPPLEMENTAL HEAT RELAY
SHR
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
LEGEND
A97413
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