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CARRIER
DUAL FUEL
THERMOSTAT
MODEL DF
24 VAC HOT
R
FAN
G
FURNACE
W/W1
COMPRESSOR
Y/Y2
RVS COOLING
O/W2
N/A
Y1/W2
24 VAC COM
C
B
RVS HEATING
RVS SENSING
L
S1
OUTDOOR
SENSOR
CONNECTION
S2
Fig. 10—Typical 24-v Circuit Conncetion using Carrier Model DF Thermostat with Single- or 2-Stage Furnace
ACCESSORY
Crankcase Heater
Evaporator Freeze Thermostat
Accumulator
Compressor Start Assist
Capacitor and Relay
Low-Ambient Controller,
MotorMaster® Control,
or
Low-Ambient Pressure Switch
Wind Baffle
Unit Risers
Liquid-Line Solenoid Valve
or
Hard Shutoff TXV
Ball Bearing Fan Motor
* For tubing line sets between 50 and 175 ft, refer to Residential Split System Long-Line Application Guideline.
† For buried line applications, refer to Residential Split System Buried-Line Application Guideline.
‡ Required for Low-Ambient Controller (full modulation feature) and MotorMaster Control only.
SINGLE-STAGE
HEAT PUMP
FURNACE
R
R
G
W
W2
Y
Y
O
C
C
See note 7
OUTDOOR
TEMPERATURE
SENSOR
→ Table 2—Accessory Usage
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
See Low-Ambient Instructions
Recommended
CARRIER
DUAL FUEL
THERMOSTAT
MODEL DF
24 VAC HOT
FAN
FURNACE LO
COMPRESSOR
RVS COOLING
FURNACE HI
24 VAC COM
RVS HEATING
RVS SENSING
OUTDOOR
SENSOR
CONNECTION
A97638
REQUIRED FOR
APPLICATIONS*
Yes
Yes
No
Yes
Yes
No
Yes‡
6
TWO-STAGE OR
VARIABLE SPEED
FURNACE
R
R
G
G
W/W1
W/W1
Y/Y2
Y/Y2
O
O/W2
W2
Y1/W2
Y1
C
C
B
See notes 7 and 8
L
S1
OUTDOOR
TEMPERATURE
S2
SENSOR
REQUIRED FOR
LONG-LINE
BURIED LINE
APPLICATIONS†
(OVER 50 FT)
Yes
No
No
Yes
No
No
No
See Long-Line
Application
Guideline
No
HEAT PUMP
R
W2
Y
O
C
A97539
(OVER 3 FT)
Yes
No
Yes
Yes
No
No
No
Yes
No
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