Wiring Diagram Notes - Carrier 38YRA Installation And Start-Up Instructions Manual

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
RVS HEATING B
RVS SENSING L
S1
OUTDOOR
SENSOR
CONNECTION S2
Fig. 14—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 BEGINNING WITH 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. A LIQUID-LINE SOLENOID VALVE IS REQUIRED ON SOME
UNITS.
5. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE
COMPRESSOR CYCLE PROTECTION AND 4 CYCLES PER HR
LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR
DETAILS.
6. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR
THERMOSTAT INSTALLATION INSTRUCTIONS.
7. FOR DUAL FUEL THERMOSTATS, UNDERLINED LETTER ON
DUAL TERMINAL INDICATES ITS USAGE.
FOR EXAMPLE: O/W2 MEANS O
O/W2 MEANS W2
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.
SINGLE-STAGE
FURNACE HEAT PUMP
R
R
G
W W2
Y
Y
O
C
C
See note 7
OUTDOOR
TEMPERATURE
SENSOR
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
A97538
ODT
EHR
SHR
10
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
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
SUPPLEMENTAL HEAT RELAY
HEAT PUMP
R
W2
Y
O
C
A97539
A97413