Carrier 38YKC Series - Wiring Diagram Notes

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.
Fig. 12—Typical 24-v Circuit Connections using Carrier Model DF Thermostat with Single- or 2-Stage Furnace
A97538
G
R
Y/Y2
O/W2
CARRIER
DUAL FUEL
THERMOSTAT
MODEL DF

SINGLE-STAGE
FURNACE
HEAT PUMP
G
Y
W
C
Y
R
O
W2
Y1/W2
C
B
L
S1
S2
R
C
FURNACE

COMPRESSOR
FAN
24 VAC HOT
24 VAC COM
N/A
RVS HEATING
RVS SENSING
OUTDOOR
SENSOR
CONNECTION
OUTDOOR
TEMPERATURE
SENSOR
W/W1
See note 7
RVS COOLING
G
R
Y/Y2
O/W2
CARRIER
DUAL FUEL
THERMOSTAT
MODEL DF

TWO-STAGE OR
VARIABLE SPEED
FURNACE
HEAT PUMP
G
C
Y
R
O
W2
Y1/W2
C
B
L
S1
S2
R
C
O
W2
Y1
FURNACE LO

COMPRESSOR
FAN
24 VAC HOT
24 VAC COM
FURNACE HI
RVS HEATING
RVS SENSING
OUTDOOR
SENSOR
CONNECTION
OUTDOOR
TEMPERATURE
SENSOR
W/W1W/W1
Y/Y2
See notes 7 and 8
RVS COOLING
A97539
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
SUPPLEMENTAL HEAT RELAY

SHR


EHR


ODT

A97413
9