Carrier 38YKC Series Installation And Start-Up Instructions

Fig. 9—Typical 24-v Circuit Connections using Other HP Thermostats with Fan Coils and No Outdoor
Thermostat, 1 Outdoor Thermostat, or 2 Outdoor Thermostats
A97404
24 VAC HOT






R
C
W2
Y
G
R
W3
W2
G
RVS COOLING








E
W2
OTHER
HP THERMOSTAT

TWO
OUTDOOR
THERMOSTATS

FA, FB, FC, 
FD, FF, FH
FAN COIL
HEAT 
PUMP


C
O
R
C
O
INDOOR FAN


HEAT STAGE 2


COOL/HEAT
STAGE 1
24 VAC COM
EMERGENCY 
HEAT
Y
E

ODT


ODT

NOTE: Remove wires from crimp nut in indoor fan coil 
 when installing outdoor thermostats.

IMPORTANT: When using outdoor thermostats, W
2
must be
 energized when requesting supplemental heat.



EHR


EHR


EHR

*
*
*
IF AVAILABLE


*
A97374
24 VAC HOT






R
C
W2
Y
G
R
C
RVS COOLING








C
W2
OTHER
HP THERMOSTAT

FA, FB, FC, 
FD, FF, FH
FAN COIL
HEAT 
PUMP


G
O
E
W2
E
W3
R
Y
24 VAC COM


HEAT STAGE 2


COOL/HEAT
STAGE 1
INDOOR FAN
EMERGENCY
HEAT
O
*
*
*
IF AVAILABLE


*
A98630
24 VAC HOT
R
C
W2
Y
G
R
DH
C
RVS COOLING
C
W2
OTHER
HP THERMOSTAT
40FKA
FK4C
FAN COIL
HEAT
PUMP
G
Y/Y2
O
Y1
O
E
W1
W2
R
Y
24 VAC COM
HEAT STAGE 2
COOL/HEAT
STAGE 1
INDOOR FAN
EMERGENCY
HEAT
O
J1 JUMPER
J2 JUMPER
A97403
24 VAC HOT






R
C
W2
Y
G
R
W3
W2
E
G
RVS COOLING








E
W2
OTHER
HP THERMOSTAT

ONE
OUTDOOR
THERMOSTAT

FA, FB, FC,
FD, FF, FH
FAN COIL
HEAT 
PUMP


C
O
R
C
O
INDOOR FAN


HEAT STAGE 2


COOL/HEAT
STAGE 1
24 VAC COM
EMERGENCY
HEAT
Y

ODT

NOTE: Remove wires from crimp nut in indoor fan coil 
 when installing outdoor thermostat.

IMPORTANT: When using outdoor thermostat, W
2
must be
 energized when requesting supplemental heat.


6

Carrier 38YKC Series Specifications

General

Brand	Carrier
Model	38YKC Series
Category	Heat Pump
Language	English