Carrier 38YDA, Installation And Start-Up Instructions Manual, Page: 8 / 20

Fig. 8—Typical 24-v Circuit Connections (Continued)
J
A98586
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 2
R
W/W1
Y/Y2
O/W2
Y1/W2
G
24 VAC COMM
N/A
OUTDOOR
SENSOR
CONNECTION
C
B
S1
S2
C
Y2
C
CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL 2S
SINGLE-STAGE
FURNACE
TWO-SPEED
HEAT PUMP
See notes 7, 9, 11,14 and 24
W
R
Y1
R
O
W2
G
L
W3
Y
H
R1
FAN
HEAT STAGE 3
RVS COOLING
24 VAC HOT
K
A98587
24 VAC HOT
24 VAC COMM
HEAT STAGE 3
R
C
G
W/W1
Y/Y2
R
C
RVS COOLING
Y1
B
S1
S2
C
O
CARRIER
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
SINGLE-STAGE
FURNACE
TWO-SPEED
HEAT PUMP
See notes 7, 10, 11, 14 and 24
G
O/W2
W
R
Y
Y2
W3
L
Y1
H
R1
COOL/HEAT
STAGE 2
FAN
COOL/HEAT
STAGE 1
N/A
OUTDOOR
SENSOR
CONNECTION
8