Carrier WeatherMaker 38YDB Series - System Operation and Control Logic

24 VAC HOT
FAN
R
G
R
G
24 VAC COMM
N/A
OUTDOOR
SENSOR
CONNECTION
C
B
S1
S2
C C
R
PROGRAMMABLE
THERMOSTAT
MODEL 2S
40FK/FV4
FK4
FAN COIL
J1
JUMPER
J2 JUMPER
TWO-SPEED
HEAT PUMP
DH
Y1
Y1
W/W1
O/W2
Y1/W2
O
W1
Y/Y2
Y2
W1
Y/Y2
O
W2
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 2
HEAT STAGE 3
RVS COOLING
See notes 1, 2, and 3
A01427
R
Y/Y2
R
Y2
C
C
C
R
W1
O
Y1
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
40FK/FV4
FK4
FAN COIL
TWO-SPEED
HEAT PUMP
J1 JUMPER
J2 JUMPER
G
G
Y/Y2
DH
W/W1 W1
Y1
O/W2
Y1
W2
O
B
S1
S2
24 VAC HOT
24 VAC COMM
FAN
RVS COOLING
OUTDOOR
SENSOR
CONNECTION
HEAT STAGE 3
COOL/HEAT
STAGE 2
COOL/HEAT
STAGE 1
N/A
See notes 1, 2, 3, and 4
A01425
O/W2
W/W1
Y1/W 2
G
R
O
Y1
40FK/FV4
FK4
FAN COIL
TWO-SPEED
HEAT PUMP
W1
G
W2
C
Y2
R
W1
Y1
O
C
DHUM
HUM
B
S1
S2
Y/Y2
R
C
DH
COOL/HEAT
STAGE 1
HEAT STAGE 3
COOL/HEAT
STAGE 2
RVS COOLING
FAN
24 VAC HOT
24 VAC COMM
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
J2 JUMPER
REMOVE J1
THERMIDISTAT
CONTROL
MODEL RH
See notes 1, 2, 3, 6, 9, and 10
A01421
O/W2
W/W1
Y1 / W 2
G
R
THERMIDISTAT
CONTROL
MODEL RH
SINGLE-STAGE
FURNACE
TWO-SPEED
HEAT PUMP
W
G
Y
C
Y2
W1
R
Y1
O
C
DHUM
HUM
B
S1
S2
R
C
HEAT STAGE 3
COOL/HEAT
STAGE 2
RVS COOLING
FAN
24 VAC HOT
24 VAC COMM
N/A
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
COOL/HEAT
STAGE 1
See notes 1, 2, 3, 7, 8, 9, 10, and 11
A01422
W/W1
G
R
SINGLE-STAGE
FURNACE
TWO-SPEED
HEAT PUMP
W
G
Y
C
Y2
W1
C
L
B
S1
S2
R
R
C
HEAT STAGE 3
(FURNACE)
COOL/HEAT
STAGE 2
(COMPRESSOR HI)
FAN
24 VAC HOT
24 VAC COM
O
O/W2
RVS COOLING
RVS SENSING
N/A
OUTDOOR
SENSOR
CONNECTIONS
Y/Y2
Y1
COOL/HEAT
STAGE 1
(COMPRESSOR LO)
Y1/W2
OUTDOOR
SENSOR
PROGRAMMABLE
DUAL FUEL
THERMOSTAT
MODEL DF
See notes 1, 2, 3, 7, 8, and 13
A01423
O/W2
W/W1
Y1/W2
G
R
TWO-STAGE
FURNACE
WITH PSC
BLOWER MOTOR
TWO-SPEED
HEAT PUMP
W/W1
G
Y/Y2
C
Y2
W1
R
Y1
O
C
DHUM
HUM
B
S1
S2
W2
R
C
HEAT STAGE 3
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 2
RVS COOLING
FAN
24 VAC HOT
24 VAC COMM
N/A
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
THERMIDISTAT
CONTROL
MODEL RH
See notes 1, 2, 3, 5, 7, 8, 9, 10, and 11
A01426
Fig. 12—Typical 24V Circuit Connections
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