Fig. 17—Two-Stage Furnace With
1-Speed Heat Pump (Dual Fuel)
A97397
O/W2
W/ W1
Y1/W2
G
R
THERMIDISTAT
2-STAGE
FURNACE
1-SPEED
HEAT PUMP
W/W1
G
Y/Y2
C
Y
W2
O
R
C
DHUM
HUM
B
S1
S2
W2
R
C
HEAT STAGE 2
(FURNACE LO)
HEAT STAGE 3
(FURNACE HI)
HEAT/COOL
STAGE 1
(COMPRESSOR)
RVS COOLING
FAN
24 VAC HOT
24 VAC COMM
N/A
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 3, 7, 9, 10, 14, 15, and 17
Fig. 15—Two-Stage Furnace With
1-Speed Air Conditioner
A97395
O/ W2
W/W1
Y1/W2
G
R
THERMIDISTAT
2-STAGE
FURNACE
1-SPEED
AIR CONDITIONER
W/W1
G
Y/Y2
C
Y
C
DHUM
HUM
B
S1
S2
W2
R
C
HEAT STAGE 1
COOL STAGE 1
HEAT STAGE 2
N/A
FAN
24 VAC HOT
24 VAC COMM
N/A
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 6, 13, and 15
Fig. 18—Two-Stage Furnace With
2-Speed Heat Pump (Dual Fuel)
A97398
O/W2
W/W1
Y1/W2
G
R
THERMIDISTAT
2-STAGE
FURNACE
2-SPEED
HEAT PUMP
W/W1
G
Y/Y2
C
Y2
W3
W2
Y1
O
R
C
DHUM
HUM
B
S1
S2
W2
R
C
HEAT STAGE 3
(FURNACE)
HEAT/COOL
STAGE 1
(COMPRESSOR LO)
HEAT/COOL
STAGE 2
(COMPRESSOR HI)
RVS COOLING
FAN
24 VAC HOT
24 VAC COMM
N/A
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
OUTDOOR
SENSOR
See notes 3, 4, 5, 8, 9, 10, 14, 16, and 17
Fig. 16—Two-Stage Furnace With
2-Speed Air Conditioner
A97396
O/W2
W/ W1
Y1/W2
G
R
THERMIDISTAT
2-STAGE
FURNACE
2-SPEED
AIR CONDITIONER
W/W1
G
Y/Y2
C
Y2
R
Y1
C
DHUM
HUM
B
S1
S2
W2
R
C
HEAT STAGE 1
COOL STAGE 1
COOL STAGE 2
HEAT STAGE 2
FAN
24 VAC HOT
24 VAC COMM
N/A
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/ Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 6, 13, and 16
—14—