Fig. 25—Variable-Speed 2-Stage Condensing
Furnace — Without DE Connection —
With 1-Speed Heat Pump (Dual Fuel)
A97420
O/W2
W/W1
Y1/W2
G
R
THERMIDISTAT
VARIABLE-SPEED
CONDENSING
FURNACE
1-SPEED
HEAT PUMP
W/W1
G
Y/Y2
C
Y
W2
R
O
C
DHUM
HUM
B
S1
S2
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
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
W2
Y/ Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 3, 7, 9, 10, 11, 14, 15, and 17
DH
HUM
Fig. 23—Variable-Speed 2-Stage Condensing
Furnace — Without DE Connection -
With 1-Speed Air Conditioner
A97418
O/W2
W/ W1
Y1/W2
G
R
THERMIDISTAT
VARIABLE-SPEED
CONDENSING
FURNACE
1-SPEED
AIR CONDITIONER
W/W1
G
Y/Y2
C
Y
C
DHUM
HUM
B
S1
S2
W2
R
C
HEAT STAGE 1
N/A
COOL STAGE 1
HEAT STAGE 2
FAN
24 VAC HOT
24 VAC COMM
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 6, 10, 11, 13, and 15
DH
HUM
Fig. 26—Variable-Speed 2-Stage Condensing
Furnace — Without DE Connection —
With 2-Speed Heat Pump (Dual Fuel)
A97421
O/W2
W/ W1
Y1/W2
G
R
THERMIDISTAT
VARIABLE-SPEED
CONDENSING
FURNACE
2-SPEED
HEAT PUMP
W/W1
G
Y/Y2
C
Y2
W3
R
Y1
W2
O
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
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/ Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 3, 4, 5, 8, 9, 10, 11, 14, 16, and 17
DH
HUM
Fig. 24—Variable-Speed 2-Stage Condensing
Furnace — Without DE Connection —
With 2-Speed Air Conditioner
A97419
O/W2
W/W1
Y1/W2
G
R
THERMIDISTAT
VARIABLE-SPEED
CONDENSING
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
DEHUMIDIFY
HUMIDIFY
N/A
OUTDOOR
SENSOR
CONNECTION
Y/Y2
HUMIDIFIER
(24 VAC)
OUTDOOR
SENSOR
See notes 6, 10, 11, 13, and 16
DH
HUM
—16—