→ Fig. 8—Two-Speed Air Conditioner
with Single-Stage Furnace
A98457
24 VAC HOT
24 VAC COMM
HEAT STAGE 1
COOL STAGE 2
FAN
R
C
G
W/W1
Y/Y2
R
C
N/A
COOL STAGE 1
N/A
OUTDOOR
SENSOR
CONNECTION
Y1
B
S1
S2
C
MODEL 2S
THERMOSTAT
SINGLE-STAGE
FURNACE
TWO-SPEED
AIR CONDITIONER
See notes 2, 5, and 8
G
O/W2
W
R
Y
Y2
Y1
→ Fig. 6—Single-Speed Air Conditioner
with Typical Fan Coil
A98455
24 VAC HOT
24 VAC COMM
HEAT STAGE 1
COOL STAGE 1
FAN
R
C
G
W/W1
Y/Y2
R
C
HEAT STAGE 2
N/A
N/A
OUTDOOR
SENSOR
CONNECTION
Y1
B
S1
S2
C
Y
MODEL HP
THERMOSTAT
TYPICAL
FAN COIL
SINGLE-SPEED
AIR CONDITIONER
See notes 2, 4, 6, and 11
Y
G
O/W2
*
W2
E
W3
→ Fig. 9—Two-Speed Air Conditioner
with 2-Stage or Variable-Speed Furnace
A98458
24 VAC HOT
24 VAC COMM
HEAT STAGE 1
COOL STAGE 2
FAN
R
C
G
W/W1
Y/Y2
R
C
HEAT STAGE 2
COOL STAGE 1
N/A
OUTDOOR
SENSOR
CONNECTION
Y1
B
S1
S2
C
MODEL 2S
THERMOSTAT
TWO-STAGE OR
VARIABLE-SPEED
FURNACE
TWO-SPEED
AIR CONDITIONER
See notes 2, 3, 6, and 8
G
O/W2
R
Y2
W/W1
Y/Y2
W2
Y1
Y1
*
HUM
→ Fig. 7—Single-Speed Heat Pump
with Typical Fan Coil
A98456
24 VAC HOT
24 VAC COMM
R
C
G
W/W1
Y/Y2
R
C
RVS COOLING
N/A
OUTDOOR
SENSOR
CONNECTION
Y1
B
S1
S2
C
Y
MODEL HP
THERMOSTAT
TYPICAL
FAN COIL
SINGLE-SPEED
HEAT PUMP
See notes 6, 7, and 11
Y
G
O/W2
*
W2
R
W2
O
E
W3
COOL/ HEAT
STAGE 1
FAN
N/A
HEAT STAGE 2
6
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