A94273
Fig. 4—Single-Speed Air Conditioner with
2-Stage or Variable-Speed Furnace
(Thermostat Controlled Staging)
24 VAC HOT
FAN
HEAT STAGE 1
COOL STAGE 1
HEAT STAGE 2
N/A
R
G
W/W1
Y/Y2
O/W2
Y1/W2
R
G
24 VAC COMM.
N/A
N/A
OUTDOOR
SENSOR
CONNECTION
C
B
L
S1
S2
C
Y
C
MODEL HP
THERMOSTAT
TWO-STAGE OR
VARIABLE-SPEED
FURNACE
SINGLE-SPEED
AIR CONDITIONER
See note 2
W/W1
Y/Y2
W2
A94219
Fig. 5—Single-Speed Air Conditioner with Typical
Fan Coil (Single-Stage Heat Control)
24 VAC HOT
FAN
HEAT STAGE 1
COOL STAGE 1
N/A
N/A
R
G
W/W1
Y/Y2
O/W2
Y1/W2
R
G
24 VAC COMM.
N/A
N/A
OUTDOOR
SENSOR
CONNECTION
C
B
L
S1
S2
C
Y
C
MODEL AC
THERMOSTAT
TYPICAL
FAN COIL
SINGLE-SPEED
AIR CONDITIONER
See notes 3 and 7
W2
Y/Y2
W3
*
Y1 *
*
*
O
L
E
Fig. 6—Single-Speed Air Conditioner with Typical
Fan Coil (Dual-Stage Heat Control)
A94274
24 VAC HOT
FAN
HEAT STAGE 1
COOL STAGE 1
HEAT STAGE 2
N/A
R
G
W/W1
Y/Y2
O/W2
Y1/W2
R
G
24 VAC COMM.
N/A
N/A
OUTDOOR
SENSOR
CONNECTION
C
B
L
S1
S2
C
Y
C
MODEL HP
THERMOSTAT
TYPICAL
FAN COIL
SINGLE-SPEED
AIR CONDITIONER
See notes 2 and 7
W2
Y/Y2
W3
*
Y1 *
O
L
E
*
*
Fig. 7—Single-Speed Heat Pump with Typical
Fan Coil
A94220
24 VAC HOT
FAN
HEAT STAGE 2
COOL /HEAT
STAGE 1
RVS COOLING
N/A
R
G
W/W1
Y/Y2
O/W2
Y1/W2
R
G
24 VAC COMM.
RVS HEATING
TROUBLE
OUTDOOR
SENSOR
CONNECTION
C
B
L
S1
S2
C
Y
C
MODEL HP
THERMOSTAT
TYPICAL
FAN COIL
SINGLE-SPEED
HEAT PUMP
See note 7
W2
Y/Y2
O
*
W3
E
L *
*
Y1 *
R
W2
O
4
