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