Wiring Diagram Notes - Carrier A94134 Installation, Start-Up, And Operating Instructions Manual

MODEL 2S TWO-STAGE OR
THERMOSTAT VARIABLE-SPEED
COOL/HEAT
Y1/W2
STAGE 1
RVS COOLING O/W2
HEAT STAGE 3 W/W1
COOL/HEAT Y/Y2
STAGE 2
G
FAN
24 VAC HOT R
24 VAC COMM. C
RVS HEATING B
L
TROUBLE
S1
OUTDOOR
SENSOR
S2
CONNECTION
Fig. 12—Two-Speed Heat Pump with 2-Stage or
Variable-Speed Furnace
MODEL 2S
THERMOSTAT
24 VAC HOT R
FAN G
HEAT STAGE 3 W/W1
COOL/HEAT Y/Y2
STAGE 2
RVS COOLING O/W2
COOL/HEAT Y1/W2
STAGE 1
24 VAC COMM. C
RVS HEATING B
L
TROUBLE
OUTDOOR S1
SENSOR
S2
CONNECTION
Fig. 13—Two-Speed Heat Pump with Typical
Fan Coil
TWO-SPEED
HEAT PUMP
FURNACE
Y1
O
W/W1
W2
Y2
Y/Y2
G
W3
R R
W2
C C
L
See note 6
A94225
TYPICAL TWO-SPEED
FAN COIL HEAT PUMP
R
R
G
W2 W2
*
Y/Y2 Y2
*
O O
Y1 *
Y1
W3
W3
C C
*
L
L
E
See note 7
A94226
MODEL 2S
THERMOSTAT
24 VAC HOT R
FAN G
HEAT STAGE 2 W/W1
COOL/HEAT Y/Y2
STAGE 1
RVS COOLING O/W2
HEAT STAGE 3 Y1/W2
24 VAC COMM. C
RVS HEATING B
L
TROUBLE
OUTDOOR S1
SENSOR
S2
CONNECTION
Fig. 14—Single-Speed Heat Pump with FK4B
Fan Coil and Special 3-Stage Electric Heat

WIRING DIAGRAM NOTES:

1. On AC models (1-stage cool, 1-stage heat), O/W2 is not
connected. Furnace must control second-stage heat. Refer to
furnace instructions for proper setup.
2. On HP models (1-stage cool, 2-stage heat), O/W2 can control
second-stage heat. Refer to indoor unit instructions for proper
setup.
3. On AC models (1-stage cool, 1-stage heat), O/W2 is not
connected. Thermostat can only control 1 stage of heat.
4. Refer to outdoor unit installation instructions for latent kit
requirements.
5. O/W2 can control second-stage heat. Refer to indoor unit
instructions for proper setup.
6. Furnace must control second-stage heat. Refer to furnace
instructions for proper setup.
7. Terminals marked with * are not present on all fan coils.
8. Requires: FK4B fan coil with special 1:2 size ratio heater
package.
6
FK4B SINGLE-SPEED
FAN COIL HEAT PUMP
R R
G
W2
Y/Y2 Y
O
O
W3 W2
Y1
C C
E
L
See note 8
A94275