Bryant TSTATBBP250-LA Installation, Start-Up And Service Instructions Manual page 3

W2 — Second-Stage Heat
Y2 — Second-Stage Compressor
RS2 — Second Remote Sensor (Not Used)
RS+5 — +5 vdc for 2 Sensors
RS1 — Remote Sensor
RS GND — Ground for 2 Sensors
THERMOSTAT
B
O
W2 Y2 R W1 Y1 G C
1st STAGE HEAT CIRCUIT
2nd STAGE HEAT CIRCUIT
Fig. 3 — Typical Wiring (Single-Stage Cooling Units)
THERMOSTAT
B
O
W2 Y2 R W1 Y1 G C
1st STAGE HEAT CIRCUIT
2nd STAGE COMPRESSOR RELAY
2nd STAGE HEAT CIRCUIT
Fig. 4 — Typical Wiring (Two-Stage Cooling Units)
LEGEND
Fig. 2 — Thermostat Wiring
TYPICAL
UNIT
L
E
24 VAC COMMON
C
FAN RELAY
G
COMPRESSOR RELAY
Y1
O
W1
24 VAC RETURN
R
Y2
W2
TYPICAL
UNIT
L
E
24 VAC COMMON
C
FAN RELAY
G
COMPRESSOR RELAY
Y1
O
W1
24 VAC RETURN
R
Y2
W2
W1/O/B — First-Stage Heat or Reversing Valve
Y1 — First-Stage Compressor
G — Fan
W3/ECO — Third-Stage Heat or Economizer (Not Used)
CK1 — Dry Contact
CK2 — Dry Contact Ground
R — 24 vac Transformer
C — 24 vac Transformer Common
Table 1 — Thermostat Wiring Terminations
EXISTING
WIRE
DESIGNATION
G or F
Y1, Y, or C
W1, W, or H
Rh, R, M, Vr, or A
C
O/B
Y2
W2
RS+5
RS
RS G
CK1
CK2
*Terminals C, Y2, and W2 may not be used in all applications.
†Used on Heat Pump applications only.
—3—
TERMINAL
FUNCTION
CONNECTION
Fan
Cooling
Heating W1/O/B
Power (24 v)
Common
Reversing Valve W1/O/B†
Second Stage Cooling
Second Stage Heating
Remote Sensor (5 vdc) RS+5
Remote Sensor Signal
Remote Sensor Ground RS GND
Dry Contact Switch
Dry Contact Ground
G
Y1
R
C*
Y2*
W2*
RS1
CK1
CK2