Bryant TSTATBBP250-LA instruction manual Thermostat Wiring Terminations, Ð3Ð

			LEGEND
W2	Ð	Second-Stage Heat	W1/O/B	Ð First-Stage Heat or Reversing Valve
Y2	Ð	Second-Stage Compressor	Y1	Ð	First-Stage Compressor
RS2	Ð Second Remote Sensor (Not Used)		G	Ð Fan
RS+5	Ð +5 vdc for 2 Sensors		W3/ECO	Ð Third-Stage Heat or Economizer (Not Used)
RS1	Ð	Remote Sensor	CK1	Ð	Dry Contact
RS GND	Ð Ground for 2 Sensors		CK2	Ð	Dry Contact Ground
			R	Ð 24 vac Transformer
			C	Ð 24 vac Transformer Common

Fig. 2 Ð Thermostat Wiring

THERMOSTAT		TYPICAL
B		UNIT
O
W2 Y2 R W1 Y1 G	C
		L
		E
	24 VAC COMMON	C
	FAN RELAY	G
	COMPRESSOR RELAY
		Y1
	1st STAGE HEAT CIRCUIT	O
		W1
	24 VAC RETURN	R
	2nd STAGE HEAT CIRCUIT	Y2
		W2
Fig. 3 Ð Typical Wiring (Single-Stage Cooling Units)
THERMOSTAT		TYPICAL
B		UNIT
O
W2 Y2 R W1 Y1 G	C

L

E

24 VAC COMMON

C

FAN RELAY

G

COMPRESSOR RELAY

Y1

Table 1 Ð Thermostat Wiring Terminations

EXISTING		TERMINAL
WIRE	FUNCTION
		CONNECTION
DESIGNATION
G or F	Fan	G
Y1, Y, or C	Cooling	Y1
W1, W, or H	Heating	W1/O/B
Rh, R, M, Vr, or A	Power (24 v)	R
C	Common	C*
O/B	Reversing Valve	W1/O/B²
Y2	Second Stage Cooling	Y2*
W2	Second Stage Heating	W2*
RS+5	Remote Sensor (5 vdc)	RS+5
RS	Remote Sensor Signal	RS1
RS G	Remote Sensor Ground	RS GND
CK1	Dry Contact Switch	CK1
CK2	Dry Contact Ground	CK2

*Terminals C, Y2, and W2 may not be used in all applications. ²Used on Heat Pump applications only.

1st STAGE HEAT CIRCUIT

O

W1

24 VAC RETURN

R

2nd STAGE COMPRESSOR RELAY

2nd STAGE HEAT CIRCUIT

Y2

W2

Fig. 4 Ð Typical Wiring (Two-Stage Cooling Units)

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