RED jumper wire (provided with thermostat) must be connected between thermostat's RH and RC terminals for proper thermostat operation with this system.
RC
RH
Heating System
THERMOSTAT
6
MV
SYSTEM
B
Y
O
G
B
24 VAC
G
Cooling System
Fan Relay
W
RC
RH
JUMPER WIRE 6
THERMOSTAT
MV
SYSTEM
Y
G
Cooling System
B
Y
O
JUMPER WIRE
G
W
RC
THERMOSTAT
RH
SYSTEM
Changeover Compressor Fan Relay* Contactor Relay
Hot
Hot
* Changeover relay is energized when the system switch is in the COOL position
120 VAC
W
RC
JUMPER WIRE 6
RH
B
Y
G
W
Cooling System
Fan Relay
Heating System
O
NOTE
SYSTEM
24 VAC
RED jumper wire (provided with thermostat) must be connected between thermostat's RH and RC terminals for proper thermostat operation with this system.
120 VAC Neutral
HEATING TRANSFORMER
Fan Relay
MV
RC
RH
Hot 24 VAC
TRANSFORMER
6
MV
B
Y
O
G
W
RC
RH
THERMOSTAT SYSTEM
COOLING TRANSFORMER
Figure 3. Typical wiring diagram for heat/cool, 5-wire, two-transformer systems
Millivolt System
NOTE Thermostat must have batteries installed.
1 Y
G
W
HM2
RC
120 VAC Neutral
120 VAC Neutral
6
SYSTEM
Figure 8. Typical wiring diagram for heat/cool, 4-wire, single transformer systems
Hot 24 VAC
HM1
THERMOSTAT
THERMOSTAT Hot
Heating System
120 VAC
Neutral TRANSFORMER
Figure 7. Typical wiring diagram for heat pump with cool active reversing valve
Figure 2. Typical wiring diagram for cool only, 3-wire, single transformer systems
O
120 VAC
Neutral TRANSFORMER
Figure 6. Typical wiring diagram for heat pump with heat active reversing valve
TRANSFORMER
B
Hot
* Changeover relay is energized when the system switch is in the HEAT position
120 VAC
Neutral
MV
SYSTEM
24 VAC
24 VAC
6
THERMOSTAT
RH
24 VAC
Neutral
Y
O
RC
Hot
Figure 1. Typical wiring diagram for heat only, 3-wire, single transformer systems MV
W
Changeover Compressor Fan Relay* Contactor Relay
TRANSFORMER
6
JUMPER WIRE
RH
Figure 9. Typical wiring diagram millivolt systems
HM
HM1 W RH RC G
Y
HM2 6
TECHNICAL HELP
HUMIDIFIER
NOTE: Two terminal choices (HM1 or HM2) are provided for humidifier control. When the humidity setting is higher than the room humidity: HM1 turns off the humidifier when the call for heat ends. HM2 powers the humidifier an additional 30 seconds after the call for heat ends to provide slightly more humidity output. Most installers will use HM1 unless they feel more humidity is desirable. 6
HM1
Y
G
W
HM2
➊ From humidity system Figure 4. Typical wiring diagram for 24V humidifier system
6
MV
6 Zone Valve 1
4 5
Y
G
W
RC
RH
2
NOTE Thermostat must have batteries installed.
THERMOSTAT SYSTEM
Hot 120 VAC Neutral TRANSFORMER
Figure 10. Typical wiring diagram heat only, 3-wire zone valve systems 1 RC
RH
HM
HM1 W RH RC G
Y
HM2 6
➊ From humidity system
Figure 5. Typical wiring diagram for 120V humidifier system 156