Wiring Diagrams

Use 18- to 22- gauge thermostat wire. Shielded cable is not required.
Set the R Slider Tab on the UWP to the up position (1 wire) for 1 transformer systems or the down position (2 wires) for 2 transformer systems. See Setting Slider Tabs.
Set the U Slider Tab as shown in the diagrams.
When T10+ is used with THM04R3000 EIM, wire only R and C to T10+ to power the thermostat. Then follow the wiring diagrams included in EIM literature.

Wiring at T10 or T10+ without EIM

Heat only: Gas, oil, or Electric furnace

G used for independent fan control only. Most Heat Only, Gas or Oil Forced Air Systems do not use a fan (G) wire.

Cool only

1H/1C gas or electric furnace

2H/1C gas or electric furnace

2-transformer system; 1H/1C oil furnace

2-transformer system; hot water heat with air-conditioning (or hot water coil)

Hot water heat with power open zone valve

Hot water boiler, heat only

Series 20 valve (power open and power closed)

Thermostat must be configured for radiant heat with 0 (zero) cool stages.

2H/2C Gas Furnace

Wiring a third Cool stage without EIM

G, W, W2, etc. are wired as normal.

1H/1C Heat Pump without Aux Heat

	L only connected if heat pump has a fault terminal.
	Some heat pumps use B rather than O for reversing valve.
	IMPORTANT: DO NOT connect any wire to W for heat pump applications! This can cause heat to run continuously.

2H/1C Heat Pump with Electric Aux Heat

	COMMON REQUIRED.
	L ONLY CONNECTED IF HEAT PUMP HAS A FAULT TERMINAL.
	SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVE.
	DIFFERENT HEAT PUMP MODELS LABEL THE AUXILIARY HEAT TERMINAL DIFFERENTLY THAN SHOWN. CONSULT HEAT PUMP WIRING GUIDE.
	LOCKOUT OF AUX HEAT ON HIGH OUTDOOR TEMPERATURE CAN BE DONE THROUGH ROUTER/INTERNET CONNECTION AND APP, WIRED OUTDOOR SENSOR OR WIRELESS OUTDOOR SENSOR.
	MOST HEAT PUMPS SHARE THE SAME SET OF HEAT STRIPS FOR AUX AND EM HEAT. IN THOSE CASES E ISN’T USED. IF SEPARATE AUX AND E WIRES ARE USED, WIRE ONE SET OF STRIPS TO E TO BE ENERGIZED IN EM HEAT AND A DIFFERENT SET OF STRIPS TO AUX TO BE ENERGIZED IN AUX HEAT.
	IMPORTANT:DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS! THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY..

2H/2C Heat pump without Aux Heat

	Common required
	L only connected if heat pump has a fault terminal.
	Some heat pumps use B rather than O for reversing valve.
	IMPORTANT: DO NOT connect any wire to W for heat pump applications! This can cause heat to run continuously.

3H/2C Heat pump with electric Aux Heat

	COMMON REQUIRED.
	L ONLY CONNECTED IF HEAT PUMP HAS A FAULT TERMINAL.
	SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVE.
	DIFFERENT HEAT PUMP MODELS LABEL THE AUXILIARY HEAT TERMINAL DIFFERENTLY THAN SHOWN. CONSULT HEAT PUMP WIRING GUIDE.
	LOCKOUT OF AUX HEAT ON HIGH OUTDOOR TEMPERATURE CAN BE DONE THROUGH ROUTER/INTERNET CONNECTION AND APP, WIRED OUTDOOR SENSOR OR WIRELESS OUTDOOR SENSOR.
	IMPORTANT:DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS! THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY..
	MOST HEAT PUMPS SHARE THE SAME SET OF HEAT STRIPS FOR AUX AND EM HEAT. IN THOSE CASES E ISN’T USED. IF SEPARATE AUX AND E WIRES ARE USED, WIRE ONE SET OF STRIPS TO E TO BE ENERGIZED IN EM HEAT AND A DIFFERENT SET OF STRIPS TO AUX TO BE ENERGIZED IN AUX HEAT.

Dual fuel 2H/1C Heat pump

	Common required
	L only connected if heat pump has a fault terminal.
	Some heat pumps use B rather than O for reversing valve.
	THE HEAT PUMP AND FURNACE HAVE SEPARATE BOARDS. THEY ARE SHOWN TOGETHER HERE TO SIMPLIFY THIS DIAGRAM. w IS FROM THE FURNACE BOARD.
	BALANCE POINT LOCKOUT CAN BE DONE THROUGH ROUTER/ INTERNET CONNECTION AND APP, WIRED OUTDOOR SENSOR OR WIRELESS OUTDOOR SENSOR.
	IMPORTANT: DO NOT connect any wire to W for heat pump applications! This can cause heat to run continuously.

Dual Fuel, 3H/2C Heat Pump

	COMMON REQUIRED.
	L ONLY CONNECTED IF HEAT PUMP HAS A FAULT TERMINAL.
	SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVE.
	THE HEAT PUMP AND FURNACE HAVE SEPARATE BOARDS. THEY ARE SHOWN TOGETHER HERE TO SIMPLIFY THIS DIAGRAM. w IS FROM THE FURNACE BOARD.
	OPTIONAL: C7089U1006 WIRES TO THE TWO S TERMINALS.
	IMPORTANT:DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS! THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY..

Typical wiring of 4-pipe fan coil

	THE R/RC AND U SLIDER SWITCHES SHOULD BE SET TO THE UP POSITION AS SHOWN.
	S TERMINALS CAN BE USED FOR A WIRED INDOOR SENSOR OR OUTDOOR SENSOR. SEE THE REMOTE SETBACK WIRING OPTIONS IF A SENSOR/SWITCH WAS WIRED TO S TERMINALS ON PREVIOUS THERMOSTAT.

Typical wiring of 2-pipe fan coil with reheat using wired 10K/20K Heat/cool changeover pipe sensor

	THE R/RC AND U SLIDER SWITCHES SHOULD BE SET TO THE UP POSITION AS SHOWN.
	S TERMINALS CAN BE USED FOR A WIRED 10K OR 20K PIPE SENSOR FOR HEAT/COOL CHANGEOVER.

Typical wiring of 2-pipe fan coil without reheat using wired 10K/20K Heat/Cool changeover pipe sensor

	THE R/RC AND U SLIDER SWITCHES SHOULD BE SET TO THE UP POSITION AS SHOWN.
	S TERMINALS CAN BE USED FOR A WIRED 10K OR 20K PIPE SENSOR FOR HEAT/COOL CHANGEOVER. SEE THE REMOTE SETBACK WIRING OPTIONS IF A SENSOR/SWITCH WAS WIRED TO S TERMINALS ON PREVIOUS THERMOSTAT.

Typical wiring of 2-pipe fan coil with reheat using dry contact switch for Heat/Cool changeover

	THE R/RC AND U SLIDER SWITCHES SHOULD BE SET TO THE UP POSITION AS SHOWN.
	WIRE THE DRY CONTACT CHANGEOVER SWITCH TO R AT THE FAN COIL UNIT AND L AT T10+ AS SHOWN. T10+ CAN BE CONFIGURED FOR THE CHANGEOVER SWITCH TO BE NORMALLY OPEN IN COOL OR HEAT MODE.

Typical wiring of 2-pipe fan coil without reheat using dry contact switch for Heat/Cool changeover

	THE R/RC AND U SLIDER SWITCHES SHOULD BE SET TO THE UP POSITION AS SHOWN.
	WIRE THE DRY CONTACT CHANGEOVER SWITCH TO R AT THE FAN COIL UNIT AND L AT T10+ AS SHOWN. T10+ CAN BE CONFIGURED FOR THE CHANGEOVER SWITCH TO BE NORMALLY OPEN IN COOL OR HEAT MODE.

Wired to humidifier, dehumidifier, or ventilator with built-in transformer

Wired to fresh air damper powered by furnace transformer

Wired to humidifier, ventilator, or damper powered by external transformer

Wired to low speed fan terminal on HVAC for dehumidification