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Thermostat, ABB-free@home Installation and Operation Instructions 

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Heat Pump Setup 

 

Rc 

Cooling power, 24 V  

 

Rh 

Heating power, 24 V  

 

Common, 24 V (from Rc)  

 

Y1 

Heat pump compressor 
(stage 1)

 

Y2 

Heat pump compressor 
(Stage 2)  

 

Fan 

 

W1 

AUX heating (stage 1)  

 

W2 

AUX heating (stage 2)  

 

ACC 

For accessories*. 
Operated by the “AUX” 
symbol on the display.  

 

O/B 

Reversing valve  

 
*  Typical accessories: humidifier or dehumidifier 
 
 

5.  Using a screwdriver, disconnect the wires and remove the old wall 

plate. Wrap the wires around a pen to prevent the wires from falling 
back into the wall, or tape the wires to the wall. 

6.  Check for any paint gaps or screw holes from the old thermostat. Use 

the optional Trim Plate to hide any flaws. Snap the Mounting Base to 
the optional Trim Plate but do NOT yet attach the Mounting Base to 
the wall. 

7.  Insert wires through the wiring hole on the Mounting Base. 

Use the wire strip gauge and trim .275" insulation from the 
end of each wire for easy insertion into wire terminals. 

8.  If there were wires connected to both Rc and Rh on the old 

thermostat (2 transformer system), remove the jumper on the 
back of the ABB Thermostat. 

9.  Properly and firmly connect the wires from the information gathered in 

Steps 3 and 4. Gently tug wires to make sure they are secure. 

10.Use the two screws provided to attach the Mounting Base to the wall. 

Use wall anchors if required. Make sure the base is level by 
keeping the built-in level bubble between the lines. Snap the 
ABB Thermostat onto the base. To prevent someone from 
removing the ABB Thermostat in a public setting, use the 
anti-theft screw provided.  

 

11.Turn the power back ON by switching on the breaker or with the 

switch that controls the heating/cooling system. 

 

 

TH-1.1 Technical Data 

Operating Voltage 

24 V AC, 60 Hz  

Wires 

AWG18 to AWG22  
Stranded Wires are NOT allowed 

Wireless Transmission Protocol 

free@home, 2.400 - 2.483 GHz, 
meshed 

Ambient Operating Temperature 

32 to 104°F (0 to 40°C)  

 

 

Supported Appliances 

Gas or Oil Furnace  

Control via W1 and W2  

Air-Conditioner  

Control via Y1 and Y2  

Heat Pump (Air or Geothermal)  

Control via Y1, Y2 and O/B  

Auxiliary Heat / Emergency Heat   Control via W1 and W2  
Humidifier or Dehumidifier  

Control via ACC  

 
 

SETUP 

Detailed information about setup is available in the technical reference 
manual and the online help for the System Access Point  
(www.abb.com/us/freeathome).  
 
1.  To complete setup, you will need the ABB-free@home

®

 System 

Access Point (SysAP) and a computer (tablet, laptop, or desktop 
computer). 

2.  Remove the sticker from the device and place it on the Thermostat 

Device Installation Plan that comes with the free@home System 
Access Point. 

3.  Walls, ceilings, and electrical equipment can affect wireless 

communication, especially steel reinforcements or other large metal 
objects. Electrical devices that send high-frequency signals (such as 
computers, wireless routers, audio systems, and video systems) 
should be at least 3-feet from this device. 

4.  When first powered, the device is in discovery mode for 30 minutes. 

This time period allows the SysAP to see and connect to the device. 
During this time, the user can login to the SysAP and add the device 
to the free@home network. 

5.  After 30 minutes, the device will automatically exit discovery mode. To 

re-enter discovery mode, the user must turn the power OFF and back 
ON again. This will place the device in discovery mode for another 30 
minutes. 

6.  Once a device has been added to a network, it will no longer enter 

discovery mode at power-up. To add the device to a new network, the 
user must first force the device to forget its existing network by 
resetting it back to factory settings.  

Follow these steps to reset: 

A) Touch and hold power OFF button for at least 15-seconds, until 

thermostat starts to reboot. 

B) After rebooting, return to steps 3-4 of SETUP to connect the device to 

a new network. 

 

Codes 

Install according to national and local electrical codes. 
 

Cleaning: 

To clean, wipe with a clean damp cloth. DO NOT use any chemical 
cleaning solutions.  
 
 

FCC/IC Information 

This device complies with part 15 of the FCC Rules and Industry Canada license-exempt RSS 
standard(s). Operation is subject to the following two conditions: (1) this device  
may not cause interference, and (2) this device must accept any interference, including 
interference that may cause undesired operation of the device. Modifications not expressly 
approved by the manufacturer could void the user’s authority to operate this equipment.  
Note: This equipment has been tested and found to comply with the limits for a Class B digital 
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable 
protection against harmful interference in a residential installation. This equipment generates, 
uses and can radiate radio frequency energy and, if not installed and used according to the 
instructions, may cause harmful interference to radio communications. However, there is no 
guarantee that interference will not occur in an installation. If this equipment does cause 
harmful interference to radio or television reception, which can be tested by turning the 
equipment off and on, the user is encouraged to try to correct the interference by doing one or 
more of the following:  

■ 

Reposition or move the receiving antenna.  

■ 

Increase the distance between the equipment and the receiver.  

■ 

Connect the equipment to an outlet on a different circuit (not the circuit used by the 
receiver).  

■ 

Consult the dealer or an experienced radio/TV technician for help. 

This equipment complies with the FCC RF radiation exposure limits set forth for an 
uncontrolled environment. This equipment should be installed and operated with a minimum 
distance of 20 centimeters between the radiator and your body. 

 

UL Compliance 

Purpose of control: Operating Control 
Construction of control: Independently Mounted Control Type 1 Action 
Pollution Degree: 2 
Overvoltage Category: 1 
Software: Class A

 
 
 
 
 
 
 
 
 
 
 

 

 

   

Customer Service:

 800-816-7809 

7:00 am – 5:30 pm, CST, Monday-Friday 
[email protected] 

 

 

 

Technical Support:

 888-385-1221, Option 1 

7:00 am – 5:00 pm, CST, Monday-Friday 
[email protected] 
 
For information about the many functions of 
this device, see the system manual at 
www.abb.com/us/freeathome 

ABB  

Electrification Products 
860 Ridge Lake Boulevard 
Memphis, TN 38120 
abb.com/freeathome 

   

 

   

ABB-free@home

®

 is a trademark of ABB Inc. NEC

®

 is a registered  

trademark of the National Fire Protection Association, Quincy, 
Massachusetts.
 

© 2018 ABB Inc. 

 

 

 

 

 

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