Honeywell Home T140 Digital Thermostat
Installation and User Guide
1 Installation
Must be installed by a competent person. To ensure your safety, make sure the mains power is switched OFF ? before accessing wiring.
1.1 Guidelines
Diagram showing installation steps: a person mounting the thermostat on a wall at a recommended height of 1.2-1.5m. Includes icons for safety checks.
1.2 Thermostat Wiring
For a 2-wire connection: no polarity. Direct wiring to the circulator.
Diagram showing a 2-wire connection to a circulator pump and connection to furnace terminals (T1 Relay).
For a 3-wire connection: observe the polarity. Wiring to a power-operated mixing control valve.
Diagram showing a 3-wire connection to a mixing control valve.
1.3 Remote Input Wiring
The thermostat is equipped with a remote input which allows connection of a telephone controller or a home automation system. When a signal is received through this input, the thermostat will automatically switch from normal operating mode to Vacation mode. For details on operating the telephone controller, refer to the instruction manual.
Diagram showing connection to a telephone controller or home automation system, with a 12 VDC input.
1.4 Configure the Thermostat
The switches are located on the back of the faceplate. Default settings are highlighted.
| Switch | Description | UP | DOWN |
| 1 & 2 | Cycles (proportional) | 15 min (see 1.4.1) | |
| 3 | Span (conventional) | 0.5°C (0.9°F) (see 1.4.2) | |
| 4 | Clock display | 12H | 24H |
| 5 | Temperature display ¹ | °F | °C |
| 6 | Temperature control mode | Proportional (see 1.4.1) | Conventional (see 1.4.2) |
| Pump protection ² | Deactivate | Activate |
¹ If you change from °C to °F (or vice versa), you will need to reprogram your Comfort, Economy and Vacation settings.
² For hot water installations, it is recommended to enable this option to activate the pump for one minute every 24 hours to prevent pump seizure.
| Cycles | EUROPE | Position |
| 5 minutes | Not recommended for furnaces | |
| 10 minutes | Gas or electric wall furnace | |
| 15 minutes | Fuel or gas floor furnace, forced air heating | |
| 20 minutes | Commercial unit |
1.4.1 Proportional Adaptive Mode (switch #5)
This mode analyzes previous cycles to define the next duty cycle. This control mode guarantees optimal temperature control based on the system's capacity. To extend the life of the system, a minimum On/Off time of 10% of the cycle has been implemented.
Ideal for: Radiant or convection electrical heating system; Circulator control in a hot water system; Electrical hot-air furnace; Conventional gas or fuel hot-air furnace.
1.4.2 Conventional mode with anticipation (switch #5)
This mode is compatible with all heating systems.
Programmable Span Selection (switches #1 and #2)
Select the span using switches #1 and #2. The default temperature span is 0.5°C. For example, if the temperature setpoint is 20°C, the heating system will turn on at 19.5°C and turn off at 20.5°C.
| Span | Hot Water Heating | Forced Air Heating | Position |
| 0.3°C | Not recommended for furnaces | Not recommended for central units | |
| 0.4°C | Gas or electric wall furnace | Radiant or convection electric heating | |
| 0.5°C | Fuel or gas floor furnace, forced air heating | Central heating | |
| 0.6°C | Commercial unit |
Heating Cycle Selection (switches #1 and #2)
Select the cycle using switches #1 and #2. Short cycles help eliminate temperature variations, thus increasing user comfort.
1.5 Install the Batteries
When you first install the batteries, the unit runs a sequence of tests and a complete reset to zero. The screen should display 0:00 MO and the ambient temperature. The current setpoint is 20°C.
1.5.1 Replacing the batteries
The thermostat will display an icon ? indicating that the batteries must be replaced. This icon will be displayed for 60 days; after this delay, the thermostat will shut down the heating unit. The time and programming are saved for 15 seconds when replacing the batteries.
2 Basic Configuration
2.1 Set the Time and Day
- Set the time, using the Hour and Minute buttons ⏰.
- Set the day, using the Day button ?.
2.2 Configure the Setpoints
2.2.1 Comfort and Economy
These setpoints are associated to the schedule's programs and are pre-programmed as follows:
- Comfort: 20°C (68°F) - Programs 1 and 3
- Economy: 18°C (64°F) - Programs 2 and 4
2.2.2 Vacation
This pre-programmed setpoint is used when the Vacation mode is activated.
- Vacation: 10°C (50°F)
2.2.3 To Modify a Setpoint
- Set the temperature using ▲▼.
- Press and hold one of the setpoint buttons (R or or ) until the icon is displayed on the screen (approx. 3 seconds).
2.3 View the Current Setpoint
To view the current setpoint, quickly press once one of the arrow buttons ▲▼. The screen displays the setpoint; the arrow indicates a setpoint.
3 Select the Operating Mode
3.1 Automatic
This mode executes the schedule. To activate: Press Manual/Auto until ⚙️ is displayed. The program setpoint icon is displayed.
3.1.1 Temporary Bypass
When in Automatic mode, you can temporarily bypass the current program setpoint until the beginning of the next program. To bypass:
- Set the desired temperature ▲▼ OR quickly press R or to use a pre-defined setpoint.
3.2 Manual ?️
This mode allows you to maintain a constant temperature.
- Press Manual/Auto until ?️ is displayed.
- Set temperature ▲▼ OR quickly press R or to use a pre-defined setpoint.
3.3 Vacation ?️
Maintains a specific temperature when away for a prolonged absence (e.g. vacation). From the thermostat, quickly press to activate.
4 Program Your Schedule
The thermostat allows four setting changes for each day of the week. There are no pre-set programs. Your heating system switches between the Comfort setpoint and the Economy setpoint according to the times you would have set.
| Programs | Associated Setpoint | Time |
| PROG 1 | (Comfort) | Wake-up |
| PROG 2 | (Economy) | Leave |
| PROG 3 | (Comfort) | Return |
| PROG 4 | (Economy) | Sleep |
4.1 Set or Modify the Programs
- Press Program. The screen displays MO and PROG 1.
- Press Day ? to select the day (hold for 3 seconds to select all days of the week).
- Press Hour and Minute ⏰ to set the start time. To clear an entry, press Clear, the time zone displays --:-- when the program is inactive.
- Press Program to select the program number (2, 3 or 4).
- Repeat steps 3 and 4 for remaining programs.
- Press Manual/Auto to exit.
To erase program for desired day:
- Press Program until desired program is selected.
- Press Day to select desired day.
- Press Clear to erase the time (--:--).
- Press Manual/Auto to exit.
5 Technical Specifications
| Power supply | 2 AA or LR6 alkaline batteries 1.5 V |
| Max. resistive load | 5 A @ 240 VAC / 5 A @ 30 VDC |
| Max. inductive load | 2 A @ 240 VAC / 2 A @ 30 VDC (P.F. = 0.4) |
| Remote input | 12 VDC, ± 10%, 2.5 mA |
| Certifications | CE, c UL us |
| Control device | Electronic |
| Automatic action | Type 1 B |
| Number of programs | 4 programs / day, total of 28 programs |
| Storage temperature | -20°C to 50°C (-4°F to 122°F) |
| Operating temperature | 0°C to 50°C (32°F to 122°F), 95% R.H. |
| Temperature setting range | 5°C to 30°C (40°F to 85°F) |
| Temperature display resolution | 0.1 degree |
| Temperature reading accuracy | ± 0.5°C (± 0.9°F) |
| Software | Class A |
| Protection class | II |
| Protection degree | IP 40 |
| Wire terminal capacity | Designed to handle a cross-section of wire measuring up to 2.5 mm² (14 AWG). |
Manufacturer Information
Bk-electronic GmbH
Hardhofweg 40
74821 Mosbach
Germany
For assistance with this product please visit livewell.honeywellhome.com
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