HONEYWELL HOME DT4 Room Thermostat
APPLICATION
The DT4 room thermostats provide control of heating systems for homes and apartments and bring together the slim, modern design with simple functionality, a large and clear LED segment display with an easy-to-use wake up button. The range has features that are easy to love, it offers everything you and your customers want and need.
The DT4 is compatible with both hybrid and greener energy systems and energy-efficient solutions including heat pumps, zoning and underfloor heating and cooling devices and also works with zone valve applications (note, not with electric heating /240 V).
The range:
- DT4, DT4R and DT4M are compatible with 24-230 V
- On/Off appliances such as gas boilers, combi-boilers, and heat pumps
- DT4 and DT4M are for wired on the wall installations and the DT4R for wireless installations
- DT4R is a thermostat and receiver box that is also designed to be backwards compatible with existing
- Honeywell Home RF products. The DT4R is designed with the installers in mind and includes a received module with mounting options for directly on the wall or on the wall box
- DT4M and DT4R versions support OpenTherm® appliances, with versions available for both standard OpenTherm® and OpenTherm® Smart Power
SPECIAL FEATURES
- Slim and modern design and three colourways blends into any décor
- Table stand or wall mounted thermostat options to fit new and replacement installations
- Modern and clear LED display with adjustable brightness for easier viewing in all light conditions
- Clear coloured icon indicating product state
- Adjustable parameter functions to allow optimum control of connected appliance
- ‘Off’ position has an integral frost protection setting at minimum 5 °C to prevent pipes freezing
- Eco Offset – allowing a timed offset temperature for Eco mode during heating and cooling
- Backwards compatibility with existing Honeywell Home wireless products
- Receiver box with clear LED indication and override button
Specification
- On/Off or OpenTherm® (DT4R/DT4M) compatible control
- A flip up wiring platform for easy wiring
- User menu allows extra functions to be set at the discretion of the user:
- Heating, Cooling or Heating and Cooling
- On/Off
- Eco Offset duration
- Installer menu allows extra functions to be set at the discretion of the installer to match the homeowner’s applications and needs
- LED display brightness
- Cycle rate
- Heating and cooling changeover
- Upper/Lower set point limit adjustment
- Minimum ON time
- Minimum OFF time
- Temperature Eco Offset
- Factory reset
- Binding (DT4R only)
TECHNICAL DATA
DT4/DT4M/DT4R Room Thermostat
| Operating temperatures | |
| Room temperature
display range: |
0 °C to 40 °C |
| Temperature setting | |
| range: | |
| Program: | 5 °C to 35 °C |
| OFF (Heating Mode): | 5 °C |
| Specifications | |
| Control form: | Fuzzy Logic |
| Heating system mode: | Heating and Cooling |
| Switching capacity: | 3A (Resistive), 1A (Inductive) |
| Switching type: | SPDT |
| Sensing element: | 10k (@25 °C) NTC thermistor |
| Power: | Powered by 2 X AA Batteries (Alkaline)
OpenTherm® Smart Power batteries not required |
| Wiring: | DT4 (wired) & DT4M (OpenTherm®)
terminal block capable of accepting wired up to 2.5 mm2 |
RF communication
| Specifications | |
| RF operation band: | ISM 868.0-868.6 MHz |
| Maximum power: | 25 mW |
| Protocol: | Encrypted |
| Communication range: | 30 m in residential building
environment |
| Receiver class:
R.E.D. |
RX Cat 2 |
Receiver box
| Specifications | |
| Power: | 230 V AC mains supply |
| Electrical rating: | 5A (Resistive), 3A (Inductive) |
| Cycle rate: | Selectable by application |
| Wiring: | Terminal block capable of
accepting wired up to 2.5 mm2 |
| Wire access: | From bottom with cable clamps. Left Terminals – Mains wiring
Right Terminals – Relay Terminals |
| IP class: | IP30 |
Environmental and standards
| Specifications | |
| EMC: | 2014/30/EU |
| LVD: | 2014/35/EU |
| R&TTE: | 1995/5/EC |
| Wire access: | From back via large wall box
opening. |
| ErP: | |
| DT40, YT42 | Class IV (+2 %) |
| DTS42, DT41SPM, | Class V (+3 %) |
| YT43M, DT41M | |
METHOD OF OPERATION
OpenTherm®
By connecting the DT4M to an OpenTherm® appliance, additional OpenTherm® Parameters within the DT4R/DT4M.
Heat Range
The normal lower temperature limit of 5 °C can be increased up to 21 °C to protect from cold. Useful if the users include the elderly, children or disabled. The normal upper-temperature limit of 37 °C can be reduced down to 21 °C to save the users energy.
Cooling Range
The normal lower temperature limit of 15 °C can be increased up to 27 °C, useful if the users include the elderly, children or disabled. The normal upper temperature limit of 40 °C can be reduced down to 27 °C to save the users energy.
Application Coverage
DT4 room thermostat is designed to work with OpenTherm® wired and wireless, boilers, heat pumps and zoning applications such as evohome/HCC100. DT4R also communicates to existing Honeywell Home wireless devices such as ST9000 (UK Timers) and BDR91A (Boiler Relay) allowing easy upgrades to existing systems
Eco Offset
The DT4 has an Eco Offset function that can be used to boost the system for a period of time. Eco Offset state operates in 0.5 °C varying from -3 °C to + 3 °C.
- -3 °C in Heating mode will reduce the temperature by 3 °C
- -3 °C in Cooling mode will increase the temperature by 3 °C
- +3 °C in Heating mode will increase the temperature by 3 °C
- +3 °C in Cooling mode will reduce the temperature by 3 °C
Providing both a boost function when operating in + °C and providing an economy temperature reduction in – °C. The period of time for the Eco Offset is set by the user in the user menu of the product, this can be set from 1-24 hours, with 0 cancelling the Eco setting.
Failsafe
When the temperature sensor fails (DT4, DT4M) or the radio communication between the thermostat and the receiver box is lost the device will cycle the demand 20 % On/80 % Off.
TRANSPORTATION AND STORAGE
Keep parts in their original packaging and unpack them shortly before use. The following parameters apply during transportation and storage
| Parameter | Value |
| Min. ambient temperature: | 0 °C |
| Max. ambient temperature: | 40 °C |
| Shipping and storage
temperature: |
-20 °C to 55 °C |
| Parameter | Value |
| Min. ambient relative
humidity: |
10 % * |
| Max. ambient relative
humidity: |
90 % * |
TECHNICAL CHARACTERISTICS
Thermostat display/Button layout
Reference to the icons:
Heat Demand: Room temperature is below set-point – indicating there is a demand for heating (boiler activity might occur).
Cooling Demand: Room temperature is above set-point – indicating there is a demand for chiller or cooling appliance demand.
Wireless Signal: Thermostat (DT4R only) is connected to the Receiver Box.
Eco: Temporary adjustment of set point.
Off: Indicating the thermostat is currently off.
Warning: Alerting you there is an issue with communication or battery level.
Low Battery: Power has reached approximately 10 % – flashes when critically low (see changing the batteries).
Receiver box interface
- Status LED
- Communication with thermostat
- Binding mode
- Manual override
- Reset
- Delete binding
- Delete binding
Dimensions
ORDERING INFORMATION
| Series | Colour | Wired | Wireless | On/Off | OpenTherm® | OpenTherm®
Smart Power |
EAN Code | Item No. |
| DT4 | white | • | • | 5059085002619 | DT40WT20 | |||
| grey | • | • | 5059085002626 | DT40GT21 | ||||
| black | • | • | 5059085002633 | DT40BT22 | ||||
| DT4 | white | • | • | 5059085002732 | DT41MWT30 | |||
| grey | • | • | 5059085002749 | DT41MGT31 | ||||
| black | • | • | 5059085002756 | DT41MBT32 | ||||
| DT4M | white | • | • | 5059085002763 | DT41SPMWT30 | |||
| grey | • | • | 5059085002770 | DT41SPMGT31 | ||||
| black | • | • | 5059085002787 | DT41SPMBT32 | ||||
| DT4R | white | • | 5059085002671 | DTS42WRFST20 | ||||
| grey | • | 5059085002688 | DTS42GRFST21 | |||||
| black | • | 5059085002695 | DTS42BRFST22 | |||||
| DT4R | white | • | • | 5059085002640 | YT42WRFT20 | |||
| grey | • | • | 5059085002657 | YT42GRFT21 | ||||
| black | • | • | 5059085002664 | YT42BRFT22 | ||||
| DT4R | white | • | • | 5059085002701 | YT43MRFWT30 | |||
| grey | • | • | 5059085002718 | YT43MRFGT31 | ||||
| black | • | • | 5059085002725 | YT43MRFBT32 |
REFERENCE:
DOWNLOAD MANUALS:
HONEYWELL HOME DT4 Room Thermostat Product Data Sheet
OTHER MANUALS:
HONEYWELL HOME DT4 Room Thermostat User Guide
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