DT92
WIRELESS DIGITAL ROOM THERMOSTAT
PRODUCT SPECIFICATION SHEET
FEATURES
•Energy saving TPI control performance
•Advanced self-learning control adapts to the environment and ensures close temperature control with minimum energy usage
•Slim modern styling
•Simple user interface with large high contrast display and easy-to-read characters
•Display shows room temperature, with option to inquire about setpoint
•5°C to 35°C setpoint range with 0.5°C increments, using ▲ and ▼buttons
•Off/standby button, allowing manual switch off, with frost protection active
•Adjustable off/standby setpoint 5°C to 16°C or DT92 can be set to off completely
•Room thermostat is battery powered by 2 x AA (LR6) alkaline cells giving up to 4 years battery life (minimum 2 years), with battery low warning
•Simple battery change by unclipping front cover
•Relay switching box is 230Vac mains powered with 24…230Vac SPDT potential-free contacts
•5 A resistive, 3 A inductive switch rating
The new DT92 family of wireless digital room thermostats is a range of market leading products designed to provide comfort with economy in modern heating systems.
Comprising a battery-powered room thermostat and a mains switching relay box, DT92 features robust 2-way RF communications between the units. This allows signal strength testing to help the installation process. The RF link between both units is already set (prebound) at the factory, so the product is ready for immediate installation.
Energy efficiency is addressed by state-of-the-art TPI control performance and an ECO button energy saving feature. Applications include control of gas or oil-fired boiler systems, underfloor heating, electric heating and zoning systems.
With a modern fresh look that complements any style of décor, and a range of valued features for users and installers alike, DT92 sets the standard for simple environmentally-friendly wireless room thermostats.
•2-way RF communications at 868MHz radio frequency band, giving typical reliable range of 30m in houses
•Transmission and signal strength test features to guarantee good room thermostat placement
•RF link between units is pre-set at the factory
•Installer Mode allows operation to be customised for the application and the needs of the user
•NVRAM storage of setup parameters, ensuring these are never lost
•Setpoint limits can be programmed in
•Special ‘fail-safe’ mode, should RF communications be temporarily lost
•Manual override possible at relay box
•Optional table stand supplied for thermostat
FEATURES UNIQUE TO DT92E ECO MODEL
•Energy saving ECO button allows user to change to a lower, energy saving setpoint for a timed period of their choosing (1…24 hours)
•Display shows countdown of time remaining in ECO energy saving mode
EN0H 8580 UK07 R1 03/09
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
SPECIFICATIONS
ELECTRICAL
Room thermostat
Power supply : 2 x 1.5V IEC LR6 (AA) Alkaline cells
Battery life |
: Minimum 2 years (with correctly specified |
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alkaline cells) |
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Battery low |
: Display indicates when battery power |
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warning |
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reserve is low. Unit will continue to |
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function for a minimum of 4 weeks after |
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the first indication is given |
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Battery |
: Configuration settings stored in NVRAM, |
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replacement |
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so are retained during battery |
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replacement |
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Relay Box |
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Power supply |
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230 V, 50…60Hz 1VA max. Note – |
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requires permanent mains power supply |
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Switch type |
: SPDT (single pole double throw ) |
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potential free |
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Electrical rating |
: 24…230 V, 50…60 Hz, 5 A resistive, 3 A |
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inductive (0.6pf) |
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Relay life |
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100,000 operations minimum |
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Wiring |
: Terminal block for mains and relay wiring, |
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for wires up to 2.5mm² |
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Wiring access |
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Rear and left side |
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RF SPECIFICATION
Operation band |
: ISM (868.0-868.6) MHz, 1% duty cycle |
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Communication |
: 30 m in a residential building environment |
range |
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Communication |
: 2-way RF, using short, high rate |
technology |
transmissions to minimise air time and |
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avoid collisions |
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Blocking |
: Receiver class 2 (ETSI EN300 220-1 |
immunity |
version 2.1.1) |
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RF binding |
: Units are pre-bound at the Factory. Field |
method |
re-binding can be done, if required |
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RF test features |
: Transmission and signal strength tests to |
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assist location of components |
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ENVIRONMENTAL & STANDARDS
Operating |
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0°C to 40°C |
temperature |
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Shipping & |
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-20°C to 55°C |
storage |
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temperature |
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Humidity |
: Humidity range 10% to 90% rh, non- |
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condensing |
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IP class |
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IP30 |
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Approvals |
: CE mark, complying with standards |
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EN60730-1 (2001), EN60730-2-9 (2002), |
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EN55014-1 (2006), EN55014-2 (1997), |
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ETSI EN300 220-3, ETSI EN301 489-3 |
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: WEEE & RoHS compliant |
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TEMPERATURE CONTROL
Sensing element |
: 10K (@25°C ) NTC thermistor |
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: 5°C to 35°C setpoint range in 0.5°C |
Temperature |
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setting range |
increments |
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: Self-learning TPI Fuzzy Logic algorithm |
Control form |
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: 1.5°C adjustable up to 3°C in 0.1°C |
Proportional |
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band |
increments |
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: 1 minute, adjustable up to 5 min in 1 min |
Minimum on/off |
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time |
increments |
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: Adjustable to suit the application 3, 6, 9, |
Cycle rate |
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12 cycles per hour |
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: ± 0.5°C (or better) at 20°C, 50% load and |
Temperature |
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control accuracy |
3°C /hour temperature ramp |
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: 5°C when thermostat switched to |
Frost protection |
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off/standby, adjustable 5°C to 16°C |
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: Frost protection not available in cooling |
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mode |
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: Positive off possible (no frost protection) |
Positive off |
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by setting in Installer Mode |
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: Setpoint default 18°C, adjustable 5°C to |
ECO energy |
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saving |
35°C |
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: If temperature measurement system fails, |
Fail-safe |
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operation |
unit will continue to operate on the |
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assumption of a 10% load |
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: If RF communication fails, relay box can |
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be set to switch off or operate at 20% on |
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: Pressing the button on the relay box will |
Relay box |
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manual override |
temporarily override the current relay |
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position. The relay status may change |
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with the next communication from the |
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room thermostat |
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USER INDICATIONS |
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Information |
: Current room temperature, setpoint, |
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off/standby mode, relay box relay status |
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(flame), RF communication, ECO mode |
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active, ECO mode countdown. |
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: Frost protection, internal fault, battery |
Warnings |
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low, loss of RF communications. |
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: Lockout (operation not permitted) and |
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boiler fault are possible, depending on |
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application and configuration of other RF |
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products. |
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METRICS |
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Dimensions |
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90 x 92 x 27mm (thermostat) |
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: 90 x 92 x 30.5 mm (relay box |
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: 157 x 115 x 105 mm (pack) |
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154g (thermostat with batteries) |
Weights |
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96g (relay box) |
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380g (pack) |
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EN0H 8580 UK07 R1 03/09 |
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DT92 WIRELESS DIGITAL ROOM THERMOSTAT |
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ORDERING SPECIFICATION |
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Model |
Description |
Literature |
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DT92A1004 |
Wireless digital room thermostat |
Multi-lingual |
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(System pack, comprising DT92A room thermostat + BDR91 Relay Box) |
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DT92E1000 |
Wireless digital room thermostat with ECO energy saving feature |
Multi-lingual |
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(System pack, comprising DT92E room thermostat + BDR91 Relay Box) |
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Note: the room thermostat and relay box in each system pack are pre-bound (linked together) at the factory. This means they will recognize and communicate with each other as soon as they are powered up. The complete device is therefore ready for immediate installation.
CONTROLS / DISPLAY LAYOUT
Room Thermostat |
Room Thermostat |
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DT92A |
DT92E |
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frost protect indicator heating demand indicator |
ECO mode active |
ECO countdown indicator |
temperature display |
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setpoint change buttons |
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ECO button |
setpoint indicator |
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off/standby button |
fault indicator |
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battery low warning |
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off/standby indicator |
ECO mode countdown timer |
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RF communications indicator
Relay Box
BDR91
green LED, indicates
• relay on/off status
• transmission test
push button
red LED, indicates
• status in binding or reset modes
• loss of RF communications
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EN0H 8580 UK07 R1 03/09 |
DT92 WIRELESS DIGITAL ROOM THERMOSTAT
MAIN FEATURES
Extra-Large Display
The DT92 has a large display, ensuring it is easy to read and allowing essential information to be displayed, when required. The large characters and high contrast screen are especially important for those with impaired vision.
Simple Interface
The user interface has been made as simple as possible to make DT92 very easy to use. Buttons have been labeled ▲ and ▼ to identify them as the means of increasing and decreasing (respectively) the setpoint temperature. The display normally shows the actual room temperature. When one of the buttons is first pressed, the setpoint temperature is shown flashing, accompanied by the ▲ and ▼ symbols. Further buttons presses will increase or decrease the setpoint in increments of 0.5°C.
Off/Standby Button, with Frost Protection
The off/standby button allows DT92 to switch off the heating (or cooling) system at the touch of a button. To prevent accidental switch-off, the button must be held for 2 seconds to activate the change. When off, DT92 will maintain control at a frost protection setpoint, factory set to 5°C but adjustable between 5 and 16°C. If required, frost protection can be switched off, to provide a positive off function. These adjustments are made by entering the DT92 Installer Mode.
Installer Mode
The Installer Mode is where DT92 can be configured for different applications, and customized to meet the needs of the user. The operating properties that can be adjusted are called parameters, and these are described in detail on page 6.
Parameters are as follows:
•Minimum on/off time
•Cycle rate
•Proportional band width
•Temperature measurement offset
•Upper setpoint limit
•Lower setpoint limit
•Energy saving ECO temperature (on DT92E only)
•Selection of heat/cool changeover operation
•Off/Standby setpoint
•Room temperature sensor use (when used with HR80 intelligent radiator valves
•Failsafe operation mode (if RF comms are lost)
•HR80 window open function enabling
•HR80 local override function enabling
•Reset all parameters to factory settings
Installer Mode is entered via a sequence of button presses. The buttons are also used to scroll between parameters and to make changes to their values.
2-Way RF Communications
RF communications between the room thermostat and the relay box is 2-way, making it more efficient and reliable, and allowing the room thermostat to display information from the relay box, such as actual relay status or communications loss.
Signal Strength Test Mode
Another benefit of 2-way RF is to allow the room thermostat to display the strength of the signal that the relay box is receiving. This ensures the thermostat can be positioned in the best possible location for system performance.
Reliable RF Communications in 868MHz band
868MHz is a well regulated band where continuously transmitting devices are not permitted. Together with a 1% transmission duty cycle, this means the possibility of interference or clashing messages is minimized, and increases the reliability of communications.
NVRAM Storage of Settings
All parameter settings are stored in a special kind of memory called NVRAM so they will be retained indefinitely even if the batteries are removed.
Advanced Self-learning TPI Control
DT92 uses a self-learning ‘fuzzy logic’ time-proportional control algorithm. This form of control is better than conventional PI control as it has a faster response and better performance in steady state conditions. It performs equally well in a wide range of different installations, and ensures energy savings by controlling closer to setpoint and minimising temperature overshoots.
Additional Energy saving ECO feature
In a heating system, one of the best ways to save energy is to reduce the setpoint temperature. The DT92 green ECO button provides a simple and convenient way of doing this for a period of time of the user’s choice. The ECO energy saving setpoint is pre-defined in the Installer Mode. The factory setting is 18°C, but it can be adjusted (between 5°C and 35°C) to give a timed boost, if required. When the ECO button is pressed, the user is given the chance to set the time required at this new temperature, from 1 hour to 24 hours in 1 hour increments. The display indicates that ECO mode has been set, and will count down the time remaining in energy saving mode. Should they wish to readjust the temperature setting, they can do that too, using the ▲ and ▼ buttons.
ECO mode is cancelled simply by pressing the ECO button again.
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DT92 WIRELESS DIGITAL ROOM THERMOSTAT
INSTALLATION
Installation Process
To ensure best system performance, there is an optimum sequence of installation operations and test steps. These are as follows:
1.Install BDR91 relay box, connect to mains, and power up.
2.Before mounting DT92 thermostat onto backplate, power it up (activate batteries).
3.Bring DT92 thermostat to a distance 2-3 m from relay box and initiate RF Communication Test. This confirms that relay box is wired correctly and that both devices are bound (linked) to each other. If this test does not work, the 2 units must be reset and bound to each other by following the procedure for Binding / Re-binding.
4.Take the DT92 thermostat to the proposed mounting location, and initiate the Signal Strength Test. This will indicate if the thermostat is suitably positioned to provide a reliable signal for the relay box. If the signal strength is too low, the thermostat must be repositioned.
5.When a suitable position is established, the backplate can be mounted on the wall and the thermostat can be attached to it.
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Installing the BDR91 Relay Box
For best performance, the BDR91 Relay Box should be installed in an open space, at least 30cm distance from any metal objects including wall boxes and boiler housing. It should not be mounted on a metal wall box.
Location
a. b.
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DT92 WIRELESS DIGITAL ROOM THERMOSTAT
WIRING CONNECTIONS
a. |
b. |
c. |
d. |
a. Boiler |
Note: BDR91 Relay Box requires a permanent mains power supply. |
b.Boiler (potential free connection)
c.Zone valve
d.Air conditioner
Completing the BDR91 Relay Box Installation
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