User manual HONEYWELL DT92

[. . . ] WIRELESS DIGITAL ROOM THERMOSTAT PRODUCT SPECIFICATION SHEET 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. [. . . ] The red LED will give a brief flash every second to verify reset has happened. Put Relay Box into Binding Mode Press and hold the push button for 5s to put the BDR91 relay box into binding mode. The red LED will flash 0. 5 seconds on, 0. 5 seconds off to verify it is now in binding mode. The BDR91 relay box will remain in binding mode for 3 minutes, before generating an error message if no valid binding instruction has been received. It must be put back into binding mode if further attempts to bind are required. 10 DT92 WIRELESS DIGITAL ROOM THERMOSTAT Reset Stored Data in Room Thermostat Follow the sequence of steps below to reset the stored binding data in the room thermostat. Put Room Thermostat into Binding Mode Bind Room Thermostat to Relay Box With both units in binding mode, pressing the off/standby button on the room thermostat will bind them together. To verify it is now bound, the red light on the relay box will immediately stop flashing. After about 5 seconds, the room thermostat will come out of binding mode and go back to off mode. 11 DT92 WIRELESS DIGITAL ROOM THERMOSTAT SYSTEM OPERATION RF Signal Propagation As the DT92 room thermostat and relay box communicate using RF technology, special care must be taken during installation. The location of the RF components as well as the building structure may influence performance of the RF system. DT92 uses 2-way RF technology, and this allows the signal strength to be measured and communicated, to ensure correct placement of the room thermostat in a high signal strength area. See RF Communication Test and Signal Strength Test sections for a description of these features. Within a typical residential building the two products should communicate reliably within a 30m range. It is important to take into consideration that walls and ceilings will reduce the RF signal. The strength of the RF signal reaching the Relay Box depends on the number of walls and ceilings separating it from the room thermostat, as well as the building construction the diagram below illustrates an example of typical signal strength reduction. Walls and ceilings reinforced with steel or plasterboard walls lined with metal foil reduce the RF signal significantly more. Automatic Operation The display on the DT92 room thermostat will indicate (by means of the flame symbol) the actual status of the relay in the BDR91 relay box. The green LED on the BDR91 relay box will illuminate when the relay is on, and will go off when the relay is switched off. 12 DT92 WIRELESS DIGITAL ROOM THERMOSTAT Temporary Manual Override Pressing the button on the BDR91 will temporarily override the current relay operation. The green LED will indicate the relay position. Loss of RF Communications If RF communications is lost, for whatever reason, the BDR91 relay box will operate in failsafe mode (as set in the Installer Mode) and the red LED will illuminate. The DT92 room thermostat will flash the RF symbol until communications are restored. PRODUCT DIMENSIONS 90 27 90 30. 5 92 13 DT92 WIRELESS DIGITAL ROOM THERMOSTAT INSTALLER MODE ­ APPLICATIONS SETTINGS The DT92 has a special Installer Mode where some features can be adjusted to suit the application and the needs or lifestyle of the user. Each adjustable feature is called a Parameter. Parameter Minimum ON/OFF time Description and typical use DT92 is able to set a minimum limit for the on and off times of the controlled device or appliance, to prevent damage or excessive wear. This minimum time can be set to 1, 2, 3, 4, or 5 minutes, and is particularly important for heating applications with oil boilers, or air conditioning applications with compressors. Recommended settings are shown in the next table. Within the control proportional band, the output will be cycled several times per hour, to give precise temperature control. This can be set to 3, 6, 9, or 12 cycles, depending on the application. Recommended settings are shown in the next table. [. . . ] Use the and buttons to adjust the parameter value. When the correct value is flashing, confirm the selection by pressing the off/standby button again, returning to the parameter menu. Press and hold the off/standby button for 3 seconds Note: Installer Mode will exit automatically after 10 minutes if no buttons are pressed. INSTALLER MODE - FLOWCHART ES parameter Only available on DT92E model 16 DT92 WIRELESS DIGITAL ROOM THERMOSTAT ENERGY EFFICIENCY AND THE ENVIRONMENT Home energy use is currently responsible for more than ¼ of the total carbon emissions which contribute to climate change. Heating and hot water systems based on boilers account for 2/3 of this figure, so it is important to understand how controls can help to maximize energy efficiency while maintaining comfort. [. . . ]