Honeywell DT90 thermostat
Contents
1. 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 Large high contrast display with easy to read characters Simple user interface Temperature setting procedure eliminates the risk of accidental setpoint change Display shows room temperature with option to inquire about setpoint 5 C to 35 C setpoint range with 0 5 C increments Temperature set using up or down buttons Off standby button allowing manual switch off with frost protection active Adjustable off standby setpoint 5 C to 16 C or DT90 can be set to off completely Battery powered by 2 x AA LR6 alkaline cells Up to 4 years battery life minimum 2 years with battery low warning Honeywe D190 DIGITAL ROOM THERMOSTAT PRODUCT SPECIFICATION SHEET The new DT90 family of digital room thermostats is a range of market leading products designed to provide comfort with economy in modern heating systems Its large display and simple button interface make DT90 extremely easy to use 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 d cor and a r2. Frost protection 5 C when thermostat switched to off standby adjustable 5 C to 16 C Frost protection not available in cooling mode Positive off Positive off possible no frost protection by setting in Installer Mode ECO energy Setpoint default 18 C adjustable 5 C to savin 35 C If temperature measurement system fails unit will continue to operate on the assumption of a 10 load METRICS unit pack Weight unit 165g Weight pack 192g ENOH 8578 UKO7 R1 12 08 ORDERING SPECIFICATION DT90 DIGITAL ROOM THERMOSTAT Model Description Z o Z o Literature O o o DT90A1008 Digital room thermostat Multi lingual DT90E1012 Digital room thermostat with ECO energy saving feature Multi lingual MAIN FEATURES Extra Large Display The DT90 display is more than double the size of its predecessor ensuring it is even easier to read and allowing more 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 DT90 very easy to use Buttons have been labeled A 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 accompa
3. button immediately puts the thermostat temperature into energy saving mode where it will control at this predefined temperature for as long as the user wishes This temperature can be set from 5 C to 35 C Heating or Cooling DT90 can be used for heating or cooling applications If heating cooling changeover is operation selected the thermostat can be manually switched from heating to cooling and back again by pressing and holding the A and buttons together for 3 seconds Off standby setpoint When the off standby button is activated the DT90 will control to a special off standby setpoint By default this is set to 5 C to provide frost protection but it can be set up to 16 C if required It can also be set off by setting the parameter value to to provide a positive off function In cooling mode the default setting is off Electric heat operation lf a direct electric heating application gt 3A switching current is required DT90 will use more energy to operate its relay and so ensure the higher current is switched reliably This provides a means of resetting all the parameters to the factory supplied values Some parameters require to be set to match specific applications Recommended settings are shown in the table below Specific Applications Setting What requires to be changed ee o e hour on off time a SS lt 30kW set cycle rate to 3 cycles hour Thermal actuator p Set cycle rate to 12 cycles hour Zone va
4. following general points should be observed 1 Ensure the system contains a room temperature thermostat and a hot water temperature thermostat except for Combi boiler systems and that both are set to appropriate temperature levels 2 Programme the heating and hot water to be off when the house is not occupied If possible frost damage to any exposed pipework is a concern it is advisable to fit a frost protection thermostat or system Honeywell can advise on this 3 It is normal to have the heating system switched off or set back at night when heating is not required 4 Think about how domestic hot water is used In a storage system it is not necessary to have this switched on all the time even when the house is occupied 5 Do not programme excessive heatup times for the central heating If the occupier is out of the house or still in bed much of this heating would be unnecessary 6 Inthe evening when the house is up to temperature it is often possible to switch the heating off up to an hour before going to bed without any noticeable reduction in comfort The DT90 product family and its associated documentation and packaging are protected by various intellectual property rights belonging to Honeywell Inc and its subsidiaries and existing under the laws of the UK and other countries These intellectual and property rights may include patent applications registered designs unregistered designs registered trade marks unregistered t
5. ange of valued features for users and installers alike DT90 sets the standard for simple environmentally friendly room thermostats Simple battery change by unclipping front cover Installer Mode allows the thermostat to be customised for the application and the needs of the user e NVRAM storage of setup parameters ensuring these are never lost Setpoint limits can be programmed in 24 230Vac SPDT potential free contacts for simple 2 wire installation 8 A resistive 3 A inductive switch rating Surface or switch box mounting options Sensor fault self diagnostics Heat cool changeover operation mode possible FEATURES UNIQUE TO DT90E 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 ENOH 8578 UKO7 R1 12 08 CONTROLS DISPLAY LAYOUT DT90A frost protect indicator heating demand indicator temperature display setpoint indicator fault indicator battery low warning off standby indicator SPECIFICATIONS ELECTRICAL Power supply 2x 1 5V IEC LR6 AA Alkaline cells Battery life Typically 4 years minimum 2 years with correctly specified alkaline cells Battery low Display will indicate when battery power warning reserve is low Unit will continue to function for a minimum of 4 weeks after the first indication is given Swi
6. he DT90 switching relay has a high specification and wide switching range suitable for most domestic applications As the thermostat is battery powered only a 2 wire connection is required to operate the load Electric heating loads up to 8A 1 6kW can be switched directly but please note that if more than 3A is being switched the electric heat parameter EH should be set to value 1 in the Installer Mode This ensures the relay is operated with a higher energy to switch higher currents reliably ENOH 8578 UKO7 R1 12 08 INSTALLATION Location DT90 is for use in normal domestic environments and so should be located inside the house or building where the ambient temperature is within the range 0 to 40 C Avoid locations with high levels of condensing moisture As the temperature control element in the heating cooling system DT90 MUST be located in a position with good air circulation at average room temperature on an inside wall 1 2 to 1 5m from the floor Do NOT position the thermostat near sources of heat radiators hot air vents TV or lights near doors or window or in direct sunlight Mounting DT90 can be mounted directly on the wall or onto an electrical wall box The unit is supplied in 2 x halves to enable quick and easy installation of the wiring backplate Wiring DT90 is for fixed wiring only and must be installed in accordance with the latest Electrical Regulations Ensure the wiring connection to the supp
7. ions with oil boilers or air conditioning applications with compressors Recommended settings are shown in the next table Cycle rate 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 Proportional band width The proportional band is the temperature band adjacent to the set temperature point within which the thermostat will cycle the controlled output to control the boiler for example Above or below this band the output will either be fully on or fully off The band can be adjusted up to 3 C default 1 5 C to provide improved temperature control This is useful for a well insulated homes with over sized heating systems or b air systems with a fast response Temperature If the thermostat is located in a particularly hot cold location and cannot be moved measurement offset because of the wiring then the measured displayed temperature can be adjusted by 3 C This is useful if the homeowner wants the reading to match the temperature display on another appliance Upper Lower The normal upper temperature limit of 35 C can be reduced as low as 21 C to save temperature limits energy The normal lower limit of 5 C can be raised as high as 21 C to protect inhabitants from the cold Energy saving ECO On the DT90E ECO model pressing the ECO
8. lve 1 No changes required Air pot NN Configure the thermostat to allow switching between conditioning heating and cooling modes set parameter HC 1 2 Set the thermostat to the required mode of operation heating or cooling by pressing the A and YW buttons together for 3 seconds when in normal run mode Heatpump Air Set minimum ON OFF time to 4 minutes conditioner Set cycle rate to 3 cycles hour Fan coil unit 6 1 Nochanges required O o Z oZ So O 6 ENOH 8578 UKO7 R1 12 08 DT90 DIGITAL ROOM THERMOSTAT INSTALLER MODE HOW TO SET PARAMETERS Each parameter is identified by a 2 letter code and has a range of values These are shown in the table below followed by instructions on how to enter Installer Mode how to select a parameter and change its value and finally how to exit Installer Mode Cyclerate Cr C8 6 9 12 cyclesfhour 6 _ Proportional band width PO HO BOT PC Temperature measurement offset tO 3t0o30 0 Lower setpoint limit 5 to 21 C Energy saving ECO temperature ES 5 to 35 C this parameter is only available on the DI90E model 1 enable 5 to 16 C 1if gt 3A FS Resetparameters FS 0 1 1 factory settings In cooling mode the off standby setpoint defaults to OFF To enter Installer Mode a Put DT90 into off standby mode by pressing and holding the off standby button for 2 seconds b Now press and hold both A and W tempera
9. ly is via a fuse rated at no more than 8 amps and a switch having contact separation of at least 3mm in all poles formerly Class A Completing the Installation After wiring is complete the front piece is attached to the backplate with a hinging action until it clips into place DT90 DIGITAL ROOM THERMOSTAT CAUTION isolate power supply and make safe before wiring the unit to prevent electric shock and equipment damage Installation should be carried out by a qualified Electrician or competent Heating Engineer ENOH 8578 UKO7 R1 12 08 DT90 DIGITAL ROOM THERMOSTAT WIRING CONNECTIONS 24 230 V Boiler Boiler potential free connection Thermal actuator Zone valve Electric actuator Electric heat maximum 1 6kW direct switching PRT PRODUCT DIMENSIONS E i 5 ENOH 8578 UKO7 R1 12 08 DT90 DIGITAL ROOM THERMOSTAT INSTALLER MODE APPLICATIONS SETTINGS The DT90 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 These are described below Description and typical use Minimum ON OFF time DT90 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 applicat
10. nied by the A and VW 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 DT90 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 DT90 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 DT90 nstaller Mode Installer Mode The Installer Mode is where DT90 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 e Minimum on off time Cycle rate Proportional band width Temperature measurement offset Upper setpoint limit Lower setpoint limit Energy saving ECO temperature on DT90E only Selection of heat cool changeover operation Off Standby setpoint Electric heat operation e 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 NVRAM Storage of Settings All parameter settings are stored in a s
11. pecial kind of memory called NVRAM so they will be retained indefinitely even if the batteries are removed Advanced Self learning TPI Control DT90 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 DT90 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 A and Y buttons ECO mode is cancelled simply by pressing the ECO button again 24 230V 8 3 A SPDT Potential Free Contact Rating T
12. rade marks and copyrights Honeywell reserves the right to modify this document product and functionality without notice This document replaces any previously issued instructions and is only applicable to the product s described This product has been designed for applications as described within this document For use outside of the scope as described herein refer to Honeywell for guidance Honeywell cannot be held responsible for misapplication of the product s described within this document Manufactured in the UK for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sarl ACS ECC EMEA Z A La Pi ce 16 1180 Rolle Switzerland by its Authorised Representative Honeywell Inc Honeywell Honeywell Control Systems Ltd Newhouse Industrial Estate Motherwell ML1 5SB United Kingdom http europe hbc honeywell com ENOH 8578 UKO7 R1 12 08
13. tch type SPDT single pole double throw potential free Electrical rating 230 V 50 60 Hz 0 01 Ato8A resistive 0 1 A to 3 A inductive 0 6pf 24 V 0 60 Hz 0 01 A to 8 A resistive 0 1 A to 3 A inductive 0 6pf Relay life 100 000 operations minimum Wiring Terminal block capable of accepting wires up to 2 5mm Wiring access Rear top and left side ENVIRONMENTAL amp STANDARDS Operating OT to 40 C temperature Shipping amp storage temperature Humidity 20 C to 55 C Humidity range 10 to 90 rh non condensing IP30 Approvals CE mark complying with standards EN60730 1 2001 EN60730 2 9 2002 EN55014 1 2001 EN55014 2 1997 WEEE amp ROSH compliant C tick IP class DT90 DIGITAL ROOM THERMOSTAT DT90E ECO mode active ECO countdown indicator setpoint change buttons ECO button off standby button ECO mode countdown timer TEMPERATURE CONTROL Sensing element 10K 25 C NTC thermistor Temperature 5 C to 35 C setpoint range in 0 5 C setting range increments Control form Self learning TPI Fuzzy Logic algorithm Proportional 1 5 C adjustable up to 3 C in 0 1 C band increments Minimum on off 1 minute adjustable up to 5 min in 1 min time increments Cycle rate Adjustable to suit the application 3 6 9 12 cycles per hour Temperature 0 5 C or better at 20 C 50 load and control accuracy 3 C hour temperature ramp
14. ture adjustment buttons for 3 seconds until the display shows the word Inst c Press the A button to get to the first parameter Ot The parameter code is shown on the display separated by a colon from the parameter value To select and change a parameter d Usethe A and VY buttons to move from one parameter to another e Press the off standby button to select the parameter value ready to change f Usethe A and F 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 To exit Installer Mode g Press and hold the off standby button for 3 seconds Note Installer Mode will exit automatically after 10 minutes if no buttons are pressed 7 ENOH 8578 UKO7 R1 12 08 DT90 DIGITAL ROOM THERMOSTAT INSTALLER MODE FLOWCHART ES parameter Only available on DT90E models ENERGY EFFICIENCY AND THE ENVIRONMENT Home energy use is currently responsible for more than 1 4 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 DT90 temperature controls should be used in conjunction with appropriate time controls In order to save energy the
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