Honeywell Thermostat THR840DUK User's Manual
Contents
1. User Manual homexpert by Honeywell homexpert by Honeywell THR840DUK Digital Thermostat 50051982 001 Rev A WARNING This product must be correctly installed and configured to work properly see pages 12 24 If you are not experienced in wiring electrical equipment we recommend professional installation to avoid possible personal injury or equipment damage TIP After installation see the QUICK START GUIDE on page 6 to customise and begin using your new thermostat right away recommended CE Copyright 2010 Honeywell International Inc homexpert by Honeywell is a trademark of Honeywell International Inc All rights reserved Certification mark H About your new thermostat What is a room thermostat n 4 5 QUICK START GUIDE 6 Quick reference to CONTIOIS ccceeeeeeee ees Operation EEEE E E 8 Heating or cooling Controlere sasise 9 Temperature CONtrOl ccccccceceeeeeeeeeeaees 10 Energy saving ECO Mode csseeeeeees 11 Installation and setup System installation T gt Wall bracket installation cccccseeeeeeeees 13 SVSIEM WiN aessa 14 17 Battery installation amp MOuUNtINg eese 18 DVSICMVISSL ociscene ranir 19 Mstaler SOT eccrssoneruiranca ra 20 24 homexpert by Honeywell THR840DUK Digital Thermostat Appendix Micase Or MCU seian 25 Warranty informatio essensie 26 Disposal amp TECYCIING ci isuicecrusoscnalocsvernteaaees 2r WE NOTE Thi2. See page 23 Proportional band width If your heating system is oversized for your home you can compensate by increasing the width of the control proportional band up to 3 C Temperature offset In some cases the thermostat must be installed in a location that does not accurately control temperature for optimum comfort in other rooms You can set the thermostat to compensate for this by adjusting the offset uL Maximum temperature When the A button is pressed the thermostat will not allow a target temperature above the maximum you set 24 LL Minimum temperature When the V button is pressed the thermostat will not allow a target temperature lower than the minimum you set ES ECO default temperature This is the default target temperature when the thermostat is in ECO mode see page 11 HC Heating cooling options When set to 1 the thermostat can control both heating and cooling systems see page 9 OS Frost protection temperature Minimum temperature allowed when the thermostat is off see page 8 EH Electric heat Check proper setting for your system See page 23 homexpert by Honeywell THR amp 840DUK Digital Thermostat In case of difficult Thermostat screen is blank Heating or cooling system does not respond Desired temperature cannot be maintained e Make sure two fresh AA alkaline batteries are properly installed see page 18 Check thermostat batteries See above Make sure he
3. alve Electric resistance Thermal actuator Zone valve drive open drive closed heater THR840D Installation and Setup homexpert by Honeywell THR amp 840DUK Digital Thermostat Activate batteries and mount thermostat System test Remove the thermostat cover See page 13 Discard the plastic tab Set temperature to maximum After installation you should check to make sure the system is inside to activate the batteries then replace batteries The thermostat A working properly should display the current room temperature 1 Check the power supply to make sure the heating system is on Replace the thermostat front cover then mount the thermostat on the v wall bracker as shown at lait 2 Press the A button to raise target temperature to maximum l 35 C WE NOTE This symbol will flash on the screen when battery If the system is set up properly the heating symbol should power is low Remove cover and replace batteries with appear on the thermostat display and the heating system should two fresh AA alkaline batteries begin running Heat should turn on 3 To stop the test press the VW button to lower the target temperature to an appropriate level The heating system should turn off and the heating symbol on the thermostat screen should disappear 18 19 Installation and Setup Installer setup Function Setting Installer settings allow you to customise how your system works Check the tabl
4. arget Press buttons to display or change target S temperature for a specified period of time see page 11 temperature A O 10 homexpert by Honeywell THR840DUK Digital Thermostat Energy saving ECO mode Press to enter ECO mode The ECO mode overrides thermostat settings to maintain a different temperature for 1 to 24 hours This can be useful to reduce heating or cooling costs when you are away from home 1 Press the green ECO button to display timer 2 Press the A or V buttons to set timer 1 24 hours While in ECO mode the screen will alternately display remaining time and current room temperature After the timer expires the thermostat will resume normal operation Options e Press the A or buttons to raise or lower the temporary ECO temperature if needed e Press the ECO button again to cancel ECO mode and resume normal operation NOTE The default ECO temperature is pre set to 18 C To raise or lower the default temperature see page 22 11 Installation and Setup homexpert by Honeywell THR amp 840DUK Digital Thermostat Wall bracket installation System installation Remove the thermostat cover and use a screwdriver to pry open the tabs as shown at left then remove the thermostat from the wall bracket Install about 1 2 to 1 5 metres above Installation procedure Disconnect electric power k 2 Choose thermostat location and the floor where the
5. ating or cooling system has power Check fuses and circuit breakers and replace or reset as needed Check wiring pages 14 17 and system configuration pages 20 24 If above remedies cannot resolve the problem the thermostat may have to be moved Make sure it is not installed near sources of hot or cold air radiators windows heating or cooling ducts If this symbol flashes on the screen during normal operation a fault has occurred Contact Honeywell Customer Care for assistance See back cover for contact information 25 Appendix Limited Warrant Honeywell warrants this product for 1 year from date of purchase We undertake to replace or repair at our discretion products should they become defective within 1 year solely as a result of faulty materials and or workmanship Understandably if the product has not been installed or maintained in accordance with Honeywell s instructions has not been used appropriately or if any attempt has been made to rectify dismantle or alter the product in any way the warranty will be invalidated This product warranty states Honeywell s entire liability It does not extend to cover consequential loss or damage or installation costs arising from a defective product If the product is defective please return it together with a proof of purchase or receipt to the place of purchase This does not affect your statutory rights If you require further information about this product
6. call the homexpert by Honeywell technical helpline on 0845 604 2893 For a full list of terms and conditions please visit www homexpertbyhonyewell com 2010 Honeywell International Inc 26 homexpert by Honeywell THR amp 840DUK Digital Thermostat Disposal and recyclino Disposal and recycling Batteries and waste electrical products should not be disposed of with household waste Please recycle where these facilities exist Check with your local authority or retailer for recycling advice Please retain these instructions for future reference 27 Need Help For assistance with this product please visit www homexpertbyhoneywell com or call Honeywell Customer Care at 0845 604 2893 E recommended O Certification mark Honeywell The Arnold Centre Paycocke Road homexpert Basildon Essex by Honeywell SS14 3EA Technical Help Desk 0845 604 2893 50051982 001 Rev A www homexpertbyhoneywell com 2010 Honeywell International Inc
7. display screen can be easily seen install wall bracket Do not install near sources of hot or cold air radiators eJ 3 Connect system wiring windows heating or cooling ducts E 2 4 Activate batteries and attach thermostat cover N 5 Restore electric power 6 Setup and test system operation Q NOTE If you are not experienced in equipment installation we recommend that these procedures be done by a professional installer A DISCONNECT ELECTRIC POWER BEFORE INSTALLATION Can cause electrical shock or equipment damage 12 13 Installation and Setup Connect system wiring aSo A lt A I 7 7 az NG NA 6 mm max 14 Connect wiring from your heating or cooling equipment to the thermostat as shown at left See wiring diagrams on pages 15 17 for details 1 Make sure electrical power is off 2 Strip insulation to expose about 6 mm of bare wire 3 Use a screwdriver to loosen terminal screw insert wire into slot then tighten screw 4 Replace thermostat cover then restore electrical power NOTE All wiring must comply with IEE regulations Keep AC mains supply load cables separate from equipment wiring Wiring diagrams Basic boiler 15 homexpert by Honeywell THR840DUK Digital Thermostat Combi boiler THR840D Installation and Setup homexpert by Honeywell THR amp 840DUK Digital Thermostat ita tate KLET lactate WALLT KLET lactate Zone v
8. e to any level between 5 and 16 C or turn this feature off so the heating system is never activated when the thermostat is off see page 22 homexpert by Honeywell THR amp 840DUK Digital Thermostat Heating or cooling control Press and hold both buttons for 5 seconds Heating changes to cooling The thermostat is pre set to control only your heating system If installed and set up correctly it can also be used to control your cooling system To switch between heating and cooling press and hold the A and V buttons together until the screen changes Q NOTE The thermostat will not switch to cooling control unless you enable this feature see page 22 0 NOTE When you change the system the Heating and Cooling symbols will appear for a few seconds then disappear Normally these symbols appear only when the heating or cooling system is running Operation Temperature control Current room temperature When idle the thermostat displays the current room temperature You can press the A or VW buttons at any time to see the target temperature the thermostat is trying to maintain One button press will display the target temperature flashing To change it press either button repeatedly until the display shows the temperature you want After a few seconds the display will stop flashing and change to show the current room temperature NOTE You can use the ECO mode to temporarily override the t
9. es on pages 21 23 to see if any settings need to be changed To change installer settings 1 Press and hold the ON OFF button for 5 seconds 2 Press and hold the A and V buttons together until the screen changes 3 Press the A or W buttons to scroll through functions quickly until you find one you want to change see list on pages 21 22 4 To change any setting press the ON OFF button then press the A or VW buttons until the correct value is flashing 5 Press the ON OFF button again to save your choice then use the A or VW buttons to select another function To exit installer setup press and hold the ON OFF button for 5 seconds 20 homexpert by Honeywell THR840DUK Digital Thermostat Installer setup functions Factory default setting Minimum boiler on off time 1 minute Options 1 to 5 minutes See page 23 for important information Cycles per hour CPH 6 cycles per hour Options 3 6 9 or 12 See page 23 for important information 3 Pb Proportional band width Log Options 1 5 to 3 C 4 tO Temperature offset O No offset Options 8 to 3 C 5 ul Maximum temperature allowed Spm Options 21 to 35 C OLL Minimum temperature allowed DOn Options 5 to 21 C 0 NOTE See descriptions of functions on page 24 21 Installation and Setup homexpert by Honeywell THR amp 840DUK Digital Thermostat Installer setup functions Customised settings for your system Enter Installer o
10. esccesseeseeeseeeeeeeeeeeeeeseeeeeeeas See pages 12 24 2 Select heating default Or COOLING MOCE cccccccseeseeeecsceeneeeeeescueesseseessceeesesesssaueaueeeessanaasseeees See page 9 3 Set desired indoor temperature cccccccccsscecceseeeeeeeseeeeeeseeeeeeseeeeeeseeeeeeeseeeeeeseeeeeeeeseeseeseeneeeeeas See page 10 6 homexpert by Honeywell THR amp 840DUK Digital Thermostat Quick reference Cooling system is ECO mode countdown Heating system is Press to change running see page 9 see page 11 running see page 9 temperature see page 10 ECO mode is on see page 11 Press to turn ECO mode on or off see page 11 Press to turn thermostat Appears when on or off see page 8 target temperature is showing Current temperature or target temperature when flashing System fault Low battery warning Standby symbol see page 25 see page 18 to replace appears when batteries thermostat is off see page 8 7 Operation On off switch and frost protection Press and hold to turn on or off System maintains Symbol appears when minimum thermostat is off temperature when thermostat is off Press the ON OFF button as shown at left to turn the thermostat on or off When off the thermostat will never activate the cooling system and will activate heating only if necessary to maintain a minimum indoor temperature of 5 C frost protection You can change the frost protection temperatur
11. rs see page 27 then press A or W for access to system settings Setting Options Your heating system Changes required Setting Options fection default temperature 18 C Standard gas boiler None No change Options 5 to 35 C r Heating Cooling options O No central cooling system installed Zone Vave sd Valve None No No change Eee pi S aad Or bo Funcion T O Sotto 4 minutes i g y a 2 OF COTO to 3 CPA noe Dior COR SEN ETENE 3G o Thermal actuator actuator Function 2 Funotion 2 Cr Setto12 CPH to 12 CPH Options none or 5 to 16 C See page 23 for important information RESET TO FACTORY DEFAULT 0 No change Your cooling system Changes required Setting Options i Select i to restore default settings All customised Heat pump air conditioner Function 1 Ot Set to 4 minutes See eee Function 2 Cr Set to 3 CPH Function 8 HC Set to 1 10 EH Electric heat O Resistive loads lt 3 A SEEC NERURO PURON A ar SO ie cal as Function 10 EH Set to 1 if load gt 3A 1 Resistive loads 3 to 8A QO NOTE See descriptions of functions on page 24 NOTE After changing the above settings to accommodate a cooling system you can switch the thermostat to control either heating or cooling see page 9 22 23 Installation and Setup Description of functions Ot Cr O tO Minimum boiler off time Check proper setting for your system see page 23 Cycles per hour Check proper setting for your system
12. s symbol will flash on the screen when battery power is low Remove cover and replace batteries with two fresh AA alkaline batteries as shown on page 18 User Manual What Is a room thermostat an explanation for householders A room thermostat simply switches the heating system on and off as necessary It works wi by sensing the air temperature switching on the heating when the air temperature falls Cm below the thermostat setting and switching it off once this set temperature has been A reached Turning a room thermostat to a higher setting will not make the room heat up A 7 any faster How quickly the room heats up depends on the design of the heating system piain E Corea for example the size of boiler and radiators Neither does the setting affect how quickly the room cools down Turning a room thermostat to a lower setting will result in the room being controlled at a lower temperature and saves energy The heating system will not work if a time switch or programmer has switched it off The way to set and use your room thermostat is to find the lowest temperature setting that you are comfortable with and then leave it alone to do its job The best way to do this is to set the room thermostat to a low temperature say 18 C and then turn it up by one degree each day until you are comfortable with the temperature You won t have to adjust the thermostat further Any adjustment above this setting will was
13. te energy and cost you more money homexpert by Honeywell THR840DUK Digital Thermostat If your heating system is a boiler with radiators there will usually be only one room thermostat to control the whole house But you can have different temperatures in individual rooms by installing thermostatic radiator valves TRVs on individual radiators If you don t have TRVs you should choose a temperature that is reasonable for the whole house If you do have TRVs you can choose a slightly higher setting to make sure that even the coldest room is comfortable then prevent any overheating in other rooms by adjusting the TRVs Room thermostats need a free flow of air to sense the temperature so they must not be covered by curtains or blocked by furniture Nearby electric fires televisions wall or table lamps may prevent the thermostat from working properly User Manual About your new thermostat The THR840DUK is an easy to use thermostat designed to maintain a comfortable environment when you are at home and reduce energy costs when you are away One touch of the ECO button overrides the normal temperature to maintain a lower energy saving level for a specified period of time see page 11 QUICK START GUIDE Your new thermostat is pre programmed and ready to go Just check the steps below and change settings if needed 1 Install and set up thermostat if this has not been done by a professional installer cccccce
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