User Manual
Contents
1. User Manual THR842DUK Wireless Digital Thermostat homexpert by Honeywell homexpert by Honeywell 50051983 001 Rev A WARNING This product must be correctly installed and configured to work properly see pages 12 23 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 cccccecccesseeeeeeeee sees 12 Relay box installation ccccecssesesseeeees 13 SYSTEM WINING asessori 14 15 Battery installation amp testing 16 17 Thermostat installation cccccccceeees 18 19 SUSE Ue ah E 20 Installer Setup cccceseessesecseeeeseeeeees 21 25 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Appendix Mi2. day until you are comfortable with the temperature You won t have to adjust the thermostat further Any adjustment above this setting will waste energy and cost you more money homexpert by Honeywell THR842DUK Wireless 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 wireless thermostat The THR842DUK 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 chec
3. descriptions of functions on page 23 23 Installation and Setup Customised settings for your system Changes required Setting Options Function 2 Cr Set to 3 CPH Your cooling system Changes required Setting Options Heat pump air conditioner Function 1 Ot Set to 4 minutes Set to 3 CPH Set to 1 Your heating system Standard gas boiler lt 3OkW Zone Valve Oil boiler Function 2 Cr Function 8 HC NOTE After changing the above settings to accommodate a cooling system you can switch the thermostat to control either heating or cooling see page 10 24 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Description of functions Ot Minimum boiler off time Check proper setting for your system see page 24 Cr Cycles per hour Check proper setting for your system see page 24 Pb 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 tO 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 25 LL Minimum temperature When the V button is pressed the thermostat
4. 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 LC Loss of communications Determines how the system operates if wireless signal is lost between thermostat and relay box Appendix In case of difficult Thermostat screen is blank Heating or cooling system does not respond e Make sure two fresh AA alkaline batteries are properly installed see page 16 Check thermostat batteries see above Make sure heating and cooling systems have power Check fuses and circuit breakers and replace or reset as needed Check wiring pages 14 15 and system configuration pages 21 25 If red light on relay box is on the thermostat and relay box may have lost communication with each other Check for metal objects or other devices that may block or interfere with the wireless signal Try the test procedures described on pages 16 20 If above remedies cannot resolve the problem the thermostat may have to be moved Try a location closer to the relay box or farther away from interference by metal objects or electronic devices such as televisions sound systems PCs etc 26
5. allation and Setup Set temperature to maximum After installation you should check to make sure the system is A Gy working properly 1 Check the power supply to make sure the system is on and the vO green light on the relay box is off 2 Press the A button to raise target temperature to maximum 35 C If the system is set up properly the heating symbol should appear on the thermostat display the heating system should Heat should turn on begin running and the green light on the relay box should be 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 20 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Installer setup Function Setting Installer settings allow you to customise how your system works Check the tables on pages 22 24 to see if any settings need to be changed To change installer settings 1 2 Press and hold the ON OFF button for 5 seconds Press and hold the A and V buttons together until the screen changes Press the A or VW buttons to scroll through functions quickly until you find one you want to change see list on pages 22 23 To change any setting press the ON OFF button then press the A or VW buttons until the correct value is flashing Press OFF again to save your choice then use the A or V
6. buttons to select another function To exit installer setup press and hold the ON OFF button for 5 seconds 21 Installation and Setup Installer setup functions Factory default setting 1 minute Options 1 to 5 minutes Minimum boiler on off time See page 24 for important information Cycles per hour CPH 6 cycles per hour Options 3 6 9 or 12 See page 24 for important information 3 Pb Proportional band width Looe Options 1 5 to 38 C 4 tO Temperature offset O No offset Options 8 to 3 C 5 ul Maximum temperature allowed oo GG Options 21 to 35 C 6 LL Minimum temperature allowed D Options 5 to 21 C T NOTE See descriptions of functions on page 23 22 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Installer setup functions Enter Installer N see page 19 then press A or W for access to system settings a default temperature 18 C Options 5 to 35 C Heating Cooling options O No central cooling system installed 1 Allows switching between heating and cooling systems Thermostat cannot control cooling unless you select 1 Frost protection temperature FE Options none or 5 to 16 C 10 LC Loss of communications O Switch relay off instruction 1 Operate relay 20 on 80 off RESET TO FACTORY DEFAULT O No change 1 Select 1 to restore default settings All customised settings will be lost T NOTE See
7. cal Help Desk 0845 604 2893 50051983 001 Rev A www homexpertbyhoneywell com 2010 Honeywell International Inc
8. case OF diMNGU siise 26 29 Warranty INfOrmation cccccsececseeeeeeeeees 30 Declarations disposal amp recycling 31 GES NOTE This symbol will flash on the screen when battery power is low Remove cover and replace batteries with two fresh AA alkaline batteries see page 16 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
9. homexpert by Honeywell THR842DUK Wireless Digital Thermostat In case of difficult Desired temperature cannot be maintained e f remedies described on page 26 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 e Press the button on the relay box to illuminate the green light and temporarily restore system function This is a manual override which will not correct the fault it will only allow the system to provide heat until the fault is corrected If the problem cannot be corrected contact Honeywell Customer Care for assistance See back cover for contact information 27 Appendix Re binding procedure If you must replace a wireless thermostat or relay box the system will not work until both devices can communicate with each other This is called binding Follow the steps below to re establish wireless communication 1 Hold thermostat about 1 or 2 metres from the relay box then press and hold the relay button for 15 seconds Press and hold relay box button Note After 5 seconds the red light flashing pattern will change but you must hold down the button for at least 15 seconds to clear previous binding information from memory Press 2 Release the relay button then press and hold it again for 5 and h
10. k the steps below and change settings if needed 1 Install and set up thermostat amp relay box if this has not been done by a professional installer ccccceecccesseescesseeeeeeeeeeeeeeseeeeeeens See pages 12 25 2 Select heating default Or COOLING MOCE cccccccssseeeeecececeeeeeeecesaueeseeseeeeauaeeeeeeeeaueaseseeesaaaaeseeees See page 9 3 Set desired indoor temperature cccccccccseseccccseeeeeeseeeeeeeeeeeeeseeeeeeseeeeeeeseeeeeesseeeeeeseeeeeeseneeeeegs See page 10 6 homexpert by Honeywell THR842DUK Wireless 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 Indicates display is showing target temperature Press to turn thermostat v on or off see page 8 Current temperature or target temperature when flashing System fault Low battery warning Wireless signal Standby symbol appears see page 27 see page 16 to replace indicator see when thermostat is off batteries page 26 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 and hold the ON OFF button as shown at left to turn the thermos
11. 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 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 30 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Declarations disposal and recyclino Declaration Honeywell hereby declares that this wireless product is in compliance with the essential requirements and other relevant provisions of the Radio and Telecommunications Terminal Equipment R amp TTE directive 1999 5 EC 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 31 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 Techni
12. n tighten screw 4 Replace relay box cover then restore electrical power NOTE All wiring must comply with IEE regulations Keep AC mains supply load cables separate from equipment wiring homexpert by Honeywell THR842DUK Wireless Digital Thermostat Wiring diagrams NLL ABC Wiring terminals Combi boiler RELAY BOX Burner direct control A B 5 A C 5 3 A 930Vru 230V 50 60Hz 50 60Hz lt lt 5A _ a N 9 N Zone valve RELAY BOX A B 5 3 A A B 5 3 A A C 5 3 A A C 5 3 A Installation and Setup Activate batteries and test thermostat i 2 3 4 Grasp and pull to remove the thermostat cover Discard the plastic tab inside to activate the batteries then test as shown below WE NOTE This symbol will flash on the screen when battery power is low Remove cover and replace batteries with two fresh AA alkaline batteries To test the thermostat Restore electrical power to the relay box Hold the thermostat 2 3 metres from the relay box Press and hold the ON OFF button to turn off the thermostat Press and hold the A and VW buttons together until the screen changes as shown at left 16 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Test thermostat continued from page 16 5 Press the V button once 6 Press and hold the W button until the screen displays TEST If the green light on the relay box does not flash the unit
13. nstallation procedure 1 Install relay box 2 Connect system wiring 3 Activate batteries and install wireless thermostat 4 Setup and test system operation NOTE If you are not experienced in equipment installation we recommend that these procedures be done by a professional installer DISCONNECT ELECTRIC POWER BEFORE INSTALLATION Can cause electrical shock or equipment damage 12 homexpert by Honeywell THR842DUK Wireless Digital Thermostat ACURA ENA o 4 13 The relay box is wired directly to your heating or cooling equipment The thermostat communicates with the relay box using a wireless RF signal to control the system Do not install near metal objects or electronic devices TV sound system PC etc 1 Make sure electrical power is off 2 Use a screwdriver to release latch and remove relay box cover Mount relay wall bracket as shown at left Install at least 30 cm from any metal objects such as metal wall boxes and metal equipment enclosures Connect system wiring as shown on pages 14 15 then replace relay box cover Installation and Setup Connect system wirinc 6 mm max 14 Connect wiring from your heating or cooling equipment to the relay box as shown at left See wiring diagrams on page 15 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 the
14. old seconds until the red light flashes evenly binding mode 3 Release the relay button then press and hold the thermostat ON OFF button to turn off the thermostat 4 Press and hold the thermostat A and V buttons until the screen changes as shown at left Press and hold 28 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Re binding procedure continued from page 28 5 Press the A button repeatedly until the display shows CLr Then press the ON OFF button to clear previous binding to other devices 6 Press the A button again to return to binding mode Press the ON OFF button again to re establish wireless communication with relay box If successful the red light on the relay box will turn off and the thermostat will return to normal operation in Off mode a few seconds later Red light should turn off 29 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
15. ress 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 Press buttons to display or change target NOTE You can use the ECO mode to temporarily override the target temperature temperature for a specified period of time see page 11 A vO 10 Energy saving ECO mode Press to enter ECO mode homexpert by Honeywell THR842DUK Wireless Digital Thermostat 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 V 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 23 11 Installation and Setup System installation Wireless 28 gt thermostat a SO Metro SN silver gt Relay box System i wiring Heating cooling systems I
16. s are not bound together See page 28 and follow the instructions to re establish wireless communication Relay box 17 Installation and Setup Test thermostat location continued from page 17 Test signal strength to find a suitable location for the thermostat before installation Press and hold While still in Test mode see pages 16 17 press and hold the W Bee button until the screen changes as shown then move the thermostat and check the screen display until you find a suitable location Check Signal strength wireless signal m j 0 2 No Move the thermostat to another location strength am 3 5 Yes Location is good Press and hold the ON OFF button to stop the test oG Press and hold to stop 18 homexpert by Honeywell THR842DUK Wireless Digital Thermostat Install thermostat Wall bracket The wireless thermostat can be mounted in the table stand or on a wall For wall mounting remove the thermostat cover and use a screwdriver to separate the thermostat from the wall bracket as shown at left Install the wall bracket about 1 2 to 1 5 metres above the floor e Do not install near sources of hot or cold air radiators windows heating or cooling ducts e Install at least 30 cm from metal objects e Install at least 1 metre away from other electronic devices TV sound system PC etc Table stand assembly 19 Inst
17. tat 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 temperature 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 23 homexpert by Honeywell THR842DUK Wireless 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 23 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 p
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