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Honeywell THR840DUK manual

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Table of contents for the manual

  • Page 1

    User Manual THR840DUK Digital Thermostat 50051982-001 Rev . A[...]

  • Page 2

    homexpert tm by Hone ywell THR840DUK Digital Thermostat 3 About your ne w thermostat What is a room thermostat? .................. 4-5 QUICK ST ART GUIDE ............................. 6 Quick refer ence to controls ....................... 7 Operation On/off switch ............................................ 8 Heating or cooling control ...........[...]

  • Page 3

    User Manual 4 homexpert tm by Hone ywell THR840DUK Digital Thermostat 5 ...an explanation f or householders A room thermostat simply switches the heating system on and of f as necessary . It works by sensing the air temperature, switching on the heating when the air temperatur e falls below the thermostat setting, and switching it off once this set[...]

  • Page 4

    User Manual 6 homexpert tm by Hone ywell THR840DUK Digital Thermostat 7 The THR840DUK is an easy-to-use thermostat designed to maintain a comfortable environment when you are at home and r educe 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 pe[...]

  • Page 5

    Operation 8 homexpert tm by Hone ywell THR840DUK Digital Thermostat 9 On/off switc h and frost pr otection Press the ON/OFF button as shown at left to turn the thermostat on or off. When of f, the thermostat will never activate the cooling system, and will activate heating only if necessary to maintain a minimum indoor temperature of 5º C (fr ost [...]

  • Page 6

    Operation 10 homexpert tm by Hone ywell THR840DUK Digital Thermostat 11 T emperature contr ol When idle, the thermostat displays the current r oom temperature. Y ou can press the p or q buttons at any time to see the “target” temperature the thermostat is trying to maintain. One button press will display the target temperatur e, flashing. T o [...]

  • Page 7

    Installation and Setup 12 homexpert tm by Hone ywell THR840DUK Digital Thermostat 13 System installation W all bracket installation NO TE: If you are not experienced in equipment installation, we recommend that these procedures be done by a prof essional installer. DISCONNECT ELECTRIC PO WER BEFORE INST ALLA TION: Can cause electrical shock or equi[...]

  • Page 8

    Installation and Setup 14 homexpert tm by Hone ywell THR840DUK Digital Thermostat 15 Connect system wiring 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 wir e. 3 Use a scre[...]

  • Page 9

    Installation and Setup 16 homexpert tm by Hone ywell THR840DUK Digital Thermostat 17 Wiring diagrams Thermal actuator Zone valve L N Wiring diagrams Zone valve (drive open, drive closed) Electric resistance heater[...]

  • Page 10

    Installation and Setup 18 homexpert tm by Hone ywell THR840DUK Digital Thermostat 19 Activate batteries and mount thermostat Remove the thermostat cover (see page 13). Discard the plastic tab inside to activate the batteries, then replace batteries. The thermostat should display the current r oom temperature. Replace the thermostat front cover , th[...]

  • Page 11

    Installation and Setup 20 homexpert tm by Hone ywell THR840DUK Digital Thermostat 21 Installer setup Installer settings allow you to customise how your system works. Check the tables on pages 21-23 to see if any settings need to be changed. T o change installer settings: 1 Press and hold the ON/OFF button for 5 seconds. 2 Press and hold the p and q[...]

  • Page 12

    Installation and Setup 22 homexpert tm by Hone ywell THR840DUK Digital Thermostat 23 Installer setup functions Function Description Setting Options 7: ES ECO default temperatur e 18°C ** Options: 5° to 35°C 8: HC Heating/Cooling options 0: No central cooling system installed ** 1: Allows switching between heating and cooling systems Thermostat c[...]

  • Page 13

    Installation and Setup 24 homexpert tm by Hone ywell THR840DUK Digital Thermostat 25 Description of functions Ot Minimum boiler off time : Check proper setting for your system (see page 23). Cr Cycles per hour : Check proper setting for your system (see page 23). Ot Proportional band width : If your heating system is oversized for your home, you ca[...]

  • Page 14

    Appendix 26 homexpert tm by Hone ywell THR840DUK Digital Thermostat 27 Limited W arranty Honeywell warrants this product for 1 year fr om date of purchase. We undertake to replace or repair at our discr etion, products should they become defective within 1 year solely as a result of faulty materials and or workmanship. Understandably if the product[...]

  • Page 15

    Honeywell The Arnold Centre Paycocke Road Basildon, Essex SS14 3EA T echnical Help Desk: 0845 604 2893 50051982-001 Rev . A www .homexpertbyhoneywell.com © 2010 Honeywell International Inc Need Help? For assistance with this product please visit www .homexpertbyhoneywell.com , or call Honeywell Customer Care at 0845 604 2893. ®[...]