Honeywell Thermostat THR840DUK- Manuals

Page 2 - About your new thermostat; QUICK START GUIDE; Operation; Contents; your new thermostat right away.

homexpert tm by Honeywell THR840DUK Digital Thermostat 3 About your new thermostat What is a room thermostat? ..................4-5 QUICK START GUIDE ............................. 6 Quick reference to controls ....................... 7 Operation On/off switch ...........................................

Page 3 - What is a room thermostat?

User Manual 4 homexpert tm by Honeywell THR840DUK Digital Thermostat 5 ...an explanation for householders A room thermostat simply switches the heating system on and off as necessary. It works by sensing the air temperature, switching on the heating when the air temperature falls below the thermosta...

Page 4 - Install and set up thermostat; eco

User Manual 6 homexpert tm by Honeywell THR840DUK Digital Thermostat 7 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 ...

Page 5 - On/off switch and frost protection; Press the; Heating or cooling control; To switch between heating and cooling, press and hold the

Operation 8 homexpert tm by Honeywell THR840DUK Digital Thermostat 9 On/off switch and frost protection 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 ...

Page 6 - Temperature control; Energy-saving ECO mode; ECO

Operation 10 homexpert tm by Honeywell THR840DUK Digital Thermostat 11 Temperature control When idle, the thermostat displays the current room temperature. You 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...

Page 7 - System installation; Installation procedure; OK; • Do not install near sources of hot or cold air (radiators,

Installation and Setup 12 homexpert tm by Honeywell THR840DUK Digital Thermostat 13 System installation Wall bracket installation NOTE: If you are not experienced in equipment installation, we recommend that these procedures be done by a professional installer. DISCONNECT ELECTRIC POWER BEFORE INSTA...

Page 8 - Connect system wiring; Make sure electrical power is off; Strip insulation to expose about 6 mm of; Wiring diagrams; Basic boiler

Installation and Setup 14 homexpert tm by Honeywell 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...

Page 9 - Thermal actuator

Installation and Setup 16 homexpert tm by Honeywell 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 - Activate batteries and mount thermostat; System test; Check the power supply to make sure the heating system is on.

Installation and Setup 18 homexpert tm by Honeywell 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 room temp...

Page 11 - Installer setup; To change installer settings:; Installer setup functions; Function; See page 23 for important information

Installation and Setup 20 homexpert tm by Honeywell 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. To change installer settings: 1 Press and hold the ON/OFF bu...

Page 12 - Thermostat cannot control cooling unless you select 1; Customised settings for your system

Installation and Setup 22 homexpert tm by Honeywell THR840DUK Digital Thermostat 23 Installer setup functions Function Description Setting Options 7: ES ECO default temperature 18°C ** Options: 5° to 35°C 8: HC Heating/Cooling options 0: No central cooling system installed ** 1: Allows switching bet...

Page 13 - Description of functions; • Make sure heating or cooling system has power. Check fuses and

Installation and Setup 24 homexpert tm by Honeywell 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 ...

Page 14 - Limited Warranty; This does not affect your statutory rights.; by Honeywell; Disposal and recycling

Appendix 26 homexpert tm by Honeywell THR840DUK Digital Thermostat 27 Limited Warranty 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...

Page 15 - Honeywell; For assistance with this product please visit

Honeywell The Arnold CentrePaycocke RoadBasildon, EssexSS14 3EATechnical 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 Car...

Honeywell Thermostat THR840DUK- Manuals

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User Manual Honeywell Thermostat THR840DUK

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