Honeywell THR840DUK - Manuals

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 ...

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...

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...

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...

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

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...

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...

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...

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 ...

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...

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