Honeywell THR840DUK user manual Contents

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.

Copyright © 2010 Honeywell International Inc.

homexperttm by Honeywell is a trademark of Honeywell International Inc. All rights reserved.

Contents
About your new thermostat
What is a room thermostat?	4-5
QUICK START GUIDE	6
Quick reference to controls	7
Operation
On/off switch	8
Heating or cooling control	9
Temperature control	10
Energy-saving ECO mode	11
Installation and setup
System installation	12
Wall bracket installation	13
System wiring	14-17
Battery installation & mounting	18
System test	19
Installer setup	20-24

homexperttm by Honeywell THR840DUK Digital Thermostat

Appendix
In case of difficulty	25
Warranty information	26
Disposal & recycling	27

NOTE: This 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.

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