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