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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 the target temperature, flashing. To
change it, press either button repeatedly, until the display shows
the temperature you want. After a few seconds the display will stop
flashing and change to show the current room temperature.
NOTE: You can use the ECO mode to temporarily override the target
temperature for a specified period of time (see page 11).
24.0
°
c
25.0
°
c
Current room temperature
Press buttons to display or change target
temperature
Energy-saving ECO mode
The ECO mode overrides thermostat settings to maintain a different
temperature for 1 to 24 hours. This can be useful to reduce heating or
cooling costs when you are away from home.
1 Press the green ECO button to display timer.
2 Press the p or q buttons to set timer (1-24 hours).
While in ECO mode, the screen will alternately display remaining time
and current room temperature. After the timer expires, the thermostat
will resume normal operation. Options:
• Pressthep or q buttons to raise or lower the temporary ECO
temperature if needed.
• PresstheECO button again to cancel ECO mode and resume
normal operation.
Press to enter ECO mode
NOTE: The default ECO temperature is pre-set to 18º C. To raise or
lower the default temperature, see page 22.
1hr
3hr
eco
eco
18.0
°
c
eco
Set number of hours
Change ECO temperature (if needed)
6


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