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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 a minimum
indoor temperature of 5º C (frost protection).
You can change the frost protection temperature to any level between
5º and 16º C, or turn this feature off so the heating system is never
activated when the thermostat is off (see page 22).
25.0
°
c
5.0
°
c
Press and hold
to turn on or off
Symbol appears when
thermostat is off
System maintains
minimum
temperature when
thermostat is off
Heating or cooling control
The thermostat is pre-set to control only your heating system. If
installed and set up correctly, it can also be used to control your
cooling system.
To switch between heating and cooling, press and hold the p and q
buttons together until the screen changes.
Press and hold both buttons for 5 seconds
NOTE: The thermostat will not switch to cooling control unless you
enable this feature (see page 22).
NOTE: When you change the system, the “Heating” and “Cooling”
symbols will appear for a few seconds, then disappear. Normally, these
symbols appear only when the heating or cooling system is running.
Heating changes to cooling
25.0
°
c
25.0
°
c
5


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