Honeywell DT90E Operating instructions

*
The purpose of this device is to control the temperature
of the HEATING when the timer allows it to be switched
on.
The hot water will not be affected in any way.
Normal operation of the thermostat
Normal Display
The display will normally show the room temperature
measured by the thermostat.
If the flame symbol is visible*, this means that the boiler
should be on.
To enquire about the set temperature
Simply press one of the arrow buttons and the display
will show the set temperature. After a few seconds it
will go back to showing the room temperature.
To change the set temperature
Keep pressing the arrow buttons and the display will
change to show the new set temperature.
Press the Sbutton to increase the temperature, and
the ▼button to decrease the temperature.
To switch on or off
Press and hold the button marked
for 2 seconds to switch off.
In the bottom right corner display will show this symbol.
To switch the thermostat back on, press and hold the
same button again for 2 seconds. The symbol in the
bottom right hand corner will disappear.
50029850-002
GUIDE TO THE USE OF THE DT90E ROOM THERMOSTAT
Honeywell
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This allows the temperature to be set to a lower value
for several hours, to save energy.
The energy saving temperature has normally been
pre-set to 18°C.
How to operate the ECO energy saving
To start the energy saving
Press the green ECO button.
Set the number of hours at this energy saving
temperature.
To set the number of hours
Simply press the Sor ▼buttons to increase or
decrease the number of hours (from 1 to 24 hours).
Display during the ECO time period
The display shows the word ‘ECO’.
It also alternates between showing the time remaining
in ECO mode, with an egg timer, and the measured
room temperature.
To switch off the ECO energy saving mode
Press the green ECO button again.
‘ECO’ will disappear from the display and the
thermostat will now control at the normal temperature.
Copyright@Honeywell
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