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

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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.

The thermostat has an energy saving ECO button

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